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參數(shù)資料
| 型號： | TC7650CPA |
| 廠商： | Microchip Technology Inc. |
| 元件分類： | 運動控制電子 |
| 英文描述： | Chopper Stabilized Operational Amplifier |
| 中文描述： | 斬波穩(wěn)定運算放大器 |
| 文件頁數(shù)： | 4/7頁 |
| 文件大?。?/td> | 90K |
| 代理商： | TC7650CPA |
3-276
TELCOM SEMICONDUCTOR, INC.
Clock Operation
The internal oscillator is set for a 200Hz nominal chop-
ping frequency on both the 8- and 14-pin DIPs. With the
14-pin DIP TC7650, the 200Hz internal chopping frequency
is available at the internal clock output (pin 12). A 400Hz
nominal signal will be present at the external clock input pin
(pin 13) with INT/EXT high or open. This is the internal clock
signal before a divide-by-two operation.
Figure 1. TC7650 Contains a Nulling and Main Amplifier. Offset Correction Voltages Are Stored on Two External Capacitors.
The 14-pin DIP device can be driven by an external
clock. The INT/EXT input (pin 14) has an internal pull-up and
may be left open for internal clock operation. If an external
clock is used, INT/EXT must be tied to V
SS
(pin 7) to disable
the internal clock. The external clock signal is applied to the
external clock input (pin 13).
The external clock amplitude should swing between
V
DD
and ground for power supplies up to
±
6V and between
V
+
and V
+
– 6V for higher supply voltages.
At low frequencies the external clock duty cycle is not
critical, since an internal divide-by-two gives the desired
50% switching duty cycle. The offset storage correction
capacitors are charged only when the external clock input is
high. A 50% to 80% external clock positive duty cycle is
desired for frequencies above 500Hz to guarantee tran-
sients settle before the internal switches open.
The external clock input can also be used as a strobe
input. If a strobe signal is connected at the external clock
input so that it is LOW during the time an overload signal is
applied, neither capacitor will be charged. The leakage
currents at the capacitors pins are very low. At 25
°
C a typical
TC7650 will drift less than 10
μ
V/sec.
Output Clamp
Chopper-stabilized systems can show long recovery
times from overloads. If the output is driven to either supply
rail, output saturation occurs. The inputs are no longer held
at a "virtual ground." The V
OS
null circuit treats the differen-
tial signal as an offset and tries to correct it by charging the
external capacitors. The nulling circuit also saturates. Once
the input signal returns to normal, the response time is
lengthened by the long recovery time of the nulling amplifier
and external capacitors.
Through an external clamp connection, the TC7650
Figure 2. Nulling Capacitor Connection
Nulling Capacitor Connection
The offset voltage correction capacitors are connected
to C
A
and C
B
. The common capacitor connection is made to
V
SS
(pin 4) on the 8-pin packages and to capacitor return
(C
R
, pin 8) on the 14-pin packages. The common connec-
tion should be made through a separate PC trace or wire to
avoid voltage drops. The capacitors outside foil, if possible,
should be connected to C
R
or V
SS
.
NULL
–
MAIN
AMPLIFIER
NULL
–
NULL
AMPLIFIER
GAIN = AM
B
A
B
A
+
CB
CA
TC7650
+
V–
V+
GAIN = AN
OSN
VOUT
ANALOG INPUT
VDD
VSS
6
4
8
1
3
2
7
CA
CB
+
–
VDD
TC7650
10
1
8
2
5
4
11
CA
CB
+
–
7
VSS
14-PIN PACKAGE
8-PIN PACKAGE
TC7650
TC7650
CHOPPER-STABILIZED
OPERATIONAL AMPLIFIER
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| 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 |
| TC7652 | Low Noise, Chopper Stabilized Operational Amplifier |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 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 |
| 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 |
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