AD7768

RECOMMENDED FOR NEW DESIGNS

8-Channel, 24-Bit, Simultaneous Sampling ADC, Power Scaling, 110.8 kHz BW

Data Sheet (Rev. D) Product Selection Table
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Overview

  • Precision ac and dc performance
  • 8-/4-channel simultaneous sampling
    • 256 kSPS maximum ADC ODR per channel
    • 108 dB dynamic range
    • 110.8 kHz maximum input bandwidth (−3 dB BW)
    • −120 dB THD, typical
    • ±2 ppm of full-scale range (FSR) integral nonlinearity (INL), ±50 μV offset error, ±30 ppm of FSR gain error
  • Optimized power dissipation vs. noise vs. input bandwidth
    • Selectable power, speed, and input bandwidth
      • Fast (highest speed): 110.8 kHz BW, 51.5 mW per channel
      • Median (half speed): 55.4 kHz BW, 27.5 mW per channel
      • Low power (lowest power): 13.8 kHz BW, 9.375 mW per channel
  • Per channel digital filter
  • Programmable input bandwidth/sampling rates
  • CRC error checking on data interface
  • Daisy-chaining
  • Linear phase digital filter
    • Low latency sinc5 filter
    • Wideband brick wall filter: ±0.005 dB ripple to 102.4 kHz
  • Analog input precharge buffers
  • Power supply
    • AVDD1 = 5.0 V, AVDD2 = 2.25 V to 5.0 V
    • IOVDD = 2.5 V to 3.3 V or IOVDD = 1.8 V
  • 64-lead LQFP package, no exposed pad
  • Temperature range: −40°C to +105°C

The AD7768/AD7768-4 are 8-channel and 4-channel 24-bit, simultaneous sampling, sigma-delta (Σ-Δ) analog-to-digital converters (ADCs) with power scaling and 110.8 kHz bandwidth. The devices have a Σ-Δ modulator and digital filter per channel, which enables synchronized sampling of ac and dc signals.

The AD7768/AD7768-4 achieve 108 dB dynamic range at a maximum input bandwidth of 110.8 kHz, combined with typical performance of ±2 ppm integral nonlinearity (INL), ±50 μV offset error, and ±30 ppm gain error.

The AD7768/AD7768-4 user can trade off input bandwidth, output data rate, and power dissipation, and select one of three power modes to optimize for noise targets and power consumption. The flexibility of the AD7768/AD7768-4 allows them to become reusable platforms for low power dc and high performance ac measurement modules.

The AD7768/AD7768-4 have three modes: fast mode (256 kSPS maximum, 110.8 kHz input bandwidth, 51.5 mW per channel), median mode (128 kSPS maximum, 55.4 kHz input bandwidth, 27.5 mW per channel) and low power mode (32 kSPS maximum, 13.8 kHz input bandwidth, 9.375 mW per channel).

The AD7768/AD7768-4 offer extensive digital filtering capabilities, such as a wideband, low ±0.005 dB pass-band ripple, antialiasing low-pass filter with sharp roll-off, and 105 dB attenuation at the Nyquist frequency.

Frequency domain measurements can use the wideband linear phase filter. This filter has a flat pass band (±0.005 dB ripple) from dc to 102.4 kHz at 256 kSPS, from dc to 51.2 kHz at 128 kSPS, or from dc to 12.8 kHz at 32 kSPS.

The AD7768/AD7768-4 also offer sinc response via a sinc5 filter, a low latency path for low bandwidth, and low noise measurements. The wideband and sinc5 filters can be selected and run on a per channel basis.

Within these filter options, the user can improve the dynamic range by selecting from decimation rates of ×32, ×64, ×128, ×256, ×512, and ×1024. The ability to vary the decimation filtering optimizes noise performance to the required input bandwidth.

Embedded analog functionality on each ADC channel makes design easier, such as a precharge buffer on each analog input that reduces analog input current and a precharge reference buffer per channel reduces input current and glitches on the reference input terminals.

