SC1905A-00A00 [MAXIM]
698MHz to 3800MHz RF Power Amplifier Linearizer (RFPAL);
| 型号： | SC1905A-00A00 |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | 698MHz to 3800MHz RF Power Amplifier Linearizer (RFPAL) |
| 文件： | 总13页 (文件大小：159K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
EVALUATION KIT AVAILABLE
Click here for production status of specific part numbers.
SC1905
698MHz to 3800MHz RF Power Amplifier
Linearizer (RFPAL)
General Description
Benefits and Features
The SC1905 is a pin-compatible upgrade of the popular
SC1894 RF PA linearizer (RFPAL) supporting signal
bandwidths up to 100MHz. The SC1905 is a fully adaptive,
RFin/RFout predistortion linearization solution optimized
for a wide range of amplifiers, power levels, and communi-
cation protocols. The SC1905 uses the PA output and in-
put signals to adaptively generate an optimized correction
function in order to minimize the PA’s self-generated dis-
tortion and impairments. Using RF-domain analog signal
processing enables the SC1905 to operate over wide-sig-
nal bandwidths and consume very low power.
● RFin/RFout PA Linearizer SoC in Standard CMOS
• Fully Adaptive Correction
● External Reference Clock Support:
• 10MHz, 13MHz, 15.36MHz, 19.2MHz, 20MHz,
26MHz, and 30.72MHz
● Low Power Consumption: 1280mW
● Frequency Range: 698MHz to 3800MHz
● Input Signal Bandwidth: 5MHz to 100MHz
● Packaged in 9mm x 9mm QFN Package
● Operating Case Temperature: -40°C to +105°C
● Fully RoHS Compliant, Green Materials
● Ease of Use
Design support features are accessed through the
SC1905’s serial peripheral interface (SPI) bus.
• Integrated RFin/RFout Solution
• Reduced SW Development
Applications
● Reduces System Power Consumption and OPEX
● Reduces BOM Costs, Area, and Total Volume
• Smaller Power Supply, Heat Sink, and Enclosure
● 4G and 5G Cellular Infrastructure
• Single/Multicarrier, Multistandard: WCDMA, LTE,
and TD-LTE
2
• Small Implementation Size (< 6.5cm )
• BTS Amplifiers, RRH, Booster Amplifiers,
Repeaters, Small Cells, Microcells, Picocells, DAS,
AAS, and MIMO Systems
Ordering Information appears at end of data sheet.
● Wide Range of PAs and Output Power
• Amplifier: Class A/AB and Doherty
• PA Process: LDMOS, GaN, GaAs, and InGaP
● Any Application Requiring PA Linearization
19-100404; Rev 1; 10/18
SC1905
698MHz to 3800MHz RF Power Amplifier Linearizer
(RFPAL)
Absolute Maximum Ratings
Supply Voltage (A/VDD33 to GND)....................... -0.3V to +3.8V
Supply Voltage (A/VDD18 to GND)....................... -0.2V to +2.2V
Input Voltage (1.8V pins)...................... -0.2V to A/VDD18 + 0.2V
Input Voltage (3.3V pins)...................... -0.3V to A/VDD33 + 0.3V
Input into the BALUN (RMS) .............................................+7dBm
Storage Temperature Range ..............................-65°C to +150°C
Operating Case Temperature ...............................-40°C to 105°C
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these
or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may
affect device reliability.
Package Information
QFN-64
Package Code
K6499MK+1B
21-0765
Outline Number
Land Pattern Number
90-0605
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.
Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a
four-layer board. For detailed information on package thermal considerations, refer to www.maximintegrated.com/
thermal-tutorial.
