MAX2411AEEI [MAXIM]
Low-Cost RF Up/Downconverter with LNA and PA Driver; 低成本，RF上/下变频器，带有LNA和PA驱动器
| 型号： | MAX2411AEEI |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | Low-Cost RF Up/Downconverter with LNA and PA Driver |
| 文件： | 总14页 (文件大小：136K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
19-1324; Rev 1; 2/98
Lo w -Co s t RF Up /Do w n c o n ve rt e r
w it h LNA a n d PA Drive r
MX241A
________________Ge n e ra l De s c rip t io n
____________________________Fe a t u re s
♦ Low-Cost Silicon Bipolar Design
The MAX2411A performs the RF front-end transmit/
receive function in time-division-duplex (TDD) communi-
cation systems. It operates over a wide frequency range
and is optimized for RF frequencies around 1.9GHz.
Applications include most popular cordless and PCS
standards. The MAX2411A includes a low-noise amplifier
(LNA), a downconverter mixer, a local-oscillator buffer, an
upconverter mixer, and a variable-gain power-amplifier
(PA) driver in a low-cost, plastic surface-mount package.
The MAX2411A’s unique bidirectional, differential IF port
reduces cost and component count by allowing the trans-
mit and receive paths to share the same IF filter.
♦ Integrated Upconvert/Downconvert Function
♦ Operates from a Single +2.7V to +5.5V Supply
♦ 3.2dB Combined Receiver Noise Figure:
2.4dB (LNA)
9.2dB (mixer)
♦ Flexible Power-Amplifier Driver:
18dBm Output Third-Order Intercept (OIP3)
35dB Gain-Control Range
♦ LO Buffer for Low LO Drive Level
The LNA has a 2.4dB typical noise figure and a -10dBm
input third-order intercept point (IP3). The downconvert-
er mixer has a low 9.2dB noise figure and 4dBm input
IP3. Image and local-oscillator filtering are implemented
off-chip for maximum flexibility. The PA driver amplifier
has 15dB of gain, which can be reduced over a 35dB
range. Power consumption is only 60mW in receive
mode and 90mW in transmit mode and drops to less
than 3µW in shutdown mode.
♦ Low Power Consumption:
60mW Receive
90mW Full-Power Transmit
♦ 0.3µW Shutdown Mode
♦ Flexible Power-Down Modes Compatible with
MAX2510/MAX2511 IF Transceivers
_______________Ord e rin g In fo rm a t io n
For applications requiring separate, single-ended IF
inp ut a nd outp ut p orts , re fe r to the MAX2410 d a ta
sheet. For applications requiring only a receive func-
tion, Maxim offers a low-cost downconverter with LNA
(see the MAX2406 data sheet).
PART
TEMP. RANGE
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
28 QSOP
MAX2411AEEI
MAX2411AE/D
Dice*
*Dice are specified at T = 25°C, DC parameters only.
A
________________________Ap p lic a t io n s
P in Co n fig u ra t io n
PWT1900
DECT
DCS1800/PCS1900
PHS/PACS
ISM-Band Transceivers
Iridium Handsets
TOP VIEW
GND
LNAIN
GND
1
2
28 GND
27 LNAOUT
26 GND
25 GND
24 RXMXIN
23 GND
22 IF
Typical Operating Circuit appears on last page.
3
MAX2411A
GND
4
Fu n c t io n a l Dia g ra m
V
CC
5
LNAOUT
RXMXIN
RX MIXER
RXEN
LO
6
7
LNAIN
LNA
LO
8
21 IF
IF
IF
LO
LO
TXEN
9
20 GND
19 TXMXOUT
18 GND
17 GND
16 PADRIN
15 GND
RXEN
TXEN
POWER
MANAGEMENT
V
CC
10
MAX2411A
GC 11
GND 12
PA DRIVER
PADROUT
TX MIXER
TXMXOUT
PADROUT 13
GND 14
GC PADRIN
QSOP
________________________________________________________________ Maxim Integrated Products
1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.
For small orders, phone 408-737-7600 ext. 3468.
Lo w -Co s t RF Up /Do w n c o n ve rt e r
w it h LNA a n d PA Drive r
ABSOLUTE MAXIMUM RATINGS
V
CC
to GND ................................................................-0.3V to 6V
Continuous Power Dissipation (T = +70°C)
A
LNAIN Input Power ...........................................................15dBm
LO, LO Input Power ..........................................................10dBm
PADRIN Input Power.........................................................10dBm
RXMXIN Input Power ........................................................10dBm
IF, IF Input Power (transmit mode) ...................................10dBm
QSOP (derate 11mW/°C above +70°C)........................909mW
Junction Temperature ......................................................+150°C
Operating Temperature Range ...........................-40°C to +85°C
Storage Temperature .........................................-65°C to +165°C
Lead Temperature (soldering, 10sec) .............................+300°C
Voltage at RXEN, TXEN, GC.......................-0.3V to (V + 0.3V)
CC
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.
