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19-1524; Rev 2; 11/99
NUAL KIT MA ATION ET EVALU TA SHE WS DA FOLLO
2.7V, Single-Supply, Cellular-Band Linear Power Amplifiers
Features
o Low Average CDMA Current Consumption in Typical Urban Scenario 55mA (MAX2264) 90mA (MAX2265) 40mA (MAX2266) o 0.5A Shutdown Mode Eliminates External Supply Switch o 0.8dB Gain Variation Over Temperature o No External Reference or Logic Interface Circuitry Needed o Supply Current and ACPR Margin Dynamically Adjustable o +2.7V to +5V Single-Supply Operation o 37% Efficiency at +2.7V Operation
General Description
The MAX2264/MAX2265/MAX2266 power amplifiers are designed for operation in IS-98-based CDMA, IS-136based TDMA, and PDC cellular telephones operating in the 900MHz range. When matched for CDMA operation and biased with margin over the adjacent and alternate channel specification (-45dBc/-56dBc), the amplifiers achieve 28dBm output power with 37% efficiency (MAX2265). At +16dBm output--a very common power level for CDMA phones--the MAX2265 still has 7% efficiency, yielding excellent overall talk time. At the same power level, the MAX2264/MAX2266 have an unprecedented 12%/17% efficiency, while still obtaining 32%/32% efficiency at maximum output power. The MAX2264/MAX2265/MAX2266 have internally referenced bias ports that are normally terminated with simple resistors. The bias ports allow customization of ACPR margin and gain. They can also be used to "throttle back" bias current when generating low power levels. The MAX2264/MAX2265/MAX2266 have excellent gain stability over temperature (0.8dB), so overdesign of driver stages and excess driver current are dramatically reduced, further increasing the phone's talk time. The devices can be operated from +2.7V to +5V while meeting all ACPR specifications over the entire temperature range. Nonlinear efficiency is 48% when matched for linear operation, or 55% when matched for non-linear-only operation (MAX2265). The devices are packaged in a 16-pin TSSOP with exposed pad (EP). For module or direct chip attach applications, the MAX2264 is also available in die form.
MAX2264/MAX2265/MAX2266
Ordering Information
PART MAX2264EUE MAX2264E/D MAX2265EUE MAX2266EUE TEMP. RANGE -40C to +85C -40C to +85C -40C to +85C -40C to +85C PINPACKAGE 16 TSSOP-EP Dice* 16 TSSOP-EP 16 TSSOP-EP
TSSOP-EP 5mm x 6.4mm
*Contact factory for dice specifications.
Applications
Cellular-Band CDMA Dual-Mode Phones Cellular-Band PDC Phones Cellular-Band TDMA Dual-Mode Phones Dual-Mode Phones 2-Way Pagers Power-Amplifier Modules
IN1 1 PWR 2 VCC 3
Pin Configurations
TOP VIEW MAX2264/MAX2266
16 IN0 15 BIAS2H 14 VCC BIAS 13 GND 12 NFP 11 OUT0 10 BIAS1L 9 OUT1
BIAS1H 4
Selector Guide
POWER-ADDED EFFICIENCY (%) DEVICE CDMA AT +28dBm 32 37 32 CDMA AT +16dBm 12 7 17 TDMA AT +30dBm -- 42 --
VCC 5 SHDN 6 BIAS2L 7 OUT1 8
MAX2264 MAX2265 MAX2266
TSSOP-EP
Pin Configurations continued at end of data sheet. 1
________________________________________________________________ Maxim Integrated Products
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800. For small orders, phone 1-800-835-8769.
2.7V, Single-Supply, Cellular-Band Linear Power Amplifiers MAX2264/MAX2265/MAX2266
ABSOLUTE MAXIMUM RATINGS
VCC to GND (no RF input) ....................................-0.3V to +6.5V Logic Inputs to GND...................................-0.3V to (VCC + 0.3V) BIAS_ _ to GND ..........................................-0.3V to (VCC + 0.3V) RF Input Power .................................................+13dBm (20mW) Logic Input Current...........................................................10mA Output VSWR with +13dBm Input ........................................2.5:1 Total DC Power Dissipation (TPADDLE = +100C) 16-Pin TSSOP-EP (derate 60mW/C above TPADDLE = +100C) ...............................................4W JA ...............................................................................8C/W Operating Temperature Range ...........................-40C to +85C Junction Temperature ......................................................