www.maximintegrated.com
Maxim Integrated | 2
SC1905
698MHz to 3800MHz RF Power Amplifier Linearizer
(RFPAL)
Electrical Characteristics
(Operation at +25°C, A/DVDD18 = 1.85V, A/DVDD33 = 3.3V, A/DVDD18 = 1.85V, and 20MHz external clock, unless otherwise
specified.)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Operating Rating
Operating Case
Temperature
-40
105
ºC
DC Electrical Characteristics
Supply Voltage (A/
VDD33 to GND)
3.1
3.3
1.85
1280
95
3.5
1.95
1700
120
V
V
Supply Voltage (A/
VDD18 to GND)
1.75
Average Power
Dissipation
(Note 1) (Note 2) (Note 5)
(Note 1) (Note 2) (Note 5)
(Note 1) (Note 2) (Note 5)
mW
mA
mA
Supply Peak Current (A/
VDD33 to GND)
Supply Peak Current (A/
VDD18 to GND)
942
1100
Radio Frequency Signals
698 -
3800
Operating Frequency
MHz
Input Signal Bandwidth
Noise Power
(Note 3) (Note 4)
5 - 100
-140
MHz
Referred to 0dBm at PA input
dBm/Hz
RF Input Range for Maximum Correction—700MHz to 2700MHz
Minimum Peak
RFIN_BLN Level
When PA operates at maximum output
power. (Note 6) (Note 7)
-2
+4
dBm
dBm
dBm
dBm
dBm
dBm
dBm
dBm
When PA operates at maximum output
power. (Note 6) (Note 7)
Peak RFIN_BLN Level
Maximum Peak
RFIN_BLN Level
When PA operates at maximum output
power. (Note 6) (Note 7)
+6
Minimum Peak
RFFB_BLN Level
When PA operates at maximum output
power. (Note 6) (Note 7)
-12
When PA operates at maximum output
power. (Note 6) (Note 7)
Peak RFFB_BLN Level
-4
Maximum Peak
RFFB_BLN Level
When PA operates at maximum output
power. (Note 6) (Note 7)
-2
RFIN_BLN Operating
Range
Average power, over PA output power
range
-49 to -4
RFFB_BLN Operating
Range
Average power, over PA output power
range
-52 to
-12
RF Input Range for Maximum Correction—2700MHz to 3300MHz
When PA operates at maximum output
power. (Note 6) (Note 7)
Peak RFIN_BLN Level
Peak RFFB_BLN Level
+6
-4
dBm
dBm
When PA operates at maximum output
power. (Note 6) (Note 7)
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Maxim Integrated | 3
SC1905
698MHz to 3800MHz RF Power Amplifier Linearizer
(RFPAL)
Electrical Characteristics (continued)
(Operation at +25°C, A/DVDD18 = 1.85V, A/DVDD33 = 3.3V, A/DVDD18 = 1.85V, and 20MHz external clock, unless otherwise
specified.)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
RFIN_BLN Operating
Range
Average power, over PA output power
range
-44 to -4
dBm
RFFB_BLN Operating
Range
Average power, over PA output power
range
-54 to
-14
dBm
RF Input Range for Maximum Correction—3300MHz to 3800MHz
Minimum Peak
RFIN_BLN Level
When PA operates at maximum output
power. (Note 6) (Note 7)
+3
+9
dBm
dBm
dBm
dBm
dBm
dBm
dBm
dBm
When PA operates at maximum output
power. (Note 6) (Note 7)
Peak RFIN_BLN Level
Maximum Peak
RFIN_BLN Level
When PA operates at maximum output
power. (Note 6) (Note 7)
+11
-12
Minimum Peak
RFFB_BLN Level
When PA operates at maximum output
power. (Note 6) (Note 7)
When PA operates at maximum output
power. (Note 6) (Note 7)
Peak RFFB_BLN Level
-4
Maximum Peak
RFFB_BLN Level
When PA operates at maximum output
power. (Note 6) (Note 7)
-2
RFIN_BLN Operating
Range
Average power, over PA output power
range
-41 to +1
RFFB_BLN Operating
Range
Average power, over PA output power
range
-52 to
-12
Digital I/O - DC Characteristics
Minimum CMOS Input
Logic-Low
V
V
-0.3
+0.8
2.0
V
V
V
V
V
IL
Maximum CMOS Input
Logic-Low
IL
Minimum CMOS Input
Logic-High
V
IH
V
V
= 3.3V
= 3.3V
DD
Maximum CMOS Output
Logic-Low
V
0.4
OL
OH
Minimum CMOS Output
Logic-High
V
2.4
DD
EEPROM Endurance
Minimum EEPROM
write/erase cycles
E/W
Cycles
Page mode, +25°C
1M
Note 1: Continuous adaptation, tracking.
Note 2: Power dissipation may be FW dependent. Refer to the FW release notes for any changes to values listed above.
Note 3: In the case where the carrier configuration is NON-fully occupied, then the average 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
center frequency must be stored in EEPROM.
