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19-1872; Rev 1; 4/02
KIT ATION EVALU E AILABL AV
1575MHz/1900MHz Variable-IP3 Low-Noise Amplifiers
Features
o Low Noise Figure MAX2654: 1.5dB at 1575MHz MAX2655: 1.45dB at 1575MHz MAX2656: 1.9dB at 1960MHz o High Gain MAX2654: 15.1dB at 1575MHz MAX2655: 14.1dB at 1575MHz MAX2656: 13.5dB at 1960MHz o 12.7dB Gain Step (MAX2656 only) o Integrated 50 Output Matching o Variable IP3 Set by One Bias Resistor (MAX2655/MAX2656 only) o 0.1A Shutdown Mode (MAX2654/MAX2655 only) o +2.7V to +5.5V Single-Supply Operation o Ultra-Small 6-Pin SC70 Package
General Description
The MAX2654/MAX2655/MAX2656 high third-order intercept point (IP3), low-noise amplifiers (LNAs) are designed for applications in GPS, PCS, WLL, and satellite phone systems. The MAX2654/MAX2655/MAX2656 incorporate on-chip internal output matching to 50, eliminating the need for external matching components. A shutdown feature in the MAX2654/MAX2655 reduces the operating current to 0.1A, eliminating the need for an external supply switch. The MAX2654 operates in the GPS frequency of 1575MHz with 15.1dB of gain, 1.5dB noise figure, and only consumes 5.8mA. The MAX2655 is designed with high-input IP3 to improve operation in cellular applications where the cellular power amplifier leaks into the GPS receiver. The MAX2656 is designed for PCS phone applications with 13.5dB of gain in high-gain mode and 0.8dB of gain in low-gain mode (selected by a logic control) and 1.9dB noise figure. The IP3 of MAX2655/MAX2656 is adjustable by a single external bias resistor (RBIAS), allowing supply current to be optimized for a specific application. The MAX2654/MAX2655/MAX2656 operate from a +2.7V to +5.5V single supply and are available in the miniature 6-pin SC70 package.
MAX2654/MAX2655/MAX2656
Ordering Information
PART MAX2654EXT-T MAX2655EXT-T MAX2656EXT-T TEMP RANGE -40C to +85C -40C to +85C -40C to +95C PINPACKAGE 6 SC70-6 6 SC70-6 6 SC70-6 SOT TOPMARK AAI AAJ AAK
________________________Applications
GPS Receivers GPS Receivers in Cellular Phones DCS/PCS Cellular Phones Satellite Phones Wireless Local Loop
Typical Operating Circuit
VCC = +3V Cb
Pin Configuration
BIAS (GND) 1 6 RFOUT
MAX2655 MAX2656
1 RBIAS
4
BIAS
VCTRL/GND
GND
2
MAX2654 MAX2655 MAX2654
10k
5
GND
RFIN C1 C2
L1
3
6 RFOUT
RFIN
3
4
VCC
SC70-6
ARE FOR MAX2654 ONLY
(1) ( ) ARE FOR MAX2654 ONLY
2
5
PART MAX2654 MAX2655 MAX2656
FREQUENCY 1575 1575 1960
L1 (nH) 5.6 5.6 4.7
C1 (pF) 6 1800 1800
C2 (pF) 1.6 1.5 1.2
________________________________________________________________ Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim's website at www.maxim-ic.com.
1575MHz/1900MHz Variable-IP3 Low-Noise Amplifiers MAX2654/MAX2655/MAX2656
ABSOLUTE MAXIMUM RATINGS
VCC to GND .............................................................-0.3V to +6V RF Input Power .................................................................+5dBm Continuous Power Dissipation (TA = +70C) 6-Pin SC70 (derate 3.1mW/C above +70C) ..............245mW Operating Temperature Range ...........................-40C to +85C Maximum Junction Temperature .....................................+150C Storage Temperature.........................................-65C to +150C Lead Temperature (soldering, 10s) .................................+300C
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.
