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参数资料
| 型号： | MAX2016ETI+T |
| 厂商： | Maxim Integrated |
| 文件页数： | 15/20页 |
| 文件大小： | 0K |
| 描述： | IC DETECT/CNTRL LOG 28-TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 频率： | 30kHz ~ 2.5GHz |
| RF 型： | 手机，GSM，EDGE，CDMA |
| 输入范围： | -70dBm ~ 10dBm |
| 精确度： | ±1dB |
| 电源电压： | 2.7 V ~ 5.25 V |
| 电流 - 电源： | 16mA |
| 包装： | 带卷 (TR) |
| 封装/外壳： | 28-WFQFN 裸露焊盘 |
LF-to-2.5GHz Dual Logarithmic Detector/
Controller for Power, Gain, and VSWR Measurements
Power-Controller Mode
The MAX2016 can also be used as a power detector/
controller within an AGC loop. Figure 7 depicts a sce-
nario where the MAX2016 is employed as the AGC cir-
cuit. As shown in the figure, the MAX2016 monitors the
OUTA and OUTB Slope Adjustment
The transfer slope function of OUTA and OUTB can be
increased from its nominal value by varying resistors
R1 and R2 (see the Typical Application Circuit ). The
equation controlling the slope is:
SLOPE OUTA OR OUTB = ? 9
?
? ( R 1 or R 2 ) + 40 k ?
? ?
output of the PA through a directional coupler. An inter-
nal differencing amplifier (Figure 5) compares the
detected signal with a reference voltage determined by
V SET_ . The differencing amplifier increases or decreas-
? mV ?
? dB ?
? ?
20 k
es the voltage at OUT_, according to how closely the
detected signal level matches the V SET_ reference. The
MAX2016 maintains the power of the PA to a level
determined by the voltage applied to SET_.
Since the logarithmic detector responds to any ampli-
tude modulation being carried by the carrier signal, it
OUTD Slope Adjustment
The transfer slope function of OUTD can be increased
from its nominal value by varying resistor R3 (see the
Typical Application Circuit ). The equation controlling
the slope is:
SLOPE OUTD = ? ? 25
mV ? ? R 3 + 20 k ?
dB ? ?
?
? ? ?
may be necessary to insert an external lowpass filter
between the differencing amplifier output
(OUTA/OUTB) and the gain-control element to remove
?
?
20 k
this modulation signal.
Input Highpass Filters
The MAX2016 integrates a programmable highpass fil-
ter on each RF input. The lower cutoff frequency of the
MAX2016 can be decreased by increasing the external
capacitor value between FA1 and FA2 or FB1 and FB2.
POWER AMPLIFIER
By default, with no capacitor connecting FA1 and FA2
or FB1 and FB2, the lower cutoff frequency is 20MHz.
TRANSMITTER
GAIN-CONTROL INPUT
COUPLER
Using the following equation determines the lowest
operating frequency:
LOWPASS
FILTER
OUTA/
OUTB
RFINA/
LOGARITHMIC RFINB
DETECTOR
frequency =
1
2 π RC
SETA/
where R = 2 Ω .
SET-POINT
DAC
SETB
20k Ω
Differential Output Video Filter
The bandwidth and response time difference of the out-
put amplifier can be controlled with the external capaci-
tor, C 15 , connected between FV1 and FV2. With no
20k Ω
MAX2016
external capacitor, the bandwidth is greater than 20MHz.
The following equation determines the bandwidth of the
amplifier difference:
Figure 7. In Power-Controller Mode, the DC Voltage at OUTA or
frequency =
1
2 π RC
OUTB Controls the Gain of the PA, Leading to a Constant
Output Power Level ( Note: Only one controller channel is
shown within the figure. Since the MAX2016 is a dual con-
troller/detector, the second channel can be easily implemented
by using the adjacent set of input and output connections.)
where R = 1.8k Ω .
Use a video bandwidth lower than the anticipated low-
est amplitude-modulation frequency range to yield the
greatest accuracy in tracking the average carrier
power for high peak-to-average ratio waveforms.
______________________________________________________________________________________
15
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