参数资料
| 型号： | TC7650CPD |
| 厂商： | Microchip Technology |
| 文件页数： | 12/14页 |
| 文件大小： | 0K |
| 描述： | IC OPAMP CHOPPER STAB 14DIP |
| 标准包装： | 30 |
| 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： | 14-DIP（0.300"，7.62mm） |
| 供应商设备封装： | 14-PDIP |
| 包装： | 管件 |
| 产品目录页面： | 680 (CN2011-ZH PDF) |
2002 Microchip Technology Inc.
DS21463B-page 7
TC7650
3.9
Pin Compatibility
On the 8-pin mini-DIP TC7650, the external null stor-
age 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 capaci-
tor connections.
For OP05 and OP07 operational amplifiers, the
replacement of the offset null potentiometer between
pins 1 and 8 by two capacitors from the pins to VSS 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.
Other operational amplifiers may use this pin as an off-
set or compensation point.
The minor modifications needed to retrofit a TC7650
into existing sockets operating at reduced power sup-
ply voltages make prototyping and circuit verification
straightforward.
3.10
Input Guarding
High impedance, low leakage CMOS inputs allow the
TC7650 to make measurements of high-impedance
sources. Stray leakage paths can increase input cur-
rents and decrease input resistance unless inputs are
guarded. A guard is a conductive PC trace surrounding
the input terminals. The ring connects to a low imped-
ance 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 connections are shown
in Figure 3-6.
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 sol-
dering. Protective coatings will prevent future board
contamination.
3.11
Component Selection
The two required capacitors, CA and CB, have optimum
values, depending on the clock or chopping frequency.
For the preset internal clock, the correct value is 0.1
F.
To maintain the same relationship between the chop-
ping frequency 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 preferred; ceramic or other lower
grade capacitors may be suitable in some applications.
For fast settling on initial turn-on, low dielectric absorp-
tion capacitors (such as polypropylene) should be
used. With ceramic capacitors, several seconds may
be required to settle to 1
V.
FIGURE 3-6:
INPUT GUARD CONNECTION
Input
+
Output
R2
Inverting Amplifier
Input
+
Output
Follower
Input
+
Output
R2
R1
Noninverting Amplifier
R3*
Should Be Low
Impedence For
Optimum Guarding
NOTE: R3 =
R1 R2
R1 + R2
R3*
R1
-
相关PDF资料 |
PDF描述 |
|---|---|
| TC7652CPD | IC OPAMP CHOPPER STAB LN 14DIP |
| TC913ACPA | IC OPAMP DUAL AUTO ZERO 8DIP |
| TCA0372DWG | IC OPAMP DUAL POWER 1A 16SOIC |
| TDA1348AE | 48V FAN 127X127X38MM |
| TDA1548AG | 48V FAN 172X150X50.8MM |
相关代理商/技术参数 |
参数描述 |
|---|---|
| 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 |
| TC7652CPA | 功能描述:运算放大器 - 运放 Low Noise Op Amp 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 |
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