SC1894A-00M13 [MAXIM]
225MHz to 3800MHz RF Power Amplifier Linearizer;
| 型号： | SC1894A-00M13 |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | 225MHz to 3800MHz RF Power Amplifier Linearizer |
| 文件： | 总18页 (文件大小：1919K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
SC1894
225MHz to 3800MHz RF Power
Amplifier Linearizer (RFPAL)
General Description
Features
®
The SC1894 is the Scintera 3rd generation of RF PA lin-
earizers (RFPAL™) that provide improved correction and
functionality over the previous generations. The SC1894
is a fully adaptive, RFin/RFout predistortion linearization
solution optimized for a wide range of amplifiers, power
levels, and communication protocols. The SC1894 uses
the PA output and input signals to adaptively generate
an optimized correction function in order to minimize the
PA’s self-generated distortion and impairments. Using
RF-domain analog signal processing enables the SC1894
to operate over wide-signal bandwidths and consume
very low power.
● RFin/RFout PA Linearizer SoC in Standard CMOS
• Fully Adaptive Correction
• Up to 28dB ACLR and 38dB IMD Improvement
*
● External Reference Clock Support:
• 10, 13, 15.36, 19.2, 20, 26, and 30.72MHz
● Low Power Consumption:
• Duty-Cycled (9%) Feedback: 600mW
• Full Adaptation: 1200mW
● Frequency Range: 225MHz to 3800MHz
● Input Signal Bandwidth: 1.2MHz to 75MHz
● Packaged in 9mm x 9mm QFN Package
● Operating Case Temperature: -40°C to +105°C
● Fully RoHS Compliant, Green Materials
● Dual-RF Power Measurement
The SC1894 goes beyond linearization and provides
accurate RF power measurement of RFIN and RFFB.
Design support features including spectral monitoring
and ACLR alarm are also available. These design sup-
port features are accessed through the SC1894’s serial
peripheral interface (SPI) bus.
Benefits
● Ease of Use
Applications
● Cellular Infrastructure (SC1894A-00C13)
• Integrated RFin/RFout Solution
• Reduced FW Development
• Single/Multicarrier, Multistandard: CDMA/EVDO,
● Reduces System Power Consumption and OPEX
®
TD-SCDMA, WiMAX , WCDMA/HSDPA, LTE, and
● Reduces BOM Costs, Area, and Total Volume
• Smaller Power Supply, Heat Sink, and Enclosure
• Eliminates Microcontroller and Power Detectors
TD-LTE
• BTS Amplifiers, RRH, Booster Amplifiers,
Repeaters, Small Cells, Microcells, Picocells,
DAS, AAS, and MIMO Systems
2
• Small Implementation Size (< 6.5cm )
● Field-Proven, Carrier Class Reliability
● Microwave Backhaul (SC1894A-00M13)
• BPSK, QPSK, Up to 1024-QAM
• IF-to-RF Outdoor Unit (ODU)
• Support for Adaptive Coding and Modulation
(ACM) and Automatic Transmit Power Control
(ATPC) Up to 100dB/s
Ordering Information and Application Block Diagram
appears at end of data sheet.
● Broadcast Infrastructure (SC1894A-00C13)
• UHF Digital Broadcast
• DVB-T/H/T2, CMMB, ISDB-T and ATSC
• Other Applications: Digital Terrestrial UHF
Amplifiers, Exciters, Drivers and Transmitters
● Wide Range of PAs and Output Power
• Amplifier: Class A/AB and Doherty
• PA Process: LDMOS, GaN, GaAs, and InGaP
• Average PA Output Power Examples:
Cellular Infrastructure: Up to 49dBm
*Performance dependent on amplifier, bias, and waveform.
Terrestrial Broadcast: Up to 60dBm
● Any Application Requiring PA Linearization
19-6957; Rev 1; 7/20
SC1894
225MHz to 3800MHz RF Power
Amplifier Linearizer (RFPAL)
from the +25°C performance uses the performance of a
given device and waveform type as the reference. This
error is largely dominated by output variations associated
with temperature.
Detailed Description
Introduction to Predistortion Using the SC1894
Wideband signals in today’s telecommunications systems
have high peak-to-average ratios and stringent spectral
regrowth specifications. These specifications place high
linearity demands on power amplifiers. Linearity may
be achieved by backing off output power at the price of
reducing efficiency. However, this increases the compo-
nent and operating costs of the power amplifier. Better
linearity may be achieved through the use of digital pre-
distortion and other linearization techniques, but many of
these are time consuming and costly to implement.
The PMU codes are represented as 16-bit signed integer
and are converted to dBm (referenced to the balun input)
using the following formula:
For RFIN:
RFIN PMU (CODE)× 3.01
P[Balun](dBm) =
1024
+ OFFSET
(dBm)
RFIN
Wireless service providers are deploying networks with
wider coverage, greater subscriber density, and higher
data rates. These networks require more efficient power
amplifiers. Additionally, the emergence of distributed
architectures and active antenna systems is driving the
need for smaller and more efficient power amplifier imple-
mentations. Further, there continues to be a strong push
toward reducing the total capital and operating costs of
base stations.
For RFFB:
P[Balun](dBm) =
RFFB PMU (CODE)× 3.01
1024
+ OFFSET
(dBm)
RFFB
The OFFSET
and OFFSET
are dependent on
RFFB
RFIN
end-system characteristics and also on the part-to-part
variation of the RFPAL. For absolute accuracy, the PMU
calibration procedure outlined in the release notes and
SPI programming guide must be followed.
