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本文概括了Maxim针对蜂窝、PCS、802.11b、无绳电话以及Bluetooth等应用提供的射频(RF)功率放大器(PA)。列出了工作电压、电源电流、输出功率、封装、功效等参数的对照表，并给出了Maxim PA IC的特点。另外，还提供了一个根据市场应用选择的参考表。
更多信息请查询：无线产品网页
更多信息请查询：快速浏览MAX2240数据资料
更多信息请查询：快速浏览MAX2264/MAX2265数据资料
更多信息请查询：快速浏览MAX2267/MAX2268/MAX2269数据资料
更多信息请查询：快速浏览MAX2320/MAX2321/MAX2322/MAX2324/MAX2326/MAX2327数据资料
更多信息请查询：快速浏览MAX2430数据资料
更多信息请查询：快速浏览MAX2601/MAX2602数据资料
更多信息请查询：应用技术支持
Maxim的RF功率放大器即可应用于线性调制，如QAM和QPSK，也可用于非线性调制，如：FM、FSK等。针对TDMA市场设计的PA在性能上有所改进，如：自动斜率控制可减小频谱扩散，自动斜率控制有助于保持Vcc的稳定、降低VCO牵引。自动热保护功能能够根据需要临时减小输出功率，提供一个坚固、耐用的PA。针对CDMA市场推出的PA能够在城市或远郊CDMA环境下、对于大多数便携终端要求的输出功率电平提供更低的电源电流，CDMA PA在大多数时间工作在较低的输出功率状态。
对于2.4GHz ISM应用，如：802.11b WLAN、Bluetooth、HomeRF及无绳电话，Maxim可提供低成本、超小尺寸(如UCSP封装)的功率放大器，这些PA具有模拟或数字的功率控制、闭环功率控制、动态偏置控制、集成检测器等，并具有较高的效率。
以下列出了采用硅双极型工艺设计的RF功率放大器关键特性：
- 低成本，这一点得益于它较高的管芯产量和简单的器件制作工艺(与超外差器件相比)
- 小尺寸，采用UCSP封装和较少的外部元件
- 无需负偏置电源，不同于大多数GaAs放大器
- 在全温范围和负载变化范围内提供稳定的器件特性
- 自动斜率控制
下表列出了我们的一些功率放大器及其性能，注意，有几款PA需要在指定的性能参数和中心频点进行重新调谐，与表中参数有差异。
表1. 选择指南: 型号列表
|
Part |
Vcc
(V) |
Icc
(mA) |
Frequency
(MHz) |
Pout
(dBm) |
Class |
Package |
PAE
(full) |
PAE
(derated) |
Features |
|
MAX2235 |
2.7 to 5.5 |
20 idle
610 full |
800 to 1000 |
+30.3 |
C |
20-Pin
TSSOP-EP |
47% |
22%
+24dBm |
Analog Gain Control, Auto Power Ramp, Shutdown |
|
MAX2430 |
3.0 to 5.5 |
52 |
800 to 1000 |
+21.4 |
AB |
16-Pin
SO/QSOP |
24% |
NA |
Power Control, Shutdown, Drives MAX2601/02 |
|
MAX2601 |
2.7 to 5.5 |
450 |
DC to 1000 |
+30.0 |
AB/C |
8-Pin
PSOPII |
54% |
18%
+20dBm |
Power Transistor |
|
MAX2602 |
2.7 to 5.5 |
450 |
DC to 1000 |
+30.0 |
AB/C |
8-Pin
PSOPII |
54% |
18%
+20dBm |
Power Transistor with On-Chip Bias Diode, Power Ramp, Shutdown |
|
MAX2264 |
2.7 to 5.0 |
34 idle,
58 avg,
95 full |
824 to 849 |
+28.0 |
AB |
16-Pin
TSSOP-EP |
32% |
12%
+16dBm |
IS-98 CDMA U.S., Internal Switch,
Smallest, Most Economical Solution |
|
MAX2265 |
2.7 to 5.0 |
83 full |
824 to 849 |
+28.0 |
AB |
16-Pin
TSSOP-EP |
37% |
7%
+16dBm |
IS-98 CDMA U.S., TDMA PAE = 40% at +30dBm |
|
MAX2266 |
2.7 to 5.0 |
34 idle,
52 avg,
100 full |
824 to 849 |
+28.0 |
AB |
16-Pin
TSSOP-EP |
32% |
17%
+16dBm |
IS-98 CDMA U.S., Off-Chip Switch, Lowest Current |
|
MAX2267 |
2.7 to 4.5 |
34 idle,
56 avg,
95 full |
887 to 925 |
+27.0 |
AB |
16-Pin
TSSOP-EP |
28% |
12%
+17dBm |
IS-98 CDMA Japan, Internal Switch,