+150C Storage Temperature Range .............................-65C to +150C Lead Temperature (soldering, 10sec) .............................+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 +5V, TA = TMIN to TMAX, no input signal applied, V SHDN = 2.0V. Typical values are at VCC = +3.3V and TA = +25C, unless otherwise noted.) PARAMETER Operating Voltage Range Idle Current Shutdown Supply Current Logic Input Current High Logic Input Current Low Logic Threshold High Logic Threshold Low SYMBOL VCC ICC ICC MAX2264/MAX2266 MAX2265 SHDN = PWR = GND Logic = VCC Logic = GND -1 -1 2.0 0.8 PWR = VCC PWR = GND CONDITIONS MIN 2.7 95 34 83 0.5 10 5 1 TYP MAX 5.0 UNITS V mA A A A V V
AC ELECTRICAL CHARACTERISTICS--MAX2264
(MAX2264 EV kit, VCC = VPWR = V SHDN = +3.3V, TA = +25C, fIN = 836MHz, CDMA modulation, SHDN = VCC, matching networks tuned for 824MHz to 849MHz operation, 50 system, unless otherwise noted.) PARAMETER Frequency Range (Notes 1, 2) Power Gain (Note 1) Gain Variation vs. Temperature (Note 1) SYMBOL fIN GP CONDITIONS PWR = VCC or GND PWR = VCC PWR = GND TA = TMIN to TMAX, relative to TA = +25C PWR = VCC, PIN adjusted to meet ACPR specification, fIN = 824MHz to 849MHz PWR = VCC = 2.8V, PIN adjusted to meet ACPR specification, fIN = 824MHz to 849MHz PWR = GND, PIN adjusted to meet ACPR specification, fIN = 824MHz to 849MHz PWR = GND, VCC = 2.8V, PIN adjusted to meet ACPR specification, fIN = 824MHz to 849MHz 27 26 15 14 TA = +25C TA = TMIN to TMAX MIN 824 23 22 18 21 0.8 28 dBm 27 16.5 dBm 15.5 dB 24.5 dB TYP MAX 849 UNITS MHz
Output Power (High-Power Mode) (Note 1)
POUT
Output Power (Low-Power Mode) (Note 1)
POUT
2
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2.7V, Single-Supply, Cellular-Band Linear Power Amplifiers
AC ELECTRICAL CHARACTERISTICS--MAX2264 (continued)
(MAX2264 EV kit, VCC = VPWR = V SHDN = +3.3V, TA = +25C, fIN = 836MHz, CDMA modulation, SHDN = VCC, matching networks tuned for 824MHz to 849MHz operation, 50 system, unless otherwise noted.) PARAMETER AMPS Output Power (Note 1) Adjacent-Channel Power Ratio Limit (Notes 1, 2) Alternate-Channel Power Ratio Limit (Notes 1, 2) SYMBOL POUT ACPR ACPR PIN = 8dBm VCC = 2.8V to 5.0V, offset = 885kHz, 30kHz BW, fIN = 824MHz to 849MHz VCC = 2.8V to 5.0V, offset = 1980kHz, 30kHz BW, fIN = 824MHz to 849MHz PWR = VCC, PIN adjusted to meet ACPR specification PAE PWR = GND, PIN adjusted to meet ACPR specification PAE PIN = 8dBm (Note 4) PWR = VCC or GND VSWR fIN = 824MHz to 849MHz, PWR = GND or VCC PIN = 10dBm Measured at 881MHz PWR = GND, measured at 881MHz Measured at 881MHz, PIN = 8dBm (Note 7) -139 -136 -138 32 12 44 550 1 2.4:1 -60 dBc dBm/Hz dBm/Hz dBc 5 % ns s CONDITIONS MIN 30.5 -44 -56 32 % TYP 31 MAX UNITS dBm dBc dBc
MAX2264/MAX2265/MAX2266
Power-Added Efficiency (Note 3) AMPS Power-Added Efficiency Power-Mode Switching Time Turn-On Time (Notes 1, 4) Maximum Input VSWR Nonharmonic Spurious due to Load Mismatch (Notes 1, 5) Noise Power (Note 6) AMPS Noise Power (Note 6) Harmonic Suppression
AC ELECTRICAL CHARACTERISTICS--MAX2265
(MAX2265 EV kit, VCC = V SHDN = +3.3V, TA = +25C, fIN = 836MHz, CDMA modulation, matching networks tuned for 824MHz to 849MHz operation, 50 system, unless otherwise indicated.) PARAMETER Frequency Range (Notes 1, 2) Power Gain (Note 1) Gain Variation vs. Temperature (Note 1) SYMBOL fIN GP TA = +25C TA = TMIN to TMAX TA = TMIN to TMAX, relative to TA = +25C PIN adjusted to meet ACPR specification, fIN = 824MHz to 849MHz VCC = 2.8V, PIN adjusted to meet ACPR specification, fIN = 824MHz to 849MHz PIN = 8dBm VCC = 2.8V to 5.0V, offset = 885kHz, 30kHz BW, fIN = 824MHz to 849MHz VCC = 2.8V to 5.0V, offset = 1980kHz, 30kHz BW, fIN = 824MHz to 849MHz 27 26 30 -44 -56 CONDITIONS MIN 824 24 23 0.7 28 dBm 26.5 31 -45 -57 dBm dBc dBc 25.5 TYP MAX 849 UNITS MHz dB dB
Output Power (Note 1)
POUT
AMPS Output Power (Note 1) Adjacent-Channel Power Ratio (Notes 1, 2) Alternate-Channel Power Ratio (Notes 1, 2)
POUT ACPR ACPR
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3
2.7V, Single-Supply, Cellular-Band Linear Power Amplifiers MAX2264/MAX2265/MAX2266
AC ELECTRICAL CHARACTERISTICS--MAX2265 (continued)
