Overview
The ADA4622-4 is a next-generation precision operational amplifier from Analog Devices Inc., building upon the legacy of the AD824. It is a single-supply, rail-to-rail output (RRO), precision junction field effect transistor (JFET) input op-amp. The ADA4622-4 is designed for operation over an extended industrial temperature range of −40°C to +125°C and can operate from 5 V to 30 V, with specifications at +5 V, ±5 V, and ±15 V. It is available in 14-lead SOIC_N and 16-lead, 4 × 4 mm LFCSP packages.
Key Specifications
| Specification | Description |
|---|---|
| Number of Pins | 14 |
| Package Type | 14-lead SOIC_N, 16-lead LFCSP |
| Operating Temperature Range | −40°C to +125°C |
| Supply Voltage Range | 5 V to 30 V |
| Gain Bandwidth Product | 8 MHz typical |
| Slew Rate | 23 V/µs typical (low to high), −18 V/µs typical (high to low) |
| Input Bias Current | ±10 pA maximum at T_A = 25°C |
| Offset Voltage | A grade: ±0.8 mV maximum at T_A = 25°C, B grade: ±0.35 mV maximum at T_A = 25°C |
| Offset Voltage Drift | A grade: ±2 µV/°C typical, ±15 µV/°C maximum, B grade: ±2 µV/°C typical, ±5 µV/°C maximum |
| Input Voltage Range | Includes the negative supply |
| Output Type | Rail-to-rail output |
| EMIRR | 90 dB typical at f = 1000 MHz and f = 2400 MHz |
| Common-Mode Rejection Ratio (CMRR) | 81 dB at (−40°C < T_A < +125°C) |
| Voltage Noise | 0.75 µV p-p at 0.1 Hz to 10 Hz |
| Crosstalk | −112 dB at (f = 1 kHz) |
Key Features
- Next generation of the AD824 with improved specifications and performance.
- Wide gain bandwidth product: 8 MHz typical.
- High slew rate: 23 V/µs typical (low to high), −18 V/µs typical (high to low).
- Low input bias current: ±10 pA maximum at T_A = 25°C.
- Low offset voltage and drift: A grade: ±0.8 mV maximum, B grade: ±0.35 mV maximum at T_A = 25°C.
- Input voltage range includes the negative supply, and rail-to-rail output.
- Electromagnetic interference rejection ratio (EMIRR): 90 dB typical at f = 1000 MHz and f = 2400 MHz.
- Industry-standard package and pinouts.
- Improved DC precision with reduced voltage noise.
Applications
- High output impedance sensor interfaces.
- Photodiode sensor interfaces.
- Transimpedance amplifiers.
- ADC drivers.
- Precision filters and signal conditioning.
Q & A
- What is the ADA4622-4?
The ADA4622-4 is a single-supply, rail-to-rail output (RRO), precision junction field effect transistor (JFET) input operational amplifier from Analog Devices Inc.
- What are the key improvements over the AD824?
The ADA4622-4 offers improved DC precision, reduced voltage noise, higher gain bandwidth product, and better electromagnetic interference rejection ratio (EMIRR) compared to the AD824.
- What is the operating temperature range of the ADA4622-4?
The ADA4622-4 operates over an extended industrial temperature range of −40°C to +125°C.
- What are the typical slew rates of the ADA4622-4?
The typical slew rates are 23 V/µs (low to high) and −18 V/µs (high to low).
- What is the input bias current of the ADA4622-4?
The input bias current is ±10 pA maximum at T_A = 25°C.
- Can the ADA4622-4 be used as a photodiode preamplifier?
Yes, the ADA4622-4 is an excellent choice for photodiode preamplifier applications due to its low input bias current, high gain bandwidth product, and low input capacitance.
- What are the common applications of the ADA4622-4?
Common applications include high output impedance sensor interfaces, photodiode sensor interfaces, transimpedance amplifiers, ADC drivers, and precision filters and signal conditioning.
- What is the EMIRR of the ADA4622-4?
The electromagnetic interference rejection ratio (EMIRR) is 90 dB typical at f = 1000 MHz and f = 2400 MHz.
- What are the package options for the ADA4622-4?
The ADA4622-4 is available in 14-lead SOIC_N and 16-lead, 4 × 4 mm LFCSP packages.
- How does the ADA4622-4 handle overvoltage conditions?
The ADA4622-4 has internal protective circuitry that allows voltages as high as 0.3 V beyond the supplies applied at the input without causing damage. However, a current-limiting resistor is recommended if the input voltage exceeds 0.3 V beyond the supply rails for extended periods.
