ADS1672
www.ti.com .............................................................................................................................................................. SBAS402A–JUNE 2008–REVISED JULY 2008
625kSPS, 24-Bit Analog-to-Digital Converter
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FEATURES
DESCRIPTION
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AC Performance:
The ADS1672 is
a
high-speed, high-precision
107dB of Dynamic Range at 625kSPS
115.5dB of Dynamic Range at 78kSPS
–115dB THD
analog-to-digital converter (ADC). Using an advanced
delta-sigma (ΔΣ) architecture, it operates at speeds
up to 625kSPS with outstanding ac performance and
dc accuracy.
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DC Accuracy:
3ppm INL
2µV/°C Offset Drift
2ppm/°C Gain Drift
The ADS1672 ADC is comprised of a low-drift,
chopper-stabilized modulator with out-of-range
detection and a dual-path programmable digital filter.
The dual filter path allows the user to select between
Programmable Digital Filter with
User-Selectable Path:
two
post-processing
filters:
low-latency
or
wide-bandwidth. The low-latency filter settles quickly
in one cycle, for applications with large instantaneous
changes, such as a multiplexer. The wide-bandwidth
path provides an optimized frequency response for ac
measurements with a passband ripple of less than
0.001dB, stop band attenuation of 115dB, and a
bandwidth of 305kHz.
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Low-Latency: Completely settles in 5.5µs
Wide-Bandwidth: 305kHz BW with flat
passband
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Flexible Read-Only Serial Interface:
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Standard CMOS
Serialized LVDS
The ADS1672 is controlled through I/O pins—there
are no registers to program. A dedicated START pin
allows for direct control of conversions: toggle the
START pin to begin a conversion, and then retrieve
the output data. The flexible serial interface supports
data readback with either standard CMOS and LVDS
logic levels, allowing the ADS1672 to directly connect
to a wide range of microcontrollers, digital signal
processors (DSPs), or field-programmable grid arrays
(FPGAs).
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Easy Conversion Control with START Pin
Out-of-Range Detection
Supply: Analog +5V, Digital +3V
Power: 350mW
APPLICATIONS
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Automated Test Equipment
Vibration Analysis
Sonar
The ADS1672 operates from an analog supply of 5V
and digital supply of 3V, and dissipates 350mW of
power. When not in use, the PDWN pin can be used
to power down all device circuitry. The device is fully
specified over the industrial temperature range and is
offered in a TQFP-64 package.
Test and Measurement
Data Ready
Data Output
CMOS and
LVDS
Dual Filter
Path
Compatible
Serial
Interface
Serial Shift Clock
Chip Select
Interface Configuration
Low-Latency Filter
AINP
AINN
DS
Modulator
Master Clock
Filter Path
Data Rate
Wide-Bandwidth Filter
Start Conversion
Power Down
Control
Out-of-Range
ADS1672
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Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
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All trademarks are the property of their respective owners.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2008, Texas Instruments Incorporated