With the SC1894, the complex signal processing is done
in the RF domain. This results in a simple system-on-chip
that offers wide signal bandwidth, broad frequency of
operation, and very low power consumption. It is an ele-
gant solution that reduces development costs and speeds
time to market. Applicable across a broad range of signals
— including 2G, 3G, 4G wireless, and other modulation
types — the powerful analog signal-processing engine
is capable of linearizing the most efficient power ampli-
fier topologies. The SC1894 is a true RFin and RFout
solution, supporting modular power amplifier designs
that are independent of the baseband and transceiver
subsystems. The SC1894 delivers the required efficiency
and performance demanded by today’s wireless systems.
Measurement Considerations
In order to provide sufficient integration samples to allow
precise measurements of signals, the default integration
time (measurement window) is fixed to 40ms. Note that if
the measurement window is not a multiple of the system
frame length, then the power-measurement window will
span an incomplete frame and cause a measurement
error. However; the synchronization of the frame and
measurement window is not required to achieve precise
measurements.
TDD Considerations—Operation with < 100%
PA Duty Cycle
RF Power Management Unit (PMU)
Description
The PMU fully supports accurate measurement of TDD
waveforms. The PMU does not differentiate between
samples taken when the PA is on versus when the PA is
off. Though easily compensated, this condition will affect
the reading for waveforms with less than 100% duty cycle
(e.g., TDD applications). For example, the PMU value
read for a 50% duty-cycle waveform will be 3dB lower
than the value for the same signal but with a 100% duty
cycle. Calculating the offset associated with TDD mea-
surements is straightforward and may be handled by the
PMU depending on the system requirements. Refer to the
Release Notes for additional details on different methods.
Analysis
The RFIN and RFFB log slope and intercept are derived
using a linear regression performed on data collected
under nominal operating conditions. The error from linear
response to the CW waveform is the dB difference in out-
put from the ideal output. This is a measure of the linearity
of the device response to both CW and modulated wave-
forms. Error from the linear response to the CW waveform
is a measure of relative accuracy because the system has
yet to be calibrated. However, it verifies the linearity and
the effect of modulation on the device response. Error
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SC1894
225MHz to 3800MHz RF Power
Amplifier Linearizer (RFPAL)
Application Block Diagram
VDD
ANTENNA
NO DELAY TO 6NS
DELAY
CORRECTION
COUPLER
FEEDBACK COUPLER
INPUT COUPLER
CIRCULATOR / FILTER /
PA
RFIN
DUPLEXER
CPLIN
CPLOUT
RFOUT
SC1894
RECEIVER
RFINP
RFOUTP
RFOUTN
BALUN
RFINN
BALUN
EXT. CLOCK
XTALI
XTALO
RFFBP
RFFBN
RFFB
BALUN
ATTENUATOR
OPTIONAL CRYSTAL
1.8V
3.3V
DI/O
SPI
REGULATOR
SERIAL INTERFACE
OPTIONAL DIGITAL
I/OS
SUPPLY
Microwave Block Diagram
ANTENNA
UP
FEEDBACK COUPLER
CONVERT
CORRECTION
COUPLER
INPUT COUPLER
RFIN
RFOUT
DELAY
(0 – 4NS)
FILTER/DUPLEXER
IF INPUT
225MHz–3.8GHz
CPLOUT
PA
CPLIN
RFPAL
LO
TO RECEIVER
RFINP
RFINN
RFOUTP
BALUN
BALUN
BALUN
RFOUTN
XTALI
RFFBP
RFFBN
ATTENUATOR
CRYSTAL
RFFB
XTALO
1.8V
OSCILLATOR
3.3V
SPI
DOWN CONVERT
REGULATOR
SUPPLY
SERIAL INTERFACE
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SC1894
225MHz to 3800MHz RF Power
Amplifier Linearizer (RFPAL)
Absolute Maximum Ratings
Supply Voltage (VDD33 to GND).........................-0.3V to +3.8V
Supply Voltage (VDD18 to GND).........................-0.2V to +2.2V
Input Voltage (1.8V pins)........................-0.2V to VDD18 + 0.2V
Input Voltage (3.3V pins)........................-0.3V to VDD33 + 0.3V
Input into the BALUN (RMS)............................................+7dBm
Junction Temperature......................................................+150°C
Storage Temperature........................................ -65°C to +150°C
Operating Rating
Operating Case Temperature……………………-40°C to +105°C
Warning: Any stress beyond the ranges indicated may damage the device permanently. The specified stress ratings do not imply functional performance in these ranges. Exposure of the device
to the absolute maximum ratings for extended periods of time is likely to degrade the reliability of this product.
DC Characteristics
PARAMETER
MIN
3.1
TYP
3.3
MAX
3.5
UNITS
V
Supply Voltage (VDD33 to GND)
Supply Voltage (VDD18 to GND)
1.7
1.8
1.9
V
Supply Peak Current (VDD33 to GND) (Notes 1, 2, 3, 4)
100
840
1200
600
120
900
1400
mA
mA
mW
mW
Supply Peak Current (VDD18 to GND) (Notes 1, 2, 3, 4)
Average Power Dissipation: Full-Scale Adaptation, Track and AF (Notes 2, 3, 4)
Average Power Dissipation: Duty-Cycled Feedback (Notes 2, 4, 5)
Note 1: Peak current includes supply decoupling network. Refer to Hardware Design Guide for proper sizing of the on-board
regulators.
Note 2: Characterized at typical voltages, +25°C operating case temperature, and 20MHz input signal BW.
