Overview
The AD7779ACPZ-RL, produced by Analog Devices Inc., is an 8-channel, 24-bit, simultaneous sampling analog-to-digital converter (ADC). This device features eight full Σ-Δ ADCs on a single chip, each with a programmable gain stage allowing gains of 1, 2, 4, and 8. This allows for the mapping of lower amplitude sensor outputs into the full-scale ADC input range, thereby maximizing the dynamic range of the signal chain. The AD7779 accepts reference voltages (VREF) from 1 V to 3.6 V and supports both unipolar and true bipolar analog input signals with supply voltages of 3.3 V or ±1.65 V. The device is highly versatile, supporting true differential, pseudo differential, or single-ended signal configurations to match various sensor output types.
Key Specifications
| Specification | Value |
|---|---|
| Number of Channels | 8 |
| Resolution | 24-bit |
| Sampling Rate | 16 kSPS |
| Input Type | Unipolar (0 V to VREF/GAIN), True Bipolar (±VREF/GAIN/2 V) |
| Analog Supply Voltage | 3.3 V or ±1.65 V |
| Reference Voltage (VREF) | 1 V to 3.6 V |
| Programmable Gain | 1, 2, 4, 8 |
| Power Modes | High Resolution Mode (10.75 mW per channel), Low Power Mode (3.37 mW per channel) |
| Operating Temperature Range | −40°C to +105°C (operational up to +125°C) |
| Package Type | 64-Lead LFCSP (9mm x 9mm w/ EP) |
Key Features
- Simultaneous sampling of all 8 channels
- Programmable gain stages for each channel
- Support for true differential, pseudo differential, or single-ended input signals
- Low latency digital filter (sinc3) and ADC modulator in each channel
- System Reference Clock (SRC) for fine resolution control over the Output Data Rate (ODR)
- Dedicated SPI control interface and data output interface
- Internal 12-bit SAR ADC for diagnostics and validation without decommissioning Σ-Δ ADC channels
- Internal multiplexer for sensing internal nodes and external multiplexer control via GPIOs
- Internal 2.5 V reference and reference buffer with a typical temperature coefficient of 10 ppm/°C
Applications
The AD7779ACPZ-RL is suitable for a variety of applications requiring high precision and simultaneous sampling, such as industrial process control, medical devices, test and measurement equipment, and functional safety systems. Its ability to handle different input signal types and its low power consumption make it an ideal choice for battery-powered devices and systems where power efficiency is crucial.
Q & A
- What is the resolution and sampling rate of the AD7779ACPZ-RL?
The AD7779ACPZ-RL has a resolution of 24 bits and a sampling rate of 16 kSPS. - How many channels does the AD7779ACPZ-RL have?
The AD7779ACPZ-RL has 8 channels. - What are the supported input signal types for the AD7779ACPZ-RL?
The device supports unipolar (0 V to VREF/GAIN) and true bipolar (±VREF/GAIN/2 V) analog input signals. - What are the power consumption modes of the AD7779ACPZ-RL?
The device operates in two modes: High Resolution Mode (10.75 mW per channel) and Low Power Mode (3.37 mW per channel). - What is the operating temperature range of the AD7779ACPZ-RL?
The operating temperature range is −40°C to +105°C, although the device is operational up to +125°C. - What package type does the AD7779ACPZ-RL come in?
The device comes in a 64-Lead LFCSP (9mm x 9mm w/ EP) package. - Does the AD7779ACPZ-RL support external multiplexing?
Yes, the device supports external multiplexing through its GPIO pins. - What is the purpose of the internal 12-bit SAR ADC in the AD7779ACPZ-RL?
The internal 12-bit SAR ADC is used for diagnostics and validation without decommissioning one of the Σ-Δ ADC channels dedicated to system measurement functions. - How can the Output Data Rate (ODR) be controlled in the AD7779ACPZ-RL?
The ODR can be controlled using the System Reference Clock (SRC) which is programmable through the SPI interface. - What is the typical temperature coefficient of the internal reference in the AD7779ACPZ-RL?
The internal reference has a typical temperature coefficient of 10 ppm/°C.
