Overview
The ADA4625-1ARDZ, produced by Analog Devices Inc., is a high-performance operational amplifier (op-amp) designed for applications requiring high voltage, high gain, and low noise. This device builds upon Analog Devices' industry-leading single-supply, rail-to-rail output (RRO), precision junction field effect transistor (JFET) input op-amps, offering unprecedented speed and low noise levels. The ADA4625-1ARDZ is particularly suited for phase-locked loop (PLL) filter amplifiers, transimpedance amplifiers, photodiode sensor interfaces, and low noise charge amplifiers.
Key Specifications
| Parameter | Symbol | Test Conditions/Comments | Min | Typ | Max | Unit |
|---|---|---|---|---|---|---|
| Input Bias Current | Ib | TA = 25°C | ±15 pA | pA | ||
| Offset Voltage | Vos | TA = 25°C | ±80 µV | µV | ||
| Offset Voltage Drift | Vos Drift | TA = −40°C to 85°C | ±1.2 µV/°C | µV/°C | ||
| Supply Voltage Range | V+ | Single-supply operation | 5 V | 36 V | V | |
| Supply Voltage Range | V± | Dual-supply operation | ±2.5 V | ±18 V | V | |
| Slew Rate | SR | VOUT = ±10 V, RL = 2 kΩ, AV = −1 | 48 V/µs | V/µs | ||
| Gain Bandwidth Product | GBP | AV = 100 | 18 MHz | MHz | ||
| Unity-Gain Crossover Frequency | UGC | AV = 1 | 12.4 MHz | MHz | ||
| Phase Margin | ΦM | 88 Degrees | Degrees | |||
| Settling Time | tS | To 0.01%, VIN = 10 V step, RL = 2 kΩ, CL = 15 pF, AV = −1 | 700 ns | ns |
Key Features
- Low Input Bias Current: ±15 pA typical at TA = 25°C, ensuring minimal input signal distortion.
- Low Offset Voltage: ±80 µV maximum at TA = 25°C, and low offset voltage drift of ±1.2 µV/°C.
- Fast Settling Time: 0.01% in 700 ns typical, making it suitable for high-speed applications.
- Wide Operating Voltage Range: Dual-supply operation from ±2.5 V to ±18 V and single-supply operation from 5 V to 36 V.
- Rail-to-Rail Output: Output voltage swings rail to rail, maximizing dynamic range in low voltage applications.
- High Capacitive Load Drive Capability: Can drive high capacitive loads without oscillation.
- No Phase Reversal: Ensures stable operation without phase inversion.
- Unity-Gain Stable: Stable in unity-gain configuration, making it versatile for various applications.
Applications
- PLL Filter Amplifiers: Ideal for phase-locked loop applications due to its high gain and low noise characteristics.
- Transimpedance Amplifiers: Suitable for converting current signals to voltage signals with high accuracy.
- Photodiode Sensor Interfaces: Used in photodiode sensor circuits to amplify low-level signals.
- Low Noise Charge Amplifiers: Applied in charge amplification where low noise and high gain are critical.
- Voltage Controlled Oscillators (VCOs): Used in VCOs and preamplifiers requiring high tuning voltage and wide bandwidth.
Q & A
- What is the typical input bias current of the ADA4625-1ARDZ?
The typical input bias current is ±15 pA at TA = 25°C.
- What is the maximum offset voltage of the ADA4625-1ARDZ?
The maximum offset voltage is ±80 µV at TA = 25°C.
- What is the operating voltage range for the ADA4625-1ARDZ?
The device can operate from a single supply of 5 V to 36 V or dual supplies from ±2.5 V to ±18 V.
- Does the ADA4625-1ARDZ have rail-to-rail output capability?
Yes, the output voltage swings rail to rail, maximizing dynamic range in low voltage applications.
- What is the slew rate of the ADA4625-1ARDZ?
The slew rate is 48 V/µs typical for VOUT = ±10 V, RL = 2 kΩ, and AV = −1.
- Is the ADA4625-1ARDZ unity-gain stable?
Yes, the device is stable in unity-gain configuration.
- What is the gain bandwidth product of the ADA4625-1ARDZ?
The gain bandwidth product is 18 MHz for AV = 100.
- What are some common applications of the ADA4625-1ARDZ?
Common applications include PLL filter amplifiers, transimpedance amplifiers, photodiode sensor interfaces, and low noise charge amplifiers.
- What is the phase margin of the ADA4625-1ARDZ?
The phase margin is 88 degrees.
- How long does it take for the ADA4625-1ARDZ to settle to 0.01%?
The settling time to 0.01% is 700 ns typical for VIN = 10 V step, RL = 2 kΩ, and CL = 15 pF.