Note 3: Continuous adaptation, tracking (100% duty-cycled feedback).
Note 4: Power dissipation may be FW dependent. Refer to the FW release notes for any changes to values listed above.
Note 5: Duty-cycled feedback power dissipation averaged over ON time of 100ms (9%), OFF time of 1.0s (91%).
Radio Frequency Signals
Operation at +25°C, AVDD18 = 1.8V, AVDD33 = 3.3V, DVDD18 = 1.8V, and 20MHz external clock, unless otherwise specified.
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Operating Frequency (Note 6)
f
225
3800
MHz
75
(Note 8)
Input Signal Bandwidth (Note 7)
Noise Power (Note 9)
BW
1.2
MHz
dBm/Hz
dBm
signal
Referred to 0dBm at PA input
-140
-76
-137
-69
In-Band CW Spurious Power
(Notes 9, 10)
698MHz–960MHz, at RFOUT balun
single ended port
P
spurLF
In-Band CW Spurious Power
(Notes 9, 10)
1800MHz–2200MHz, at RFOUT balun
single ended port
P
-69
-53
-62
-41
dBm
dBm
spurMF
In-Band CW Spurious Power
(Notes 9, 10)
2400MHz–2700MHz, at RFOUT balun
single ended port
P
spurHF
Note 6: See Operating Frequency Ranges table for frequency limits of each defined band.
Note 7: In the case where 40MHz < BW ≤ 75MHz and the carrier configuration is NON-fully occupied, then the average
signal
power delta between the two outermost carriers must be ≤ 20dB, the carrier configuration must be static (no hopping), the
outermost carriers must be ≥ 5MHz and the f must be stored in EEPROM.
C
Note 8: Correction performance across range of input signal BWs also depends on PA output power and carrier configuration.
Note 9: Worst case over supply voltage and temperature range, guaranteed by characterization.
Note 10: Spurious content is typically due to RFPAL receiver LO leakage and is located within 1MHz of the occupied signal center
frequency.
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SC1894
225MHz to 3800MHz RF Power
Amplifier Linearizer (RFPAL)
RF Input Range for Maximum Correction—225MHz to 470MHz
Operation at +25°C, AVDD18 = 1.8V, AVDD33 = 3.3V, DVDD18 = 1.8V, and 20MHz external clock, unless otherwise specified.
PARAMETER
SYMBOL
CONDITIONS
MIN
-6
TYP
0
MAX
+2
UNITS
dBm
dBm
dBm
dBm
dBm
dBm
Peak RFIN_BLN (Notes 11, 13)
Peak RFFB_BLN (Notes 11, 13)
RMS RFIN_BLN (Notes 12, 13)
RMS RFFB_BLN (Notes 12, 13)
RFIN_BLN Operating Range
RFFB_BLN Operating Range
P
RFIN_BLN_P
P
-16
-13
-23
-48
-56
-8
-6
RFFB_BLN_P
When PA operates at maximum
power
P
-10
-18
-8
RFIN_BLN
P
-16
-8
RFFB_BLN
P
RFIN_BLN
RMS power, over PA output
power range
P
-16
RFFB_BLN
RF Input Range for Maximum Correction—470MHz to 700MHz
Operation at +25°C, AVDD18 = 1.8V, AVDD33 = 3.3V, DVDD18 = 1.8V, and 20MHz external clock, unless otherwise specified.
PARAMETER
SYMBOL
CONDITIONS
MIN
-6
TYP
0
MAX
+2
UNITS
dBm
dBm
dBm
dBm
dBm
dBm
Peak RFIN_BLN (Note 11, 13)
Peak RFFB_BLN (Note 11, 13)
RMS RFIN_BLN (Note 12, 13)
RMS RFFB_BLN (Note 12, 13)
RFIN_BLN Operating Range
RFFB_BLN Operating Range
P
RFIN_BLN_P
P
-16
-13
-23
-48
-56
-8
-6
RFFB_BLN_P
When PA operates at maximum
power
P
-10
-18
-8
RFIN_BLN
P
-16
-8
RFFB_BLN
P
RFIN_BLN
RMS power, over PA output power
range
P
-16
RFFB_BLN
RF Input Range for Maximum Correction—700MHz to 2700MHz
Operation at +25°C, AVDD18 = 1.8V, AVDD33 = 3.3V, DVDD18 = 1.8V, and 20MHz external clock, unless otherwise specified.
PARAMETER
SYMBOL
CONDITIONS
MIN
-2
TYP
+4
MAX
+6
UNITS
dBm
dBm
dBm
dBm
dBm
dBm
Peak RFIN_BLN (Note 11, 13)
Peak RFFB_BLN (Note 11, 13)
RMS RFIN_BLN (Note 12, 13)
RMS RFFB_BLN (Note 12, 13)
RFIN_BLN Operating Range
RFFB_BLN Operating Range
P
RFIN_BLN_P
P
-12
-9
-4
-2
RFFB_BLN_P
When PA operates at maximum
power
P
-6
-4
RFIN_BLN
P
-19
-49
-52
-14
-12
-4
RFFB_BLN
P
RFIN_BLN
RMS power, over PA output power
range
P
-12
RFFB_BLN
RF Input Range for Maximum Correction—2700MHz to 3300MHz
Operation at +25°C, AVDD18 = 1.8V, AVDD33 = 3.3V, DVDD18 = 1.8V, and 20MHz external clock, unless otherwise specified.
