Overview
The ADA4940-2ACPZ-R2, produced by Analog Devices Inc., is a low noise, low distortion fully differential amplifier designed for driving low power, high resolution analog-to-digital converters (ADCs). These amplifiers are ideal for applications requiring high performance and low power consumption, making them suitable for a variety of data acquisition and signal processing tasks. They operate with very low quiescent current of 1.25 mA and support ADC resolutions up to 18 bits from dc to 1 MHz.
Key Specifications
| Parameter | Value |
|---|---|
| Supply Voltage Range | 3 V to 7 V |
| Quiescent Current | 1.25 mA |
| Input Bias Current | −1.6 to −1.1 µA |
| Input Offset Current | −500 to +500 nA |
| Input Common-Mode Voltage Range | −VS − 0.2 to +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 to 119 dB |
| Open-Loop Gain | 91 to 99 dB |
| Output Voltage Swing | −VS + 0.1 to +VS − 0.1 V |
| Output Balance Error | −65 to −60 dB |
| Settling Time to 0.1% | 34 ns |
| Operating Temperature Range | −40°C to +125°C |
| Package Type | 24-Lead LFCSP (4mm x 4mm w/ EP) |
Key Features
- Low noise and low distortion, making them ideal for high-resolution ADC applications.
- Very low power consumption with a quiescent current of 1.25 mA.
- 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 swing from −VS + 0.1 V to +VS − 0.1 V.
- Disable pin to reduce power consumption.
- Differential gain configurations easily realized with a simple external feedback network.
- Operates over a temperature range of −40°C to +125°C.
Applications
- Driving low power, high resolution SAR and Σ-Δ analog-to-digital converters (ADCs).
- Single-ended-to-differential conversion.
- Differential buffers and line drivers.
- Medical imaging.
- Industrial process controls.
- Portable electronics.
Q & A
- What is the primary application of the ADA4940-2ACPZ-R2? The ADA4940-2ACPZ-R2 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 ADA4940-2ACPZ-R2? The quiescent current is 1.25 mA.
- What is the input common-mode voltage range of the ADA4940-2ACPZ-R2? The input common-mode voltage range is from −VS − 0.2 to +VS − 1.2 V.
- What is the common-mode rejection ratio (CMRR) of the ADA4940-2ACPZ-R2? The CMRR is 86 to 119 dB.
- What is the settling time to 0.1% for the ADA4940-2ACPZ-R2? The settling time to 0.1% is 34 ns.
- What is the operating temperature range of the ADA4940-2ACPZ-R2? The operating temperature range is from −40°C to +125°C.
- What package types are available for the ADA4940-2ACPZ-R2? The ADA4940-2ACPZ-R2 is available in a 24-Lead LFCSP (4mm x 4mm w/ EP) package.
- How does the ADA4940-2ACPZ-R2 achieve exceptional output balance? The ADA4940-2ACPZ-R2 achieves exceptional output balance through its internal common-mode feedback loop.
- Can the output common-mode voltage of the ADA4940-2ACPZ-R2 be adjusted? Yes, the output common-mode voltage can be adjusted to match the input common-mode voltage of multiple ADCs.
- What is the purpose of the disable pin on the ADA4940-2ACPZ-R2? The disable pin is used to reduce power consumption when the amplifier is not in use.
