CA3420

0.5MHz, Low Supply Voltage, Low Input Current BiMOS Operational Amplifiers

Product Status: Mass Production

OVERVIEW

The CA3420 is an integrated circuit operational amplifier that combines PMOS transistors and bipolar transistors on a single monolithic chip. The CA3420 BiMOS operational amplifier features gate protected PMOS transistors in the input circuit to provide very high input impedance, very low input currents (less than 1pA). The internal bootstrapping network features a unique guardbanding technique for reducing the doubling of leakage current for every 10oC increase in temperature. The CA3420 operates at total supply voltages from 2V to 20V either single or dual supply. This operational amplifier is internally phase compensated to achieve stable operation in the unity gain follower configuration. Additionally, it has access terminals for a supplementary external capacitor if additional frequency rolloff is desired. Terminals are also provided for use in applications requiring input offset voltage nulling. The use of PMOS in the input stage results in common mode input voltage capability down to 0.45V below the negative supply terminal, an important attribute for single supply application. The output stage uses a feedback OTA type amplifier that can swing essentially from rail-to-rail. The output driving current of 1.5mA (Min) is provided by using nonlinear current mirrors.

KEY FEATURES

  • 2V Supply at 300µA Supply Current
  • 1pA Input Current (Typ) (Essentially Constant to 85°C)
  • Rail-to-Rail Output Swing (Drive ±2mA into 1kΩ Load)
  • Pin Compatible with 741 Operational Amplifiers
  • Pb-Free Plus Anneal Available (RoHS Compliant)

BLOCK DIAGRAM

 Block Diagram

PARAMETRICS

Parameters
CA3420
Basic Information
生产状态
Mass Production
器件/通道数量
1
带宽 (MHz)
0.5
压摆率 (V/μs)
0.5
VS (最小值)
2 V
VS (最大值)
20 V
IS (每放大器)
0.45 mA
噪声VN (nV/√Hz)
38
IBIAS
5 pA
IBIAS (最大值)
5 pA
最大失调电压
5 mV
IOUT
1.5 mA
VOUT (V)
19.75
轨到轨输入
No
轨到轨输出
Yes
PSRR (dB)
80
CMRR (dB)
65
热关断
No
增益最小值
1
AVOL (dB)
100
启用
Strobe
资质级别
Standard
CAN 采样
YES
温度范围
-55 to +125

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