AD7763 ADC Datasheet

AD7763 Datasheet PDF, Equivalent


Part Number

AD7763

Description

24-Bit ADC

Manufacture

Analog Devices

Total Page 30 Pages
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AD7763
Data Sheet
24-Bit, 625 kSPS, 109 dB Sigma-Delta
ADC with On-Chip Buffers, Serial Interface
AD7763
FEATURES
120 dB dynamic range at 78 kHz output data rate
109 dB dynamic range at 625 kHz output data rate
112 dB SNR at 78 kHz output data rate
107 dB SNR at 625 kHz output data rate
625 kHz maximum fully filtered output word rate
Programmable oversampling rate (32× to 256×)
Flexible serial interface
Fully differential modulator input
On-chip differential amplifier for signal buffering
Low-pass finite impulse response (FIR) filter with default
or user-programmable coefficients
Overrange alert bit
Digital offset and gain correction registers
Low power and power-down modes
Synchronization of multiple devices via SYNC pin
I2S interface mode
APPLICATIONS
Data acquisition systems
Vibration analysis
Instrumentation
FUNCTIONAL BLOCK DIAGRAM
VIN– VIN+
DIFF
VREF+
REFGND
BUF
MCLK
MCLKGND
SYNC
RESET
SH2:0
ADR2:0
CDIV
AD7763
CONTROL LOGIC
I/O
OFFSET AND GAIN
REGISTERS
MULTIBIT
-
MODULATOR
RECONSTRUCTION
PROGRAMMABLE
DECIMATION
FIR FILTER
ENGINE
AVDD1
AVDD2
AVDD3
AVDD4
DECAPA
DECAPB
RBIAS
AGND
VDRIVE
DVDD
DGND
Figure 1.
GENERAL DESCRIPTION
The AD7763 high performance, 24-bit, Σ-Δ analog-to-digital
converter (ADC) combines wide input bandwidth and high
speed with the benefits of Σ-Δ conversion, as well as performance
of 107 dB SNR at 625 kSPS, making it ideal for high speed data
acquisition. A wide dynamic range, combined with significantly
reduced antialiasing requirements, simplifies the design process.
An integrated buffer to drive the reference, a differential ampli-
fier for signal buffering and level shifting, an overrange flag,
internal gain and offset registers, and a low-pass, digital FIR
filter make the AD7763 a compact, highly integrated data
acquisition device requiring minimal peripheral component
selection. In addition, the device offers programmable
decimation rates and a digital FIR filter, which can be user-
programmed to ensure that its characteristics are tailored for the
user’s application. The AD7763 is ideal for applications demanding
high SNR without necessitating the design of complex, front-
end signal processing.
The differential input is sampled at up to 40 MSPS by an analog
modulator. The modulator output is processed by a series of
low-pass filters, the final filter having default or user-programmable
coefficients. The sample rate, filter corner frequencies, and
output word rate are set by a combination of the external clock
frequency and the configuration registers of the AD7763.
The reference voltage supplied to the AD7763 determines the
analog input range. With a 4 V reference, the analog input range
is ±3.2 V differential-biased around a common mode of 2 V.
This common-mode biasing can be achieved using the on-chip
differential amplifiers, further reducing the external signal
conditioning requirements.
The AD7763 is available in an exposed paddle, 64-lead TQFP_EP
and is specified over the industrial temperature range from
−40°C to +85°C.
Table 1. Related Devices
Part No. Description
AD7760 24-bit, 2.5 MSPS, 100 dB Σ-Δ, parallel interface
AD7762 24-bit, 625 kSPS, 109 dB Σ-Δ, parallel interface
Rev. B
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AD7763
AD7763* Product Page Quick Links
Last Content Update: 11/01/2016
Comparable Parts
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Evaluation Kits
• AD7763 Evaluation Kit
Documentation
Application Notes
• AN-280: Mixed Signal Circuit Technologies
• AN-282: Fundamentals of Sampled Data Systems
• AN-283: Sigma-Delta ADCs and DACs
• AN-311: How to Reliably Protect CMOS Circuits Against
Power Supply Overvoltaging
• AN-342: Analog Signal-Handling for High Speed and
Accuracy
• AN-388: Using Sigma-Delta Converters-Part 1
• AN-389: Using Sigma-Delta Converters-Part 2
Data Sheet
• AD7763: 24-Bit, 625 kSPS, 109 dB Sigma-Delta ADC with
On Chip Buffers, Serial Interface Data Sheet
Software and Systems Requirements
• CED1Z FPGA Project for AD7763 with Nios driver
• EVAL-AD7763EDZ - AD7763 Evaluation Board -
Software
Tools and Simulations
• Sigma-Delta ADC Tutorial
Reference Materials
Technical Articles
• MS-2210: Designing Power Supplies for High Speed ADC
• Vibration Analysis Using ADCs Keeps Industrial
Equipment Working
Design Resources
• AD7763 Material Declaration
• PCN-PDN Information
• Quality And Reliability
• Symbols and Footprints
Discussions
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Features Data Sheet 24-Bit, 625 kSPS, 109 dB Sig ma-Delta ADC with On-Chip Buffers, Seri al Interface AD7763 FEATURES 120 dB dy namic range at 78 kHz output data rate 109 dB dynamic range at 625 kHz output data rate 112 dB SNR at 78 kHz output d ata rate 107 dB SNR at 625 kHz output d ata rate 625 kHz maximum fully filtered output word rate Programmable oversamp ling rate (32× to 256×) Flexible seri al interface Fully differential modulat or input On-chip differential amplifier for signal buffering Low-pass finite i mpulse response (FIR) filter with defau lt or user-programmable coefficients Ov errange alert bit Digital offset and ga in correction registers Low power and p ower-down modes Synchronization of mult iple devices via SYNC pin I2S interface mode APPLICATIONS Data acquisition sys tems Vibration analysis Instrumentation FUNCTIONAL BLOCK DIAGRAM VIN– VIN+ DIFF VREF+ REFGND BUF MCLK MCLKGND SYNC RESET SH2:0 ADR2:0 CDIV AD7763 CO NTROL LOGIC I/O OFFSET AND GAIN REGISTERS MULTIBIT - MOD.
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