The device operates with a 5 V AVDD1A and AVDD1B supply, a 2.25 V to 5.0 V AVDD2A and AVDD2B supply, and a 2.5 V to 3.3 V or 1.8 V IOVDD supply (see the 1.8 V IOVDD Operation section for specific requirements for operating at 1.8 V IOVDD).

The device requires an external reference; the absolute input reference voltage range is 1 V to AVDD1 − AVSS.

The specified operating temperature range is −40°C to +105°C. The device is housed in a 10 mm × 10 mm, 64-lead low profile quad flat package (LQFP) with a 12 mm × 12 mm printed circuit board (PCB) footprint.

APPLICATIONS

  • Data acquisition systems: USB/PXI/Ethernet
  • Instrumentation and industrial control loops
  • Audio test and measurement
  • Vibration and asset condition monitoring
  • 3-phase power quality analysis
  • Sonar
  • High precision medical electroencephalogram (EEG)/electromyography (EMG)/electrocardiogram (ECG)
AD7768
8-Channel, 24-Bit, Simultaneous Sampling ADC, Power Scaling, 110.8 kHz BW
AD7768/AD7768-4 Functional Block Diagram AD7768 Pin Configuration AD7768-CHIPS Functional Block Diagram AD7768-CHIPS Pin Configuration
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Documentation

Data Sheet 2

User Guide 1

Application Note 1

Technical Articles 3

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Software Resources

Device Drivers 5

Hardware Ecosystem

Parts Product Life Cycle Description
Analog to Digital Converters (ADCs) 1
AD7768-1
RECOMMENDED FOR NEW DESIGNS DC to 204 kHz, Dynamic Signal Analysis, Precision 24-Bit ADC with Power Scaling
Differential Amplifiers 3
ADA4945-1
RECOMMENDED FOR NEW DESIGNS High Speed, ±0.1 µV/˚C Offset Drift, Fully Differential ADC Driver
ADA4940-1
PRODUCTION Ultralow Power, Low Distortion ADC Driver
LTC6363
LAST TIME BUY Precision, Low Power Differential Amplifier/ADC Driver Family
LDO Linear Regulators 3
ADP7118
RECOMMENDED FOR NEW DESIGNS 20 V, 200 mA, Low Noise, CMOS LDO Linear Regulator
ADP7112
RECOMMENDED FOR NEW DESIGNS 20 V, 200 mA, Low Noise, CMOS LDO Linear Regulator
ADP7104
RECOMMENDED FOR NEW DESIGNS 20 V, 500 mA, Low Noise, CMOS LDO
Operational Amplifiers (Op Amps) 4
ADA4896-2
RECOMMENDED FOR NEW DESIGNS 1 nV/√Hz, Low Power, Rail-to-Rail Output Amplifiers
ADA4805-2
RECOMMENDED FOR NEW DESIGNS Dual, 0.2 µV/°C Offset Drift, 105 MHz Low Power, Low Noise, Rail-to-Rail Amplifier
ADA4807-2
RECOMMENDED FOR NEW DESIGNS

3.1 nV/√Hz, 1 mA, 180 MHz, Rail-to-Rail Input/Output Amplifier
LT3092
PRODUCTION 200mA 2-Terminal Programmable Current Source
Voltage References 7
ADR4550
PRODUCTION Ultra-Low-Noise, High-Accuracy 5.0V Voltage Reference
ADR441
PRODUCTION Ultralow Noise, LDO XFET® 2.5V Voltage Reference w/Current Sink and Source
ADR445
PRODUCTION Ultralow Noise, LDO XFET® 5.0V Voltage Reference w/Current Sink and Source
ADR444
PRODUCTION Ultralow Noise, LDO XFET® 4.096V Voltage Reference w/Current Sink and Source
ADR4525
PRODUCTION Ultra-Low-Noise, High-Accuracy 2.5V Voltage Reference
ADR4533
PRODUCTION Ultra-Low-Noise, High-Accuracy 3.3V Voltage Reference
ADR4540
PRODUCTION Ultra-Low-Noise, High-Accuracy 4.096V Voltage Reference
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Tools & Simulations

Precision ADC Driver Tool

The Precision ADC Driver Tool is a web application that simulates the performance of precision ADC and driver combinations. Potential issues with driver selection, kickback settling, and distortion are flagged, and design tradeoffs can be quickly evaluated. Simulations and calculations include system noise, distortion, and settling of the ADC input

Open Tool

IBIS Model 1

Design Tool 1

LTspice

LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.

