The AD7689 supplied by Mingjiada Electronics is a high-performance, 16-bit, 8-channel, 250 kSPS PulSAR® successive approximation register (SAR) analogue-to-digital converter (ADC) developed by Analog Devices (ADI).
AD7689 Product Overview
The AD7689 is a highly integrated data acquisition chip that combines a high-performance ADC with a variety of signal chain components on a single chip:
Core Architecture: Utilises a charge-redistribution SAR architecture, ensuring zero pipelining delay and high-precision 16-bit conversion with no lost counts.
Analogue Front End: Features an on-chip 8-channel low-crosstalk multiplexer, which can be flexibly configured for single-ended (with or without ground sense), differential or pseudo-bipolar input modes.
Internal Integration: The device incorporates an optional low-drift reference voltage source (2.5 V or 4.096 V), a temperature sensor and an optional single-pole filter.
Control and Communication: An on-board channel timing controller enables automatic continuous scanning of multiple channels. The communication interface is SPI, compatible with MICROWIRE, QSPI and DSP.
Specifications
The following is a summary of the AD7689’s key technical specifications:
Resolution: 16-bit
Number of Channels: 8 channels (multiplexer inputs)
Sampling Rate: 250 kSPS (thousand samples per second)
Architecture: SAR (Successive Approximation Register)
Integral Non-Linearity (INL): Typical ±0.4 LSB; Maximum ±1.5 LSB
Dynamic Range: 93.8 dB
Signal-to-Noise-to-Distortion Ratio (SINAD) @20 kHz input: 92.5 dB
Total Harmonic Distortion (THD) @20 kHz input: -100 dB
Analogue input range: 0 V to VREF (VREF up to VDD)
Reference voltage source: Internally selectable (2.5 V/4.096 V) or externally supplied
Supply voltage (VDD): 2.3 V to 5.5 V
Logic interface voltage (VIO): 1.8 V to VDD
Power consumption: 12.5 mW at 5 V/250 kSPS; standby current 50 nA
Operating temperature range: –40 °C to +85 °C (some models support up to +125 °C)
Package: 20-pin LFCSP (4 mm × 4 mm) or WLCSP (2.4 mm × 2.4 mm)
AD7689 Key Features
Balance of high precision and low power consumption: Delivers 16-bit high precision at a sampling rate of 250 kSPS whilst maintaining extremely low power consumption, making it ideal for battery-powered or energy-sensitive devices.
Highly integrated for simplified design: The on-chip integration of a reference source, temperature sensor, channel sequencer and programmable filter significantly reduces the number of external components and simplifies PCB design.
Flexible input configuration: Eight analogue input channels can be independently configured for single-ended, differential or pseudo-bipolar modes, accommodating a wide variety of sensor signals.
Convenient digital interface: A wide-voltage-range SPI serial interface facilitates connection to a variety of mainstream microcontrollers (MCUs) and digital signal processors (DSPs).
Typical Applications
Owing to its outstanding performance and high level of integration, the AD7689 is widely used across multiple sectors:
Industrial and process control: Multi-channel system monitoring, power line monitoring, and data acquisition in factory automation.
Medical Equipment: High-precision acquisition of physiological signals such as electrocardiograms (ECG/EKG) and electroencephalograms (EEG).
Test and Measurement: High-precision data acquisition systems and seismic data acquisition systems.
Communications and Consumer Electronics: Mobile communication devices (GPS), battery-powered portable instruments and wearable health monitoring devices.
About Mingjiada Electronics
Shenzhen Mingjiada Electronics Co., Ltd. is a specialist distributor of electronic components with over 20 years’ industry experience. Mingjiada has long supplied a full range of ADI products, including data converters, amplifiers and processors, and offers them from stock.
Tags: AD7689BCPZ, AD7689BCP, AD7689BC, AD7689B, AD7689
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