MX241A
DC ELECTRICAL CHARACTERISTICS
(V = +2.7V to +5.5V, V
= +3.0V, RXEN = TXEN = 0.6V, PADROUT pulled up to V with 50Ω resistor; IF, IF pulled up to V
CC
GC
CC CC
with 50Ω resistor, TXMXOUT pulled up to V with 125Ω resistor, LNAOUT pulled up to V with 100Ω resistor, all RF inputs open,
CC
CC
T
A
= -40°C to +85°C. Typical values are at +25°C and V = +3.0V, unless otherwise noted.)
CC
PARAMETER
CONDITIONS
MIN
2.7
TYP
MAX
UNITS
V
Supply-Voltage Range
5.5
Digital Input Voltage High
RXEN, TXEN pins
RXEN, TXEN pins
RXEN = 2.0V
2.0
V
Digital Input Voltage Low
0.6
1
V
RXEN Input Bias Current (Note 1)
TXEN Input Bias Current (Note 1)
GC Input Bias Current
0.1
0.1
35
µA
µA
µA
mA
mA
µA
µA
TXEN = 2.0V
1
GC = 3V, TXEN = 2V
RXEN = 2.0V
51.1
29.6
44.7
520
10
Supply Current, Receive Mode
Supply Current, Transmit Mode
Supply Current, Standby Mode
Supply Current, Shutdown Mode
20
TXEN = 2.0V
30
RXEN = 2.0V, TXEN = 2.0V
160
0.1
V
CC
= 3.0V
AC ELECTRICAL CHARACTERISTICS
(MAX2411A EV kit, V
= +3.0V, V
= +2.15V, RXEN = TXEN = low, a ll me a sure me nts pe rforme d in 50Ω e nvironme nt,
CC
GC
f
LO
= 1.5GHz, P
= -10d Bm, f
= f
= f
= 1.9GHz, P
= -32d Bm, P
= P
= -22d Bm,
LO
LNAIN
PADRIN
RXMXIN
LNAIN
PADRIN
RXMXIN
f
= 400MHz, P = -32dBm (Note 1), T = +25°C, unless otherwise noted.)
IF, IF
IF
A
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
LOW-NOISE AMPLIFIER (RXEN = high)
T
= +25°C
14.2
12.6
16.2
17.4
19.1
A
Gain (Note 2)
dB
T
A
= T to T
MIN MAX
Noise Figure
2.4
-10
-5
dB
Input IP3
(Note 3)
dBm
dBm
dBm
Output 1dB Compression
LO to LNAIN Leakage
RECEIVE MIXER (RXEN = high)
RXEN = high or low
-49
T
= +25°C
8.5
7.5
9.4
10.0
10.9
A
Conversion Gain (Note 2)
dB
T
A
= -40°C to +85°C
Noise Figure
Single sideband
(Note 4)
9.2
4.0
dB
Input IP3
dBm
dBm
MHz
dBm
Input 1dB Compression
IF Frequency
-7.7
(Notes 2, 5)
(Note 6)
450
Minimum LO Drive Level
-17
2
_______________________________________________________________________________________
Lo w -Co s t RF Up /Do w n c o n ve rt e r
w it h LNA a n d PA Drive r
MX241A
AC ELECTRICAL CHARACTERISTICS (continued)
(MAX2411A EV kit, V
= +3.0V, V
= +2.15V, RXEN = TXEN = low, a ll me a sure me nts pe rforme d in 50Ω e nvironme nt,
CC
GC
f
LO
= 1.5GHz, P
= -10d Bm, f
= f
= f
= 1.9GHz, P
= -32d Bm, P
= P
= -22d Bm,
RXMXIN
LO
LNAIN
PADRIN
RXMXIN
LNAIN
PADRIN
f
= 400MHz, P = -32dBm (Note 1), all impedance measurements made directly to pin (no matching network), T = +25°C,
IF, IF
I
F
A
unless otherwise noted.)
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
TRANSMIT MIXER (TXEN = high)
T
= +25°C
6.8
5.7
8.5
9.3
A
Conversion Gain (Note 1)
dB
T
A
= T
to T
MAX
10.4
MIN
Output IP3
(Notes 1, 7)
0.5
-11.1
-58
dBm
dBm
dBm
dB
Output 1dB Compression Point
LO Leakage
Noise Figure
Single sideband
(Notes 2, 5)
8.3
IF Frequency
450
MHz
F
OUT
F
OUT
F
OUT
= 2LO-2IF = 2.2GHz
-45.5
-70
Intermod Spurious Response
(Note 8)
= 2LO-3IF = 1.8GHz
= 3LO-6IF = 2.1GHz
dBc
-90
PA DRIVER (TXEN = high)
T
= +25°C
13
15
16.4
17
A
Gain (Note 2)
dB
T
A
= T
to T
MAX
12.3
MIN
Output IP3
(Note 4)
18
6.3
35
12
dBm
dBm
dB
Output 1dB Compression Point
Gain-Control Range
Gain-Control Sensitivity
(Note 9)
dB/V
LOCAL-OSCILLATOR INPUTS (RXEN = TXEN = high)
Receive mode (TXEN = low)
Transmit mode (RXEN = low)
1.10
1.02
Input Relative VSWR
POWER MANAGEMENT (RXEN = TXEN = low)
Receiver Turn-On Time (Notes 2, 10)
Transmitter Turn-On Time (Notes 2, 11)
RXEN = low to high
TXEN = low to high
0.5
0.3
2.5
2.5
µs
µs
Note 1: Power delivered to IF SMA connector of MAX2411A EV kit. Power delivered to MAX2411A IC is approximately 1.0dB less
due to balun losses.