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
+6
MAX
UNITS
dBm
dBm
dBm
dBm
dBm
dBm
Peak RFIN_BLN (Note 11, 13)
Peak RFFB_BLN (Note 11, 13)
RMS RFIN_BLN (Note 12, 13)
RMS RFFB_BLN (Note 12, 13)
RFIN_BLN Operating Range
RFFB_BLN Operating Range
P
RFIN_BLN_P
P
-4
RFFB_BLN_P
When PA operates at maximum
power
P
-4
RFIN_BLN
P
-14
RFFB_BLN
P
-44
-54
-4
RFIN_BLN
RMS power, over PA output power
range
P
-14
RFFB_BLN
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SC1894
225MHz to 3800MHz RF Power
Amplifier Linearizer (RFPAL)
RF Input Range for Maximum Correction—3300MHz to 3800MHz
Operation at +25°C, AVDD18 = 1.8V, AVDD33 = 3.3V, DVDD18 = 1.8V, and 20MHz external clock, unless otherwise specified.
PARAMETER
SYMBOL
CONDITIONS
MIN
+3
TYP
+9
MAX
+11
-2
UNITS
dBm
dBm
dBm
dBm
dBm
dBm
Peak RFIN_BLN (Note 11, 13)
Peak RFFB_BLN (Note 11, 13)
RMS RFIN_BLN (Note 12, 13)
RMS RFFB_BLN (Note 12, 13)
RFIN_BLN Operating Range
RFFB_BLN Operating Range
P
RFIN_BLN_P
P
-12
-4
-4
RFFB_BLN_P
When PA operates at maximum
power
P
-1
+1
RFIN_BLN
P
-19
-41
-52
-14
-12
+1
RFFB_BLN
P
RFIN_BLN
RMS power, over PA output power
range
P
-12
RFFB_BLN
-4
Note 11: Peak power is defined as the 10 point on the CCDF (complementary cumulative distribution function) of the signal.
Note 12: Power (MAX RMS) + PAR must not exceed the peak power limits specified above, there is no maximum limit on the PAR.
Note 13: Referred to 50Ω impedance into a 1:2 balun.
Operating Frequency Ranges
FREQUENCY RANGE (Note 14)
225MHz to 520MHz
RECOMMENDED APPLICATIONS
DESIGNATION
TV white space
-02
-03
225MHz to 960MHz
UHF broadcast, TV White Space, public safety
Low-band cellular (698MHz to 960MHz), UHF broadcast,
TV white space, public safety
520MHz to 1040MHz
-04
1040MHz to 2080MHz
698MHz to 2700MHz
LTE for Japan (1400MHz to 1510MHz)
-05
-06
-07
-08
-09
Low- and high-band cellular, IF for SATCOMM (950MHz to 145MHz)
High-band cellular (1800MHz to 2700MHz)
1800MHz to 2700MHz (DEFAULT)
2700MHz to 3500MHz
3300MHz to 3800MHz
Microwave (IF), WiMAX, LTE
Note 14: Default is -07. User may reprogram for other ranges listed above. Refer to SPI Programming Guide for programming
information.
Digital I/O—DC Characteristics
Guaranteed performance across worst-case supply voltage and temperature range, unless otherwise specified.
PARAMETER
SYMBOL
CONDITIONS
MIN
-0.3
2.0
TYP
MAX
UNITS
CMOS Input Logic-Low
CMOS Input Logic-High
CMOS Output Logic-Low
CMOS Output Logic-High
SDO CMOS Output Current
STATO CMOS Output Current
V
+0.8
V
V
IL
V
VDD = 3.3V
IH
V
0.4
V
OL
V
VDD = 3.3V
Three-state
Open drain
2.4
V
OH
I
I
/I
-16.0
-16.0
+16.0
0.0
mA
mA
OL OH
/I
OL OH
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SC1894
225MHz to 3800MHz RF Power
Amplifier Linearizer (RFPAL)
Digital I/O—External Clock (XTALI)
Guaranteed performance across worst-case supply voltage and temperature range, unless otherwise specified.
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
User Programmable External
Clock (Notes 15, 16)
f
10
20
30.72
MHz
CLK
External Clock Frequency
Accuracy
1
%
External Clock Frequency Drift
Duty Cycle
Including aging and temperature
Square wave
100
55
ppm
%
45
External Clock Amplitude
External Clock Phase Noise
V
Sine or square wave
At 100kHz offset
500
1500
-130
mV
p-p
CLK
PN
dBc/Hz
CLK
Note 15: Selecting an external reference clock frequency other than 20MHz requires programming the SC1894 through the SPI bus.
See SPI Programming Guide and HW Design Guide for more information.
Note 16: User may program the SC1894 to accept the following clock frequencies: 10, 13, 15.36, 19.2, 20, 26 and 30.72MHz.
Crystal Requirements
Guaranteed performance across worst-case supply voltage and temperature range, unless otherwise specified.
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
50
UNITS
Ω
ESR
Capacitive Load to Ground
Frequency Accuracy
Frequency Drift
10
12
pF
250
100
ppm
ppm
Including aging and temperature
Serial Peripheral Interface (SPI) Bus Specifications
Guaranteed performance across worst-case supply voltage and temperature range unless otherwise specified.