Note 4: Correction performance across range of input signal BWs also depends on PA output power and carrier configuration.
Note 5: Characterized at typical voltages, +25°C operating case temperature, and 100MHz input signal bandwidth.
-4
Note 6: Peak power is defined as the 10 point on the CCDF (complementary cumulative distribution function) of the signal.
Note 7: Referred to 50Ω impedance into a 1:2 balun.
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Maxim Integrated | 4
SC1905
698MHz to 3800MHz RF Power Amplifier Linearizer
(RFPAL)
Pin Configuration
64
63
62
61
60
59
58
57
56
55
54
53
52
51
50
49
DVDD18
1
2
3
4
5
6
7
8
9
10
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
DVDD18
AVDD18
MGPOUT0
MGPOUT1
AVDD18
AVDD33
GND
XTALO
XTALI
FLTCAP3N
FLTCAP3P
AVDD18
GND
RFOUTP
RFOUTN
GND
AVDD18
SC1905
FLTCAP2N
FLTCAP2P
FLTCAP1N
FLTCAP1P
AVDD18
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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Maxim Integrated | 5
SC1905
698MHz to 3800MHz RF Power Amplifier Linearizer
(RFPAL)
Pin Description
PIN
NAME
FUNCTION
TYPE
1
DVDD18 +1.8V DC Supply Voltage for Digital Circuits.
Supply
MGPOUT
Analog
Out
2
3
Do Not Connect. Reserved for internal use.
0
MGPOUT
Analog
Out
Do Not Connect. Reserved for internal use.
1
4
5
6
7
AVDD18
AVDD33
+1.8V DC Supply Voltage for Analog Circuits
+3.3V DC Supply Voltage for Analog Circuits
Ground
Supply
Supply
Supply
GND
Ground for Shield of RF Signal
RF Shield
Analog
Out
8
RFOUTP RF Output Signal, Differential Positive Output.
RFOUTN RF Output Signal, Differential Negative Output
Analog
Out
9
10
GND
Ground for Shield of RF Signal.
RF Shield
Supply
11, 12
AVDD18
+1.8V DC Supply Voltage for Analog Circuits.
Supply
MGPOUT
2
Analog
Out
13
14
Do Not Connect. Reserved for internal use.
Do Not Connect. Reserved for internal use.
MGPOUT
3
Analog
Out
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
GND
BGRES
AVDD33
GND
Ground
Supply
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
RFINN
GND
RF Input Signal, Differential Positive Input.
RF Input Signal, Differential Negative Input.
Ground for Shield of RF Signal.
AVDD18
AVDD33
+1.8V DC Supply Voltage for Analog Circuits.
+3.3V DC Supply Voltage for Analog Circuits.
Supply
ADCIN0P Do Not Connect. Reserved for internal use.
ADCIN0N Do Not Connect. Reserved for internal use.
ADCIN1P Do Not Connect. Reserved for internal use.
ADCIN1N Do Not Connect. Reserved for internal use.
Analog In
Analog In
Analog In
Analog In
Supply
AVDD33
GND
+3.3V DC Supply Voltage for Analog Circuits.
Ground for Shield of RF Signal.
RF Shield
Analog In
Analog In
RF Shield
RFFBP
RFFBN
GND
RF Feedback Signal, Differential Positive Input.
RF Feedback Signal, Differential Negative Input.
Ground for Shield of RF Signal.
FLTCAP0
P
Analog
Out
33
Dedicated External Filter Capacitor #0.
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Maxim Integrated | 6
SC1905
698MHz to 3800MHz RF Power Amplifier Linearizer
(RFPAL)
Pin Description (continued)
PIN
NAME
FUNCTION
TYPE
FLTCAP0
N
Analog
Out
34
Dedicated External Filter Capacitor #0.
Supply
Supply
35, 36
AVDD18
+1.8V DC Supply Voltage for Analog Circuits.
FLTCAP1
P
Analog
Out
37
38
39
40
Dedicated External Filter Capacitor #1.
Dedicated External Filter Capacitor #1.
Dedicated External Filter Capacitor #2.
Dedicated External Filter Capacitor #2.
FLTCAP1
N
Analog
Out
FLTCAP2
P
Analog
Out
FLTCAP2
N
Analog
Out
Supply
Supply
41, 42
AVDD18
+1.8V DC Supply Voltage for Analog Circuits.