Note 2: Guaranteed by design and characterization.
Note 3: Two tones at 1.9GHz and 1.901GHz at -32dBm per tone.
Note 4: Two tones at 1.9GHz and 1.901GHz at -22dBm per tone.
Note 5: Mixer operation guaranteed to this frequency. For optimum gain, adjust output match. See the Typical Operating
Characteristics for graphs of IF port impedance versus IF frequency.
Note 6: At this LO drive level, the mixer conversion gain is typically 1dB lower than with -10dBm LO drive.
Note 7: Two tones at 400MHz and 401MHz at -32dBm per tone.
Note 8: Transmit mixer output at -17dBm.
Note 9: Calculated from measurements taken at V = 1.0V and V = 1.5V.
GC
GC
Note 10: Time from RXEN = low to RXEN = high transition until the combined receive gain is within 1dB of its final value. Measured
with 47pF blocking capacitors on LNAIN and LNAOUT.
Note 11: Time from TXEN = low to TXEN = high transition until the combined transmit gain is within 1dB of its final value. Measured
with 47pF blocking capacitors on PADRIN and PADROUT.
_______________________________________________________________________________________
3
Lo w -Co s t RF Up /Do w n c o n ve rt e r
w it h LNA a n d PA Drive r
__________________________________________Typ ic a l Op e ra t in g Ch a ra c t e ris t ic s
(MAX2411A EV kit, V = +3.0V, V = +2.15V, RXEN = TXEN = low, all measurements performed in 50Ω environment,
CC
GC
f
LO
= 1.5GHz, P = -10dBm, f
= f
= f
= 1.9GHz, P
= -32dBm, P
= P
= -22dBm,
RXMXIN
LO
LNAIN
PADRIN
RXMXIN
LNAIN
PADRIN
f
= 400MHz, P = -32dBm (Note 1), all impedance measurements made directly to pin (no matching network), T = +25°C,
IF, IF
IF
A
unless otherwise noted.)
RECEIVE-MODE SUPPLY CURRENT
vs. TEMPERATURE
TRANSMIT-MODE SUPPLY CURRENT
SHUTDOWN SUPPLY CURRENT
vs. TEMPERATURE
vs. TEMPERATURE
24
23
22
21
20
19
18
17
0.10
0.09
0.08
0.07
0.06
0.05
0.04
0.03
0.02
0.01
0
38
36
34
32
30
28
26
RXEN = V
CC
TXEN = V
RXEN = TXEN = GND
CC
V
CC
= 5.5V
MX241A
V
= 5.5V
CC
V
CC
= 4.0V
V
CC
= 4.0V
= 3.0V
V
= 5.5V
CC
V
= 4.0V
CC
V
CC
= 3.0V
V
CC
V
CC
= 3.0V
V
CC
= 2.7V
V
= 2.7V
10
V
CC
= 2.7V
CC
-40
-15
10
35
60
85
-40
-15
10
35
60
85
-40
-15
35
60
85
TEMPERATURE (°C)
TEMPERATURE (°C)
TEMPERATURE (°C)
LNA INPUT IMPEDANCE
vs. FREQUENCY
LNA OUTPUT IMPEDANCE
vs. FREQUENCY
STANDBY SUPPLY CURRENT
vs. TEMPERATURE
MAX2411A-05
MAX2411A-06
250
200
150
100
50
0
500
400
300
200
100
0
40
120
100
80
60
40
20
0
RXEN = TXEN = 2.0V
RXEN = V
CC
IMAGINARY
0
-25
V
CC
= 5.5V
RXEN = V
CC
IMAGINARY
-40
-80
-120
-160
-200
-50
V
= 4.0V
CC
-75
REAL
REAL
-100
V
CC
= 3.0V
35
V
CC
= 2.7V
0
-125
3.0
0
0.5
1.0
1.5
2.0
2.5
-40
-15
10
60
85
0
0.5
1.0
1.5
2.0
2.5
3.0
FREQUENCY (GHz)
TEMPERATURE (°C)
FREQUENCY (GHz)
LNA GAIN vs. FREQUENCY
LNA GAIN vs. TEMPERATURE
LNA INPUT IP3 vs. TEMPERATURE
30
25
20
15
10
5
20
19
18
17
16
15
14
13
-5
-6
1pF SHUNT CAPACITOR AT LNA INPUT
USING EV KIT MATCHING CIRCUIT
(OPTIMIZED FOR 1.9GHz)
RXEN = V
CC
RXEN = V
CC
V
CC
= 5.5V
-7
V
CC
= 3.0V
V
CC
= 4.0V
-8
V
CC
