参数资料
| 型号： | AD8317ACPZ-R7 |
| 厂商： | Analog Devices Inc |
| 文件页数： | 6/20页 |
| 文件大小： | 0K |
| 描述： | IC AMP LOG DETECT 8GHZ 8-LFCSP |
| 产品培训模块： | Choosing and Using RF Detectors |
| 标准包装： | 1 |
| 类型： | 对数放大器 |
| 应用： | 接收器信号强度指示（RSSI） |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-VFDFN 裸露焊盘 |
| 供应商设备封装： | 8-LFCSP-VD（3x2） |
| 包装： | 标准包装 |
| 产品目录页面： | 550 (CN2011-ZH PDF) |
| 其它名称： | AD8317ACPZ-R7DKR |
AD8317
Rev. B | Page 14 of 20
INLO
INHI
GAIN
OPLO
OPHI
DIRECTIONAL
COUPLER
ATTENUATOR
VPSx
COMx
ADL5330
+5V
COMM
VOUT
VPOS
VSET
INHI
INLO
CLPF
AD8317
LOG AMP
DAC
RF OUTPUT
SIGNAL
4.12k
10k
SETPOINT
VOLTAGE
1nF
47nF
120nH
100pF
TADJ
18k
52.3
RF INPUT
SIGNAL
05
54
1-
03
0
Figure 30. AD8317 Operating in Controller Mode to Provide Automatic Gain Control Functionality in Combination with the ADL5330
Figure 31 shows the transfer function of the output power vs.
the setpoint voltage over temperature for a 900 MHz sine wave
with an input power of 1.5 dBm. Note that the power control
of the AD8317 has a negative sense. Decreasing VSET, which
corresponds to demanding a higher signal from the ADL5330,
increases gain.
The AGC loop is capable of controlling signals just under the
full 60 dB gain control range of the ADL5330. The performance
over temperature is most accurate over the highest power range,
where it is generally most critical. Across the top 40 dB range
of output power, the linear conformance error is well within
±0.5 dB over temperature.
–50
–40
–30
–10
0
10
20
30
OU
TP
U
T
P
OWE
R
(
d
B
m
)
E
RRO
R
(
d
B)
–20
–4
–3
0
1
2
3
4
–1
–2
0.2
0.4
0.6
0.8
1.0
1.4
1.8
2.0
SETPOINT VOLTAGE (V)
1.6
1.2
05
54
1-
0
31
Figure 31. ADL5330 Output Power vs. AD8317 Setpoint Voltage, PIN = 1.5 dBm
For the AGC loop to remain in equilibrium, the AD8317 must
track the envelope of the ADL5330 output signal and provide
the necessary voltage levels to the ADL5330 gain control input.
Figure 32 shows an oscilloscope screenshot of the AGC loop
depicted in Figure 30. A 100 MHz sine wave with 50% AM
modulation is applied to the ADL5330. The output signal from
the VGA is a constant envelope sine wave with amplitude corre-
sponding to a setpoint voltage at the AD8317 of 1.5 V. Also
shown is the gain control response of the AD8317 to the
changing input envelope.
CH1 200mV
CH3 50.0mV
A CH2
820mV
05
54
1-
0
32
M2.00ms
T
640.00s
1
3
2
AM MODULATED INPUT
AD8317 OUTPUT
ADL5330 OUTPUT
Ch2 200mV
Figure 32. Oscilloscope Screenshot Showing an AM Modulated Input Signal
and the Response from the AD8317
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相关代理商/技术参数 |
参数描述 |
|---|---|
| AD8317ACPZ-R7 | 制造商:Analog Devices 功能描述:IC LOGARITHMIC AMPLIFIER 20NS LFCSP-8 |
| AD8317ACPZ-WP | 制造商:Analog Devices 功能描述: |
| AD8317-EVAL | 制造商:AD 制造商全称:Analog Devices 功能描述:1 MHz to 10 GHz, 50 dB Log Detector/Controller |
| AD8317-EVALZ | 制造商:Analog Devices 功能描述:EVAL KIT FOR 1 MHZ TO 10 GHZ, 50 DB LOG DETECTOR/CNTRLR - Bulk 制造商:Analog Devices 功能描述:EVAL BOARD, AD8317 LOG DETECTOR/CNTRL, Silicon Manufacturer:Analog Devices, Silicon Core Number:AD8317, Kit Application Type:RF / IF, Kit Contents:Eval Board AD8317, Features:(Not Applicable) |
| AD8318 | 制造商:AD 制造商全称:Analog Devices 功能描述:1 MHz to 8 GHz, 70 dB Logarithmic Detector/Controller |
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