Description
The AXOP32121 (single), AXOP32122 (dual) and AXOP32124 (quad) are ultra-low noise, ultra-low offset
dual, quad and single mid voltage (3V to 24V) operational amplifiers (opamps) with rail-to-rail output
swing capabilities. These devices are very suitable for applications where ultra-low noise, high voltage
operation and a small footprint.
Features
▪ Supply voltages from 3V to 24V
▪ Ultra-low input voltage noise (20Hz to 20kHz) G=+1, 0.45μV
▪ Excellent THD 114dB
▪ Excellent SNR 120dB
▪ Output rail-to-rail
▪ Low input offset voltage: ±0.1mV typ
▪ Unity-gain bandwidth: 30MHz
▪ Low quiescent current (per opamp): 1.2mA typ @14V, 0.5mA typ @3.3V
Applications
▪ Infotainment system
▪ HVAC: heating, ventilating, and air conditioning
▪ Industrial control
▪ Test equipment
▪ Portable Equipment
▪ Active filters
▪ Data acquisition system
1 Block Diagram and Application Circuit
2 Pin Description
2.1 AXOP32122A/B/C/D/E Pinouts
2.2 AXOP32122F Pinout
2.3 AXOP32124A/B/C Pinouts
2.4 AXOP32121A Pinout
2.5 AXOP32121C Pinout
3 Electrical Specifications
3.1 Absolute Maximum Ratings
3.2 Thermal Data
3.3 ESD
3.4 Electrical Characteristics
4 Functional Description
4.1 Overview
The AXOP3212x devices are a family of mid voltage, rail-to-rail output opamps. These devices
operate from 3V to 24V, 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 Output
The input common mode voltage range of the AXOP3212x family extends from 1V to Vs for the
full supply voltage range of 3V to 24V. This performance is achieved with a NPN input
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 25mV
(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.