= 2.7V
RXEN = V
CC
-9
-10
-11
-12
-13
-14
-15
V
= 4.0V
CC
V
CC
= 2.7V
10
V
CC
= 5.5V
V
CC
= 3.0V
0
0
0.5
1.0
1.5
2.0
2.5
3.0
-40
-15
35
60
85
-40 -20
0
20
40
60
80 100
FREQUENCY (GHz)
TEMPERATURE (°C)
TEMPERATURE (°C)
4
_______________________________________________________________________________________
Lo w -Co s t RF Up /Do w n c o n ve rt e r
w it h LNA a n d PA Drive r
MX241A
_____________________________Typ ic a l Op e ra t in g Ch a ra c t e ris t ic s (c o n t in u e d )
(MAX2411A EV kit, V = +3.0V, V = +2.15V, RXEN = TXEN = low, all measurements performed in 50Ω environment, f = 1.5GHz,
CC
GC
LO
P
P
= -10dBm, f
= f
= f
= 1.9GHz, P
= -32dBm, P
= P
= -22dBm, f
= 400MHz,
LO
LNAIN
PADRIN
RXMXIN
LNAIN
PADRIN
RXMXIN
IF, IF
= -32dBm (Note 1), all impedance measurements made directly to pin (no matching network), T = +25°C, unless otherwise noted.)
IF
A
LNA OUTPUT 1dB COMPRESSION POINT
vs. SUPPLY VOLTAGE
PA DRIVER INPUT IMPEDANCE
vs. FREQUENCY
LNA NOISE FIGURE vs. FREQUENCY
MAX2411A-12
5.0
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0.0
0
-1
-2
-3
-4
-5
-6
160
140
120
100
80
70
TXEN = V
CC
RXEN = V
RXEN = V
CC
CC
30
IMAGINARY
-10
-50
-90
-130
-170
-210
-250
60
40
REAL
20
0
100
480
860
1240
1620
2000
2.7
3.2
3.7
4.2
4.7
5.2
0
0.5
1.0
1.5
2.0
2.5
3.0
FREQUENCY (MHz)
SUPPLY VOLTAGE (V)
FREQUENCY (GHz)
PA DRIVER OUTPUT IMPEDANCE
vs. FREQUENCY
PA DRIVER GAIN AND OUTPUT IP3
vs. GC VOLTAGE
PA DRIVER GAIN vs. FREQUENCY
MAX2411A-13
200
175
150
125
100
75
50
20
15
10
5
30
25
20
15
10
5
USING EV KIT
MATCHING NETWORK
(OPTIMIZED FOR 1.9GHz)
TXEN = V
CC
TXEN = V
CC
0
IMAGINARY
-50
IP3
TXEN = V
CC
-100
-150
-200
-250
-300
-350
0
GAIN
-5
-10
-15
-20
-25
-30
50
REAL
25
0
0
0
0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2
GC VOLTAGE (V)
0
0.5
1.0
1.5
2.0
2.5
3.0
0
0.5
1.0
1.5
2.0
2.5
3.0
FREQUENCY (GHz)
FREQUENCY (GHz)
PA DRIVER OUTPUT IP3
vs. TEMPERATURE
PA DRIVER OUTPUT 1dB COMPRESSION
vs. SUPPLY VOLTAGE
PA DRIVER GAIN vs. TEMPERATURE
21
20
19
18
17
16
15
14
18
17
16
15
14
13
12
8
6
TXEN = V
TXEN = V
CC
CC
V
GC
= 2.15V
V
= 5.5V
CC
V
= 5.5V
CC
4
V
= 4.0V
TXEN = V
CC
CC
V
= 4.0V
CC
2
V
= 3.0V
CC
V
CC
= 2.7V
0
V
CC
= 3.0V
V
= 2.7V
CC
-2
-4
V
GC
= 1.0V
-40
-15
10
35
60
85
-40 -20
0
20
40
60
80 100
2.7
3.2
3.7
4.2
4.7
5.2
5.7
TEMPERATURE (°C)
TEMPERATURE (°C)
SUPPLY VOLTAGE (V)
_______________________________________________________________________________________
5
Lo w -Co s t RF Up /Do w n c o n ve rt e r
w it h LNA a n d PA Drive r
_____________________________Typ ic a l Op e ra t in g Ch a ra c t e ris t ic s (c o n t in u e d )
(MAX2411A EV kit, V = +3.0V, V = +2.15V, RXEN = TXEN = low, all measurements performed in 50Ω environment, f = 1.5GHz,
CC
GC
LO
P
P
= -10dBm, f
= f
= f
= 1.9GHz, P
= -32dBm, P
= P
= -22dBm, f
= 400MHz,
LO
LNAIN
PADRIN
RXMXIN
LNAIN
PADRIN
RXMXIN
IF, IF
= -32dBm (Note 1), all impedance measurements made directly to pin (no matching network), T = +25°C, unless otherwise noted.)
