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參數(shù)資料
| 型號： | TC7650CPD |
| 廠商： | TelCom Semiconductor, Inc. |
| 元件分類： | 運(yùn)算放大器 |
| 英文描述： | CHOPPER-STABILIZED OPERATIONAL AMPLIFIER |
| 中文描述： | 斬波穩(wěn)定運(yùn)算放大器 |
| 文件頁數(shù)： | 5/7頁 |
| 文件大?。?/td> | 90K |
| 代理商： | TC7650CPD |
3-277
TELCOM SEMICONDUCTOR, INC.
7
6
5
4
3
1
2
8
Figure 4. Noninverting Amplifier With Optional Clamp
Figure 3. Internal Clamp Circuit
INTERNAL
POSITIVE CLAMP BIAS V+
+
T
P-CHANNEL
OUTPUT
CLAMP PIN
N-CHANNEL
INTERNAL
NEGATIVE CLAMP BIAS V–
T
V–
TC7650
OUTPUT PIN
≈
≈
TC7650
+
–
C
R
C
OUTPUT
INPUT
FOR FULL CLAMP EFFECT.
R2
R1
+ ( R1
R2
≥
100k
R3
0.1μF
CONNECT TO V
ON 8-PIN DIP.
*
SS
*
R
CLAMP
3
eliminates the overload recovery problem by reducing the
feedback network gain before the output voltage reaches
either supply rail.
The output clamp circuit is shown in Figure 3, with typical
inverting and noninverting circuit connections shown in
Figures 4 and 5. Output voltage versus clamp circuit current
characteristics are shown in the typical operating curves.
For the clamp to be fully effective, the impedance across the
clamp output should be greater than 100k
.
Latch-Up Avoidance
Junction-isolated CMOS circuits inherently include a
parasitic 4-layer (p-n-p-n) structure which has characteris-
tics similar to an SCR. Under certain circumstances this
junction may be triggered into a low-impedance state, result-
ing in excessive supply current. To avoid this condition, no
voltage greater than 0.3V beyond the supply rails should be
applied to any pin. In general, the amplifier supplies must be
established either at the same time or before any input
signals are applied. If this is not possible, the drive circuits
must limit input current flow to under 0.1mA to avoid latch-
up.
Thermoelectric Potentials
Precision DC measurements are ultimately limited by
thermoelectric potentials developed in thermocouple junc-
tions of dissimilar metals, alloys, silicon, etc. Unless all
junctions are at the same temperature, thermoelectric volt-
ages, typically around 0.1
μ
V/
°
C, but up to tens of
μ
V/
°
C for
some materials, will be generated. In order to realize the
benefits extremely-low offset voltages provide, it is essential
to take special precautions to avoid temperature gradients.
All components should be enclosed to eliminate air move-
ment, especially those caused by power-dissipating ele-
ments in the system. Low thermoelectric-coefficient con-
nections should be used where possible and power supply
voltages and power dissipation should be kept to a mini-
mum. High-impedance loads are preferable, and separation
from surrounding heat-dissipating elements is advised.
Pin Compatibility
On the 8-pin mini-DIP TC7650, the external null storage
capacitors are connected to pins 1 and 8. On most other
operational amplifiers these are left open or are used for
offset potentiometer or compensation capacitor connec-
tions.
For OP05 and OP07 operational amplifiers, the replace-
ment of the offset null potentiometer between pins 1 and 8
by two capacitors from the pins to V
SS
will convert the OP05/
07 pin configurations for TC7650 operation. For LM108
devices, the compensation capacitor is replaced by the
external nulling capacitors. The LM101/748/709 pinouts
are modified similarly by removing any circuit connections to
pin 5. On the TC7650, pin 5 is the output clamp connection.
Figure 5. Inverting Amplifier with Optional Clamp
TC7650
CLAMP
+
–
C
R
C
R1
OUTPUT
0.1 μ
0.1μ
INPUT
R2
FOR FULL CLAMP
EFFECT.
(R1
R2
≥
100k
*
CONNECT TO V
ON 8-PIN DIP.
*
R
–
CHOPPER-STABILIZED
OPERATIONAL AMPLIFIER
TC7650
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| 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 |
| TC7652 | Low Noise, Chopper Stabilized Operational Amplifier |
| TC7652CPA | Low Noise, Chopper Stabilized Operational Amplifier |
| TC7652CPD | Low Noise, Chopper Stabilized Operational Amplifier |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TC7650IJA | 功能描述:運(yùn)算放大器 - 運(yùn)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(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 |
| TC7650IJD | 功能描述:運(yùn)算放大器 - 運(yùn)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(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 |
| TC7652 | 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:Low Noise, Chopper Stabilized Operational Amplifier |
| TC7652_13 | 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:Low Noise, Chopper Stabilized Operational Amplifier |
| TC7652CPA | 功能描述:運(yùn)算放大器 - 運(yùn)放 Low Noise Op 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(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 |
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