Smallest, Most Economical Solution |
|
MAX2268 |
2.7 to 4.5 |
90 idle |
887 to 925 |
+27.0 |
AB |
16-Pin
TSSOP-EP |
34% |
7%
+13.6dBm |
IS-98 CDMA Japan, PDC PAE = 41% at +29dBm |
|
MAX2269 |
2.7 to 4.5 |
34 idle,
50 avg,
100 full |
887 to 925 |
+27.0 |
AB |
16-Pin
TSSOP-EP |
29% |
17%
+17dBm |
IS-98 CDMA Japan, Off-Chip Switch, Lowest Current |
|
MAX2240 |
2.7 to 5.0 |
65 idle
105 full |
2400 to 2500 |
+20 |
AB |
UCSP
3x3 |
30% |
NA |
Bluetooth PA with Digital Power Control, Shutdown |
|
MAX2242 |
2.7 to 3.6 |
280 idle
300 full |
2400 to 2500 |
+22.5 |
AB |
UCSP
3x4 |
17%
Pin=
-7dBm
315mA |
6.7%
+13dBm |
+22.5dBm Output Power at -33dBc ACPR for 802.11b
28.5dB Power Gain
External Bias Control for Current Throttleback
On-Chip Power Detector
Output Power Tunable from +10dBm to +22dBm |
|
MAX2244 |
3.0 to 3.6 |
65 idle
172 full |
2400 to 2500 |
+22 |
AB |
UCSP
3x3 |
34.2% |
NA |
Integrated Input Match
Internal Bandwidth-Limited Power Ramping
Power Control Range: 0.5V to 2.0V
Supply Current = 170mA at +22dBm |
|
MAX2245 |
3.0 to 3.6 |
65 idle
179 full |
2400 to 2500 |
+22 |
AB |
UCSP
3x3 |
29.2% |
NA |
Integrated Input Match
Internal Bandwidth-Limited Power Ramping
Power Control Range: 0.9V to 2.0V
Supply Current = 170mA at +22dBm |
|
MAX2246 |
3.0 to 3.6 |
42 idle
118 full |
2400 to 2500 |
+20 |
AB |
UCSP
3x3 |
27.8% |
NA |
Integrated Input Match
Internal Bandwidth-Limited Power Ramping
Power Control Range: 0.5V to 2.0V |
|
MAX2247 |
2.7 to 3.6 |
293 idle
390 full |
2400 to 2500 |
+25 |
AB |
UCSP
3x4 |
24.5% |
21%
+22.5dBm |
High Linear Output Power: +25dBm with < -33dBc ACPR
(1st side lobe) and < -55dBc ACPR (2nd side lobe)
25% Efficiency with Linear Output Power
29dB Power Gain
On-Chip Power Detector
External Bias Control for Current Throttleback
On-Chip Input Matching
0.5µA Shutdown Mode |
|
MAX2251 |
2.8 to 4.5 |
205 idle
1029 full |
824 to 849 |
|
AB |
UCSP
3x4 |
|
38%
+30dBm
AMPS |
Gain: 28dB
Integrated Power Detector
Low-Power Shutdown Mode
PAE: 41% at +30dBm for TDMA
PAE: 51% at +32.4dBm for AMPS |
|
MAX2281 |
2.7 to 4.2 |
35 idle
731 full |
824 to 849 |
+29 |
AB |
UCSP
5x5 |
+31% |
14%
+16dBm |
PAE: 14% at +16dBm Output Power for CDMA
PAE: 31% at +29dBm Output Power for CDMA
PAE: 40% at +31.5dBm Output Power for AMPS
PAE: 43% at +30.5dBm Output Power for TDMA
Shutdown Mode |
|
MAX2282 |
2.7 to 4.2 |
35 idle
471 full |
887 to 925 |