IF
A
PA DRIVER NOISE FIGURE
RECEIVE MIXER INPUT IMPEDANCE
PA DRIVER
vs. GAIN-CONTROL VOLTAGE
vs. FREQUENCY
NOISE FIGURE vs. FREQUENCY
MAX2410A-21
10
9
8
7
6
5
4
3
2
1
0
30
25
20
15
10
5
100
90
80
70
60
50
40
30
20
10
0
0
RXEN = V
CC
-20
TXEN = V
CC
-40
IMAGINARY
TXEN = V
CC
MX241A
-60
-80
-100
-120
-140
-160
-180
-200
REAL
0
0
0.5
1.0
1.5
2.0
2.5
3.0
0.0
0.5
1.0
1.5
2.0
2.5
3.0
0
0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0
FREQUENCY (GHz)
GAIN-CONTROL VOLTAGE (V)
FREQUENCY (GHz)
RECEIVE MIXER CONVERSION
GAIN vs. TEMPERATURE
RECEIVE MIXER INPUT IP3
vs. TEMPERATURE
RECEIVE MIXER CONVERSION GAIN
vs. RF FREQUENCY
18
16
14
12
10
8
12
11
10
9
6
5
4
3
2
1
0
IF = 400MHz
RXEN = V
CC
V
CC
= 5.5V
V
= 4.0V
CC
V
CC
= 5.5V
NARROW BAND MATCH
AT RXMXIN, EV KIT
MATCH AT IF, IF
V
CC
= 2.7V
8
7
V
= 3.0V
CC
EV KIT
MATCHING NETWORK
AT RXMXIN AND IFOUT
6
6
V
= 2.7V
CC
5
4
4
2
3
0
RXEN = V
CC
RXEN = V
CC
2
-2
-40 -20
0
20
40
60
80
-40 -20
0
20
40
60
80
0.5
1.0
1.5
2.0
2.5
3.0
TEMPERATURE (°C)
TEMPERATURE (°C)
RF FREQUENCY (GHz)
RECEIVE MIXER GAIN AND NOISE FIGURE
vs. LO POWER
IF OR IF OUTPUT IMPEDANCE
vs. FREQUENCY
TRANSMIT MIXER OUTPUT IMPEDANCE
vs. FREQUENCY
MAX2411A-27
MAX2411Atoc26
14
13
12
11
10
9
300
250
200
150
100
50
0
1000
800
600
400
200
0
0
TXEN = V
CC
RXEN = V
CC
RXEN = V
CC
-25
-300
-600
-900
-1200
-1500
NOISE FIGURE
IMAGINARY
REAL
-50
IMAGINARY
-75
-100
-125
-150
-175
-200
GAIN
SINGLE-ENDED
8
7
0
6
-50
-100
5
REAL
4
-18 -16 -14 -12 -10 -8 -6 -4 -2
LO POWER (dBm)
0
0
200
400
600
800
1000
0
0.5
1.0
1.5
2.0
2.5
3.0
FREQUENCY (MHz)
FREQUENCY (GHz)
6
_______________________________________________________________________________________
Lo w -Co s t RF Up /Do w n c o n ve rt e r
w it h LNA a n d PA Drive r
MX241A
_____________________________Typ ic a l Op e ra t in g Ch a ra c t e ris t ic s (c o n t in u e d )
(MAX2411A EV kit, V = +3.0V, V = +2.15V, RXEN = TXEN = low, all measurements performed in 50Ω environment, f = 1.5GHz,
CC
GC
LO
P
= -10dBm, f
= f
PADRIN
= f
RXMXIN
= 1.9GHz, P
= -32dBm, P
= P
= -22dBm, f = 400MHz, P = -32dBm
IF, IF IF
LO
LNAIN
LNAIN
PADRIN
RXMXIN
(Note 1), all impedance measurements made directly to pin (no matching network), T = +25°C, unless otherwise noted.)
