参数资料
| 型号： | TC7650CPA |
| 厂商： | Microchip Technology |
| 文件页数： | 10/14页 |
| 文件大小： | 0K |
| 描述： | IC OPAMP CHOPPER STAB 8DIP |
| 标准包装： | 60 |
| 放大器类型： | 断路器（零漂移） |
| 电路数： | 1 |
| 转换速率： | 2.5 V/µs |
| 增益带宽积： | 2MHz |
| 电流 - 输入偏压： | 1.5pA |
| 电压 - 输入偏移： | 0.7µV |
| 电流 - 电源： | 2mA |
| 电压 - 电源，单路/双路(±)： | 4.5 V ~ 16 V，±2.25 V ~ 8 V |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 通孔 |
| 封装/外壳： | 8-DIP（0.300"，7.62mm） |
| 供应商设备封装： | 8-PDIP |
| 包装： | 管件 |
| 产品目录页面： | 680 (CN2011-ZH PDF) |
| 其它名称： | 158-1135 158-1135-ND |
2002 Microchip Technology Inc.
DS21463B-page 5
TC7650
tion region, where the main amplifier takes over from
the null amplifier. The clock frequency sets the transi-
tion region.
3.3
Intermodulation
Previous chopper stabilized amplifiers have suffered
from intermodulation effects between the chopper fre-
quency and input signals. These arise because the
finite AC gain of the amplifier results in a small AC sig-
nal at the input. This is seen by the zeroing circuit as an
error signal, which is chopped and fed back, thus inject-
ing sum and difference frequencies, and causing dis-
turbances to the gain and phase versus frequency
characteristics near the chopping frequency. These
effects are substantially reduced in the TC7650 by
feeding the nulling circuit with a dynamic current corre-
sponding to the compensation capacitor current in such
a way as to cancel that portion of the input signal due
to a finite AC gain. The intermodulation and gain/phase
disturbances are held to very low values, and can gen-
erally be ignored.
FIGURE 3-1:
TC7650 CONTAINS A NULLING AND MAIN AMPLIFIER. OFFSET CORRECTION
VOLTAGES ARE STORED ON TWO EXTERNAL CAPACITORS.
FIGURE 3-2:
NULLING CAPACITOR
CONNECTION
3.4
Nulling Capacitor Connection
The offset voltage correction capacitors are connected
to CA and CB. The common capacitor connection is
made to VSS (Pin 4) on the 8-pin packages and to
capacitor return (CRETN, Pin 8) on the 14-pin packages.
The common connection should be made through a
separate PC traceor wiretoavoid voltagedrops. The
capacitors outside foil, if possible, should be connected
to CRETN or VSS.
3.5
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 200 Hz internal chopping fre-
quency 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 oper-
ation.
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 VSS
(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
VDD 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 exter-
nal clock input is high. A 50% to 80% external clock
Null
Main
Amplifier
Null
Amplifier
Gain = AM
B
A
B
A
+
CB
CA
TC7650
Null
-
+
V-
V+
Gain = AN , Offset = VOSN
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
-
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相关代理商/技术参数 |
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| TC7650CPD | 功能描述:运算放大器 - 运放 Low VOS CMOS RoHS:否 制造商:STMicroelectronics 通道数量:4 共模抑制比（最小值）:63 dB 输入补偿电压:1 mV 输入偏流（最大值）:10 pA 工作电源电压:2.7 V to 5.5 V 安装风格:SMD/SMT 封装 / 箱体:QFN-16 转换速度:0.89 V/us 关闭:No 输出电流:55 mA 最大工作温度:+ 125 C 封装:Reel |
| TC7650IJA | 功能描述:运算放大器 - 运放 Low VOS CMOS RoHS:否 制造商:STMicroelectronics 通道数量:4 共模抑制比（最小值）:63 dB 输入补偿电压:1 mV 输入偏流（最大值）:10 pA 工作电源电压:2.7 V to 5.5 V 安装风格:SMD/SMT 封装 / 箱体:QFN-16 转换速度:0.89 V/us 关闭:No 输出电流:55 mA 最大工作温度:+ 125 C 封装:Reel |
| TC7650IJD | 功能描述:运算放大器 - 运放 Low VOS CMOS RoHS:否 制造商:STMicroelectronics 通道数量:4 共模抑制比（最小值）:63 dB 输入补偿电压:1 mV 输入偏流（最大值）:10 pA 工作电源电压:2.7 V to 5.5 V 安装风格:SMD/SMT 封装 / 箱体:QFN-16 转换速度:0.89 V/us 关闭:No 输出电流:55 mA 最大工作温度:+ 125 C 封装:Reel |
| TC7652 | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:Low Noise, Chopper Stabilized Operational Amplifier |
| TC7652_13 | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:Low Noise, Chopper Stabilized Operational Amplifier |
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