+27.5 |
AB |
UCSP
5x5 |
34% |
17%
+18dBm |
PAE: 17% at +18dBm Output Power for JCDMA
PAE: 34% at +27.5dBm Output Power for JCDMA
23dB Low-Power Mode Gain
28dB High-Power Mode Gain
Shutdown Mode |
|
MAX2291 |
2.7 to 4.2 |
30 idle
629 full |
1850 to 1910 |
+29 |
AB |
UCSP
5x5 |
36% |
10%
+15dBm |
High-Power Path Gain: 27dB
Low-Power Path Gain: 15dB
N-CDMA PAE: 36% at +28dBm
Shutdown Mode
TDMA PAE: 42% at +30.5dBm
W-CDMA PAE: 37% at +28dBm |
表2. 针对市场选择
|
Market |
Part |
Advantages |
Specs |
|
Cellular CDMA (U.S.) |
MAX2265 |
Low-cost, Simple Layout, Few External Components,
High-peak Efficiency |
Efficiency = 37% (ACPR = -45)
Efficiency = 35% (ACPR = -48) |
|
MAX2264
MAX2266 |
Low-cost, World''s Lowest Talk Current |
Talk Current=55mA
16dBm Efficiency =12/18% (2264/66)
Peak Efficiency =32% |
|
MAX2281 |
Small Size Ultra-chip Scale Package
(2.5mm x 2.5mm),
Fixed or Dynamic Biasing |
PAE: 14% at +16dBm Output Power for CDMA
PAE: 31% at +29dBm Output Power for CDMA
PAE: 40% at +31.5dBm Output Power for AMPS
PAE: 43% at +30.5dBm Output Power for TDMA |
|
MAX2251 |
Small Size Ultra-chip Scale Package
(2.06mm x 2.06mm),
Integrated Power Detector,
Low-power Shutdown Mode |
Gain: 28dB
PAE: 41% at +30dBm for TDMA
PAE: 51% at +32.4dBm for AMPS |
|
CDMA (Japan) |
MAX2268 |
Low-cost, Simple Layout, Few External Components,
High-peak Efficiency |
Efficiency = 37% (ACPR = -45)
Efficiency = 35% (ACPR = -48) |
|
MAX2267
MAX2269 |
Low-cost, World''s Lowest Talk Current |
Talk Current=55mA
16dBm Efficiency =12/18% (2264/66 and ACPR=-45)
Peak Efficiency =33% (ACPR=-45) |
|
MAX2282 |
Small Size Ultra-chip Scale Package
(2.5mm x 2.5mm) |
PAE: 17% at +18dBm Output Power for JCDMA
PAE: 34% at +27.5dBm Output Power for JCDMA
23dB Low-Power Mode Gain
28dB High-Power Mode Gain |
|
PCS CDMA |
MAX2291 |
Small Size Ultra-chip Scale Package
(2.5mm x 2.5mm), Shutdown |
High-Power Path Gain: 27dB
Low-Power Path Gain: 15dB
N-CDMA PAE: 36% at +28dBm
TDMA PAE: 42% at +30.5dBm
W-CDMA PAE: 37% at +28dBm |
|
Cellular TDMA |
MAX2281 |
Shutdown Mode |
PAE: 14% at +16dBm Output Power for CDMA
PAE: 31% at +29dBm Output Power for CDMA
PAE: 40% at +31.5dBm Output Power for AMPS
PAE: 43% at +30.5dBm Output Power for TDMA |
|
MAX2251 |
Small Size Ultra-chip Scale Package
(2.06mm x 2.06mm),
Integrated Power Detector,
Low-power Shutdown Mode |
Gain: 28dB