A
TRANSMIT MIXER CONVERSION GAIN
vs. TEMPERATURE
TRANSMIT MIXER OUTPUT IP3
vs. TEMPERATURE
TRANSMIT MIXER CONVERSION GAIN
vs. RF FREQUENCY
10
9
8
7
6
5
4
3
2
1
0
3.5
2.5
12
10
8
TXEN = V
NARROW BAND AT TXMXOUT,
EV KIT MATCH AT IF, IF
CC
TXEN = V
CC
V
CC
= 5.5V
V
= 5.5V
CC
V
CC
= 4.0V
V
= 2.7V
CC
1.5
V
CC
= 4.8V
6
EV KIT MATCH NETWORK
AT TXMXOUT AND IF, IF
0.5
4
V
CC
= 3.0V
-0.5
-1.5
2
V
CC
= 2.7V
TXEN = V
CC
IF = 400MHz
0
0.5
1.0
1.5
2.0
2.5
3.0
-40 -20
0
20
40
60
80
-40
-20
0
20
40
60
80
RF FREQUENCY (GHz)
TEMPERATURE (°C)
TEMPERATURE (°C)
TRANSMIT MIXER GAIN AND NOISE FIGURE
vs. LO POWER
IF OR IF OUTPUT IMPEDANCE
vs. FREQUENCY
LO PORT RETURN LOSS vs. FREQUENCY
MAX2411Atoc32
10
0
5
1000
800
600
400
200
0
0
TXEN = V
CC
RXEN = V
CC
RXEN = TXEN = V
CC
9
8
7
6
5
-300
-600
-900
-1200
-1500
IMAGINARY
NF
10
15
20
25
30
35
40
GAIN
SINGLE-ENDED
REAL
-18
-15
-12
-9
-6
-3
0
0
0.5
1.0
1.5
2.0
2.5
3.0
0
200
400
600
800
1000
LO POWER (dBm)
FREQUENCY (GHz)
FREQUENCY (MHz)
_______________________________________________________________________________________
7
Lo w -Co s t RF Up /Do w n c o n ve rt e r
w it h LNA a n d PA Drive r
______________________________________________________________P in De s c rip t io n
PIN
NAME
FUNCTION
1, 3, 4, 12, 14,
18, 20, 23, 28
GND
Ground. Connect GND to the PC board ground plane with minimal inductance.
RF Input to LNA. AC couple to this pin. At 1.9GHz, LNAIN can be easily matched to 50Ω with one
external shunt 1pF capacitor.
2
LNAIN
Supply Voltage (2.7V to 5.5V). Bypass V to GND at each pin with a 47pF capacitor as close to
CC
each pin as possible.
5, 10
V
CC
MX241A
Logic-Level Enable for Receiver Circuitry. A logic high turns on the receiver. When TXEN and
RXEN are both at a logic high, the part is placed in standby mode, with a 160µA (typical) supply
current. If TXEN and RXEN are both at a logic low, the part is set to shutdown mode, with a
0.1µA (typical) supply current.
6
RXEN
7
8
LO
50Ω Local-Oscillator (LO) Input Port. AC couple to this pin.
50Ω Inverting Local-Oscillator Input Port. For single-ended operation, connect LO directly to
GND. If a differential LO signal is available, AC couple the inverted LO signal to this pin.
LO
Logic-Level Enable for Transmitter Circuitry. A logic high turns on the transmitter. When TXEN
and RXEN are both at a logic high, the part is placed in standby mode, with a 160µA (typical)
supply current. If TXEN and RXEN are both at a logic low, the part is set to shutdown mode, with
a 0.1µA (typical) supply current.
9
TXEN
GC
Gain-Control Input for PA Driver. By applying an analog control voltage between 0V and 2.15V, the
11
gain of the PA driver can be adjusted over a 35dB range. Connect to V for maximum gain.
CC
Power Amplifier Driver Output. AC couple to this pin. Use external shunt inductor to V to match
CC
13
15, 17
16
PADROUT
GND
PADROUT to 50Ω. This also provides DC bias. See the Typical Operating Characteristics for a
plot of PADROUT Impedance vs. Frequency.
PA Driver Input Grounds. Connect GND to the PC board ground plane with minimal inductance.
RF Input to Variable-Gain Power Amplifier Driver. Internally matched to 50Ω. AC couple to this
pin. This input typically provides a 2:1 VSWR at 1.9GHz. AC couple to this pin. See the Typical
Operating Characteristics for a plot of PADRIN Impedance vs. Frequency.
PADRIN
RF Output of Transmit Mixer (upconverter). Use an external shunt inductor to V as part of a
CC
19
21
TXMXOUT
matching network to 50Ω. This also provides DC bias. AC couple to this pin. See the Typical
Operating Characteristics for a plot of TXMXOUT Impedance vs. Frequency.
Differential IF Port of Transmit (Tx) and Receive (Rx) Mixers, Inverting Side. In Rx mode, this output
is an open collector and should be pulled up to V with an inductor. This inductor can be part of
CC
the matching network to the desired IF impedance in both Tx and Rx modes. Additionally, a resistor
may be placed across IF and IF to set a terminating impedance. In Tx mode, this input is internally
AC-coupled; however, AC couple to this pin externally. For single-ended operation, connect this
IF
port to V and bypass with 1000pF capacitor to GND.
CC
Differential IF Port of Tx and Rx Mixers, Noninverting Side. In Rx mode, this output is an open collec-
tor and should be pulled up to V with an inductor. This inductor can be part of the matching net-
CC
work to the desired IF impedance in both Tx and Rx modes. Additionally, a resistor may be placed
across IF and IF to set a terminating impedance. In Tx mode, this input is internally AC coupled;
however, AC couple to this pin externally.