DC ELECTRICAL CHARACTERISTICS
(VCC = +2.7V to +5.5V, RBIAS = 511 1%, TA = -40C to +85C. No RF signal applied. RFIN is AC-coupled and terminated to 50. RFOUT is unconnected. Typical values are at VCC = +3V, TA = +25C, unless otherwise noted.) (Note 1)
PARAMETER Supply Voltage Operating Supply Current (MAX2654 only) VRFOUT = VCC VRFOUT = GND TA = +25C TA = -40C to +85C TA = +25C TA = -40C to +85C RBIAS = 511 1% VRFOUT = VCC TA = +25C RBIAS = 698 1% RBIAS = 357 1% RBIAS = 511 1%, TA = -40C to +85C TA = +25C TA = -40C to +85C RBIAS = 511 1% Operating Supply Current (MAX2656 only) VRFOUT = GND TA = +25C RBIAS = 715 1% RBIAS = 511 1%, TA = +85C TA = +25C TA = +85C 2 0.6 15.6 71 1 -24 11.5 8.5 13.6 12.3 14.6 mA V V A A 0.1 8.3 5.9 10.1 11.1 1 2.2 15.2 mA A mA 0.1 CONDITIONS MIN 2.7 5.8 TYP MAX 5.5 8.2 9.2 1 2.1 10 UNIT V mA A
Operating Supply Current (MAX2655 only)
VRFOUT = GND
VRFOUT = VCC Input Logic High at VRFOUT Input Logic Low at VRFOUT Input Logic High Current at VRFOUT (Note 4) Input Logic Low Current at VRFOUT (Note 5) (Note 2) (Note 3) MAX2654/MAX2655 MAX2656 MAX2654/MAX2655 MAX2656
2
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1575MHz/1900MHz Variable-IP3 Low-Noise Amplifiers
AC ELECTRICAL CHARACTERISTICS (MAX2654)
(MAX2654 Evaluation Kit, VCC = +3.0V, PIN = -30dBm, fIN = 1575MHz, VRFOUT = VCC through a 10k resistor, TA = +25C. Typical values are at VCC = +3V, TA = +25C, unless otherwise noted.) (Note 6)
PARAMETER Operating Frequency Range (Note 7) Gain Gain Variation Over Temperature Input Third-Order Intercept Point (Note 9) Input 1dB Compression Point Noise Figure (Note 10) Input Return Loss Output Return Loss Reverse Isolation (Note 8) TA = -40C to +85C CONDITIONS MIN 1400 12.7 15.1 0.15 -7.2 -18 1.5 9.7 8.4 30 1.8 1 TYP MAX 1700 UNIT MHz dB dB dBm dBm dB dB dB dB
MAX2654/MAX2655/MAX2656
AC ELECTRICAL CHARACTERISTICS (MAX2655)
(MAX2655 Evaluation Kit, VCC = +3.0V, PIN = -30dBm, fIN = 1575MHz, VRFOUT = VCC through a 10k resistor, RBIAS = 511 1%, TA = +25C. Typical values are at VCC = +3V, TA = +25C, unless otherwise noted.) (Note 6)
PARAMETER Operating Frequency Range (Note 7) Gain Gain Variation Over Temperature Input Third-Order Intercept Point (Note 9) Input 1dB Compression Point Noise Figure (Note 10) Input Return Loss Output Return Loss Reverse Isolation (Note 8) TA = -40C to +85C RBIAS = 511 1% RBIAS = 698 1% RBIAS = 357 1% CONDITIONS MIN 1400 12 14.1 0.6 2.8 2.2 3.8 -12.2 1.45 16.1 15.5 32 1.9 dBm dB dB dB dB dBm 1.1 TYP MAX 1700 UNIT MHz dB dB
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1575MHz/1900MHz Variable-IP3 Low-Noise Amplifiers MAX2654/MAX2655/MAX2656
AC ELECTRICAL CHARACTERISTICS (MAX2656)
(MAX2656 Evaluation Kit, VCC = +3V, PIN = -30dBm, fIN = 1960MHz, VRFOUT = GND through a 12k resistor, RBIAS = 511 1%, TA = +25C. Typical values are at VCC = +3V, TA = +25C, unless otherwise noted.) (Note 6)
PARAMETER Operating Frequency Range (Note 7) Gain, High-Gain Mode Gain, Low-Gain Mode Gain Variation Over Temperature Gain Step Input Third-Order Intercept Point (Note 13) Input 1dB Compression Point Noise Figure (Note 10) Input Return Loss Output Return Loss Reverse Isolation Gain Step Response Time RBIAS = 511 1% RBIAS = 715 1% Low-gain mode (Note 12) High-gain mode (Note 11) Low-gain mode (Note 12) High-gain mode (Note 11) Low-gain mode (Note 12) High-gain mode (Note 11) Low-gain mode (Note 12) High-gain mode (Note 11) Low-gain mode (Note 12) High-gain mode (Note 11) Low-gain mode (Note 12) (Note 11) (Note 12) TA = -40C to +85C CONDITIONS MIN 1800 12 13.5 0.8 0.3 12.7 1.5 -3 7.2 -7 -1.2 1.9 10.8 14.4 19.3 10.7 7.3 28 25 3.2 2.4 dBm dB dB dB dB s dBm 1.2 TYP MAX 2000 UNIT MHz dB dB dB dB
Note 1: Devices are production tested at TA = +25C. Minimum and maximum values are guaranteed by design and characterization over temperature and supply voltages to 6 sigma. Note 2: Minimum DC voltage through a 10k resistor that sets the MAX2654/MAX2655 to operate in normal mode and MAX2656 in low-gain mode. Note 3: Maximum DC voltage through a 10k resistor that sets the MAX2654/MAX2655 to operate in shutdown mode and MAX2656 in high-gain mode. Note 4: DC current required when VRFOUT is connected to VCC through a 10k resistor. Note 5: DC current required when VRFOUT is connected to GND through a 10k resistor. Note 6: Guaranteed by design and characterization to 3 sigma. Note 7: The part has been characterized at the specified frequency range. Operation outside of this range is possible, but not guaranteed. Note 8: Production tested at TA = +25C. Note 9: Measured with two input tones, f1 = 1570MHz, f2 = 1580MHz, both at -30dBm per tone. Note 10: Excludes PC board losses of 0.2dB for MAX2654/MAX2655 and 0.25dB for MAX2656. Note 11: High-gain mode is set up by connecting RFOUT to GND through a 12k resistor. Note 12: Low-gain mode is set up by connecting RFOUT to VCC through a 12k resistor. Note 13: Measured with two input tones, f1 = 1955MHz, f2 = 1965MHz, both at -30dBm per tone.