Evaluation Kits

eval board
schematic 1
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AMC-ADA4807-2ARMZ

Amplifier Mezzanine Card for ADA4807-2

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Features and Benefits

  • Enables quick breadboarding and prototyping
  • User defined circuit configuration
  • Easy connection to other ADC evaluation boards

Product Details

The Analog Devices, Inc., amplifier mezzanine card (AMC) analog-to-digital converter (ADC) driver evaluates the performance of amplifiers in 8-lead, single and dual SOIC, 6-lead single SOT23, 8-lead dual MSOP, and 16-lead LFCSP packages. This add on board can be inserted on ADC evaluation boards using its 7-pin header. Figure 1 shows the AMC mounted on an Analog Devices, Inc., ADC evaluation board.

The AMC can support any of Analog Devices operational amplifiers and ADC drivers in different packages. The user can configure the ADC driver as a Sallen-Key low-pass, high-pass, or band-pass filter, as a multiple feedback low-pass, high-pass, or band-pass filter, or as an inverting and noninverting operational amplifier. The user can also configure the AMC to drive a single-ended, fully differential, or a single-ended signal to a differential ADC.

Optimized power and ground planes ensure low noise and high speed operation. Component placement and power supply bypassing are optimized for maximum circuit flexibility and performance. The AMC evaluation board accepts 0402 or 0603 surface mount technology (SMT) components, 1206 bypass capacitors, and 2.54 mm headers.

All components are placed on the primary side. No components are placed on the secondary side.

eval board
schematic 5
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schematic 8
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EVAL-AD7768

AD7768 Evaluation Board

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Features and Benefits

  • Full featured evaluation board for the AD7768
  • PC control in conjunction with the SDP-H1 System Demonstration Platform (EVAL-SDP-CH1Z)
  • PC software control and data analysis 
  • Time and frequency domain
  • Standalone hardware capability

Product Details

The EVAL-AD7768FMCZ evaluation kit features the AD7768 24-bit, 256 kSPS, analog-to-digital converter (ADC). A 7 V to 9 V external bench top supply is regulated to 5 V and 3.3 V to supply the AD7768 and support components. The EVAL-AD7768FMCZ board connects to the USB port of the PC via a connection to the EVAL-SDP-CH1Z motherboard.

The AD7768 evaluation software fully configures the AD7768 device register functionality and provides dc and ac time domain analysis in the form of waveform graphs, histograms, and associated noise analysis for ADC performance evaluation.

The EVAL-AD7768FMCZ is an evaluation board that allows the user to evaluate the features of the ADC. The user PC software executable controls the AD7768 over a USB cable through the EVAL-SDP-CH1Z System Demonstration Platform (SDP). The AD7768 evaluation software requires PC running Windows® 7 to Windows 10 with a USB 2.0 port.

Full specifications on the AD7768 are available in the product data sheet, which should be consulted in conjunction with this user guide when working with the evaluation board.

AMC-ADA4807-2ARMZ
Amplifier Mezzanine Card for ADA4807-2
AMC-ADA4XXX-2ARMZANGLE UG-1224 Image AMC-ADA4XXX-2ARMZBOTTOM AMC-ADA4XXX-2ARMZTOP
EVAL-AD7768
AD7768 Evaluation Board
EVAL-AD7768FMCZ SDP-H1 evaluation board layout EVAL-AD7768FMCZ Sample Board Configuration EVAL-AD7768FMCZ Sample FFT AD7768 Power THD Combinations

Latest Discussions

3 Weeks Ago
AD7768-8 to STM32H755ZIT6 SPI configuration
5 Weeks Ago
SDP-H1 Interface board will not communicate with computer
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Able to configure, but not able to read back data from ad7768 through iio device
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