(MAX2265 EV kit, VCC = V SHDN = +3.3V, TA = +25C, fIN = 836MHz, CDMA modulation, matching networks tuned for 824MHz to 849MHz operation, 50 system, unless otherwise indicated.) PARAMETER Power-Added Efficiency (Note 3) AMPS Power-Added Efficiency Turn-On Time (Notes 1, 4) Maximum Input VSWR Nonharmonic Spurious Due to Load Mismatch (Notes 1, 5) Noise Power (Note 6) AMPS Noise Power (Note 6) Harmonic Suppression VSWR fIN = 824MHz to 849MHz PIN = 10dBm Measured at 881MHz Measured at 881MHz, PIN = 8dBm (Note 7) -140 -139 47 SYMBOL PAE PAE CONDITIONS PIN adjusted to give POUT = 28dBm PIN adjusted for POUT = 16dBm PIN = 8dBm MIN TYP 37 7 48 1 1.3:1 -60 dBc dBm/Hz dBm/Hz dBc 5 MAX UNITS % % s
AC ELECTRICAL CHARACTERISTICS--MAX2266
(MAX2266 EV kit, VCC = V SHDN = +3.3V, TA = +25C, fIN = 836MHz, CDMA modulation, matching networks tuned for 824MHz to 849MHz operation, 50 system, unless otherwise indicated.) PARAMETER Frequency Range (Notes 1, 2) Power Gain (Note 1) Gain Variation vs. Temperature (Note 1) SYMBOL fIN GP CONDITIONS PWR = VCC or GND PWR = VCC PWR = GND TA = TMIN to TMAX, relative to TA = +25C PWR = VCC, PIN adjusted to meet ACPR specification, fIN = 824MHz to 849MHz PWR = VCC = 2.8V, PIN adjusted to meet ACPR specification, fIN = 824MHz to 849MHz PWR = GND, PIN adjusted to meet ACPR specification, fIN = 824MHz to 849MHz PWR = GND, VCC = 2.8V, PIN adjusted to meet ACPR specification, fIN = 824MHz to 849MHz PIN = 8dBm VCC = 2.8V to 5.0V, offset = 885kHz, 30kHz BW, fIN = 824MHz to 849MHz VCC = 2.8V to 5.0V, offset = 1980kHz, 30kHz BW, fIN = 824MHz to 849MHz PWR = VCC, PIN adjusted to meet ACPR specification PAE PWR = GND, PIN adjusted to meet ACPR specification 17 27 26 14 13 31 -44 -56 32 % TA = +25C TA = TMIN to TMAX MIN 824 24.5 23 25 27.5 0.8 28 dBm 27 15.5 dBm 14 32 dBm dBc dBc dB 26 dB TYP MAX 849 UNITS MHz
Output Power (High-Power Mode) (Note 1)
POUT
Output Power (Low-Power Mode) (Note 1) AMPS Output Power (Note 1) Adjacent-Channel Power Ratio Limit (Notes 1, 2) Alternate-Channel Power Ratio Limit (Notes 1, 2)
POUT
POUT ACPR ACPR
Power-Added Efficiency (Note 3)
4
_______________________________________________________________________________________
2.7V, Single-Supply, Cellular-Band Linear Power Amplifiers
AC ELECTRICAL CHARACTERISTICS--MAX2266 (continued)
(MAX2266 EV kit, VCC = VPWR = V SHDN = +3.3V, TA = +25C, fIN = 836MHz, CDMA modulation, SHDN = VCC, matching networks tuned for 824MHz to 849MHz operation, 50 system, unless otherwise noted.) PARAMETER AMPS Power-Added Efficiency Power-Mode Switching Time Turn-On Time (Notes 1, 4) Maximum Input VSWR Nonharmonic Spurious due to Load Mismatch (Notes 1, 5) Noise Power (Note 6) AMPS Noise Power (Note 6) Harmonic Suppression VSWR SYMBOL PAE PIN = 8dBm (Note 4) PWR = VCC or GND fIN = 824MHz to 849MHz, PWR = GND or VCC PIN = 10dBm Measured at 881MHz PWR = GND, measured at 881MHz Measured at 881MHz, PIN = 8dBm (Note 7) -137 -130 -136 32 CONDITIONS MIN TYP 48 550 1 2.4:1 -60 dBc dBm/Hz dBm/Hz dBc 5 MAX UNITS % ns s
MAX2264/MAX2265/MAX2266
Note 1: Minimum and maximum values are guaranteed by design and characterization, not production tested. Note 2: PMAX is met over this frequency range at the ACPR limit with a single matching network. For optimum performance at other frequencies, the output matching network must be properly designed. See the Applications Information section. Operation between 750MHz and 1000MHz is possible but has not been characterized. Note 3: PAE is specified into a 50 load, while meeting ACPR requirements. Note 4: Time from logic transition until POUT is within 1dB of its final mean power. Note 5: Murata isolator as load with 20:1 VSWR any phase angle after isolator. Note 6: Noise power can be improved by using the circuit in Figures 1, 2, and 3. Note 7: Harmonics measured on evaluation kit, which provides some harmonic attenuation in addition to the rejection provided by the IC. The combined suppression is specified.
Typical Operating Characteristics
(MAX2264/MAX2265/MAX2266 EV kits, VCC = +3.3V, SHDN = VCC, CDMA modulation, TA = +25C, unless otherwise noted.)
