Overview
The ADA4940-1ACPZ-R7 is a low noise, low distortion differential amplifier manufactured by Analog Devices Inc. This device is part of the ADA4940 series, which is renowned for its high performance and low power consumption. The ADA4940-1 is particularly suited for driving high-resolution analog-to-digital converters (ADCs) and is ideal for various data acquisition and signal processing applications. The amplifier features a simple external feedback network that allows for easy configuration of differential gain settings.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Input Voltage Noise | 3.9 | nV/√Hz | ||
| 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 | |
| Input Resistance (Differential) | 33 | kΩ | ||
| Input Capacitance | 1 | pF | ||
| Common-Mode Rejection Ratio (CMRR) | 86 | 114 | dB | |
| Open-Loop Gain | 91 | 99 | dB | |
| Output Voltage Swing (Each Single-Ended Output) | -VS + 0.08 | +VS - 0.08 | V | |
| Linear Output Current | 38 | mA (peak) | ||
| Power Supply Operating Range | 3 | 7 | V | |
| Quiescent Current per Amplifier Enabled | 1.05 | 1.25 | 1.38 | mA |
| Operating Temperature Range | -40 | +125 | °C | |
| Package Type | 16-Lead LFCSP (3mm x 3mm w/ EP) |
Key Features
- Low noise and low distortion, making it ideal for high-resolution ADCs and precision signal processing.
- Very low power consumption with a quiescent current of 1.05 mA to 1.38 mA per amplifier.
- High bandwidth of 260 MHz (-3dB) and excellent dynamic performance.
- Simple external feedback network for easy gain configuration.
- High common-mode rejection ratio (CMRR) of up to 114 dB.
- Operating temperature range from -40°C to +125°C.
- Pb-free, 16-lead LFCSP package with optimized pinout for minimal distortion and ease of PCB layout.
Applications
- Data acquisition systems requiring high precision and low noise.
- Driving high-resolution SAR and Σ-Δ analog-to-digital converters (ADCs) up to 16 bits.
- Signal processing applications where low distortion and high dynamic range are critical.
- Medical and industrial instrumentation where precision and reliability are essential.
- Aerospace and defense applications due to its robust performance over a wide temperature range.
Q & A
- What is the input voltage noise of the ADA4940-1?
The input voltage noise of the ADA4940-1 is 3.9 nV/√Hz.
- What is the typical quiescent current of the ADA4940-1?
The typical quiescent current of the ADA4940-1 is 1.25 mA per amplifier.
- What is the operating temperature range of the ADA4940-1?
The operating temperature range of the ADA4940-1 is from -40°C to +125°C.
- What is the package type of the ADA4940-1ACPZ-R7?
The package type of the ADA4940-1ACPZ-R7 is a 16-Lead LFCSP (3mm x 3mm w/ EP).
- What is the bandwidth of the ADA4940-1?
The bandwidth of the ADA4940-1 is 260 MHz (-3dB).
- What are the typical applications of the ADA4940-1?
The ADA4940-1 is typically used in data acquisition systems, driving high-resolution ADCs, and in various signal processing applications where low noise and distortion are critical.
- How is the gain of the ADA4940-1 configured?
The gain of the ADA4940-1 is configured using a simple external feedback network of four resistors.
- What is the common-mode rejection ratio (CMRR) of the ADA4940-1?
The CMRR of the ADA4940-1 is up to 114 dB.
- Is the ADA4940-1 suitable for harsh environments?
Yes, the ADA4940-1 is suitable for harsh environments due to its wide operating temperature range and robust performance.
- How does the disable feature work on the ADA4940-1?
The ADA4940-1 has a disable feature that can be controlled via the DISABLE pin. When the pin is set to a voltage below -VS + 1 V, the amplifier is disabled, and when set to a voltage above -VS + 1.8 V, the amplifier is enabled.
