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參數(shù)資料
| 型號： | AD8305ACP-R2 |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 10/24頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC LOGARITHM CONV 100DB 16-LFCSP |
| 產(chǎn)品變化通告： | Product Discontinuance 27/July/2010 |
| 設(shè)計資源： | Interfacing ADL5315 to Translinear Logarithmic Amplifier (CN0056) Interfacing ADL5317 High Side Current Mirror to a Translinear Logarithmic Amplifier in an Avalanche Photodiode Power Detector |
| 標準包裝： | 1 |
| 類型： | 對數(shù)轉(zhuǎn)換器 |
| 應用： | 光纖 |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 16-VFQFN 裸露焊盤，CSP |
| 供應商設(shè)備封裝： | 16-LFCSP-VQ |
| 包裝： | 標準包裝 |
| 其它名稱： | AD8305ACP-R2DKR |
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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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AD8305ACP-REEL7 | 制造商:Analog Devices 功能描述:SP Amp LOG Amp Single R-R O/P ±6V/12V 16-Pin LFCSP EP T/R |
| AD8305ACPZ | 制造商:AD 制造商全稱:Analog Devices 功能描述:100 dB Range (10 nA to 1 mA) ogarithmic Converter |
| AD8305ACPZ-R2 | 功能描述:IC AMP LOG CONV 100DB 16-LFCSP RoHS:是 類別:集成電路 (IC) >> 線性 - 放大器 - 專用 系列:- 產(chǎn)品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:60 系列:- 類型:可變增益放大器 應用:CATV 安裝類型:表面貼裝 封裝/外殼:20-WQFN 裸露焊盤 供應商設(shè)備封裝:20-TQFN-EP（5x5） 包裝:托盤 |
| AD8305ACPZ-RL7 | 功能描述:IC LOGARITH CONV 100DB 16-LFCSP RoHS:是 類別:集成電路 (IC) >> 線性 - 放大器 - 專用 系列:- 產(chǎn)品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:60 系列:- 類型:可變增益放大器 應用:CATV 安裝類型:表面貼裝 封裝/外殼:20-WQFN 裸露焊盤 供應商設(shè)備封裝:20-TQFN-EP（5x5） 包裝:托盤 |
| AD8305BRU | 制造商:Analog Devices 功能描述:- Bulk |
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