22
IF
8
_______________________________________________________________________________________
Lo w -Co s t RF Up /Do w n c o n ve rt e r
w it h LNA a n d PA Drive r
MX241A
_________________________________________________P in De s c rip t io n (c o n t in u e d )
PIN
NAME
FUNCTION
RF Input to Receive Mixer (downconverter). This input typically requires a matching network for
connecting to an external filter. AC couple to this pin. See the Typical Operating Characteristics
for a plot of RXMXIN Impedance vs. Frequency.
24
RXMXIN
25
26
GND
GND
Receive Mixer Input Ground. Connect GND to the PC board ground plane with minimal inductance.
LNA Output Ground. Connect GND to the PC board ground plane with minimal inductance.
LNA Output. AC couple to this pin. This output typically provides a VSWR of better than 2:1 at fre-
quencies from 1.7GHz to 3GHz with no external matching components. At other frequencies, a
matching network may be required to match LNAOUT to an external filter. Consult the Typical
Operating Characteristics for a plot of LNA Output Impedance vs. Frequency.
27
LNAOUT
proper operation. These inductors are typically used as
part of an IF matching network.
_______________De t a ile d De s c rip t io n
The MAX2411A consists of five major components: a
tra ns mit mixe r followe d b y a va ria b le -g a in p owe r-
amplifier (PA) driver as well as a low-noise amplifier
(LNA), receive mixer, and power-management section.
In transmit mode, IF and IF are high-impedance inputs
that are internally AC coupled to the transmit mixer.
This internal AC coupling prevents the DC bias voltage
required for the receive mixer outputs from reaching
the transmit mixer inputs.
The following sections describe each of the blocks in
the MAX2411A Functional Diagram.
Re c e ive Mix e r
The receive mixer is a wideband, double-balanced
design with excellent noise figure and linearity. Inputs to
the mixer are the RF signal at the RXMXIN pin and the
LO inputs at LO and LO. The downconverted output sig-
nal appears at the IF port. For more information, see the
Bidirectional IF Port section. The conversion gain of the
receive mixer is typically 9.4dB with a 9.2dB noise figure.
Lo w -No is e Am p lifie r (LNA)
The LNA is a wideband, single-ended cascode amplifi-
er that can be used over a wide range of frequencies.
Re fe r to the LNA Ga in vs . Fre q ue nc y g ra p h in the
Typical Operating Characteristics. Its port impedances
are optimized for operation around 1.9GHz, requiring
only a 1pF shunt capacitor at the LNA input for a VSWR
of better than 2:1 and a noise figure of 2.4dB. As with
every LNA, the input match can be traded off for better
noise figure.
RF Input
The RXMXIN input is typically connected to the LNA out-
put through an off-chip filter. This input is externally
matched to 50Ω. See the Typical Operating Circuit for an
example matching network and the Receive Mixer Input
Impedance vs. Frequency graph in the Typical Operating
Characteristics.
P A Drive r
The PA d rive r ha s typ ic a lly 15d B of g a in, whic h is
adjustable over a 35dB range via the GC pin. At full gain,
the PA driver has a noise figure of 3.5dB at 1.9GHz.
For input and output matching information, refer to the
Typical Operating Characteristics for plots of PA Driver
Input and Output Impedance vs. Frequency.
Local-Oscillator Inputs
The LO and LO pins are internally terminated with 50Ω
on-chip resistors. AC couple the local-oscillator signal
to these pins. If a single-ended LO source is used, con-
nect LO directly to ground.
Bid ire c t io n a l IF P o rt
The MAX2411A has a unique bidirectional differential IF
port, which can eliminate the need for separate transmit
and receive IF filters, reducing cost and component count.
Consult the Typical Operating Circuit for more information.
For single-ended operation, connect the unused IF port to
Tra n s m it Mix e r
The transmit mixer takes an IF signal at the IF port and
upconverts it to an RF frequency at the TXMXOUT pin.
For more information on the IF port, see the Bidirectional
IF Port section. The conversion gain is typically 8.5dB,
a nd the outp ut 1d B c omp re s s ion p oint is typ ic a lly
11.1dBm at 1.9GHz.
V
CC
and bypass with a 1000pF capacitor to GND.
In receive mode, the IF and IF pins are open-collector
outputs that need external inductive pull-ups to V for
CC
_______________________________________________________________________________________
9
Lo w -Co s t RF Up /Do w n c o n ve rt e r
w it h LNA a n d PA Drive r
RF Output
Table 1. Advanced System Power-
Management Function
The transmit mixer output appears on the TXMXOUT
pin, an open-collector output that requires an external
pull-up inductor for DC biasing, which can be part of an
imp e d a nc e ma tc hing ne twork. Cons ult the Typ ic a l
Op e ra ting Cha ra c te ris tic s for a p lot of TXMXOUT
Impedance vs. Frequency.