4
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1575MHz/1900MHz Variable-IP3 Low-Noise Amplifiers
Typical Operating Characteristics
(PIN = -30dBm, input and output are terminated to 50, VCC = +3V, high-gain and low-gain modes are applicable only to the MAX2656, TA = +25C, unless otherwise noted.)
MAX2654 SUPPLY CURRENT vs. SUPPLY VOLTAGE
MAX2654 toc01
MAX2654/MAX2655/MAX2656
MAX2654 SHUTDOWN CURRENT vs. TEMPERATURE
14 SHUTDOWN CURRENT (A) 12 10 8 6 4 2 0 VCC = +3V -40 -20 0 20 40 60 80 0.5 VCC = +6V
MAX2654 toc02
MAX2654 INPUT LOGIC VOLTAGE vs. TEMPERATURE
INPUT LOGIC HIGH AT VRFOUT INPUT LOGIC VOLTAGE (V)
MAX2654 toc03
8 7 SUPPLY CURRENT (mA) 6 5 4 3 TA = +25C 2 1 0 2 3 4 SUPPLY VOLTAGE (V) 5 6 TA = -40C TA = +85C
2.0
1.5
INPUT LOGIC LOW AT VRFOUT 1.0
-40
-20
0
20
40
60
80
TEMPERATURE (C)
TEMPERATURE (C)
MAX2654 INPUT LOGIC CURRENT vs. TEMPERATURE
MAX2654 toc04
MAX2654 INPUT LOGIC CURRENT vs. TEMPERATURE
MAX2654 toc05
MAX2654 INPUT IP3 vs. TEMPERATURE
f1 = 1570 MHz f2 = 1580 MHz
MAX2654 toc06
8 INPUT LOGIC HIGH AT VRFOUT INPUT LOGIC CURRENT (A) 7
60 INPUT LOGIC LOW AT VRFOUT INPUT LOGIC CURRENT (A) 55
-6
-7 INPUT IP3 (dBm)
6
50
-8
4
45
-9
0 -40 -20 0 20 40 60 80 TEMPERATURE (C)
40 -40 -20 0 20 40 60 80 TEMPERATURE (C)
-10 -40 -20 0 20 40 60 80 TEMPERATURE (C)
MAX2654 GAIN vs. FREQUENCY
MAX2654 toc07
MAX2654 GAIN vs. SUPPLY VOLTAGE
MAX2654 toc08
MAX2654 NOISE FIGURE vs. FREQUENCY
3.0 2.8 NOISE FIGURE (dB) 2.6 2.4 2.2 2.0
MAX2654 toc09
16 14 12 GAIN (dB)
15
3.2
14 TA = +85C TA = +25C TA = -40C
8 6 4 2 0 1000 1200 1400 1600 1800 2000 2200 FREQUENCY (MHz)
GAIN (dB)
10
13
12
11 1.8 10 f0 = 1575MHz 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 1.6 1000 1200 1400 1600 1800 2000 FREQUENCY (MHz)
SUPPLY VOLTAGE (V)
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1575MHz/1900MHz Variable-IP3 Low-Noise Amplifiers MAX2654/MAX2655/MAX2656
Typical Operating Characteristics (continued)
(PIN = -30dBm, input and output are terminated to 50, VCC = +3V, high-gain and low-gain modes are applicable only to the MAX2656, TA = +25C, unless otherwise noted.)