MAX2264 SHUTDOWN CURRENT vs. SUPPLY VOLTAGE
MAX2264-01
MAX2264 GAIN vs. SUPPLY VOLTAGE
MAX2264-02
MAX2264 GAIN vs. SUPPLY VOLTAGE
PWR = GND 26 TA = -40C
MAX2264-03
140 120 SUPPLY CURRENT (nA) 100 80 60 40 20 TA = -40C 0 2.5 3.0 3.5 4.0 4.5 5.0 TA = +25C PWR = GND SHDN = GND NO INPUT DRIVE TA = +85C
30 PWR = VCC 28 TA = -40C
28
GAIN (dB)
26
GAIN (dB)
24
TA = +25C
24 TA = +25C 22
22
TA = +85C 20 TA = +85C
20 5.5 2.5 3.0 3.5 4.0 4.5 5.0 SUPPLY VOLTAGE (V) SUPPLY VOLTAGE (V)
18 2.5 3.0 3.5 4.0 4.5 5.0 SUPPLY VOLTAGE (V)
_______________________________________________________________________________________
5
2.7V, Single-Supply, Cellular-Band Linear Power Amplifiers MAX2264/MAX2265/MAX2266
Typical Operating Characteristics (continued)
(MAX2264/MAX2265/MAX2266 EV kits, VCC = +3.3V, SHDN = VCC, CDMA modulation, TA = +25C, unless otherwise noted.)
MAX2264 POWER-ADDED EFFICIENCY vs. SUPPLY VOLTAGE
MAX2264-04
MAX2264 POWER-ADDED EFFICIENCY vs. SUPPLY VOLTAGE
MAX2264-05
MAX2264 OUTPUT POWER vs. INPUT POWER
PWR = VCC VCC = 3.3V TA = +25C VCC = 3.3V TA = -40C VCC = 2.7V TA = -40C VCC = 2.7V TA = +25C VCC = 2.7V TA = +85C 0 2 4 INPUT POWER (dBm) 6 8 VCC = 3.3V TA = +85C
MAX2264-06
36 PWR = VCC 34 TA = -40C
14 PWR = GND 13 12
32 31 OUTPUT POWER (dBm) 30 29 28 27 26 25
TA = -40C
PAE (%)
PAE (%)
32 TA = +85C TA = +25C
11 10
TA = +25C
30
TA = +85C
28
9 8 2.5 3.0 3.5 4.0 4.5 5.0 2.5 3.0 3.5 4.0 4.5 5.0 SUPPLY VOLTAGE (V) SUPPLY VOLTAGE (V)
26
MAX2264 OUTPUT POWER vs. INPUT POWER
MAX2264-07
MAX2264 GAIN vs. OUTPUT POWER
PWR = VCC 26 VCC = 2.7V TA = -40C VCC = 3.3V TA = -40C
MAX2264-08
MAX2264 GAIN vs. OUTPUT POWER
PWR = GND 24 TA = -40C GAIN (dB) 23
MAX2264-09
20 PWR = GND OUTPUT POWER (dBm) 16 TA = +25C 12 TA = +85C TA = -40C
27
25
GAIN (dB)
25 VCC = 3.3V TA = +85C VCC = 3.3V VCC = 2.7V TA = +25C TA = +85C VCC = 2.7V TA = +25C 0 5 10 15 20 25 30 35
24
22 TA = +25C 21 TA = +85C
8
23
4 -14 -12 -10 -8 -6 -4 -2 INPUT POWER (dBm)
22 OUTPUT POWER (dBm)
20 -10 -5 0 5 10 15 20 OUTPUT POWER (dBm)
MAX2264 SUPPLY CURRENT vs. OUTPUT POWER
MAX2264-10
MAX2264 SUPPLY CURRENT vs. OUTPUT POWER
MAX2264-11
MAX2264 ADJACENT-CHANNEL POWER RATIO vs. OUTPUT POWER
PWR = VCC -40 TA = +85C
MAX2264-12
800 PWR = VCC SUPPLY CURRENT (mA) 600
160 PWR = GND 120
-30
SUPPLY CURRENT (mA)
ACPR (dBc)
TA = +85C 80 TA = +25C
-50 TA = +25C
400
VCC = 2.7V/3.3V AT TA = -40C/+25C/+85C
-60
TA = -40C
200
40
TA = -40C
-70
0 0 5 10 15 20 25 30 35 OUTPUT POWER (dBm)
0 0 3 6 9 12 15 18 OUTPUT POWER (dBm)
-80 -20 -10 0 10 20 30 OUTPUT POWER (dBm)
6
_______________________________________________________________________________________
2.7V, Single-Supply, Cellular-Band Linear Power Amplifiers
Typical Operating Characteristics (continued)
(MAX2264/MAX2265/MAX2266 EV kits, VCC = +3.3V, SHDN = VCC, CDMA modulation, TA = +25C, unless otherwise noted.)
