AD7766 Datasheet, PDF (1/18 Pages) Analog Devices – 24-Bit, 10mW, 125ksps Analog to Digital Converter in 16 lead TSSOP

Preliminary Technical Data
24-Bit, 10mW, 125ksps Analog to Digital
Converter in 16 lead TSSOP
AD7766
FEATURES
High performance 24-bit ADC
114dB SNR at 31.25 KHz output data rate
111dB SNR at 62.5 KHz output data rate
108dB SNR at 125 KHz output data rate
Max 20mW Power Consumption
10mW typ at 31.25 KHz output data rate
12mW typ at 62.5 KHz output data rate
15 mW typ at 125 KHz output data rate
High DC accuracy
24 Bits No Missing Codes (NMC)
Integral Non Linearity 15 ppm
Low temperature drift
Offset Drift ±25 nV/°C
On Chip Low pass FIR filter
Linear Phase Response
Passband Ripple: ±0.005dB
Stopband Attenuation: 100dB
2.5V Supply with 1.8V/2.5V/3V/3.6V logic interface
Flexible Interfacing options
Synchronization of multiple devices
Daisy Chain capability
Temp Range -40^oC to 105^oC
APPLICATIONS
Low-Power PCI/USB Data Acquisition Systems
Low-Power Wireless Acquisition Systems
Vibration Analysis
Instrumentation
FUNCTIONAL BLOCK DIAGRAM
AVDD AGND
MCLK DVDD VDRIVE DGND
VREF+
VIN+
VIN-
CONVERTER
DIGITAL
FIR FILTER
REFGND
AD7766/
AD7766-1/
AD7766-2
SERIAL INTERFACE
&
CONTROL LOGIC
SCLK DRDY SDO SDI
Figure 1.
SYNC/PD
CS
Rev. PrD
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PRODUCT OVERVIEW
The AD7766 is high performance 24-bit over-sampled analog to
digital converter combining wide dynamic range and input
bandwidth with an on chip FIR filter while consuming only
20mW max power in a 16 pin TSSOP package.
Specifically designed for ultra low power data acquisition,
providing 24-bit resolution and high SNR makes the device
ideal for measuring small signal changes over a wide dynamic
range. This is particularly important in many data acquisition
applications where small changes are measured on larger AC or
DC signals. In addition the AD7766 provides excellent DC
accuracy and drift specifications making the device suitable
where DC data also needs to be acquired. The AD7766
improves SNR performance and simplifies anti aliasing
requirements through over-sampling which is important in
minimizing input signal distortion to the inputs of the ADC. A
high performance on-chip FIR filter subsequently filters the
over-sampled data and removes out of band noise. A SYNC/PD
(Synchronisation/Power down) pin is an added feature,
allowing for easy synchronization of multiple devices. The
device operates from -40^oC to 105^oC.
By combining wide dynamic range and high SNR at output data
rates up to 125ksps with ultra low power the AD7766 provides a
compact solution for low power data acquisition such as PCI or
USB based systems.
RELATED DEVICES
Table 1. 24 bit Analog to Digital Converters
Part No
Speed Description
AD7760
AD7762/3
AD7764
AD7765
AD7767
2.5MSPs
625KSPs
312KSps
156KSPs
125KSPs
100dB Dynamic Range¹
On-board Diff Amp & Ref Buffer
Parallel, Variable Decimation
109dB Dynamic Range¹
On-Board Diff Amp & Ref buffer
Parallel/Serial, Variable Decimation
109dB Dynamic Range¹
On-board Diff Amp & Ref Buffer
Serial, Variable Decimation (pin)
112dB Dynamic Range¹
On-board Diff Amp & Ref Buffer
Serial,Variable Decimation (pin)
109dB Dynamic Range¹
10mW power dissipation
Serial interface
1 _{Dynamic Range at max output data rate.}
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