参数资料
| 型号： | AD8305ACPZ-R2 |
| 厂商： | Analog Devices Inc |
| 文件页数： | 10/24页 |
| 文件大小： | 0K |
| 描述： | IC AMP LOG 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： | 250 |
| 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： | 带卷 (TR) |
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
相关PDF资料 |
PDF描述 |
|---|---|
| AD8306AR | IC LOGARITHM AMP 5-400MHZ 16SOIC |
| AD8307AN | IC LOGARITHMIC AMP 8-DIP |
| AD8309ARU | IC LOGARITHM AMP 100DB 16-TSSOP |
| AD830ANZ | IC VIDEO DIFF AMP HS 8-DIP |
| AD8310ARM | IC LOGARITHMIC AMP 95DB 8-MSOP |
相关代理商/技术参数 |
参数描述 |
|---|---|
| AD8305ACPZ-RL7 | 功能描述:IC LOGARITH CONV 100DB 16-LFCSP RoHS:是 类别:集成电路 (IC) >> 线性 - 放大器 - 专用 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:60 系列:- 类型:可变增益放大器 应用:CATV 安装类型:表面贴装 封装/外壳:20-WQFN 裸露焊盘 供应商设备封装:20-TQFN-EP（5x5） 包装:托盘 |
| 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 |
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