MAX2264 ADJACENT-CHANNEL POWER RATIO vs. OUTPUT POWER
MAX2264-13
MAX2264/MAX2265/MAX2266
MAX2264 POWER-ADDED EFFICIENCY vs. OUTPUT POWER
MAX2264-14
MAX2264 POWER-ADDED EFFICIENCY vs. OUTPUT POWER
PWR = GND TA = +85C 12 TA = +25C PAE (%) 8 TA = -40C
MAX2264-15
-40 PWR = GND TA = +85C -45 TA = +25C ACPR (dBc)
55 50 45 40 PAE (%) 35 30 25 20 15 10 5 0
16
PWR = VCC TA = TMIN TO TMAX VCC = 2.7V
-50 TA = -40C -55
-60
VCC = 3.3V
4
-65 -10 -5 0 5 10 15 20 OUTPUT POWER (dBm)
0 0 5 10 15 20 25 30 35 -10 -5 0 5 10 15 20 OUTPUT POWER (dBm) OUTPUT POWER (dBm)
MAX2264 POWER-ADDED EFFICIENCY vs. FREQUENCY
MAX2264-16
MAX2264 POWER-ADDED EFFICIENCY vs. FREQUENCY
MAX2264-17
MAX2265 SHUTDOWN CURRENT vs. SUPPLY VOLTAGE
120
SUPPLY CURRENT (nA)
PWR = VCC POUT = 28dBm 38
PWR = GND POUT = 16dBm 11% 12% 12% 12% 11%
PWR = GND SHDN = GND NO INPUT DRIVE
100 80 60 40 20 TA = -40C TA = +25C TA = +85C
10 PAE (%) PAE (%) 36
34 32.7% 32 32.0%
33.2%
33.1%
33.0%
5
30 824 830 836 842 848 FREQUENCY (MHz)
0 824 830 836 842 848 FREQUENCY (MHz)
0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 SUPPLY VOLTAGE (V)
MAX2265 GAIN vs. SUPPLY VOLTAGE
MAX2265-19
MAX2265 POWER-ADDED EFFICIENCY vs. SUPPLY VOLTAGE
MAX2265-20
MAX2265 OUTPUT POWER vs. INPUT POWER
31 OUTPUT POWER (dBm) 30 29 28 27 26 VCC = 3.3V TA = +25C VCC = 3.3V TA = -40C VCC = 2.7V TA = -40C VCC = 2.7V TA = +25C VCC = 2.7V TA = +85C 0 2 4 INPUT POWER (dBm) 6 8 VCC = 3.3V TA = +85C
MAX2265-21
30 TA = -40C
39
32
28
37
GAIN (dB)
PAE (%)
26 TA = +85C
35 TA = +85C 33
TA = +25C
TA = -40C
24
TA = +25C
22
31
20 2.5 3.0 3.5 4.0 4.5 5.0 SUPPLY VOLTAGE (V)
29 2.5 3.0 3.5 4.0 4.5 5.0 SUPPLY VOLTAGE (V)
25
_______________________________________________________________________________________
7
MAX2265-18
40
15
140
2.7V, Single-Supply, Cellular-Band Linear Power Amplifiers MAX2264/MAX2265/MAX2266
Typical Operating Characteristics (continued)
(MAX2264/MAX2265/MAX2266 EV kits, VCC = +3.3V, SHDN = VCC, CDMA modulation, TA = +25C, unless otherwise noted.)
MAX2265 GAIN vs. OUTPUT POWER
VCC = 3.3V TA = -40C
MAX2265-22
MAX2265 SUPPLY CURRENT vs. OUTPUT POWER
MAX2265-23
MAX2265 ADJACENT-CHANNEL POWER RATIO vs. OUTPUT POWER
VCC = 3.3V -40 ACPR (dBc) TA = +85C
MAX2265-24
27 VCC = 2.7V TA = -40C
800
-30
26
SUPPLY CURRENT (mA)
600
GAIN (dB)
25 VCC = 3.3V TA = +85C VCC = 3.3V VCC = 2.7V TA = +25C TA = +85C VCC = 2.7V TA = +25C 0 5 10 15 20 25 30 35
-50 TA = +25C
400
VCC = 2.7V/3.3V AT TA = -40C/+25C/+85C
24
-60
TA = -40C
200 USING OPTIONAL TB CIRCUIT IN FIGURE 2 0 0 5 10 15 20 25 30 35
23
-70
22 OUTPUT POWER (dBm)
-80 -20 -10 0 10 20 30 OUTPUT POWER (dBm) OUTPUT POWER (dBm)
MAX2265 POWER-ADDED EFFICIENCY vs. OUTPUT POWER
MAX2265-25
MAX2265 POWER-ADDED EFFICIENCY vs. FREQUENCY
MAX2265-26
MAX2265 TDMA POWER SPECTRUM
30 20
MAX2265-27
55 50 45 40 35 PAE (%) 30 25 20 15 10 5 0 0 5 10
VCC = 2.7V TA = -40C VCC = 2.7V TA = +25C VCC = 2.7V TA = +85C VCC = 3.3V TA = -40C VCC = 3.3V TA = +85C
40
40
38 36.50% PAE (%) 36 36.75% 36.58% 36.74% POWER (dBm) 36.38%
10 0 -10 -20 -30
34
VCC = 3.3V TA = +25C
32
-40 -50
15
20
25
30
35
30 826 831 836 841 846 FREQUENCY (MHz)
-60 CENTER 836MHz 15.2805kHz/div SPAN 152.805kHz
OUTPUT POWER (dBm)
MAX2266 SHUTDOWN CURRENT vs. SUPPLY VOLTAGE
MAX2266-01
MAX2266 GAIN vs. SUPPLY VOLTAGE
MAX2266 toc02
MAX2266 GAIN vs. SUPPLY VOLTAGE
PWR = GND PIN = SET FOR ACPR LIMIT
MAX2266 toc03
140 120 SUPPLY CURRENT (nA) 100 80 60 40 20 TA = -40C 0 2.5 3.0 3.5 4.0 4.5 5.0 TA = +25C PWR = GND SHDN = GND NO INPUT DRIVE TA = +85C
30
PWR = VCC TA = -40C
34
28
32 TA = -40C
GAIN (dB)
TA = +85C 24 TA = +25C
GAIN (dB)
26
30
28
22
26 TA = +25C TA = +85C 4.0 4.5 5.0
20 5.5 2.5 3.0 3.5 4.0 4.5 5.0 SUPPLY VOLTAGE (V) SUPPLY VOLTAGE (V)
24 2.5 3.0 3.5 SUPPLY VOLTAGE (V)
8
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2.7V, Single-Supply, Cellular-Band Linear Power Amplifiers
Typical Operating Characteristics (continued)
(MAX2264/MAX2265/MAX2266 EV kits, VCC = +3.3V, SHDN = VCC, CDMA modulation, TA = +25C, unless otherwise noted.)
