Overview
The AD7691BRMZ-RL7 is an 18-bit, single-supply, differential analog-to-digital converter (ADC) produced by Analog Devices Inc. This device is part of the PulSAR® family and is known for its high precision, low power consumption, and high-speed conversion capabilities. The AD7691 operates from a single power supply ranging from 2.3 V to 5.25 V and features an internal conversion clock and a versatile SPI-compatible serial interface. It is housed in a 10-lead MSOP package and is specified to operate over a temperature range of −40°C to +85°C, making it suitable for a wide range of applications, including those in harsh environments.
Key Specifications
| Parameter | Value | Conditions/Comments |
|---|---|---|
| Resolution | 18 bits | |
| Conversion Rate | Up to 250 kSPS | |
| Input Range | ±5 V | Voltages on IN+ and IN- pins swing in opposite phases between 0 V and REF |
| Reference Voltage | Externally applied, up to supply voltage | |
| Power Supply | 2.3 V to 5.25 V | VDD |
| Logic Compatibility | 1.8 V, 2.5 V, 3 V, or 5 V | Using separate VIO supply |
| Package | 10-Lead MSOP | |
| Operating Temperature | −40°C to +85°C | |
| Integral Nonlinearity (INL) | ±1.5 LSB | |
| Dynamic Range | Up to 115 dB | Oversampling with postdigital filtering |
Key Features
- High Precision: 18-bit resolution with ±1.5 LSB integral nonlinearity (INL).
- Low Power Consumption: Power scales linearly with throughput, consuming as low as 50 µW at 1 kSPS, making it ideal for battery-powered applications.
- High-Speed Conversion: Capable of converting up to 250,000 samples per second (250 kSPS).
- Versatile Serial Interface: SPI-compatible interface with the ability to daisy-chain several ADCs on a single 3-wire bus and an optional busy indicator.
- Multiple Package Options: Available in 10-lead MSOP and 10-lead LFCSP (QFN) packages.
- Wide Operating Temperature Range: Specified to operate from −40°C to +85°C.
Applications
- Industrial Automation: Suitable for precision measurement and control systems.
- Medical Devices: Ideal for medical equipment requiring high accuracy and low power consumption.
- Aerospace and Defense: The AD7691-EP model supports defense and aerospace applications, adhering to AQEC standards.
- Battery-Powered Devices: Low power consumption makes it suitable for battery-powered applications.
- Multiplexed Channel Applications: No pipeline delay or latency, making it ideal for multiple multiplexed channel applications).
Q & A
- What is the resolution of the AD7691BRMZ-RL7 ADC?
The AD7691BRMZ-RL7 has an 18-bit resolution.
- What is the maximum conversion rate of the AD7691BRMZ-RL7?
The maximum conversion rate is up to 250 kSPS.
- What is the input range of the AD7691BRMZ-RL7?
The input range is ±5 V, with voltages on IN+ and IN- pins swinging in opposite phases between 0 V and REF.
- What are the power supply requirements for the AD7691BRMZ-RL7?
The power supply range is from 2.3 V to 5.25 V.
- Is the AD7691BRMZ-RL7 compatible with different logic levels?
Yes, it is compatible with 1.8 V, 2.5 V, 3 V, or 5 V logic using a separate VIO supply.
- What are the package options for the AD7691BRMZ-RL7?
It is available in 10-lead MSOP and 10-lead LFCSP (QFN) packages.
- What is the operating temperature range of the AD7691BRMZ-RL7?
The operating temperature range is from −40°C to +85°C.
- Does the AD7691BRMZ-RL7 support daisy-chaining?
Yes, it supports daisy-chaining several ADCs on a single 3-wire bus using the SPI-compatible interface.
- Is the AD7691BRMZ-RL7 suitable for battery-powered applications?
Yes, it is suitable due to its low power consumption, which scales linearly with throughput.
- What are some typical applications of the AD7691BRMZ-RL7?
Typical applications include industrial automation, medical devices, aerospace and defense, and battery-powered devices.
