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AD7656BSTZ

6-ch 16-bit 250kSPS SAR ADC, simultaneous sampling, ±10V/±5V, LQFP-64

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Manufacturer Part：

AD7656BSTZ

Package：

LQFP-64 (10 x 10 x 1.5 mm)

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Description

Product Overview

The AD7656BSTZ from Analog Devices is a 250kSPS, 6-channel, simultaneous sampling, bipolar 16-bit successive approximation ADC. Featuring pin/software-selectable ±10V/±5V input ranges and integrated 2.5V reference in a 64-lead LQFP package, it targets power monitoring and precision instrumentation applications.

Key Specifications

Resolution 16 bits
Channels 6 (3 simultaneous pairs)
Throughput Rate 250 kSPS
Input Range ±10V or ±5V (pin/software selectable)
SNR 86.5 dB @ 50kHz input
Power Dissipation 140 mW @ 250kSPS, 5V
Interface Parallel and Serial (SPI/daisy-chain)
Reference Internal 2.5V with buffer
Package LQFP-64 (10 x 10 mm)
Operating Temperature -40°C to +85°C

Features

  • Six independent 16-bit ADCs with simultaneous sampling in 3 pairs
  • True bipolar analog inputs with ±10V or ±5V selectable ranges
  • High throughput rate of 250kSPS across all 6 channels
  • Low power consumption of 140mW at 250kSPS with 5V supplies
  • High-speed parallel and serial (SPI/QSPI/daisy-chain) interface modes
  • Internal 2.5V reference with reference buffer
  • iCMOS process technology for high-voltage precision analog

Applications

  • Power line monitoring and measurement systems
  • Instrumentation and control systems
  • Multi-axis positioning and motion control
  • Motor control current and voltage sensing
  • Industrial data acquisition systems

The AD7656BSTZ from Analog Devices is a 6-channel, 16-bit, 250kSPS simultaneous sampling successive approximation ADC built on the iCMOS (industrial CMOS) process. It integrates six independent 16-bit ADC cores organized as three simultaneously sampling pairs, each controlled by its own CONVST signal. The device accepts true bipolar input signals in ±10V or ±5V ranges, selectable via pin or software. An internal 2.5V reference with buffer eliminates the need for an external reference in most applications. The AD7656 provides both a high-speed parallel interface and a serial interface (SPI/QSPI/MICROWIRE/DSP-compatible) with daisy-chain capability, making it versatile for different processor architectures. At only 140mW power consumption at 250kSPS, it is well-suited for power-sensitive industrial and instrumentation applications.

The AD7656 operates through four key subsystems. (1) The analog input stage uses on-chip wideband track-and-hold amplifiers that simultaneously sample the six analog inputs when triggered by the CONVST signals. The input range is selectable between ±4xVREF (±10V) and ±2xVREF (±5V) via the RANGE pin or software control. (2) The six SAR ADC cores perform 16-bit successive approximation conversion simultaneously within each pair, controlled by the CONVST A/B/C signals and an internal oscillator. Each conversion takes approximately 3μs, enabling the 250kSPS throughput rate. (3) The internal 2.5V reference provides the precision voltage for the DAC networks within each SAR core, with an on-chip buffer that can drive the reference input of multiple ADCs. (4) The data interface subsystem supports both parallel mode (using 16-bit data bus with RD/WR/CS control) and serial mode (SPI-compatible with daisy-chain capability for multi-device systems).

Pin Group Name Function
1-6 V1-V6 6 analog input channels
7 CONVST A Convert start for ADC pair A (V1/V2)
8 CONVST B Convert start for ADC pair B (V3/V4)
9 CONVST C Convert start for ADC pair C (V5/V6)
10 BUSY Conversion busy output
11 RANGE Input range selection (±10V/±5V)
12 RESET Reset input
13-28 DB0-DB15 Parallel data bus
29-64 Various SER/PAR, CS, RD, WR, VDD, VSS, AGND, DGND, REF, etc.
  • Three-phase power line monitoring with simultaneous voltage and current sampling
  • Industrial instrumentation systems requiring multi-channel synchronized measurement
  • Multi-axis motor control with simultaneous current and position feedback
  • Medical imaging data acquisition with 6-channel synchronized conversion
  • Seismic and vibration analysis systems requiring phase-coherent sampling
Model Manufacturer Key Difference
AD7656-1BSTZ Analog Devices Reduced decoupling version
AD7656ABSTZ Analog Devices Improved PSS robustness
AD7606-6BSTZ Analog Devices Next-gen, 6-ch, oversampling
ADS8568 TI 8-ch 16-bit 510kSPS, ±10V
LTC2326-16 Analog Devices 8-ch 16-bit 250kSPS, serial out
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Contact Information

Email: info@materialparts.com

Tel / WhatsApp: +86 13760382860

Service & Packaging

Materialparts is a professional electronic component supplier based in Shenzhen, China, with over 20 years of global trading experience. We integrate component procurement, quality inspection, technical support, customized packaging, and global delivery services to provide one-stop supply chain solutions. Our business covers industrial control, automotive electronics, consumer electronics, medical devices and other industries. We always adhere to genuine sources, stable supply and considerate after-sales service.

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Contact Information

For service consultation or packaging customization, please feel free to contact us:
Email: info@materialparts.com
Tel / WhatsApp: +86 13760382860
Address: Room 2919, Guoli Building, Huaqiang North, Futian District, Shenzhen, Guangdong, China
 

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