ADS1675
www.ti.com .................................................................................................................................................. SBAS416B–DECEMBER 2008–REVISED JUNE 2009
4MSPS, 24-Bit Analog-to-Digital Converter
1
FEATURES
DESCRIPTION
2
•
AC Performance:
The ADS1675 is
a
high-speed, high-precision
103dB of Dynamic Range at 4MSPS
111dB of Dynamic Range at 125kSPS
–107dB THD
analog-to-digital converter (ADC). Using an advanced
delta-sigma (ΔΣ) architecture, it operates at speeds
up to 4MSPS with outstanding ac performance and
dc accuracy.
•
•
DC Accuracy:
3ppm INL
4µV/°C Offset Drift
4ppm/°C Gain Drift
The ADS1675 ADC is comprised of a low-drift
modulator with out-of-range detection and a dual-path
programmable digital filter. The dual filter path allows
the user to select between two post-processing filters:
Low-Latency or Wide-Bandwidth. The Low-Latency
filter settles quickly (as fast as 2.65µs) for
applications with large instantaneous changes, such
as a multiplexer. The Wide-Bandwidth path provides
Programmable Digital Filter with
User-Selectable Path:
–
–
Low-Latency: Completely settles in 2.65µs
Wide-Bandwidth: 1.7MHz BW with flat
passband
an
optimized
frequency
response
for
ac
measurements with a passband ripple of less than
±0.00002dB, stop band attenuation of 115dB, and a
bandwidth of 1.7MHz.
•
Flexible Read-Only Serial Interface:
–
–
Standard CMOS
Serialized LVDS
The device offers two speed modes with distinct
interface, resolution, and feature set. In the
high-speed mode the device can be set to operate at
either 4MSPS or 2MSPS. In the low-speed mode, it
can be set to operate at either 1MSPS, 500KSPS,
250KSPS or 125KSPS.
•
•
•
•
Easy Conversion Control with START Pin
Out-of-Range Detection
Supply: Analog +5V, Digital +3V
Power: 575mW
The ADS1675 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 ADS1675 to directly connect
to a wide range of microcontrollers, digital signal
processors (DSPs), or field-programmable grid arrays
(FPGAs).
APPLICATIONS
•
•
•
•
Automated Test Equipment
Medical Imaging
Scientific Instrumentation
Test and Measurement
VREFP VREFN CLK AVDD DVDD
Data Ready
Data Output
3x
CMOS and
PLL
LVDS
Compatible
Serial
Serial Shift Clock
Dual Filter
Path
Chip Select
Interface Configuration
The ADS1675 operates from an analog supply of 5V
and digital supply of 3V, and dissipates 575mW 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.
Interface
Low-Latency
Filter
AINP
AINN
DS
Master Clock
Filter Path
Data Rate
Modulator
Wide-Bandwidth
Filter
Start Conversion
Power Down
Control
Out-of-Range
ADS1675
AGND DGND
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Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas
Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
2
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 © 2008–2009, Texas Instruments Incorporated
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