AD4681

RECOMMENDED FOR NEW DESIGNS

Differential Inputs, 500 kSPS, Dual Simultaneous Sampling SAR ADCs

Data Sheet (Rev. A) Product Selection Table
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Overview

  • 16-bit ADC family
  • Dual simultaneous sampling
  • Fully differential analog inputs
  • Throughput conversion rate
    • 1 MSPS for AD4680
    • 500 kSPS for AD4681
  • SNR (typical)
    • 92.5 dB, VREF = 3.3 V external
    • 100 dB with 8× OSR, RES = 1
  • On-chip oversampling function
  • Resolution boost function
  • INL (maximum) 1.5 LSBs
  • 2.5 V internal reference at 10 ppm/°C
  • High speed serial interface
  • −40°C to +125°C operation
  • 3 mm × 3 mm, 16-lead LFCSP
  • Wide common-mode range
  • Alert function

The AD4680/AD4681 are 16-bit, pin-compatible, dual simultaneous sampling, high speed, low power, successive approximation register (SAR) analog-to-digital converters (ADCs) that operate from a 3.0 V to 3.6 V power supply and feature throughput rates of 1 MSPS for the AD4680 and 500 kSPS for the AD4681. The analog input type is differential, accepts a wide common-mode input voltage, and is sampled and converted on the falling edge of CS. Integrated on-chip oversampling blocks improve dynamic range and reduce noise at lower bandwidths. A buffered internal 2.5 V reference is included. Alternatively, an external reference up to 3.3 V can be used.

The conversion process and data acquisition use standard control inputs, allowing easy interfacing to microprocessors or digital signal processors (DSPs). The device is compatible with 1.8 V, 2.5 V, and 3.3 V interfaces using a separate logic supply. The AD4680/AD4681 are available in a 16-lead lead frame chip scale package (LFCSP) with operation specified from −40°C to +125°C.

APPLICATIONS

  • Motor control position feedback
  • Motor control current sense
  • Sonar
  • Power quality
  • Data acquisition systems
  • Erbium doped fiber amplifier (EDFA) applications
  • Inphase (I) and quadrature (Q) demodulation
AD4681
Differential Inputs, 500 kSPS, Dual Simultaneous Sampling SAR ADCs
AD4680/AD4681 Functional Block Diagram AD4680/AD4681 Pin Configuration
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Documentation

Data Sheet 1

Application Note 1

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Software Resources

Device Drivers 1

Hardware Ecosystem

Parts Product Life Cycle Description
Differential Amplifiers 1
ADA4940-2
PRODUCTION Ultralow Power, Low Distortion ADC Driver
LDO Linear Regulators 3
ADP7104
RECOMMENDED FOR NEW DESIGNS 20 V, 500 mA, Low Noise, CMOS LDO
ADP7182
RECOMMENDED FOR NEW DESIGNS –28 V, −200 mA, Low Noise, Linear Regulator
ADP166
PRODUCTION Very Low Quiescent Current, 150 mA, LDO Regulator
Operational Amplifiers (Op Amps) 3
ADA4807-2
RECOMMENDED FOR NEW DESIGNS

3.1 nV/√Hz, 1 mA, 180 MHz, Rail-to-Rail Input/Output Amplifier
ADA4805-2
RECOMMENDED FOR NEW DESIGNS Dual, 0.2 µV/°C Offset Drift, 105 MHz Low Power, Low Noise, Rail-to-Rail Amplifier
ADA4896-2
RECOMMENDED FOR NEW DESIGNS 1 nV/√Hz, Low Power, Rail-to-Rail Output Amplifiers
Voltage References 2
ADR4533
PRODUCTION Ultra-Low-Noise, High-Accuracy 3.3V Voltage Reference
ADR4525
PRODUCTION Ultra-Low-Noise, High-Accuracy 2.5V Voltage Reference
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Tools & Simulations

IBIS Model 1

Precision ADC Driver Tool

Use the Precision ADC Driver Tool to simulate the performance of precision ADC and driver combinations.

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Evaluation Kits

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schematic 4
EVAL-AD738xFMCZ

Evaluation board for the AD7380/AD7381 Dual Simultaneous Sampling 16/14-Bit SAR ADC.

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Features and Benefits

  • Full featured evaluation board multichannel, simultaneous sampling ADC
  • On-board reference, reference buffer, and ADC driver
  • On-board power supplies
  • Board-compatible, high speed system demonstration platform (SDP-H1) controller
  • PC software for control and data analysis

Product Details

The EVAL-AD7380FMCZ and EVAL-AD7381FMCZ are full featured evaluation boards that evaluate all features of the AD7380 and AD7381 analog-to-digital converters (ADCs). The evaluation boards can be controlled by the EVAL-SDP-CH1Z via the 160-way system demonstration platform (SDP) connector, J4. The EVAL-SDP-CH1Z board controls the evaluation boards through the USB port of a PC using the Analysis, Control, Evaluation (ACE) software, which is available for download from the ACE software page.

Complete specifications for the AD7380 and AD7381 are provided in the AD7380/AD7381 data sheet. Consult these specifications in conjunction with the user guide when using the evaluation boards. Full details on the EVAL-SDP-CH1Z are available on the SDP-H1 product page. The comprehensive ACE user guide is available on the ACE software page.

The EVAL-AD7380FMCZ can be used to evaluate the AD4680 and AD4681. The AD4680 and AD4681 have slower throughput rates (at 1 MSPS and 500 kSPS, respectively) than the AD7380. The throughput can be adjusted to fit for AD4680 and AD4681 by adjusting the clock speed and the sampling frequency.

Figure 1 in the user guide shows the typical setup of the EVAL-AD7380FMCZ board. The setup for the EVAL-AD7381FMCZ board is the same as the EVAL-AD7380FMCZ setup.

EVAL-AD738xFMCZ
Evaluation board for the AD7380/AD7381 Dual Simultaneous Sampling 16/14-Bit SAR ADC.
AD7380 AD7380 AD7380 EVAL-AD7380FMCZ-EVAL-AD7381FMCZ Image

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