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参数资料
| 型号： | MAX4000EBL+T |
| 厂商： | Maxim Integrated |
| 文件页数： | 13/19页 |
| 文件大小： | 0K |
| 描述： | IC CTLR RF DET 2.5GHZ 45DB 8UCSP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 频率： | 2.5GHz |
| 增益： | 10dB |
| RF 型： | 手机，GSM，GPRS |
| 电源电压： | 2.7 V ~ 5.5 V |
| 电流 - 电源： | 5.9mA |
| 封装/外壳： | 8-UFBGA，FCBGA |
| 包装： | 带卷 (TR) |
2.5GHz 45dB RF-Detecting Controllers
ANTENNA
POWER AMPLIFIER
SHDN
V CC
OUTPUT
ENABLE
DELAY
XX
RF INPUT
-
RFIN
DET
DET
DET
DET
DET
gm
+
X1
OUT
CLPF
50 Ω
RFIN
MAX4000
V CC
V CC
10dB
10dB
10dB
10dB
V-I
SET
V CC
SHDN
OUT
0.1 μ F
GND
(PADDLE)
OFFSET
COMP
LOW-
NOISE
BANDGAP
MAX4000
DAC
C F
SET
CLPF
N.C.
GND
Figure 1. Functional Diagram
Detailed Description
The MAX4000/MAX4001/MAX4002 family of logarithmic
amplifiers (log amps) is comprised of four main amplifi-
er/limiter stages each with a small-signal gain of 10dB.
The output stage of each amplifier is applied to a full-
wave rectifier (detector). A detector stage also pre-
cedes the first gain stage. In total, five detectors each
separated by 10dB, comprise the log amp strip. Figure
1 shows the functional diagram of the log amps.
A portion of the PA output power is coupled to RFIN of
the log amp controller, and is applied to the log amp
strip. Each detector cell outputs a rectified current and
all cell currents are summed and form a logarithmic
output. The detected output is applied to a high-gain
g m stage, which is buffered and then applied to OUT.
OUT is applied to the gain-control pin of the PA to close
the control loop. The voltage applied to SET determines
the output power of the PA in the control loop. The volt-
age applied to SET relates to an input power level
determined by the log amp detector characteristics.
Extrapolating a straight-line fit of the graph of SET vs.
RFIN provides the logarithmic intercept. Logarithmic
slope, the amount SET changes for each dB change of
RF input, is generally independent of waveform or ter-
mination impedance. The MAX4000/MAX4001/
MAX4002 slope at low frequencies is about 25mV/dB.
Variance in temperature and supply voltage does not
alter the slope significantly as shown in the Typical
Operating Characteristics .
The MAX4000/MAX4001/MAX4002 are specifically des-
igned for use in PA control applications. In a control
loop, the output starts at approximately 2.9V (with sup-
ply voltage of 3V) for the minimum input signal and falls
to a value close to ground at the maximum input. With a
portion of the PA output power coupled to RFIN, apply
a voltage to SET and connect OUT to the gain-control
pin of the PA to control its output power. An external
Figure 2. Controller Mode Application Circuit Block
capacitor from the CLPF pin to ground sets the band-
width of the PA control loop.
Transfer Function
Logarithmic slope and intercept determine the transfer
function of the MAX4000/MAX4001/MAX4002 family of
log amps. The change in SET voltage per dB change in
RF input defines the logarithmic slope. Therefore, a
250mV change at SET results in a 10dB change at
RFIN. The Log-Conformance plots (see Typical Oper-
ating Characteristics ) show the dynamic range of the
log amp family. Dynamic range is the range for which
the error remains within a band of ±1dB.
The intercept is defined as the point where the linear
response, when extrapolated, intersects the y-axis of
the Log-Conformance plot. Using these parameters,
the input power can be calculated at any SET voltage
level within the specified input range with the following
equation:
SET
RFIN = + IP
SLOPE
where SET is the set-point voltage, SLOPE is the loga-
rithmic slope (V/dB), RFIN is in either dBm or dBV and
IP is the logarithmic intercept point utilizing the same
units as RFIN.
Applications Information
Controller Mode
Figure 2 provides a circuit example of the MAX4000/
MAX4001/MAX4002 configured as a controller. The
MAX4000/MAX4001/MAX4002 require a 2.7V to 5.5V
supply voltage. Place a 0.1μF low-ESR, surface-mount
ceramic capacitor close to V CC to decouple the supply.
Electrically isolate the RF input from other pins (espe-
cially SET) to maximize performance at high frequencies
(especially at the high-power levels of the MAX4002).
The MAX4000 has an internal input-coupling capacitor
______________________________________________________________________________________
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX4000EUA | 功能描述:射频检测器 2.5GHz 45dB RF Detecting Ctlr RoHS:否 制造商:Skyworks Solutions, Inc. 配置: 频率范围:650 MHz to 3 GHz 最大二极管电容: 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:SC-88 封装:Reel |
| MAX4000EUA+ | 功能描述:射频检测器 2.5GHz 45dB RF Detecting Ctlr RoHS:否 制造商:Skyworks Solutions, Inc. 配置: 频率范围:650 MHz to 3 GHz 最大二极管电容: 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:SC-88 封装:Reel |
| MAX4000EUA+T | 功能描述:射频检测器 2.5GHz 45dB RF Detecting Ctlr RoHS:否 制造商:Skyworks Solutions, Inc. 配置: 频率范围:650 MHz to 3 GHz 最大二极管电容: 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:SC-88 封装:Reel |
| MAX4000EUA-T | 功能描述:射频检测器 2.5GHz 45dB RF Detecting Ctlr RoHS:否 制造商:Skyworks Solutions, Inc. 配置: 频率范围:650 MHz to 3 GHz 最大二极管电容: 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:SC-88 封装:Reel |
| MAX4001 | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:2.5GHz 45dB RF-Detecting Controllers |
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