Overview
The ADA4922-1ACPZ-RL7, manufactured by Analog Devices Inc., is a high-voltage, differential driver designed for 16-bit to 18-bit analog-to-digital converters (ADCs) with differential input ranges up to ±20 V. This amplifier is configured as a single-ended-to-differential converter, requiring no external components to drive ADCs. It is built on Analog Devices' proprietary, second-generation XFCB process, which enables excellent noise and distortion performance, especially at high supply voltages. The ADA4922-1 offers low distortion and high signal-to-noise ratio (SNR), making it suitable for a variety of applications, including industrial instrumentation and medical instruments.
Key Specifications
| Parameter | Test Conditions/Comments | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| DYNAMIC PERFORMANCE - 3 dB Bandwidth | G = +2, VO = 0.2 V p-p, differential | 34 | 38 | - | MHz |
| DYNAMIC PERFORMANCE - 3 dB Bandwidth | G = +2, VO = 40 V p-p, differential | 6.5 | 7.2 | - | MHz |
| Overdrive Recovery Time | +Recovery/−Recovery | 180/330 | - | - | ns |
| Slew Rate | VO, dm = 2 V step | - | 260 | - | V/µs |
| Input Resistance | - | - | 11 | - | MΩ |
| Input Capacitance | - | - | 1 | - | pF |
| Input Voltage Range | - | - | ±10.7 | - | V |
| Output Voltage Swing | Each single-ended output, RL = 1 kΩ | ±10.65 | ±10.7 | - | V |
| DC Output Current | - | - | 40 | - | mA |
| Power Supply Operating Range | - | 5 | 26 | - | V |
| Quiescent Current | - | 9.4 | 10.1 | - | mA |
| Quiescent Current (Disabled) | - | 1.5 | 2.0 | - | mA |
| Power Supply Rejection Ratio (PSRR) | -PSRR | -89 | -80 | - | dB |
| Power Supply Rejection Ratio (PSRR) | +PSRR | -91 | -83 | - | dB |
Key Features
- Single-Ended to Differential Conversion: The ADA4922-1 operates as a single-ended-to-differential amplifier, eliminating the need for external components to drive ADCs.
- High Voltage Capability: It supports differential input ranges up to ±20 V, making it suitable for high-voltage applications.
- Low Distortion and High SNR: The amplifier provides low distortion and high signal-to-noise ratio, essential for driving ADCs with resolutions up to 18 bits.
- Wide Supply Voltage Range: The device operates over a wide supply voltage range of 5 V to 26 V.
- High Input Impedance: It features high input impedance, which is beneficial for various applications.
- Fixed Differential Gain: The ADA4922-1 has a fixed differential gain of 2.
- Industrial Temperature Range: The device is rated to work over the extended industrial temperature range of −40°C to +85°C.
- Package Options: Available in 8-lead LFCSP and 8-lead SOIC packages, both with an exposed paddle for efficient heat transfer.
Applications
- Industrial Instrumentation: Suitable for driving ADCs in industrial instrumentation applications due to its high voltage capability and low distortion.
- Medical Instruments: Used in medical instruments where high precision and low noise are critical.
- Spectrum Analysis and ATE (Automated Test Equipment): The ADA4922-1 is also applicable in spectrum analysis and ATE due to its high performance characteristics.
Q & A
- What is the primary function of the ADA4922-1?
The ADA4922-1 is a differential driver for 16-bit to 18-bit analog-to-digital converters (ADCs), converting single-ended signals to differential signals.
- What is the input voltage range of the ADA4922-1?
The input voltage range of the ADA4922-1 is up to ±10.7 V.
- What is the supply voltage range for the ADA4922-1?
The supply voltage range for the ADA4922-1 is from 5 V to 26 V.
- What are the key benefits of using the ADA4922-1?
The key benefits include low distortion, high SNR, and a wide supply voltage range, making it suitable for high-resolution ADC applications.
- In what temperature range does the ADA4922-1 operate?
The ADA4922-1 operates over the extended industrial temperature range of −40°C to +85°C.
- What are the available package options for the ADA4922-1?
The ADA4922-1 is available in 8-lead LFCSP and 8-lead SOIC packages, both with an exposed paddle for efficient heat transfer.
- How does the ADA4922-1 handle capacitive loads?
The ADA4922-1 can drive capacitive loads with up to 20 pF and 30% overshoot.
- What is the quiescent current of the ADA4922-1 when enabled and disabled?
The quiescent current is approximately 9.4 mA to 10.1 mA when enabled and 1.5 mA to 2.0 mA when disabled.
- What is the power supply rejection ratio (PSRR) of the ADA4922-1?
The PSRR is −89 dB to −80 dB for negative supply and −91 dB to −83 dB for positive supply.
- How long does it take for the ADA4922-1 to turn on and turn off?
The turn-on time is approximately 78 ns, and the turn-off time is about 160 µs.
