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AD7765 Datasheet(PDF) 1 Page - Analog Devices

Part No. AD7765
Description  24-Bit, 156 kSPS,112dB ADC, With On-Chip Buffers, Serial Interface
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

AD7765 Datasheet(HTML) 1 Page - Analog Devices

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24-Bit, 156 kSPS,112dB
Σ∆ ADC,
With On-Chip Buffers, Serial Interface
Preliminary Technical Data
AD7765
Rev. PrC
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibilityis assumedbyAnalogDevicesforitsuse,norforanyinfringements of patents or other
rightsofthirdpartiesthatmayresultfromitsuse.Specificationssubjecttochangewithoutnotice.No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.461.3113
©2006 Analog Devices, Inc. All rights reserved.
FEATURES
High performance 24-bit Sigma-Delta ADC
112dB SNR at 78kHz output data rate
109dB SNR at 156 kHz output data rate
156 kHz maximum fully filtered output word rate
Pin-selectable over-sampling rate (128x & 256x)
Flexible SPI serial interface
Fully differential modulator input
On-chip differential amplifier for signal buffering
On-chip Reference Buffer
Low pass FIR filter
Over-range alert pin
Digital gain correction registers
Power down mode
Synchronization of multiple devices via SYNC pin
Daisy Chaining
APPLICATIONS
Data acquisition systems
Vibration analysis
Instrumentation
PRODUCT OVERVIEW
The AD7765 high performance, 24-bit, sigma delta analog to
digital converter combines wide input bandwidth, high speed
and performance of 112dB at a 156Khz output data rate with
the benefits of sigma delta conversion, while, also offering
excellent DC specifications which make the converter ideal for
high speed data acquisition of AC signals where DC data is also
a requirement.
A wide dynamic range combined with significantly reduced
anti-aliasing requirements simplifies the design process. The
AD7765 offers pin-selectable decimation rates of 128x
and 256x. Other features include an integrated buffer to drive
the reference, a differential amplifier for signal buffering and
level shifting.
The addition of an internal gain register, an over-range alert
pin, and a low-pass digital FIR filter make the AD7765 a
compact highly integrated data acquisition device requiring
minimal peripheral component selection. The AD7765 is
ideally suited to applications demanding high SNR without
necessitating design of complex front end signal processing.
FUNCTIONAL BLOCK DIAGRAM
Multi-Bit
Sigma-Delta
Modulator
Reconstruction
Decimation
FIR Filter
Engine
DIFF
+
_
BUF
Interface Logic
and
Offset & Gain Correction
Registers
MCLK
SYNC
RESET/PWRDN
VIN-
VIN+
AD7765
VREF+
REFGND
AVDD1
AVDD2
AVDD3
DECAP
RBIAS
DVDD
OVERRANGE
AVDD4
VINA-
VINA+
VOUTA- VOUTA+
Figure 1.
The differential input is sampled at up to 40MS/s by an analog
modulator. The modulator output is processed by a series of
low-pass filters. The sample rate, filter corner frequencies and
output word rate are determined by the external clock
frequency supplied to the AD7765.
The reference voltage supplied to the AD7765 determines the
analog input range. With a 4V reference, the analog input range
is ±3.2V differential biased around a common mode of 2V. This
common mode biasing can be achieved using the on-chip
differential amplifiers, further reducing the external signal
conditioning requirements.
The AD7765 is available in a 28-lead TSSOP package and is
specified over the industrial temperature range from -40°C to
+85°C
RELATED DEVICES
Part no.
Description
AD7760
24-bit, 2.5MSPS, 100dB Σ∆, parallel interface
AD7762
24-bit, 625ksps, 109dB Σ∆, parallel interface
AD7763
24-bit, 625ksps, 109dB Σ∆, serial interface
AD7764
24-bit, 312kSPS, 109dB Σ∆, serial interface


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