MAX2654 NOISE FIGURE vs. TEMPERATURE
MAX2654 toc10
MAX2654 INPUT/OUTPUT RETURN LOSS vs. FREQUENCY
MAX2654 toc11
MAX2654 REVERSE ISOLATION vs. FREQUENCY
-25 REVERSE ISOLATION (dB) -30 -35 -40 -45 -50 -55
MAX2654 toc12
2.4 2.2 NOISE FIGURE (dB) 2.0 1.8 1.6 1.4 1.2 1.0
fIN = 1575MHz
0 OUTPUT RETURN LOSS INPUT/OUTPUT RETURN LOSS (dB) -2 INPUT RETURN LOSS -4
-20
-6
-8
-10 -40 -20 0 20 40 60 80 1000 1200 1400 1600 1800 FREQUENCY (MHz) 2000 2200 TEMPERATURE (C)
-60 1000 1200 1400 1600 1800 2000 2200 FREQUENCY (MHz)
MAX2654 OUTPUT POWER vs. INPUT POWER
8 6 4 2 0 -2 -4 -6 -8 -10 -12 -14 -16 -30 -26 -22 -18 -14 -10 -6 -2 2 INPUT POWER (dBm)
MAX2654 toc13
MAX2654 P1dB vs. TEMPERATURE
MAX2654 toc14
MAX2654 SHUTDOWN TIME
-10 -20 OUTPUT POWER (dBm) -30 -40 -50 -60 -70 -80 -90 2.8s US
MAX2655 toc15
-17 fIN = 1575MHz -18
0
OUTPUT POWER (dBm)
P1dB (dBm)
-19
-20
-21
-22 -40 -20 0 20 40 60 80 TEMPERATURE (C)
-100 0 1.0 2.0 TIME (s) 3.0 4.0
MAX2655 SUPPLY CURRENT vs. SUPPLY VOLTAGE
MAX2655 toc16
MAX2655 SUPPLY CURRENT vs. SUPPLY VOLTAGE
MAX2655 toc17
MAX2655 SUPPLY CURRENT vs. SUPPLY VOLTAGE
RBIAS = 357 1%
MAX2655 toc18
8 7 SUPPLY CURRENT (mA) 6 5 4 3 2 1 0 2
10 9 8 SUPPLY CURRENT (mA) 7 6 5 4 3 2 1 0
RBIAS = 698 1%
RBIAS = 511 1%
14 12 SUPPLY CURRENT (mA) 10 8
TA = +85C TA = +25C TA = -40C
TA = +85C TA = +25C TA = -40C
TA = +85C 6 4 TA = -40C 2 0 TA = +25C
3
4 SUPPLY VOLTAGE (V)
5
6
2
3
4 SUPPLY VOLTAGE (V)
5
6
2
3
4 5 SUPPLY VOLTAGE (V)
6
6
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1575MHz/1900MHz Variable-IP3 Low-Noise Amplifiers MAX2654/MAX2655/MAX2656
Typical Operating Characteristics (continued)
(PIN = -30dBm, input and output are terminated to 50, VCC = +3V, high-gain and low-gain modes are applicable only to the MAX2656, TA = +25C, unless otherwise noted.)
MAX2655 SUPPLY CURRENT vs. RBIAS
MAX2655 toc19
MAX2655 SHUTDOWN CURRENT vs. TEMPERATURE
28 SHUTDOWN CURRENT (nA) 24 20 16 12 8 4 0 VCC = +3V VCC = +6V
MAX2655 toc20
MAX2655 INPUT LOGIC VOLTAGE vs. TEMPERATURE
INPUT LOGIC HIGH AT VRFOUT INPUT LOGIC VOLTAGE (V)
MAX2655 toc21
16 14 SUPPLY CURRENT (mA) 12 10 8 6 4 2 0 200 400 600 TA = -40C TA = +25C TA = +85C
2.0
1.5
1.0
INPUT LOGIC LOW AT VRFOUT
0.5 -40 -20 0 20 40 60 80 -40 -20 0 20 40 60 80 TEMPERATURE (C) TEMPERATURE (C)
800 1000 1200 1400 1600 RBIAS ()
MAX2655 INPUT LOGIC CURRENT vs. TEMPERATURE
MAX2655 toc22
8 6 INPUT IP3 (dBm) 4 2 0 -2 -4
9 INPUT LOGIC CURRENT (A) 8 7 6 5 4 -40 -20 0 20 40 TEMPERATURE (C) 60 80 INPUT LOGIC LOW AT VRFOUT INPUT LOGIC HIGH AT VRFOUT
PIN = -30dBm f1 = 1570MHz f2 = 1580MHz TA = +85C
MAX2655 toc23
14 12 10 GAIN (dB) 8 6 RBIAS = 511 1% RBIAS = 357 1%
-6 -8 -10 200 400 600
TA = +25C TA = -40C 800 1000 1200 1400 1600 TEMPERATURE (C)
4 2 0 1000 1200 1400 1600 1800 2000 2200 FREQUENCY (MHz) RBIAS = 698 1%
MAX2655 GAIN vs. RBIAS
MAX2655 toc25
MAX2655 GAIN vs. SUPPLY VOLTAGE
MAX2655 toc26
MAX2655 NOISE FIGURE vs. FREQUENCY
3.2 3.0 NOISE FIGURE (dB) 2.8 2.6 2.4 2.2 2.0 1.8 1.6 1.4 RBIAS = 357 1% RBIAS = 511 1% RBIAS = 698 1%
MAX2655 toc27
18 17 16 15 GAIN (dB) 14 13 12 11 10 9 8
fIN = 1575MHz
15
3.4
14 TA = -40C TA = +25C GAIN (dB) 13 TA = +85C
TA = -40C
TA = +85C TA = +25C
12
11
fIN = 1575MHz RBIAS = 511 1%
10 200 400 600 800 1000 1200 1400 1600 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 RBIAS () SUPPLY VOLTAGE (V)
1000
1200
1400
1600
1800
2000
FREQUENCY (MHz)
_______________________________________________________________________________________
MAX2655 toc24
10
MAX2655 INPUT IP3 vs. RBIAS
10
MAX2655 GAIN vs. FREQUENCY
16
7
1575MHz/1900MHz Variable-IP3 Low-Noise Amplifiers MAX2654/MAX2655/MAX2656
Typical Operating Characteristics (continued)
(PIN = -30dBm, input and output are terminated to 50, VCC = +3V, high-gain and low-gain modes are applicable only to the MAX2656, TA = +25C, unless otherwise noted.)
