Vbias Cd 10 - 200pF Photodiode " />
參數(shù)資料
型號： LMH6642MA/NOPB
廠商： National Semiconductor
文件頁數(shù)： 11/33頁
文件大?。?/td> 0K
描述： IC OP AMP R-R LP 3V 75MA 8-SOIC
產(chǎn)品培訓模塊： High Speed Amplifiers for Video Applications - Part 1
High Speed Amplifiers for Video Applications - Part 2
High Speed Amplifiers for Video Applications - Part 3
標準包裝： 95
系列： PowerWise®
放大器類型： 電壓反饋
電路數(shù)： 1
輸出類型： 滿擺幅
轉(zhuǎn)換速率： 135 V/µs
-3db帶寬： 130MHz
電流 - 輸入偏壓： 1.6µA
電壓 - 輸入偏移： 1000µV
電流 - 電源： 2.7mA
電流 - 輸出 / 通道： 75mA
電壓 - 電源，單路/雙路(±)： 2.7 V ~ 12.8 V，±1.35 V ~ 6.4 V
工作溫度： -40°C ~ 85°C
安裝類型： 表面貼裝
封裝/外殼： 8-SOIC（0.154"，3.90mm 寬）
供應商設備封裝： 8-SOIC
包裝： 管件
產(chǎn)品目錄頁面： 1270 (CN2011-ZH PDF)
配用： LMH730227-ND - BOARD EVALUATION FOR SOIC PKG
LMH730165-ND - BOARD EVALUATION
LMH730216-ND - BOARD EVAL HS MONO AMP SOT23
其它名稱： *LMH6642MA
*LMH6642MA/NOPB
LMH6642MA
200 mV/DIV
20 ns/DIV
+
-
Vbias
Cd
10
-
200pF
Photodiode
Rd
C1
100nF
Q1
2N3904
R5
510:
R2
1.8k:
D1
1N4148
R3
1k:
R11
910
:
R10
1k:
-1mAPP
Cf
5pF
Rf
1k:
VCC =
+5V
Rbias
Photodiode
Equivalent
Circuit
Id
×100k:
Vout
+5V
x
SQRT
GBWP/(2SRF CIN)
fP =
CF =
SQRT
(CIN)/(2S GBWP RF)
SNOS966P – MAY 2001 – REVISED MARCH 2013
No matter how low an Rf is selected, there is a need for Cf in order to stabilize the circuit. The reason for this is
that the Op Amp input capacitance and Q1 equivalent collector capacitance together (CIN) will cause additional
phase shift to the signal fed back to the inverting node. Cf will function as a zero in the feedback path counter-
acting the effect of the CIN and acting to stabilized the circuit. By proper selection of Cf such that the Op Amp
open loop gain is equal to the inverse of the feedback factor at that frequency, the response is optimized with a
theoretical 45° phase margin.
(1)
where GBWP is the Gain Bandwidth Product of the Op Amp
Optimized as such, the I-V converter will have a theoretical pole, fp, at:
(2)
With Op Amp input capacitance of 3pF and an estimate for Q1 output capacitance of about 3pF as well, CIN =
6pF. From the typical performance plots, LMH6642/6643 family GBWP is approximately 57MHz. Therefore, with
Rf = 1k, from Equation 1 and Equation 2 above.
Cf = 4.1pF and fp = 39MHz
Figure 63. Single Supply Photodiode I-V Converter
For this example, optimum Cf was empirically determined to be around 5pF. This time domain response is shown
in Figure 64 below showing about 9ns rise/fall times, corresponding to about 39MHz for fp. The overall supply
current from the +5V supply is around 5mA with no load.
Figure 64. Converter Step Response (1VPP, 20 ns/DIV)
Copyright 2001–2013, Texas Instruments Incorporated
19
Product Folder Links: LMH6642 LMH6643 LMH6644
相關PDF資料
PDF描述
929710-01-07-RK CONN HEADER 14PS STR .100 DL TIN
TSW-105-14-F-S CONN HEADER 5POS .100" SNGL
929665-03-28-I CONN HEADER .100 DUAL STR 56POS
TSW-103-25-S-S-RA CONN HEADER 3POS .100" SNGL R/A
LT1491IS IC OP-AMP R-R IN/OUT QUAD 14SOIC
相關代理商/技術參數(shù)
參數(shù)描述
LMH6642MAX 功能描述:運算放大器 - 運放 RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel
LMH6642MAX/NOPB 功能描述:運算放大器 - 運放 RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel
LMH6642MF 功能描述:運算放大器 - 運放 RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel
LMH6642MF/NOPB 功能描述:運算放大器 - 運放 Sgl 3V 130Mhz,R-R Out Amp RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel
LMH6642MF/NOPB 制造商:Texas Instruments 功能描述:Operational Amplifier (Op-Amp) IC
發(fā)布緊急采購，3分鐘左右您將得到回復。

采購需求

(若只采購一條型號，填寫一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購。也可以進入我的后臺，查看報價

發(fā)布成功！您可以繼續(xù)發(fā)布采購。也可以進入我的后臺，查看報價

*型號 *數(shù)量 廠商 批號 封裝
添加更多采購

我的聯(lián)系方式

*
*
*