MAX2266 POWER-ADDED EFFICIENCY vs. SUPPLY VOLTAGE
MAX2266 toc04
MAX2264/MAX2265/MAX2266
MAX2266 POWER-ADDED EFFICIENCY vs. SUPPLY VOLTAGE
PWR = GND
MAX2266 toc05
MAX2266 OUTPUT POWER vs. INPUT POWER
PWR = VCC 31 OUTPUT POWER (dBm) 30 29 28 27 26 25
VCC = 2.7V TA = +85C VCC = 3.3V TA = -40C VCC = 3.3V TA = +25C VCC = 3.3V TA = +85C
MAX2266 toc06
36
PWR = VCC TA = -40C
20 19
32
34
TA = -40C 18 PAE (%) PAE (%) 32 17 16 15 14 2.5 3.0 3.5 4.0 4.5 5.0 2.5 3.0 3.5 4.0 4.5 5.0 SUPPLY VOLTAGE (V) SUPPLY VOLTAGE (V) TA = +25C TA = +85C
30
TA = +25C
TA = +85C
VCC = 2.7V TA = -40C VCC = 2.7V TA = +25C
28
26
0
1
2
3
4
5
6
7
8
INPUT POWER (dBm)
MAX2266 OUTPUT POWER vs. INPUT POWER
MAX2266 toc07
MAX2266 GAIN vs. OUTPUT POWER
MAX2266 toc08
MAX2266 GAIN vs. OUTPUT POWER
PWR = GND TA = -40C
MAX2266 toc09
24
PWR = GND TA = -40C
27 PWR = VCC 26
VCC = 2.7V TA = -40C VCC = 3.3V TA = -40C
30
OUTPUT POWER (dBm)
20
29
TA = +25C GAIN (dB) 25
16
GAIN (dB)
28 TA = +25C 27
TA = +85C
24
VCC = 3.3V TA = +85C VCC = 2.7V TA = +85C VCC = 3.3V VCC = 2.7V TA = +25C TA = +25C
12 23 8 -14 -12 -10 -8 -6 -4 -2 INPUT POWER (dBm)
26
TA = +85C
22 0 5
25 25 30 35 -10 -5 0 5 10 15 20 OUTPUT POWER (dBm)
10
15
20
OUTPUT POWER (dBm)
MAX2266 SUPPLY CURRENT vs. OUTPUT POWER
MAX2266 toc10
MAX2266 SUPPLY CURRENT vs. OUTPUT POWER
PWR = GND
MAX2266 toc11
MAX2266 ADJACENT-CHANNEL POWER RATIO vs. OUTPUT POWER
PWR = VCC TA = +25C -40 ACPR (dBc) TA = +85C
MAX2266 toc12
800
PWR = VCC
160
-30
SUPPLY CURRENT (mA)
SUPPLY CURRENT (mA)
600 VCC = 2.7V/3.3V AT TA = -40C/+25C/+85C
120 TA = +85C 80 TA = +25C
-50 TA = -40C
400
-60
200
40
TA = -40C
-70
0 0 5 10 15 20 25 30 35 OUTPUT POWER (dBm)
0 0 3 6 9 12 15 18 OUTPUT POWER (dBm)
-80 -20 -10 0 10 20 30 OUTPUT POWER (dBm)
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9
2.7V, Single-Supply, Cellular-Band Linear Power Amplifiers MAX2264/MAX2265/MAX2266
Typical Operating Characteristics (continued)
(MAX2264/MAX2265/MAX2266 EV kits, VCC = +3.3V, SHDN = VCC, CDMA modulation, TA = +25C, unless otherwise noted.)
