Description
The AXOP32122 (dual), and AXOP32124 (quad) are ultra-low noise dual and quad mid voltage (3V to
14V) operational amplifiers (opamps) with rail-to-rail input and output swing capabilities. These devices
are very suitable for applications where ultra-low noise, high voltage operation and a small footprint.
AXOP32122S and AXOP32124S are with Shutdown function.
Features
Supply voltages from 3V to 14V
Ultra-low input voltage noise (20Hz to 20kHz) 0.4μV
Excellent THD+N 96dB
Excellent SNR 120dB
Rail-to-rail input and output
Low input offset voltage: ±0.1mV typ
Unity-gain bandwidth: 25MHz
Low quiescent current (per opamp): 1.2mA typ @14V
Shutdown function (AXOP32122S and AXOP32124S)
Applications
Infotainment system
HVAC: heating, ventilating, and air conditioning
Industrial control
Test equipment
Portable Equipment
Active filters
Data acquisition system
Table 1 Device Summary
1 Block Diagram and Application Circuit
2 Pin Description
2.1 AXOP32122A/B/C/D/E Pinouts
2.2 AXOP32122SA/B Pinouts
2.3 AXOP32124A/B/C Pinouts
AXOP32124A AXOP32124B AXOP32124C
2.4 AXOP32124SA/B Pinouts
3 Electrical Specifications
4 Functional Description
4.1 Overview
The AXOP3212x devices are a family of high voltage, rail-to-rail input and output opamps.
These devices operate from 3V to 14V, are unity gain stable, and are designed for a wide
range of applications and used in virtually any single supply application.
4.2 Rail to Rail Input and Output
The input common mode voltage range of the AXOP3212x family extends 100mV beyond the
supply rails for the full supply voltage range of 3V to 14V. This performance is achieved with a
complementary input stage: a NPN input differential pair in parallel with a PNP differential pair,
as shown in Figure 1.
Designed as a high voltage operational amplifier, the AXOP3212x series delivers a robust
output drive capability. A class AB output stage with common source Mosfets achieves full
rail-to-rail output swing capability. For resistive loads of 10kΩ, the output swings to within
60mV (typ) of either supply rail, regardless of the applied power supply voltage. Different load
conditions change the ability of the amplifier to swing close to the rails.
4.3 Overload Recovery
Overload recovery is defined as the time required for the opamp output to recover from a
saturated state to a linear state. The output devices of the opamp enter a saturation region
when the output voltage exceeds the rated operating voltage, because of the high input
voltage or the high gain. After the device enters the saturation region, the charge carriers in
the output devices require time to return to the linear state. After the charge carriers return to
the linear state, the device begins to slew at the specified slew rate. The overload recovery
time for the AXOP3212x family is approximately 20ns.
4.4 EMI Rejection
The AXOP3212x uses integrated electromagnetic interference (EMI) filtering to reduce the
effects of EMI from sources such as wireless communications and densely populated boards
with a mix of analog signal chain and digital components.
4.5 Shutdown
The AXOP3212xS has shutdown function. The amplifiers can be shut down by enabling the
respective shutdown pin