FLTCAP3
P
Analog
Out
43
44
45
46
Dedicated External Filter Capacitor #3.
Dedicated External Filter Capacitor #3.
FLTCAP3
N
Analog
Out
Crystal Input. For standard internal clock, connect crystal or ceramic resonator from XTALI
to XTALO. May alternatively be driven by an external clock.
XTALI
Analog In
Analog
Out
XTALO
Crystal Output. Excitation driver for crystal or ceramic resonator.
+1.8V DC Supply Voltage for Analog Circuits.
47
48
49
AVDD18
Supply
Supply
DVDD18 +1.8V DC Supply Voltage for Digital Circuits.
RESETN Active-Low Reset Input. Has internal pullup to DVDD33.
Digital In
Watch Dog Timer Enable. WDTENB enabled when high. Has internal pullup to DVDD33.
See applications schematic for further details.
50
WDTENB
Digital In
51
52
53
54
55
SCLK
SSN
SDI
SPI Clock. Has internal pulldown to GND.
Digital In
Digital In
Digital In
Digital Out
Supply
SPI Slave Select Enabled "Low". Has internal pullup to DVDD33.
SPI Slave Data Input to RFPAL. Has internal pulldown to GND.
SPI Slave Data Output from RFPAL. Tri-state. DVDD33 logic.
SDO
DVDD18 +1.8V DC Supply Voltage for Digital Circuits.
Digital General Purpose Input 1. Has internal pullup to DVDD33. See Firmware Release
Notes for further details.
56
57
DGPIN1
Digital In
General Purpose Status Output, as Defined in Firmware Release Notes. Open-drain output
with internal pullup to DVDD33.
STATO
Digital Out
58
59
DVDD33 +3.3V DC Supply Voltage for Digital Circuits.
DVDD18 +1.8V DC Supply Voltage for Digital Circuits.
Supply
Supply
Load Enable. Required for FW upgrades. Has internal pulldown to GND. See applications
schematic for further details.
60
61
LOADENB
Digital In
TESTSEL
Do Not Connect. Reserved for internal use. Has internal pulldown to GND.
1
Reserved
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Maxim Integrated | 7
SC1905
698MHz to 3800MHz RF Power Amplifier Linearizer
(RFPAL)
Pin Description (continued)
PIN
NAME
FUNCTION
TYPE
TESTSEL
2
62
Do Not Connect. Reserved for internal use. Has internal pulldown to GND.
Reserved
Digital General Purpose Input 0. Do not connect. Reserved for future use. Has internal
pulldown to GND. See applications schematic for further details.
63
DGPIN0
Digital In
64
65
DVDD18 +1.8V DC Supply Voltage for Digital Circuits.
Supply
Supply
GNDPAD Common Ground for Entire Integrated Circuit. Also provides path for thermal dissipation.
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Maxim Integrated | 8
SC1905
698MHz to 3800MHz RF Power Amplifier Linearizer
(RFPAL)
Detailed Description
The SC1905 is the latest generation of RFPAL linearizer IC. The maximum signal bandwidth has been increased to
100MHz from the previous generation SC1894 device in order to support 5G signals.
Introduction to Predistortion Using the SC1905
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 component and
operating costs of the power amplifier. Better linearity may be achieved through the use of digital predistortion and other
linearization techniques, but many of these are time consuming and costly to implement. 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 implementations. Further, there continues to be a strong push
toward reducing the total capital and operating costs of base stations.
With the SC1905, 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 elegant solution
that reduces development costs and speeds time to market. Applicable across a broad range of signals—including 2G,
3G, 4G, 5G wireless, and other modulation types—the powerful analog signal-processing engine is capable of linearizing
the most efficient power amplifier topologies. The SC1905 is a true RFin and RFout solution, supporting modular power
amplifier designs that are independent of the baseband and transceiver subsystems. The SC1905 delivers the required
efficiency and performance demanded by today’s wireless systems.
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Maxim Integrated | 9
SC1905
698MHz to 3800MHz RF Power Amplifier Linearizer
(RFPAL)
Serial Peripheral Interface (SPI)
The SC1905 contains a microprocessor that is executing firmware. The system software referred to henceforth as
the "host", communicates with the firmware through a handshaking protocol called the message protocol. The host
configures the SC1905 by writing to various parameters stored in an EEPROM contained within the SC1905, or by
issuing commands to the firmware through the message protocol. All this communication is done through a 4-wire Serial
Peripheral Interface (SPI).