PARAMETER
Select Setup Time
SYMBOL
CONDITIONS
MIN
100
250
100
25
TYP
MAX
UNITS
ns
t
SS
Select Hold Time
Select Disable Time
Data Setup Time
Data Hold Time
Rise Time
t
ns
SH
t
ns
DIS
t
ns
DS
t
45
ns
DH
t
25
25
ns
R
Fall Time
t
ns
F
Clock Period
t
250
100
ns
CP
CH
OV
OD
Clock High Time
Time to Output Valid
Output Data Disable
t
t
ns
100
0
ns
t
ns
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SC1894
225MHz to 3800MHz RF Power
Amplifier Linearizer (RFPAL)
Timing Diagram
t
DIS
SSN
t
t
CH
CP
t
SS
t
t
t
SH
R
F
SCLK
SDI
t
DH
t
DS
t
t
OD
OV
SDO
IT IS REQUIRED THAT THE SPI BUS BE CONNECTED TO A HOST CONTROLLER IN ORDER TO READ OR WRITE CUSTOMER-ACCESSIBLE PARAMETERS.
EEPROM Endurance
PARAMETER
SYMBOL
CONDITIONS
Page mode, +25°C
MIN
TYP
MAX
UNITS
E/W
Cycles
EEPROM write/erase cycles
1M
RF Power Measurement Electrical Characteristics
RF Power Measurement Unit (PMU)
Operation at +25°C, AVDD18 = 1.8V, AVDD33 = 3.3V, and DVDD18 = 1.8V, unless otherwise specified. Min/Max values are at -40°C
< T < +105°C, unless otherwise noted.
case
PARAMETER
SYMBOL
fC
CONDITIONS (Notes 17, 18)
MIN
TYP
MAX
UNITS
Frequency Range (Note 19)
698
2500
MHz
range
-44
(Note 21)
RMS power, referred to 50Ω
RFIN_BLN Range (Note 20)
P
-4
dBm
dBm
RFINRange
impedance into a 1:2 balun
-34
(Note 22)
-52
(Note 21)
RMS power, referred to 50Ω
impedance into a 1:2 balun
RFFB_BLN Range (Note 20)
P
-12
RFFBRange
-42
(Note 22)
Linear regression between -4 and
-39dBm, 100 readings
RFIN_BLN Log Slope
RFFB_BLN Log Slope
µ
341.3
341.3
±1.2
LSB/dB
LSB/dB
LSB/dB
LSB/dB
RFINslope
Linear regression between -12 and
-47dBm, 100 readings
µ
RFFBslope
RFIN_BLN Log Slope
Variation
Linear regression between -4 and
-39dBm, 100 readings
σ
RFINslope
RFFB_BLN Log Slope
Variation
Linear regression between -12 and
-47dBm, 100 readings
σ
±1.2
RFFBslope
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SC1894
225MHz to 3800MHz RF Power
Amplifier Linearizer (RFPAL)
RF Power Measurement Electrical Characteristics (continued)
RF Power Measurement Unit (PMU) (continued)
Operation at +25°C, AVDD18 = 1.8V, AVDD33 = 3.3V, and DVDD18 = 1.8V, unless otherwise specified. Min/Max values are at -40°C
< T
< +105°C, unless otherwise noted.
case
PARAMETER
SYMBOL
CONDITIONS (Notes 23, 24)
MIN
TYP
MAX
UNITS
Linear regression between -4
and -34dBm
RFIN_BLN Log Intercept
RFFB_BLN Log Intercept
µ
0
dBm
RFINIntercept
Linear regression between -12
and -42dBm
µ
0
dBm
dB
RFFBIntercept
RFIN_BLN
Log Intercept Variation
Linear regression between -4 and
-34dBm, 100 readings of single IC
σ
±0.12
±0.12
RFINIntercept
RFFB_BLN
Log Intercept Variation
Linear regression between -12 and
-42dBm, 100 readings of single IC
σ
dB
RFFBIntercept
RFIN_BLN Error as Referred
to Best-Fit Line (Notes 25, 26)
-4 to -34dBm
-34 to -44dBm
-0.30
-2
+0.30
+2
dB
dB
P
RFIN_
FITERROR
RFFB_BLN Error as Referred
to Best-Fit Line (Notes 25, 26)
-12 to -42dBm
-42 to -52dBm
-0.30
-2
+0.30
+2
dB
dB
P
RFFB_
FITERROR
RFIN_BLN, RFFB_BLN
Deviation from 2-Tone CW
Response (Note 27)
6.5 dB PAR (WCDMA 1 carrier)
10 dB PAR (WCDMA 1 carrier)
10 dB PAR (LTE 20 carrier)
±0.1
±0.1
±0.1
dB
dB
dB
Deviation from output at 25°C, −40°C
< T
< +105°C,
case
RFIN_BLN Deviation vs.
Temperature (Notes 25, 27)
-4 to -34dBm, at 1800MHz
-34 to -44dBm, at 1800MHz
-0.55
-2
±0.1
±0.5
+0.55
+2
dB
dB
P
RFINTEMP_
DEV
-4 to -34dBm, at 2500MHz
-34 to -44dBm, at 2500MHz
-0.7
-2
±0.1
±0.5
+0.7
+2
dB
dB
Deviation from output at +25°C,
−40°C < T
< +105°C,
case
RFFB_BLN Deviation vs.
Temperature (Notes 25, 27)
-12 to -42dBm, at 1800MHz
-42 to -52dBm, at 1800MHz
-0.4
-2
±0.1
±0.5
+0.4
+2
dB
dB
P
RFFBTEMP_
DEV
-12 to -42dBm, at 2500MHz
-42 to -52dBm, at 2500MHz
-0.5
-2
±0.1
±0.5
+0.5
+2
dB
dB
P
RFINVDD18
_DEV
RFINVDD33
_DEV
RFIN_BLN Deviation vs.