MAX2655 NOISE FIGURE vs. TEMPERATURE
fIN = 1575MHz RBIAS = 511 1%
MAX2655 toc28
MAX2655 INPUT/OUTPUT RETURN LOSS vs. FREQUENCY
MAX2655 toc29
MAX2655 REVERSE ISOLATION vs. FREQUENCY
-25 REVERSE ISOLATION (dB) -30 -35 -40 -45 -50 -55 -60 1000 1200 1400 1600 1800 2000 FREQUENCY (MHz) 2200
MAX2655 toc30
2.0
0 INPUT/OUTPUT RETURN LOSS (dB) -4 -8 -12 -16 -20 INPUT RETURN LOSS -24 1000 1200 1400 1600 1800 2000 2200 FREQUENCY (MHz)
-20
1.8 NOISE FIGURE (dB)
OUTPUT RETURN LOSS
1.6
1.4
1.2
1.0 -40 -20 0 20 40 60 80 TEMPERATURE (C)
MAX2655 SHUTDOWN TIME
MAX2655 toc31
MAX2655 OUTPUT POWER vs. INPUT POWER
MAX2655 toc32
MAX2655 P1dB vs. RBIAS
-9 -10 -11 P1dB (dBm) -12 -13 -14 -15 -16 -17 -18 TA = -40C TA = +25C TA = +85C fIN = 1575MHz
MAX2655 toc33
0 -10 -20 OUTPUT POWER (dBm) -30 -40 -50 -60 -70 -80 -90 -100 0 1.0 2.0 3.0 4.0 5.0 6.0 7.0 5.8s
12 fIN = 1575MHz 8 OUTPUT POWER (dBm) 4 0 RBIAS = 511 1% -4 -8 -12 -16
-8
RBIAS = 357 1%
RBIAS = 698 1%
8.0
-30 -26 -22
-18
-14
-10
-6
-2
2
200
400
600
800
1000 1200 1400 1600
TIME (us)
INPUT POWER (dBm)
RBIAS ()
MAX2656 SUPPLY CURRENT vs. SUPPLY VOLTAGE
9 8 SUPPLY CURRENT (mA) 7 6 5 4 3 2 1 0 2 3 4 SUPPLY VOLTAGE (V) 5 6 RBIAS = 715 1% HIGH-GAIN MODE TA = -40C TA = +25C TA = +85C
MAX2654 toc34
MAX2656 SUPPLY CURRENT vs. SUPPLY VOLTAGE
MAX2654 toc35
MAX2656 SUPPLY CURRENT vs. SUPPLY VOLTAGE
16 14 SUPPLY CURRENT (mA) 12 10 8 6 4 TA = +25C TA = -40C TA = +85C
MAX2654 toc36
10
14 TA = +85C 12 SUPPLY CURRENT (mA) 10 8 6 4 2 0 2 3 4 SUPPLY VOLTAGE (V) 5 6 RBIAS = 511 1% HIGH-GAIN MODE TA = +25C TA = -40C
18
2 0 2
RBIAS = 392 1% HIGH-GAIN MODE 3 4 SUPPLY VOLTAGE (V) 5 6
8
_______________________________________________________________________________________
1575MHz/1900MHz Variable-IP3 Low-Noise Amplifiers MAX2654/MAX2655/MAX2656
Typical Operating Characteristics (continued)
(PIN = -30dBm, input and output are terminated to 50, VCC = +3V, high-gain and low-gain modes are applicable only to the MAX2656, TA = +25C, unless otherwise noted.)
