Overview
The ADA4940-1ARZ-RL, produced by Analog Devices Inc., is a low noise, low distortion fully differential amplifier designed for high-performance applications. It is particularly suited for driving low power, high resolution analog-to-digital converters (ADCs) with resolutions up to 16 bits from dc to 1 MHz. The amplifier operates on a very low quiescent current of 1.25 mA, making it ideal for power-sensitive designs. Fabricated using Analog Devices' SiGe complementary bipolar process, the ADA4940-1ARZ-RL achieves very low levels of distortion and high dynamic performance, making it a versatile choice for various data acquisition and signal processing tasks.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Operating Voltage Range | 3 | - | 7 | V |
| Quiescent Current per Amplifier (Enabled) | 1.05 | 1.25 | 1.38 | mA |
| Quiescent Current Drift (TMIN to TMAX) | - | - | 4.25 | µA/°C |
| Input Bias Current | -1.6 | -1.1 | - | µA |
| Input Offset Current | -500 | ±50 | 500 | nA |
| Input Common-Mode Voltage Range | -VS - 0.2 | - | +VS - 1.2 | V |
| Differential Input Resistance | - | - | 33 kΩ | - |
| Common-Mode Input Resistance | - | - | 50 MΩ | - |
| Input Capacitance | - | - | 1 pF | - |
| Common-Mode Rejection Ratio (CMRR) | 86 | - | 119 | dB |
| Open-Loop Gain | 91 | - | 99 | dB |
| Output Voltage Swing (Single-Ended) | -VS + 0.1 | - | +VS - 0.1 | V |
| Linear Output Current (f = 1 MHz, RL = 22 Ω) | - | - | 46 mA peak | - |
| Output Balance Error (f = 1 MHz) | -65 | - | -60 | dB |
| Operating Temperature Range | -40 | - | 125 | °C |
Key Features
- Low Noise and Distortion: The ADA4940-1ARZ-RL features very low noise and distortion, making it suitable for high-resolution ADC applications.
- Low Power Consumption: Operates on a quiescent current of only 1.25 mA, ideal for power-sensitive designs.
- Adjustable Output Common-Mode Voltage: Allows matching the input common-mode voltage of multiple ADCs.
- Internal Common-Mode Feedback Loop: Provides exceptional output balance and suppression of even-order harmonic distortion products.
- Flexible Power Supplies: Can operate from 3 V to 7 V, making it versatile for various power supply configurations.
- Disable Pin: Reduces power consumption when the amplifier is not in use.
- Rail-to-Rail Output: Output voltage swing from -VS + 0.1 V to +VS - 0.1 V.
- High Dynamic Performance: Suitable for driving high-performance SAR and Σ-Δ ADCs up to 16 bits from dc to 1 MHz.
Applications
- Low Power ADC Drivers: Ideal for driving low power, high resolution SAR and Σ-Δ analog-to-digital converters.
- Single-Ended-to-Differential Conversion: Converts single-ended signals to differential signals for improved noise immunity.
- Differential Buffers and Line Drivers: Used in applications requiring high fidelity signal transmission.
- Medical Imaging: Suitable for medical imaging equipment due to its low noise and high dynamic performance.
- Industrial Process Controls: Used in industrial control systems where high accuracy and low noise are critical.
- Portable Electronics: Ideal for battery-powered devices due to its low power consumption.
Q & A
- Q: What is the typical quiescent current of the ADA4940-1ARZ-RL?
A: The typical quiescent current is 1.25 mA per amplifier when enabled.
- Q: What is the operating voltage range of the ADA4940-1ARZ-RL?
A: The operating voltage range is from 3 V to 7 V.
- Q: What is the input common-mode voltage range of the ADA4940-1ARZ-RL?
A: The input common-mode voltage range is from -VS - 0.2 V to +VS - 1.2 V.
- Q: How does the ADA4940-1ARZ-RL handle common-mode rejection?
A: It features a high common-mode rejection ratio (CMRR) of up to 119 dB.
- Q: What is the output voltage swing of the ADA4940-1ARZ-RL?
A: The output voltage swing is from -VS + 0.1 V to +VS - 0.1 V.
- Q: Can the ADA4940-1ARZ-RL be used in medical imaging applications?
A: Yes, it is suitable for medical imaging due to its low noise and high dynamic performance.
- Q: How does the disable pin function on the ADA4940-1ARZ-RL?
A: The disable pin reduces power consumption when the amplifier is not in use.
- Q: What is the typical input bias current of the ADA4940-1ARZ-RL?
A: The typical input bias current is -1.1 µA.
- Q: What is the operating temperature range of the ADA4940-1ARZ-RL?
A: The operating temperature range is from -40°C to +125°C.
- Q: Is the ADA4940-1ARZ-RL RoHS compliant?
A: Yes, the ADA4940-1ARZ-RL is lead-free and RoHS compliant.