RXEN
TXEN
FUNCTION
Shutdown
0
0
1
1
0
1
0
1
Transmit
Receive
Ad va n c e d S ys t e m P o w e r Ma n a g e m e n t
RXEN and TXEN are the two separate power-control
inputs for the receiver and transmitter. If both inputs
are at logic 0, the part enters shutdown mode, and
the supply current drops below 1µA. When one input
is brought to logic 1, the corresponding function is
enabled. If RXEN and TXEN are both set to logic 1, the
part enters standby mode, as described in the Standby
Mode section. Table 1 summarizes these operating
modes.
Standby mode
MX241A
at RF frequencies other than those specified in the AC
Electrical Characteristics table, it may be necessary to
design or alter the matching networks on the RF ports. If
the IF frequency is different from that specified in the AC
Electrical Characteristics table, the IF, IF matching net-
work mus t a ls o b e a lte re d . The Typ ic a l Op e ra ting
Characteristics provide port impedance data versus fre-
quency on all RF and IF ports for use in designing
matching networks. The LO port (LO and LO) is internal-
ly terminated with 50Ω resistors and provides a VSWR of
approximately 1.2:1 to 2GHz and 2:1 up to 3GHz.
Power-down is guaranteed with a control voltage at or
below 0.6V. The power-down function is designed to
reduce the total power consumption to less than 1µA in
less than 2.5µs. Complete power-up happens in the
same amount of time.
La yo u t Is s u e s
A p rop e rly d e s ig ne d PC b oa rd is e s s e ntia l to a ny
RF/microwave circuit. Be sure to use controlled imped-
ance lines on all high-frequency inputs and outputs.
Use low-inductance connections to ground on all GND
Standby Mode
When the TXEN and RXEN pins are both set to logic 1,
all functions are disabled, and the supply current drops
to 160µA (typ); this mode is called Standby. This mode
corresponds to a standby mode on the compatible IF
transceiver chips MAX2510 and MAX2511.
pins, and place decoupling capacitors close to all V
CC
connections.
For the power supplies, a star topology works well.
__________Ap p lic a t io n s In fo rm a t io n
Each V
node in the circuit has its own path to the
CC
Ex t e n d e d Fre q u e n c y Ra n g e
The MAX2411A has been characterized at 1.9GHz for
use in PCS-band applications. However, it operates
over a much wider frequency range. The LNA gain and
noise figure, PA driver gain, and mixer conversion gain
are plotted over a wide frequency range in the Typical
Operating Characteristics. When operating the device
central V and a decoupling capacitor that provides a
low impedance at the RF frequency of interest. The
CC
central V
node has a large decoupling capacitor
CC
a s we ll. This p rovid e s g ood is ola tion b e twe e n the
different sections of the MAX2411A. The MAX2411A
EV kit layout can be used as a guide to integrating the
MAX2411A into your design.
10 ______________________________________________________________________________________
Lo w -Co s t RF Up /Do w n c o n ve rt e r
w it h LNA a n d PA Drive r
MX241A
_________________________________________Typ ic a l Ap p lic a t io n Blo c k Dia g ra m
RF BPF
MATCH
IF
LNAIN
IF
MATCH
ANTENNA
IF
IF BPF
T/R
TXEN
RXEN
POWER
MANAGEMENT
RF BPF
LO
LO
LOCAL
OSCILLATOR
MAX2411
PA DRIVER
PA
MATCH
PADROUT
RF BPF
GC
MATCH
RF BPF
______________________________________________________________________________________ 11
Lo w -Co s t RF Up /Do w n c o n ve rt e r
w it h LNA a n d PA Drive r
___________________________________________________Typ ic a l Op e ra t in g Circ u it
1
28
GND
GND
220pF
220pF
220pF
LNA INPUT
(1.9GHz)
2
3
27
26
LNA
OUTPUT
LNAIN
GND
LNAOUT
GND
1pF
4
25
GND
GND
MX241A
V
CC
3.9nH
Rx MIXER
INPUT (1.9GHz)
5
24
23
V
CC
RXMXIN
GND
MAX2411A
47pF
V
CC
27nH
7
8
1000pF
27nH
27nH
LO INPUT
LO
LO
22
21
IF
IF
220pF
1000pF
400MHz
V
CC
V
CC
1000pF
IF SAW
FILTER
(200Ω)
10
27nH
V
CC
47pF
20
1000pF
GND
GND
GND
V
CC
17
18
1000pF
220pF
18nH
V
CC
PA OUTPUT
(1.9GHz)
13
12
14
PADROUT
GND
1000pF
5.6nH
GND
220pF
3.9nH
Tx MIXER
OUTPUT
(1.9GHz)
19
TXMXOUT
9
6
TXEN
RXEN
GC
TXEN
RXEN
GC
220pF
16
15
PA DRIVER
INPUT
11
PADRIN
GND
12 ______________________________________________________________________________________
Lo w -Co s t RF Up /Do w n c o n ve rt e r
w it h LNA a n d PA Drive r
MX241A
P a c k a g e In fo rm a t io n
______________________________________________________________________________________ 13
Lo w -Co s t RF Up /Do w n c o n ve rt e r
w it h LNA a n d PA Drive r
NOTES
MX241A
14 ______________________________________________________________________________________
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