MAX2656 SUPPLY CURRENT vs. SUPPLY VOLTAGE
MAX2654 toc37
MAX2656 SUPPLY CURRENT vs. SUPPLY VOLTAGE
MAX2654 toc38
MAX2656 SUPPLY CURRENT vs. SUPPLY VOLTAGE
18 16 SUPPLY CURRENT (mA) 14 12 10 8 6 4 RBIAS = 392 1% LOW-GAIN MODE 2 3 4 SUPPLY VOLTAGE (V) 5 6 TA = -40C TA = +25C TA = +85C
MAX2654 toc39
12 11 10 SUPPLY CURRENT (mA) 9 8 7 6 5 4 3 2 1 0 2 3
16 TA = +85C 14 SUPPLY CURRENT (mA) 12 10 8 6 4 2 0 RBIAS = 511 1% LOW-GAIN MODE 2 3 4 SUPPLY VOLTAGE (V) 5 6 TA = +25C
20
TA = +85C
TA = +25C
TA = -40C
TA = -40C
RBIAS = 715 1% LOW-GAIN MODE 4 SUPPLY VOLTAGE (V) 5 6
2 0
MAX2656 SUPPLY CURRENT vs. RBIAS
MAX2654 toc40
MAX2656 SUPPLY CURRENT vs. RBIAS
MAX2654 toc41
MAX2656 INPUT LOGIC VOLTAGE vs. TEMPERATURE
MAX2654 toc42
24 SUPPLY CURRENT (mA) 20 TA = +85C 16 12 8 4 TA = -40C 0 200 400 600 800
HIGH-GAIN MODE
24 SUPPLY CURRENT (mA) 20 TA = +85C 16 12 8 4 TA = -40C 0
LOW-GAIN MODE
2.0 INPUT LOGIC HIGH AT VRFOUT INPUT LOGIC VOLTAGE (V) 1.5
TA = +25C
TA = +25C
1.0 INPUT LOGIC LOW AT VRFOUT
0.5 200 400 600 800 1000 1200 1400 1600 -40 -20 0 20 40 60 80 RBIAS () TEMPERATURE (C)
1000 1200 1400 1600
RBIAS ()
MAX2656 INPUT LOGIC CURRENT vs. TEMPERATURE
MAX2654 toc43
MAX2656 INPUT IP3 vs. RBIAS
MAX2654 toc44
MAX2656 INPUT IP3 vs. RBIAS
10 8 INPUT IP3 (dBm) 6 4 2 0 -2 -4 -6 f1 = 1955MHz f2 = 1965MHz PIN = -20dBm 200 400 600 TA = -40C TA = +85C TA = +25C LOW-GAIN MODE
MAX2654 toc45
5 3 1 INPUT IP3 (dBm) -1 -3 -5 -7 -9 TA = +85C f1 = 1955MHz f2 = 1965MHz PIN = -20dBm 200 400 600 800 TA = +25C HIGH-GAIN MODE TA = -40C
12
INPUT LOGIC CURRENT (A)
10 INPUT LOGIC HIGH AT VRFOUT 0
-10
-20 INPUT LOGIC LOW AT VRFOUT -30 -40 -20 0 20 40 60 80 TEMPERATURE (C)
-11 -13 -15
1000 1200 1400 1600
800
1000 1200 1400 1600
RBIAS ()
RBIAS ()
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9
1575MHz/1900MHz Variable-IP3 Low-Noise Amplifiers MAX2654/MAX2655/MAX2656
Typical Operating Characteristics (continued)
(PIN = -30dBm, input and output are terminated to 50, VCC = +3V, high-gain and low-gain modes are applicable only to the MAX2656, TA = +25C, unless otherwise noted.)
