Vbias Cd 10 - 200pF Photodiode " />
參數(shù)資料
型號(hào)： LMH6642MF/NOPB
廠商： National Semiconductor
文件頁(yè)數(shù)： 11/33頁(yè)
文件大?。?/td> 0K
描述： IC OPAMP LP 3V 75MA RR SOT23-5
產(chǎn)品培訓(xùn)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(biāo)準(zhǔn)包裝： 1
系列： PowerWise®
放大器類(lèi)型： 電壓反饋
電路數(shù)： 1
輸出類(lèi)型： 滿(mǎn)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(lèi)型： 表面貼裝
封裝/外殼： SC-74A，SOT-753
供應(yīng)商設(shè)備封裝： SOT-23-5
包裝： 標(biāo)準(zhǔn)包裝
產(chǎn)品目錄頁(yè)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(chēng)： LMH6642MFDKR
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(guān)PDF資料
PDF描述
GBC19SABN-M30 CONN HEADER 19PS .100 SINGLE SMD
1-640384-9 CONN HEADER 19POS VERT .156 TIN
1206SFH120F/24-2 FUSE 12A 24V FAST SMD 1206
1206SFH200F/24-2 FUSE 20A 24V FAST SMD 1206
5-87543-6 12 MODII HDR DRST UNSHRD .100
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LMH6642MFX 功能描述:運(yùn)算放大器 - 運(yùn)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(bǔ)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(fēng)格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel
LMH6642MFX/NOPB 功能描述:運(yùn)算放大器 - 運(yùn)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(bǔ)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(fēng)格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel
LMH6642MFXEP 制造商:NSC 制造商全稱(chēng):National Semiconductor 功能描述:Enhanced Plastic Low Power, 130MHz, 75mA Rail-to-Rail Output Amplifiers
LMH6642Q 制造商:TI 制造商全稱(chēng):Texas Instruments 功能描述:Low Power, 130MHz, 75mA Rail-to-Rail Output Amplifiers
LMH6642QMF 制造商:TI 制造商全稱(chēng):Texas Instruments 功能描述:Low Power, 130MHz, 75mA Rail-to-Rail Output Amplifiers
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