Supply Voltage
1.7V < AVDD18 < 1.9V
3.1V < AVDD33 < 3.5V
+0.7
-0.5
dB/V
dB/V
P
P
P
RFFBVDD18
_DEV
RFFBVDD33
_DEV
RFFB_BLN Deviation vs.
Supply Voltage
1.7V < AVDD18 < 1.9V
3.1V < AVDD33 < 3.5V
+0.7
-0.5
dB/V
dB/V
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SC1894
225MHz to 3800MHz RF Power
Amplifier Linearizer (RFPAL)
RF Power Measurement Electrical Characteristics (continued)
RF Power Measurement Unit (PMU) (continued)
Operation at +25°C, AVDD18 = 1.8V, AVDD33 = 3.3V, and DVDD18 = 1.8V, unless otherwise specified. Min/Max values are at -40°C
< T
< +105°C, unless otherwise noted.
case
PARAMETER
SYMBOL
CONDITIONS (Notes 23, 24)
MIN
TYP
MAX
UNITS
(RFIN_BLN) - (RFFB_BLN)
Log Slope
µ
0
LSB/dB
RFIN-RFFBslope
(RFIN_BLN) - (RFFB_BLN)
Log Slope Variation
σ
RFIN-
RFFBslope
±1.2
LSB/dB
RFIN_BLN range
(RFFN_BLN = RFIN_BLN – 7dB)
-4 to -24dBm
(RFIN_BLN) - (RFFB_BLN)
Error as Referred to Best-Fit
Line (Note 26)
-0.30
-2
+0.30
+2
dB
dB
-24 to -34dBm
(RFIN_BLN) - (RFFB_BLN)
Deviation from 2-Tone CW
Response (Note 27)
6.5dB PAR (WCDMA 1 carrier)
10dB PAR (WCDMA 1 carrier)
9.1dB PAR (WCDMA 12 carriers)
±0.1
±0.1
±0.1
dB
dB
dB
Deviation from output at 25°C, −40°C
(RFIN_BLN) - (RFFB_BLN)
Deviation vs. Temperature
(Note 27)
< T
< +105°C,
case
-4 to -24dBm, at 2200MHz
-24 to -34dBm, at 2200MHz
-0.55
-2
±0.1
±0.5
+0.55
+2
dB
dB
Note 17: Test conditions: 2-tone CW (3dB PAR), 5MHz bandwidth and centered at 2140 MHz unless otherwise specified.
Note 18: Power measurement updated about every 340ms. The integration time (measurement window) fixed to 40ms.
Note 19: For operation above 2500MHz, please contact factory.
Note 20: RMS power (MAX) + peak to average ratio (PAR) must not exceed the peak power limits specified in the respective IC
data sheets. As long as this condition is met, there is no limitation on the maximum PAR.
Note 21: When RFIN_BLN and RFFB_BLN are measured sequentially or independently.
Note 22: When RFIN_BLM and RFFB_BLN are measured simultaneously.
Note 23: Test conditions: 2-tone CW (3dB PAR), 5MHz bandwidth and centered at 2140MHz unless otherwise specified.
Note 24: Power measurement updated every 340ms. The integration time (measurement window) fixed to 40ms.
Note 25: When RFIN_BLN and RFFB_BLN are measured sequentially or independently.
Note 26: Guaranteed by test (at T
= +25°C) and characterization.
case
Note 27: Guaranteed by characterization.
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SC1894
225MHz to 3800MHz RF Power
Amplifier Linearizer (RFPAL)
Typical Operating Characteristics
Data presented in the figures on the following pages are based on typical operating conditions at +25°C, AVDD18 = 1.8V, AVDD33 =
3.3V, and DVDD18 = 1.8V, unless otherwise specified.
Measurements (PMU Error as Referred to Best-Fit Line)
Figure 1. RFIN_BLN PMU Error as referred to best-fit line vs.
RFIN RMS Power, frequency = 1800MHz
Figure 2. RFFB_BLN PMU Error as referred to best-fit line vs.
RFFB RMS Power, frequency = 1800MHz
Figure 3. RFIN_BLN PMU Error as referred to best-fit line vs.
RFIN RMS Power, frequency = 2500MHz
Figure 4. RFFB_BLN PMU Error as referred to best-fit line vs.
RFFB RMS Power, frequency = 2500MHz
Conditions:
Waveforms: WCDMA 2-carrier 6.5dB PAR and LTE 10MHz 7.5dB PAR
−40°C < T < +105°C
case
A/DVDD18 = 1.7V/1.9V, AVDD33 = 3.1V/3.5V
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SC1894
225MHz to 3800MHz RF Power
Amplifier Linearizer (RFPAL)
Typical Operating Characteristics (continued)
Data presented in the figures on the following pages are based on typical operating conditions at +25°C, AVDD18 = 1.8V, AVDD33 =
3.3V, and DVDD18 = 1.8V, unless otherwise specified.