MAX2656 GAIN vs. FREQUENCY
MAX2654 toc46
MAX2656 GAIN vs. FREQUENCY
MAX2654 toc47
MAX2656 GAIN vs. RBIAS
fIN = 1960MHz HIGH-GAIN MODE TA = -40C
MAX2654 toc48
16 14 12 10 GAIN (dB) 8 6 4 2 0
RBIAS = 392 1%
4 3 2 GAIN (dB) RBIAS = 392 1%
LOW-GAIN MODE
18 17 16 15 14 13 12 11 10 9 8 7 6
HIGH-GAIN MODE RBIAS = 511 1%
0 -1 -2 -3 -4
RBIAS = 511 1%
GAIN (dB)
1
RBIAS = 698 1%
TA = +25C
RBIAS = 715 1%
TA = +85C
1000 1200 1400
1600 1800
2000 2200
1000 1200 1400
1600 1800 2000 2200
200
400
600
800
1000 1200 1400 1600
FREQUENCY (MHz)
FREQUENCY (MHz)
RBIAS ()
MAX2656 GAIN vs. RBIAS
MAX2654 toc49
MAX2656 GAIN vs. SUPPLY VOLTAGE
MAX2654 toc50
MAX2656 GAIN vs. SUPPLY VOLTAGE
RBIAS = 511 1% f1 = 1960MHz HIGH-GAIN MODE 15.5 GAIN (dB)
MAX2654 toc51
4 3 2 GAIN (dB) 1 0 -1
fIN = 1960MHz LOW-GAIN MODE
3
RBIAS = 511 1% fIN = 1960MHz T = -40C LOW-GAIN MODE A
16.0
TA = -40C GAIN (dB)
2 15.0 TA = -40C TA = +25C
TA = +25C 1 TA = +85C
TA = +25C TA = +85C
14.5
TA = +85C
-2 200 400 600 800 1000 1200 1400 1600 RBIAS ()
0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 SUPPLY VOLTAGE (V)
14.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 SUPPLY VOLTAGE (V)
MAX2656 NOISE FIGURE vs. FREQUENCY
MAX2654 toc52
MAX2656 NOISE FIGURE vs. TEMPERATURE
MAX2654 toc53
MAX2656 INPUT/OUTPUT RETURN LOSS vs. FREQUENCY
LOW-GAIN MODE OUTPUT RETURN LOSS
MAX2654 toc54
2.4
2.4 2.2 2.0 1.8 1.6 1.4 1.2 f1 = 1960MHz RBIAS = 511 1%
0 -2 INPUT/OUTPUT RETURN LOSS (dB) -4 -6 -8 -10 -12 -14 -16 -18
2.2 NOISE FIGURE (dB) RBIAS = 392 1% 2.0 RBIAS = 715 1% 1.8 RBIAS = 511 1%
NOISE FIGURE (dB)
INPUT RETURN LOSS
1.6
1.4 1500 1600 1700 1800 1900 2000 2100 2200 2300 FREQUENCY (MHz)
1.0 -40 -20 0 20 40 60 80 TEMPERATURE (C)
-20 -22 -24 1000 1200 1400
1600 1800 2000
2200
FREQUENCY (MHz)
10
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1575MHz/1900MHz Variable-IP3 Low-Noise Amplifiers MAX2654/MAX2655/MAX2656
Typical Operating Characteristics (continued)
(PIN = -30dBm, input and output are terminated to 50, VCC = +3V, high-gain and low-gain modes are applicable only to the MAX2656, TA = +25C, unless otherwise noted.)
MAX2656 INPUT/OUTPUT RETURN LOSS vs. FREQUENCY
MAX2654 toc55
MAX2656 REVERSE ISOLATION vs. FREQUENCY
MAX2654 toc56
MAX2656 GAIN STEP TIME FROM LOW TO HIGH
MAX2654 toc57
0 INPUT/OUTPUT RETURN LOSS (dB) -2 -4 -6 -8 -10 -12
HIGH-GAIN MODE
-20 -25 REVERSE ISOLATION (dB) -30 -35 -40 -45 -50 -55 -60 1000 1200 1400 HIGH-GAIN MODE LOW-GAIN MODE
-10 -15 OUTPUT POWER (dBm) -20 -25 -30 2.0s -35 -40
OUTPUT RETURN LOSS
INPUT RETURN LOSS
-14 1000
1200 1400
1600 1800 2000
2200
1600 1800 2000
2200
0
1.0
2.0 TIME (s)
3.0
4.0
FREQUENCY (MHz)
FREQUENCY (MHz)
MAX2656 GAIN STEP TIME FROM HIGH TO LOW
MAX2654 toc58
MAX2656 OUTPUT POWER vs. INPUT POWER
10 8 6 4 2 0 -2 -4 -6 -8 -10 -12 -14 -16 -18 -20
MAX2654 toc59
MAX2656 OUTPUT POWER vs. INPUT POWER
-2 OUTPUT POWER (dBm) -6 -10 -14 -18 -22 -26 -30 RBIAS = 715 1% RBIAS = 511 1% RBIAS = 392 1% fIN = 1960MHz LOW-GAIN MODE
MAX2654 toc60
-10 -15 OUTPUT POWER (dBm) -20 -25 -30 2.0s -35 -40 0 1.0 2.0 TIME (s) 3.0
2
fIN = 1960MHz HIGH-GAIN MODE RBIAS = 392 1% RBIAS = 715 1% RBIAS = 511 1%
OUTPUT POWER (dBm)
4.0
-30
-25
-20
-15
-10
-5
0
-30
-25
-20
-15
-10
-5
0
INPUT POWER (dBm)
INPUT POWER (dBm)
MAX2656 P1dB vs. RBIAS
2 0 P1dB (dBm) -2 -4 -6 -8 -10 200 400 600 800 1000 1200 1400 1600 RBIAS () TA = +25C TA = +85C P1dB (dBm) fIN = 1960MHz LOW-GAIN MODE
MAX2654 toc61
MAX2656 P1dB vs. RBIAS
2 0 -2 -4 -6 TA = +85C -8 -10 -12 200 400 600 800 1000 1200 1400 1600 RBIAS () TA = +25C TA = -40C fIN = 1960MHz HIGH-GAIN MODE
MAX2654 toc62
4
4
TA = +40C
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11
1575MHz/1900MHz Variable-IP3 Low-Noise Amplifiers MAX2654/MAX2655/MAX2656
Pin Description
PIN MAX2654 1 2, 5 --- 3 4 MAX2655/ MAX2656 --- 2, 5 1 3 4 NAME GND GND BIAS RFIN VCC DESCRIPTION Ground. Connect to the PC board ground plane through a 0.017in x 0.035in line. Ground. Connect to the PC board ground plane with as low an inductance path as possible. Bias Control. Connect a resistor RBIAS from BIAS to GND. RBIAS sets IP3 and supply current. Amplifier Input. Requires a DC-blocking capacitor and external matching components. Supply Voltage. Bypass to ground with an appropriate capacitor as close to the IC as possible. Refer to MAX2654/MAX2655/MAX2656 EV kits for capacitor values. RF Output. Incorporates an internal DC-blocking capacitor. RFOUT is internally matched to 50. DC bias on this pin selects gain mode (MAX2656) or shutdown mode (MAX2654/MAX2655) (see Applications Information).