MAX2266 ADJACENT-CHANNEL POWER RATIO vs. OUTPUT POWER
MAX2266 toc13
MAX2266 POWER-ADDED EFFICIENCY vs. OUTPUT POWER
MAX2266 toc14
MAX2266 POWER-ADDED EFFICIENCY vs. OUTPUT POWER
PWR = GND TA = +25C 15 TA = -40C PAE (%) 10
MAX2266 toc15
-30
PWR = GND
55 50 45 40 35 PAE (%) 30 25 20 15 10 5 0 VCC = 3.3V VCC = 2.7V PWR = VCC
20
-40 TA = +85C ACPR (dBc) -50
-60
TA = +25C
-70 TA = -40C -80 -10 -5 0 5 10 15 20
5
TA = +85C
0 0 5 10 15 20 25 30 35 -10 -5 0 5 10 15 20 OUTPUT POWER (dBm) OUTPUT POWER (dBm)
MAX2266 POWER-ADDED EFFICIENCY vs. FREQUENCY
MAX2266 toc16
MAX2266 POWER-ADDED EFFICIENCY vs. FREQUENCY
PWR = GND POUT = 16dBm
MAX2266 toc17
38
PWR = VCC POUT = 28dBm
25
36
20 17.6% PAE (%) PAE (%) 34 31.9% 32.2% 32.4% 15 17.4% 17.3% 17.0% 16.9%
32
31.3%
31.6%
30
10
28 824 830 836 842 848 FREQUENCY (MHz)
5 824 830 836 842 848 FREQUENCY (MHz)
10
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2.7V, Single-Supply, Cellular-Band Linear Power Amplifiers
Pin Description
PIN MAX2264 MAX2266 1 2 3, 5, 14 4 6 7 8, 9 10 11 12 -- 13, Slug 15 16 MAX2265 1 -- 3, 5 4 2, 6 -- 8, 9 -- -- 12 7, 10, 11, 14, 16 13, Slug 15 -- NAME IN1 PWR VCC BIAS1H SHDN BIAS2L OUT1 BIAS1L OUT0 NFP N.C. GND BIAS2H IN0 FUNCTION RF Input Port. Requires external matching network. Mode-Select Input. Drive low to select the low-power mode (BIAS1L and BIAS2L). Drive high to select high-power mode (BIAS1H and BIAS2H). Voltage Supply. Bypass with capacitors connected between this pin and GND. High-Power Mode First Stage Bias Control. See General Description. Shutdown Control Input. Drive SHDN low to enable shutdown. Drive high for normal operation. On the MAX2265, make sure that both pins get driven simultaneously. To place the MAX2264/MAX2266 into shutdown mode, also pull the PWR pin low. Low-Power Mode Second Stage Bias Control. See General Description. RF Output Ports. Require an appropriate output matching network and collector bias. Low-Power Mode First Stage Bias Control. See General Description. RF Output Port. Requires an appropriate output matching network and collector bias. Noise Filtering Pin. Connect noise filtering network as described in Noise Filtering section. If unused, leave open. Not Internally Connected. Do not make any connections to these pins. Ground. Solder the package slug to high-thermal-conductivity circuit board ground plane. High-Power Mode Second Stage Bias Control. See General Description. RF Input Port. Requires external matching network.
MAX2264/MAX2265/MAX2266
Detailed Description
The MAX2264/MAX2265/MAX2266 are linear power amplifiers (PAs) intended for CDMA and TDMA applications. The devices have been fully characterized in the 824MHz to 849MHz U.S. cellular band and can be used from 750MHz to 1000MHz by adjusting the input and output match. In CDMA applications, they provide typically 28dBm of output power and up to 37% poweradded efficiency (PAE) from a single +2.7V to +5V supply. In TDMA applications, efficiency is 42% at 30dBm of output power. An inherent drawback of traditional PAs is that their efficiency drops rapidly with reduced output power. For example, in a PA designed for maximum efficiency at +28dBm, the efficiency at +15dBm falls well below 4.5% (over 210mA from a +3.3V supply). This behavior significantly reduces talk time in CDMA phones
because over 90% of the time they are at output powers below +16dBm. The MAX2264/MAX2265/MAX2266 are optimized for lowest current draw at output powers that are most likely to occur in real-life situations. This provides up to 50% reduced average PA current.
High-Power and Low-Power Modes
The MAX2264/MAX2266 are designed to provide optimum PAE in both high- and low-power modes. For a +3.3V supply, maximum output power is +28dBm in high-power mode and +16dBm in low-power mode. Use the system's microcontroller to determine required output power, and switch between the two modes as appropriate with the PWR logic pin.
Bias Control
The bias current of the first stage in low-power mode is proportional to the current flowing out of BIAS1L. The voltage at BIAS1L is fixed by an internal bandgap refer11
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2.7V, Single-Supply, Cellular-Band Linear Power Amplifiers MAX2264/MAX2265/MAX2266
ence, so the current out of this pin is inversely proportional to the value of the resistor between this pin and ground. Similarly, the bias current of the first stage in high-power mode is proportional to the current flowing out of BIAS1H. The current in the second stage is proportional to the currents out of BIAS2L and BIAS2H for low- and high-power modes, respectively. Additionally, these resistors allow for customization of gain and alternate- and adjacent-channel power ratios. Increasing the bias current in the first stage increases the gain and improves alternate-channel power ratio at the expense of efficiency. Increasing the bias current in the second stage increases gain at the expense of efficiency as well as adjacent- and alternate-channel power ratios. The PA bias current can be dynamically adjusted by summing a current into the bias pin of interest with an external source such as a DAC. See the MAX2265 Typical Application Circuit for using a voltage DAC and current setting resistors RTB1 and RTB2. Choosing RTB1 = R1 and RTB2 = R2 allows current adjustment between 0mA to double the nominal idle current with DAC voltages between 0V and 2.4V. The DAC must be able to source approximately 100A.