Measurements (PMU Deviation from +25°C)
Figure 5. RFIN_BLN PMU deviation from +25°C vs. RFIN RMS
Power, frequency = 1800MHz
Figure 6. RFFB_BLN PMU deviation from +25°C vs. RFFB
RMS Power, frequency = 1800MHz
Figure 7. RFIN_BLN PMU deviation from +25°C vs. RFIN RMS
Power, frequency = 2500MHz
Figure 8. RFFB_BLN PMU deviation from +25°C vs. RFFB
RMS Power, frequency = 2500MHz
Conditions:
Waveforms: WCDMA-2 carrier 6.5dB PAR and LTE 10MHz 7.5dB PAR
−40°C < T < +105°C
case
A/DVDD18 = 1.7V/1.9V, AVDD33 = 3.1V/3.5V
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SC1894
225MHz to 3800MHz RF Power
Amplifier Linearizer (RFPAL)
Pin Configuration
TOP VIEW
64
63
62
61
60
59
58
57
56
55
54
53
52
51
50
49
DVDD18
1
2
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
DVDD18
AVDD18
MGPOUT0
MGPOUT1
AVDD18
AVDD33
GND
3
XTALO
4
XTALI
5
FLTCAP3N
FLTCAP3P
AVDD18
6
7
GND
RFOUTP
RFOUTN
GND
8
AVDD18
SC1894
9
FLTCAP2N
FLTCAP2P
FLTCAP1N
FLTCAP1P
AVDD18
10
AVDD18
11
12
13
14
15
16
AVDD18
MGPOUT2
MGPOUT3
AVDD18
65 - GNDPAD
FLTCAP0N
FLTCAP0P
GND
BGRES
17
18
20
22
24
25
27
29
31
32
19
21
23
26
28
30
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SC1894
225MHz to 3800MHz RF Power
Amplifier Linearizer (RFPAL)
Pin Description
PIN
1
NAME
DVDD18
MGPOUT0
MGPOUT1
AVDD18
AVDD33
GND
TYPE
Supply
FUNCTION
+1.8V DC Supply Voltage for digital circuits.
2
Analog Out
Analog Out
Supply
Do not connect. Reserved for internal use.
Do not connect. Reserved for internal use.
+1.8V DC Supply Voltage for analog circuits.
+3.3V DC Supply Voltage for analog circuits.
Ground.
3
4
5
Supply
6
Supply
7
GND
RF Shield
Ground for shield of RF signal.
8
RFOUTP
RFOUTN
GND
RF Output Signal, differential output. See S-parameters for complex
impedance values.
Analog Out
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
RF Shield
Supply
Ground for shield of RF signal.
AVDD18
AVDD18
MGPOUT2
MGPOUT3
GND
+1.8V DC Supply Voltage for analog circuits.
+1.8V DC Supply Voltage for analog circuits.
Do not connect. Reserved for internal use.
Do not connect. Reserved for internal use.
Ground.
Supply
Analog Out
Analog Out
Supply
BGRES
AVDD33
GND
Analog In
Supply
Bandgap Resistor.
+3.3V DC Supply Voltage for analog circuits.
Ground for shield of RF signal.
RF Shield
Analog In
Analog In
RF Shield
Supply
RFINP
RF Input Signal, differential input. See S-parameters for complex impedance
values.
RFINN
GND
Ground for shield of RF signal.
AVDD18
AVDD33
ADCIN0P
ADCIN0N
ADCIN1P
ADCIN1N
AVDD33
GND
+1.8V DC Supply Voltage for analog circuits.
+3.3V DC Supply Voltage for analog circuits.
Do not connect. Reserved for internal use.
Do not connect. Reserved for internal use.
Do not connect. Reserved for internal use.
Do not connect. Reserved for internal use.
+3.3V DC Supply Voltage for analog circuits.
Ground for shield of RF signal.
Supply
Analog In
Analog In
Analog In
Analog In
Supply
RF Shield
RFFBP
RF Feedback Signal, differential input. See S-parameters for complex
impedance values.
Analog In
RF Shield
Analog Out
RFFBN
GND
Ground for shield of RF signal.
FLTCAP0P
FLTCAP0N
AVDD18
AVDD18
Dedicated external filter capacitor #0.
Supply
Supply
+1.8V DC Supply Voltage for analog circuits.
+1.8V DC Supply Voltage for analog circuits.
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SC1894
225MHz to 3800MHz RF Power
Amplifier Linearizer (RFPAL)
Pin Description (continued)
PIN
37
38
39
40
41
42
43
44
NAME
TYPE
FUNCTION
FLTCAP1P
FLTCAP1N
FLTCAP2P
FLTCAP2N
AVDD18
Analog Out
Dedicated external filter capacitor #1.
Analog Out
Dedicated external filter capacitor #2.
Supply
Supply
+1.8V DC Supply Voltage for analog circuits.
+1.8V DC Supply Voltage for analog circuits.
AVDD18
FLTCAP3P
FLTCAP3N
Analog Out
Analog In
Dedicated external filter capacitor #3.
Crystal Input. For standard internal clock, connect crystal or ceramic resonator
from XTALI to XTALO. May alternatively be driven by an external clock.
45
XTALI
46
47
48
49
XTALO
AVDD18
DVDD18
RESETN
Analog Out
Supply
Crystal Output. Excitation driver for crystal or ceramic resonator.
+1.8V DC Supply Voltage for analog circuits.
Supply
+1.8V DC Supply Voltage for digital circuits.
Digital In
Reset when "Low". Has internal pull-up to DVDD33.
Watch Dog Timer Enable. WDTENB enabled when high. Has internal
pull-up to DVDD33. See applications schematic for further details.
50
WDTENB
Digital In
51
52
53
54
55
SCLK
SSN
Digital In
Digital In
Digital In
Digital Out
Supply
SPI clock. Has internal pull-down to GND.
SPI slave select enabled "Low". Has internal pull-up to DVDD33.
SPI slave data input to RFPAL. Has internal pull-down to GND.
SPI slave data output from RFPAL. Tri-state. DVDD33 logic.
+1.8V DC Supply Voltage for digital circuits.