PAE: 41% at +30dBm for TDMA |
|
PCS TDMA |
MAX2291 |
Small Size Ultra-chip Scale Package
(2.5mm x 2.5mm), Shutdown |
High-Power Path Gain: 27dB
Low-Power Path Gain: 15dB
N-CDMA PAE: 36% at +28dBm
TDMA PAE: 42% at +30.5dBm
W-CDMA PAE: 37% at +28dBm |
|
PDC |
MAX2265 |
Low-cost, Simple Layout, Few External Components,
High-peak Efficiency |
Efficiency=40% (ACPR=-28)
Pout=30dBm |
|
AMPs |
MAX2251 |
Small Size Ultra-chip Scale Package
(2.06mm x 2.06mm),
Integrated Power Detector,
Low-power Shutdown Mode |
Efficiency=51%
Pout=32.4dBm |
|
MAX2265 |
Low-cost, Simple Layout, Few External Components,
High-peak Efficiency |
PAE: 48% at +31.5dBm Output Power for AMPS |
|
WLL |
MAX2265 |
Low-cost, Simple Layout, Few External Components,
High-peak Efficiency |
Efficiency=37% (ACPR=-45)
Efficiency=35% (ACPR=-48) |
|
900MHz ISM |
MAX2235 |
Analog Gain Control, Auto Power Ramp, Shutdown |
PAE: 47% at +30.3dBm Output Power |
|
MAX2251 |
Small Size Ultra-chip Scale Package
(2.06mm x 2.06mm),
Integrated Power Detector,
Low-power Shutdown Mode |
Gain: 28dB
PAE: 41% at +30dBm for TDMA
PAE: 51% at +32.4dBm for AMPS |
|
Bluetooth
HomeRF
2.4GHz DECT |
MAX2240 |
Small Size Ultra-chip Scale Package
(1.56mm x 1.56mm),
2-bit Digital Power Control |
+20dBm, Efficiency =30% |
|
MAX2244 |
Closed-loop Analog Power Control,
Small Size Ultra-chip Scale Package
(1.56mm x 1.56mm) |
+22dBm, Efficiency = 34.2%
Power control range 0.5V to 2V |
|
MAX2245 |
Closed-loop Analog Power Control,
Small Size Ultra-chip Scale Package
(1.56mm x 1.56mm) |
+22dBm, Efficiency = 29.2%
Power control range 0.9V to 2V |
|
MAX2246 |
Closed-loop Analog Power Control,
Small Size Ultra-chip Scale Package
(1.56mm x 1.56mm) |
+20dBm, Efficiency = 27.8%
Power control range 0.5V to 2V |
|
Cellular TDMA/AMPS
Dual Mode |
MAX2251 |
Small Size Ultra-chip Scale Package
(2.06mm x 2.06mm),
Integrated Power Detector,
Low-power Shutdown Mode |
Gain: 28dB
PAE: 41% at +30dBm for TDMA
PAE: 51% at +32.4dBm for AMPS |
|
802.11b WLAN |
MAX2242 |
Integrated Power Detector,
Dynamic Bias Control,
Output Power Tunable from +10dBm to +22dBm |
+22.5dBm Output Power at -33dBc ACPR for 802.11B
28.5dB Power Gain |
16-pin PQSOP Package Outline
16/20-pin TSSOP-EP Package Outline
16-pin SO/QSOP Package Outline
8-pin PSOPII Package Outline
9-pin USCP Package Outline
12-pin USCP Package Outline
25-pin USCP Package Outline |
