24-Bit, 8.5 mW, 109 dB,
128/64/32 kSPS ADCs
AD7767
FEATURES
GENERAL DESCRIPTION
Oversampled successive approximation (SAR) architecture
High performance ac and dc accuracy, low power
115.5 dB dynamic range, 32 kSPS (AD7767-2)
112.5 dB dynamic range, 64 kSPS (AD7767-1)
109.5 dB dynamic range, 128 kSPS (AD7767)
−118 dB THD
The AD7767/AD7767-1/AD7767-2 are high performance
24-bit oversampled SAR analog-to-digital converters (ADC).
The AD7767/AD7767-1/AD7767-2 combine the benefits of a
large dynamic range and input bandwidth, consuming 15 mW,
10.5 mW, and 8.5 mW power, respectively, all contained in a
16-lead TSSOP package.
Exceptionally low power
Ideal for ultralow power data acquisition (such as PCI- and
USB-based systems), the AD7767/AD7767-1/AD7767-2
provide 24-bit resolution. The combination of exceptional SNR,
wide dynamic range, and outstanding dc accuracy make the
AD7767/AD7767-1/AD7767-2 ideally suited for measuring
small signal changes over a wide dynamic range. This is
particularly suitable for applications where small changes on the
input are measured on larger ac or dc signals. In such an
application, the AD7767/AD7767-1/AD7767-2 accurately
gather both ac and dc information.
8.5 mW, 32 kSPS (AD7767-2)
10.5 mW, 64 kSPS (AD7767-1)
15 mW, 128 kSPS (AD7767)
High dc accuracy
24 bits, no missing codes (NMC)
INL: 3 ppm (typical), 7.6 ppm (maximum)
Low temperature drift
Zero error drift: 15 nV/°C
Gain error drift: 0.0075% FS
On-chip low-pass FIR filter
The AD7767/AD7767-1/AD7767-2 include an on-board digital
filter (complete with linear phase response) that acts to elimi-
nate out-of-band noise by filtering the oversampled input
voltage. The oversampled architecture also reduces front-end
antialias requirements. Other features of the AD7767 include a
Linear phase response
Pass-band ripple: 0.005 dB
Stop-band attenuation: 100 dB
2.5 V supply with 1.8 V/2.5 V/3 V/3.6 V logic interface options
Flexible interfacing options
SYNC PD
/
(synchronization/power-down) pin, allowing the
Synchronization of multiple devices
Daisy chain capability
Power-down function
synchronization of multiple AD7767 devices. The addition of
an SDI pin provides the option of daisy chaining multiple
AD7767 devices.
Temperature range: −40°C to +105°C
The AD7767/AD7767-1/AD7767-2 operate from a 2.5 V supply
using a 5 V reference. The devices operate from −40°C to +105°C.
APPLICATIONS
Low power PCI/USB data acquisition systems
Low power wireless acquisition systems
Vibration analysis
Instrumentation
High precision medical acquisition
RELATED DEVICES
Table 1. 24-Bit Analog-to-Digital Converters
Part No.
Description
AD7760
2.5 MSPS, 100 dB dynamic range1, on-board differential
amp and reference buffer, parallel, variable decimation
FUNCTIONAL BLOCK DIAGRAM
625 kSPS, 109 dB dynamic range1, on-board differential
amp and reference buffer, parallel/serial, variable
decimation
AV
AGND MCLK
DV
V
DGND
AD7762/
AD7763
DD
DD
DRIVE
V
REF+
312 kSPS, 109 dB dynamic range1, on-board differential
amp and reference buffer, variable decimation (pin)
156 kSPS, 112 dB dynamic range1, on-board differential
amp and reference buffer, variable decimation (pin)
128 kSPS, 109.5 dB1, 15 mW, 16-bit INL, serial interface
64 kSPS 112.5 dB1,10.5 mW, 16-bit INL, serial interface
32 kSPS, 115.5 dB1, 8.5 mW, 16-bit INL, serial interface
V
IN+
AD7764
AD7765
DIGITAL
FIR FILTER
SUCCESSIVE-
APPROXIMATION
ADC
SYNC/PD
CS
V
IN–
SERIAL INTERFACE
AND
CONTROL LOGIC
REFGND
AD7766
AD7767/
AD7767-1/
AD7767-2
AD7766-1
AD7766-2
SCLK DRDY SDO SDI
1 Dynamic range at maximum output data rate.
Figure 1.
Rev. 0
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarks and registeredtrademarks arethe property of their respective owners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
Fax: 781.461.3113
www.analog.com
©2007 Analog Devices, Inc. All rights reserved.
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