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參數(shù)資料
| 型號： | TC7650 |
| 廠商： | Microchip Technology Inc. |
| 英文描述： | Wallmount ULTRX Series Fiberglass Enclosure; NEMA Type:1, 2, 4, 4X, 12, 13; Enclosure Material:Fiberglass; External Height:24.11"; External Width:16.24"; External Depth:8.64"; Enclosure Color:Light Gray; Approval Bodies:UL, CSA, VDE RoHS Compliant: No |
| 中文描述： | 斬波穩(wěn)定運算放大器 |
| 文件頁數(shù)： | 6/7頁 |
| 文件大?。?/td> | 90K |
| 代理商： | TC7650 |
3-278
TELCOM SEMICONDUCTOR, INC.
TC7650
CHOPPER-STABILIZED
OPERATIONAL AMPLIFIER
Figure 6. Input Guard Connection
INPUT
+
–
OUTPUT
R2
Inverting Amplifier
INPUT
+
–
OUTPUT
INPUT
+
–
OUTPUT
R2
R1
Noninverting Amplifier
R3*
R3*
SHOULD BE LOW
IMPEDANCE FOR
OPTIMUM GUARDING.
NOTE: R3
R1R2
R1
R2
+
R3*
R1
Other operational amplifiers may use this pin as an offset
or compensation point.
The minor modifications needed to retrofit a TC7650
into existing sockets operating at reduced power supply
voltages make prototyping and circuit verification straight-
forward.
Input Guarding
High impedance, low leakage CMOS inputs allow the
TC7650 to make measurements of high-impedance sources.
Stray leakage paths can increase input currents and de-
crease input resistance unless inputs are guarded. A guard
is a conductive PC trace surrounding the input terminals.
The ring connects to a low-impedance point at the same
potential as the inputs. Stray leakages are absorbed by the
low-impedance ring. The equal potential between ring and
inputs prevents input leakage currents. Typical guard con-
nections are shown in Figure 6.
The 14-pin DIP configuration has been specifically
designed to ease input guarding. The pins adjacent to the
inputs are unused.
In applications requiring low leakage currents, boards
should be cleaned thoroughly and blown dry after soldering.
Protective coatings will prevent future board contamination.
Component Selection
The two required capacitors, C
A
and C
B
, have optimum
values, depending on the clock or chopping frequency. For
the preset internal clock, the correct value is 0.1
μ
F. To
maintain the same relationship between the chopping fre-
quency and the nulling time constant, the capacitor values
should be scaled in proportion to the external clock, if used.
High-quality film-type capacitors (such as Mylar) are pre-
ferred; ceramic or other lower-grade capacitors may be
suitable in some applications. For fast settling on initial turn-
on, low dielectric absorption capacitors (such as polypro-
pylene) should be used. With ceramic capacitors, several
seconds may be required to settle to 1
μ
V.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| TC7650CPA | Chopper Stabilized Operational Amplifier |
| TC7650CPD | Chopper Stabilized Operational Amplifier |
| TC7650CPD | CHOPPER-STABILIZED OPERATIONAL AMPLIFIER |
| TC7650 | Wallmount ULTRX Series Fiberglass Enclosure; NEMA Type:1, 2, 4, 4X, 12, 13; Enclosure Material:Fiberglass; External Height:20.2"; External Width:16.22"; External Depth:12.64"; Enclosure Color:Light Gray; Leaded Process Compatible:No |
| TC7652 | LOW NOISE, CHOPPER-STABILIZED OPERATIONAL AMPLIFIER |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TC7650_13 | 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:Chopper Stabilized Operational Amplifier |
| TC7650CPA | 功能描述:運算放大器 - 運放 Low VOS CMOS 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(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
| TC7650CPD | 功能描述:運算放大器 - 運放 Low VOS CMOS 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(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
| TC7650IJA | 功能描述:運算放大器 - 運放 Low VOS CMOS 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(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
| TC7650IJD | 功能描述:運算放大器 - 運放 Low VOS CMOS 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(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
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