SDI
SDO
DVDD18
Digital General Purpose Input 1. Has internal pull-up to DVDD33. See
Firmware Release Notes for further details.
56
57
DGPIN1
STATO
Digital In
General Purpose Status Output as defined in Firmware Release Notes.
Open-drain output with internal pull-up to DVDD33.
Digital Out
58
59
DVDD33
DVDD18
Supply
Supply
+3.3V DC Supply Voltage for digital circuits.
+1.8V DC Supply Voltage for digital circuits.
Load Enable. Required for FW upgrades. Has internal pull-down to GND.
See applications schematic for further details.
60
61
62
LOADENB
TESTSEL1
TESTSEL2
Digital In
Reserved
Reserved
Do not connect. Reserved for internal use.
Has internal pull-down to GND.
Do not connect. Reserved for internal use.
Has internal pull-down to GND.
Digital General Purpose Input 0. Do not connect. Reserved for future use.
Has internal pull-down to GND. See applications schematic for further details.
63
64
65
DGPIN0
DVDD18
GNDPAD
Digital In
Supply
Supply
+1.8V DC Supply Voltage for digital circuits.
Common Ground for entire integrated circuit. Also provides path for thermal
dissipation.
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SC1894
225MHz to 3800MHz RF Power
Amplifier Linearizer (RFPAL)
Top Mark
SCINTERA
SCINTERA
SC1894A-00
XXXXXXXXXX
WWYYRRRR
SC1894A-13
XXXXXXXXXX
WWYYRRRR
LINE
TOP MARK
DESCRIPTION
1
2
2
SCINTERA
SC1894
A
Company Name
Product Part Number
Product Revision
Product Configuration (PC):
-00 = All features enabled
-13 = All features enabled*
-00
-13
2
Assembly Lot Number
(up to 10 characters)
3
XXXXXXXXXX
4
4
4
WW
YY
Date Code - Work Week
Date Code - Year
Reserved
RRRR
*Recommended for new designs.
ESD
ESD (Electrostatic discharge) sensitive device. Although this product incorporates ESD protection circuitry, permanent damage may occur on
devices subjected to electrostatic discharges. Proper ESD precautions are recommended to avoid performance degradation or device failure.
Electrostatic Discharge (ESD) Protection Characteristics
TEST METHODOLOGY
CLASS
VOLTAGE
1000
UNIT
V
Human Body Model (per JESD22-A114)
Charge Device Model (per JESD22-C101)
1C
II
250
V
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SC1894
225MHz to 3800MHz RF Power
Amplifier Linearizer (RFPAL)
Ordering Information
PART NUMBER
Package Information
For the latest package outline information and land patterns
(footprints), go to www.maximintegrated.com/packages. Note
that a “+”, “#”, or “-” in the package code indicates RoHS status
only. Package drawings may show a different suffix character, but
the drawing pertains to the package regardless of RoHS status.
DESCRIPTION
IC, RFPAL, 225MHz–3800MHz,
FW4.1.05.01
SC1894A-00B00
SC1894A-00B13
SC1894A-00C13*
SC1894A-00M13*
IC, RFPAL, 225MHz–3800MHz,
FW4.1.05.01
PACKAGE
TYPE
PACKAGE
CODE
OUTLINE
NO.
LAND
PATTERN NO.
IC, RFPAL, 225MHz–3800MHz,
FW4.1.03.08 (for all other applications)
64 QFN
K6499MK+1B
21-0765
90-0605
IC, RFPAL, 225MHz–3800MHz,
FW4.1.07.00 (for microwave applications)
IC, RFPAL, 225MHz–3800MHz,
SC1894A-00N13* FW4.5.01.00 (for narrow band
applications)
*Recommended for new designs.
Shipping Designator:
E = 7in tape and reel
Append shipping designator (E) at end of part number. If
left blank, designates bulk shipping option.
Evaluation Kit Ordering Information
PART NUMBER
SC1894-EVK200
SC1894-EVK500
SC1894-EVK900
DESCRIPTION
Eval Kit, RFPAL, 225-470MHz
Eval Kit, RFPAL, 470-928MHz
Eval Kit, RFPAL, 698-960MHz
SC1894-EVK1500 Eval Kit, RFPAL, 1350-1800MHz
SC1894-EVK1900 Eval Kit, RFPAL, 1800-2200MHz
SC1894-EVK2400 Eval Kit, RFPAL, 2300-2700MHz
SC1894-EVK3400 Eval Kit, RFPAL, 3300-3800MHz
SC-USB-SPI*
Adapter, SPI-USB Interface/Controller
*To be ordered separately from the evaluation kit.
Maxim Integrated
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SC1894
225MHz to 3800MHz RF Power
Amplifier Linearizer (RFPAL)
Revision History
REVISION
NUMBER
REVISION
DATE
PAGES
CHANGED
DESCRIPTION
0.2
0.3
0.4
1
9/14
Initial release
—
1, 4
3
12/14
12/14
7/20
Added part number for microwave applications
Added microwave block diagram
Added part number SC1894A-00N13* to Ordering Information table
17
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim Integrated’s website at www.maximintegrated.com.
Maxim Integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim Integrated product. No circuit patent licenses
are implied. Maxim Integrated reserves the right to change the circuitry and specifications without notice at any time. The parametric values (min and max limits)
shown in the Electrical Characteristics table are guaranteed. Other parametric values quoted in this data sheet are provided for guidance.
©
Maxim Integrated and the Maxim Integrated logo are trademarks of Maxim Integrated Products, Inc.
2020 Maxim Integrated Products, Inc.
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