Shutdown Mode
Pull pins 2 and 6 low to place the MAX2264/MAX2265/ MAX2266 into shutdown mode. In this mode, all gain stages are disabled and supply current drops to 0.5A.
Increasing Efficiency Further
The MAX2266 incorporates an additional external switch to increase efficiency to 17% at +16dBm and to 32% at +28dBm. This efficiency increase is mainly due to the additional isolation between the high- and lowpower outputs provided by the external switch.
Applications Information
External Components
The MAX2264/MAX2265/MAX2266 require matching circuits at their inputs and outputs for operation in a 50 system. The application circuits in Figures 1, 2, and 3 describe the topology of the matching circuits for
RFIN
C2 L1 C1 L2
MAX2264
L3 PWR 1 C3 C11 VCC RH1 2 3 BIAS 4 5 6 7 RL2 VCC L4 C4 C7 RFOUT C9 8 16 15 14 13 12 11 10 9 RL1 C8 L5 VCC C5 C6 C13 VCC OPTIONAL NOISE-REDUCTION CIRCUIT L6 RH2
C12 VCC SHDN
Figure 1. MAX2264 Typical Application Circuit 12 ______________________________________________________________________________________
2.7V, Single-Supply, Cellular-Band Linear Power Amplifiers
each device; suggested component values, suppliers, and part numbers are listed in Table 1. These values are optimized for best simultaneous efficiency and return loss performance. Use high-quality components in these matching circuits for greatest efficiency. To minimize coupling between different sections of the system, the ideal power-supply layout is a star configuration with a large decoupling capacitor at a central VCC node. The VCC traces branch out from this central node, each leading to a separate VCC node on the PC board. A second bypass capacitor with low ESR at the RF frequency of operation is located at the end of each trace. This arrangement provides local decoupling at the VCC pin. Input and output impedance-matching networks are very sensitive to layout-related parasitics. It is important to keep all matching components as close to the IC as possible to minimize the effects of stray inductance and stray capacitance of PC board traces.
MAX2264/MAX2265/MAX2266
Layout and Power-Supply Bypassing
A properly designed PC board is essential to any RF/microwave circuit. Be sure to use controlled impedance lines on all high-frequency inputs and outputs. Proper grounding of the GND pins is fundamental; if the PC board uses a topside RF ground, connect all GND pins (especially the TSSOP package exposed GND pad) directly to it. On boards where the ground plane is not on the component side, it's best to connect all GND pins to the ground plane with plated through-holes close to the package.
RFIN OPTIONAL TB CIRCUIT TX POWER L1 RTB2 C1 RTB1
MAX2265
C3 C11 VCC R1 L3 1 2 3 4 C12 VCC SHDN 5 6 7 8 VCC L4 C4 L6 C7 RFOUT C6 C9 BIAS 16 15 14 13 12 11 10 9 L7 OPTIONAL NOISE-REDUCTION CIRCUIT C13 R2
Figure 2. MAX2265 Typical Application Circuit ______________________________________________________________________________________ 13
2.7V, Single-Supply, Cellular-Band Linear Power Amplifiers MAX2264/MAX2265/MAX2266
Noise Filtering
For improved noise performance, the MAX2264/ MAX2265/MAX2266 allow for additional noise filtering for further suppression of transmit noise. This is achieved by using C6 and L6 on the MAX2264, C13 and L7 on the MAX2265, and C6 and L6 on the MAX2266. Use the recommended component values for optimal noise power (Table 1).
RFIN
C2 L1 C1 L2
MAX2266
L3 PWR 1 C3 C11 VCC RH1 C12 VCC SHDN RL2 VCC L4 C4 VCC 2 3 4 5 6 7 8 BIAS 16 15 14 13 12 11 10 9 RL1 C6 C13 L6 VCC RH2
OPTIONAL NOISEREDUCTION CIRCUIT L5 VCC C5
C7
U1 UPG152TA 2
3 6 4 5
R1
PWR
C9
C8
Q1
OPTIONAL RFOUT
Figure 3. MAX2266 Typical Application Circuit 14 ______________________________________________________________________________________
2.7V, Single-Supply, Cellular-Band Linear Power Amplifiers
Pin Configurations (continued)
TOP VIEW MAX2265
IN1 1 SHDN VCC BIAS1H VCC 2 3 BIAS 4 5 16 N.C. 15 BIAS2H 14 N.C. 13 GND 12 NFP 11 N.C. 10 N.C. 9 OUT1
Chip Information
TRANSISTOR COUNT: 1256
MAX2264/MAX2265/MAX2266
SHDN 6 N.C. 7 OUT1 8
TSSOP-EP
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15
2.7V, Single-Supply, Cellular-Band Linear Power Amplifiers MAX2264/MAX2265/MAX2266
NOTES
16
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