Detailed information on the message protocol, accessing EEPROM, etc. is contained in the SC1905 SPI Programming
Guide. Figure 1 shows the timing relationships between the SPI signals. Refer to Table 1.
tDIS
SSN
tCP
tCH
tSS
tSH
tR
tF
SCLK
SDI
tDH
tDS
tOV
tOD
SDO
Figure 1. Serial Interface Timing Diagram
Table 1. Serial Interface Timing Requirements
PARAMETER
Minimum Select Setup Time
SYMBOL
MIN
TYP
100
250
100
25
MAX
UNITS
ns
t
SS
Minimum Select Hold Time
Minimum Select Disable Time
Minimum Data Setup Time
Minimum Data Hold Time
Maximum Rise Time
t
ns
SH
t
ns
DIS
t
ns
DS
DH
t
45
ns
t
25
ns
R
Maximum Fall Time
t
25
ns
F
Minimum Clock Period
t
250
100
100
50
ns
CP
CH
OV
OD
Minimum Clock High Time
Maximum Time to Output Valid
Maximum Output Data Disable
t
t
ns
ns
t
ns
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Maxim Integrated | 10
SC1905
698MHz to 3800MHz RF Power Amplifier Linearizer
(RFPAL)
Applications Information
External Clock (XTALI) Requirements
PARAMETER
External Clock Frequency*
External Clock Frequency Accuracy
External Clock Frequency Drift
Duty Cycle
CONDITIONS
MIN
TYP
MAX
30.72
1
UNITS
MHz
%
10
20
Including aging and temperature
Square wave
100
55
ppm
%
45
External Clock Amplitude
External Clock Phase
Sine or square wave
At 100kHz
500
1500
-130
mV
p-p
dBc/Hz
*Selecting an external reference clock frequency other than 20MHz requires programming the SC1905 through the SPI
bus. See SPI Programming Guide and Hardware Design Guide for more information. User may program the SC1905 to
accept the following clock frequencies: 10MHz, 13MHz, 15.36MHz, 19.2MHz, 20MHz, 26MHz, and 30.72MHz.
Crystal Requirements
PARAMETER
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 temerature
Auxiliary Documentation
From a programming perspective, the SC1905, like previous RFPAL products, is quite complex. An entire document, the
SC1905 SPI Programming Guide, is dedicated to describing how the host communicates with the SC1905. It describes
the communication protocol in addition to the addresses of all the variables and and parameters for monitoring the status
and configuration of the SC1905.
For guidance on how to design the SC1905 into a system; for example, recommendations on PCB layout, regulator and
delay line selection etc. please refer to the SC1905 Hardware Design Guide. The Firmware 6.0.01.00 Release Notes
provide data on linearization performance of the firmware. These auxiliary documents are available on the SC1905
product web page on Maxim's website.
www.maximintegrated.com
Maxim Integrated | 11
SC1905
698MHz to 3800MHz RF Power Amplifier Linearizer
(RFPAL)
Typical Application Circuits
VDD
ANTENNA
NO DELAY TO
FEEDBACK
COUPLER
CORRECTION
COUPLER
6NS
INPUT COUPLER
CIRCULATOR/
FILTER/
DUPLEXER
DELAY
RFIN
PA
CPLIN
CPLOUT
RFOUT
SC1905
RFPAL
RECEIVER
RFINP
BALUN
RFOUTP
RFOUTN
BALUN
RFINN
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
Ordering Information
PART NUMBER
SC1905A-00A00
DESCRIPTION
Bulk
FIRMWARE VERSION
6.0.01.00
SC1905A-00A00E
Tape-and-Reel
6.0.01.00
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Maxim Integrated | 12
SC1905
698MHz to 3800MHz RF Power Amplifier Linearizer
(RFPAL)
Revision History
REVISION REVISION
PAGES
DESCRIPTION
CHANGED
NUMBER
DATE
10/18
10/18
0
1
Initial release
Updated Ordering Information
—
12
For pricing, delivery, and ordering information, please visit Maxim Integrated’s online storefront at https://www.maximintegrated.com/en/storefront/storefront.html.
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.
© 2018 Maxim Integrated Products, Inc.
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