6
6
RFOUT
Detailed Description
The MAX2654/MAX2655/MAX2656 are low-noise amplifiers designed for applications in GPS receivers, satellite and PCS phones. The MAX2655/MAX2656 feature variable IP3s, adjusted by a single external bias resistor. Another feature of the MAX2654/MAX2655 is a power shutdown control mode, eliminating the need for an external supply switch. The MAX2656 features a high- and low-gain control mode selected by an external logic control.
Table 1. RBIAS vs. IP3 for MAX2655
RBIAS () 698 357 IP3 (dBm) 2.2 3.8 ICC (mA) 5.8 10.1
Table 2. RBIAS vs. IP3 for MAX2656
RBIAS () 715 511 IP3 (dBm) -3 1.5 ICC (mA) 8.5 11.5
Input and Output Ports
The MAX2654/MAX2655/MAX2656 incorporate on-chip matching networks to 50 at the output ports, eliminating the need for external matching components. (For MAX2655, a shunt inductor is recommended for best output return loss. Refer to the MAX2655 EV kit schematic.) The MAX2654/MAX2655/MAX2656 require simple matching networks at the input ports. The values of these matching components are recommended in the Typical Operating Circuit.
Gain-Step Control (MAX2656)
The DC bias voltage at RFOUT of the MAX2656 serves as a gain-step control input. When the applied DC voltage at RFOUT through a 10k resistor is less than +0.6V, the device is in high-gain mode. When the applied DC voltage is greater than +2.0V, the device gain is attenuated by 13dB. A standard logic output can be applied as shown in the Typical Operating Circuit.
Variable IP3
The IP3 of MAX2655 and MAX2656 is adjusted through an external resistor (RBIAS). Tables 1 and 2 summarize the values of RBIAS for different IP3s for MAX2655 and MAX2656.
Shutdown-Enable (MAX2654/MAX2655)
The DC bias voltage at RFOUT of the MAX2654/ MAX2655 serves as a shutdown enable input. When the applied DC voltage at RFOUT through a 10k resistor is less than +0.6V, the device is in shutdown mode. When the DC voltage is greater than +2V, the device is enabled.
12
______________________________________________________________________________________
1575MHz/1900MHz Variable-IP3 Low-Noise Amplifiers
Applications Information
Input Matching
For optimum performance, input matching is required. The MAX2654/MAX2655/MAX2656 require a simple LC matching network. The Typical Operating Circuit shows the recommended input matching networks. These values are optimized for best simultaneous gain, noise figure, and return loss performance. S-Parameter data can be found on the Maxim website at www.maxim-ic.com. long VCC lines, it may be necessary to add decoupling capacitors. Locate these additional capacitors further away from the device package. Proper grounding of the GND pins is essential. If the PC board uses a topside RF ground, connect it directly to all GND pins. For a board where the ground plane is not on the component layer, connect the GND pins to the board with a multiple vias close to the package. For MAX2654, connect Pin1 to the PC board ground plane through a 0.017in x 0.035in line.
MAX2654/MAX2655/MAX2656
Layout Issues
A properly designed PC board is essential to any RFmicrowave circuit. Use controlled impedance lines on all high-frequency inputs and outputs. Bypass VCC with decoupling capacitors located close to the device. For
Chip Information
TRANSISTOR COUNT: 135 (Same for MAX2654, MAX2655, MAX2656)
______________________________________________________________________________________
13
1575MHz/1900MHz Variable-IP3 Low-Noise Amplifiers MAX2654/MAX2655/MAX2656
Package Information
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information, go to www.maxim-ic.com/packages.)
SC70, 6L.EPS
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
14 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 (c) 2000 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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