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| 型号： | AD8305ACPZ-RL7 |
| 厂商： | Analog Devices Inc |
| 文件页数： | 10/24页 |
| 文件大小： | 0K |
| 描述： | IC LOGARITH CONV 100DB 16-LFCSP |
| 设计资源： | Interfacing ADL5315 to Translinear Logarithmic Amplifier (CN0056) Interfacing ADL5317 High Side Current Mirror to a Translinear Logarithmic Amplifier in an Avalanche Photodiode Power Detector |
| 标准包装： | 1 |
| 类型： | 对数转换器 |
| 应用： | 光纤 |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-VFQFN 裸露焊盘，CSP |
| 供应商设备封装： | 16-LFCSP-VQ |
| 包装： | 标准包装 |
| 产品目录页面： | 550 (CN2011-ZH PDF) |
| 其它名称： | AD8305ACPZ-RL7DKR |
AD8305
Rev. B | Page 18 of 24
REVERSING THE INPUT POLARITY
Some applications may require interfacing to a circuit that
sources current rather than sinks current, such as connecting to
the cathode side of a photodiode. Figure 40 shows the use of a
current mirror circuit. This allows for simultaneous monitoring
of the optical power at the cathode, and a data recovery path
using a transimpedance amplifier at the anode. The modified
Wilson mirror provides a current gain very close to unity and a
high output resistance. Figure 41 shows measured transfer
function and law conformance performance of the AD8305 in
conjunction with this current mirror interface.
2.5V
0.1F
5V
0V
1nF
200k
MAT03
DATA PATH
5V
0.1F
TIA
IIN ≈ IPD
10nA TO 1mA
IPD 1k
1nF
OUTPUT
VOUT = 0.2 ×
log10 (IPD/1nA)
AD8305
12
11
10
9
1
2
3
4
57
8
COMM COMM COMM COMM
16
13
14
15
VSUM
VRDZ
VREF
IREF
INPT
VOUT
SCAL
BFIN
VLOG
VNEG VNEG VPOS
6
03
05
3-
0
39
Figure 40. Wilson Current Mirror for Cathode Interfacing
IPD (A)
1.4
0
V
LO
G
(V
)
1.2
1.0
0.8
0.6
0.4
0.2
1.00
0.75
0
1.6
0.50
–1.00
–0.75
–0.50
–0.25
0.25
+5V
+3V
5V
+5V
+3V
ER
R
O
R
;d
B
(1
0m
V/
d
B
)
1n
10n
100n
1
10
100
1m
10m
0
30
53
-04
0
Figure 41. Log Output and Error Using Current Mirror with Various Supplies
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相关代理商/技术参数 |
参数描述 |
|---|---|
| AD8305BRU | 制造商:Analog Devices 功能描述:- Bulk |
| AD8305-EVAL | 制造商:Analog Devices 功能描述:Evaluation Board For IC Log Amp Single 12V 制造商:Analog Devices 功能描述:AD8305 EVALUATION BOARD - Bulk |
| AD8305-EVALZ | 制造商:Analog Devices 功能描述:EVALUATION BOARDS - Bulk |
| AD8306 | 制造商:AD 制造商全称:Analog Devices 功能描述:5 MHz-400 MHz 100 dB High Precision Limiting-Logarithmic Amplifier |
| AD8306ACHIPS | 制造商:AD 制造商全称:Analog Devices 功能描述:5 MHz-400 MHz 100 dB High Precision Limiting-Logarithmic Amplifier |
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