Overview
The ADA4940-1ARZ-R7 is a low noise, low distortion fully differential amplifier produced by Analog Devices Inc. It is designed for very low power consumption, making it an ideal choice for driving low power, high resolution, and high performance SAR (Successive Approximation Register) and Σ-Δ (Sigma-Delta) analog-to-digital converters (ADCs) with resolutions up to 16 bits from dc to 1 MHz. The amplifier operates on a quiescent current of only 1.25 mA, ensuring high efficiency in power-sensitive applications.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Supply Voltage | 3 | 7 | V | |
| Quiescent Current per Amplifier | 1.05 | 1.25 | 1.38 | mA |
| Input Bias Current | -1.6 | -1.1 | µA | |
| Input Offset Voltage | 350 | µV | ||
| Gain Bandwidth Product (GBP) | 260 | MHz | ||
| Slew Rate (SR) | 95 | V/µs | ||
| Common-Mode Rejection Ratio (CMRR) | 86 | 119 | dB | |
| Operating Temperature Range | -40 | 125 | °C | |
| Output Current per Channel | 46 | mA | ||
| Settling Time to 0.1% | 34 | ns |
Key Features
- Low noise and low distortion, making it suitable for high-resolution ADC drivers.
- Very low power consumption with a quiescent current of 1.25 mA per amplifier.
- Adjustable output common-mode voltage to match the input common-mode voltage of multiple ADCs.
- Internal common-mode feedback loop for exceptional output balance and suppression of even-order harmonic distortion.
- Rail-to-rail output: −VS + 0.1 V to +VS − 0.1 V.
- Flexible power supplies: 3 V to 7 V (LFCSP package).
- Disable pin to reduce power consumption.
- High gain bandwidth product (GBP) of 260 MHz and slew rate of 95 V/µs.
- Low input voltage noise of 3.9 nV/√Hz.
- Available in LFCSP and SOIC packages.
Applications
- Low power PulSAR/SAR ADC drivers.
- Single-ended-to-differential conversion.
- Differential buffers and line drivers.
- Medical imaging.
- Industrial process controls.
- Portable electronics.
- Data acquisition and signal processing applications.
Q & A
- What is the primary application of the ADA4940-1ARZ-R7?
The ADA4940-1ARZ-R7 is primarily used for driving low power, high resolution SAR and Σ-Δ analog-to-digital converters (ADCs).
- What is the quiescent current of the ADA4940-1ARZ-R7?
The quiescent current is 1.25 mA per amplifier.
- What is the supply voltage range for the ADA4940-1ARZ-R7?
The supply voltage range is from 3 V to 7 V.
- What are the available packages for the ADA4940-1ARZ-R7?
The ADA4940-1ARZ-R7 is available in LFCSP and SOIC packages.
- What is the gain bandwidth product (GBP) of the ADA4940-1ARZ-R7?
The GBP is 260 MHz.
- What is the slew rate of the ADA4940-1ARZ-R7?
The slew rate is 95 V/µs.
- What is the common-mode rejection ratio (CMRR) of the ADA4940-1ARZ-R7?
The CMRR is 86 dB to 119 dB.
- What is the operating temperature range of the ADA4940-1ARZ-R7?
The operating temperature range is from -40°C to 125°C.
- Does the ADA4940-1ARZ-R7 have a disable feature?
Yes, it has a disable pin to reduce power consumption.
- What is the input voltage noise of the ADA4940-1ARZ-R7?
The input voltage noise is 3.9 nV/√Hz.
