ADS1601
www.ti.com
SBAS322D –DECEMBER 2004–REVISED OCTOBER 2011
16-Bit, 1.25MSPS Analog-to-Digital Converter
Check for Samples: ADS1601
1
FEATURES
DESCRIPTION
The ADS1601 is
delta-sigma analog-to-digital
a
high-speed, high-precision,
converter (ADC)
2
•
High Speed:
–
–
Data Rate: 1.25MSPS
Bandwidth: 615kHz
manufactured on an advanced CMOS process. The
ADS1601 oversampling topology reduces clock jitter
sensitivity during the sampling of high-frequency,
large amplitude signals by a factor of four over that
achieved by Nyquist-rate ADCs. Consequently,
signal-to-noise ratio (SNR) is particularly improved.
Total harmonic distortion (THD) is –103dB, and the
spurious-free dynamic range (SFDR) is 105dB
•
Outstanding Performance:
–
–
–
SNR: 92dB at fIN = 100kHz, –1dBFS
THD: –103dB at fIN = 100kHz, –6dBFS
SFDR: 105dB at fIN = 100kHz, –6dBFS
•
Ease-of-Use:
Optimized for power and performance, the ADS1601
dissipates only 330mW while providing a full-scale
differential input range of ±0.94VREF. Having such a
wide input range makes out-of-range signals
uncommon. The OTR pin indicates if an analog input
out-of-range condition does occur. The differential
input signal is measured against the differential
reference, which can be generated internally on the
ADS1601 or supplied externally.
–
–
–
High-Speed 3-Wire Serial Interface
Directly Connects to TMS320 DSPs
On-Chip Digital Filter Simplifies Anti-Alias
Requirements
–
Simple Pin-Driven Control—No On-Chip
Registers to Program
–
–
Selectable On-Chip Voltage Reference
Simultaneous Sampling with Multiple
ADS1601s
The ADS1601 uses an inherently stable advanced
modulator with an on-chip decimation filter. The filter
stop band extends to 19.3MHz, which greatly
simplifies the anti-aliasing circuitry. The modulator
samples the input signal up to 20MSPS, depending
on fCLK, while the 16x decimation filter uses a series
of four half-band FIR filter stages to provide 75dB of
stop band attenuation and 0.001dB of passband
ripple.
•
Low Power:
–
–
–
330mW at 1.25MSPS
145mW at 625kSPS
Power-Down Mode
APPLICATIONS
•
•
•
Sonar
Output data is provided over a simple 3-wire serial
interface at rates up to 1.25MSPS, with a –3dB
bandwidth of 615kHz. The output data or its
complementary format directly connects to DSPs
such as TI’s TMS320 family, FPGAs, or ASICs. A
dedicated synchronization pin enables simultaneous
sampling with multiple ADS1601s in multi-channel
systems. Power dissipation is set by an external
resistor that allows a reduction in dissipation when
operating at slower speeds. All of the ADS1601
features are controlled by dedicated I/O pins, which
simplify operation by eliminating the need for on-chip
registers.
Vibration Analysis
Data Acquisition
VREFP VREFN VMID RBIAS VCAP AVDD
DVDD
IOVDD
CLK
SYNC
FSO
FSO
Reference and Bias Circuits
SCLK
SCLK
Serial
AINP
AINN
DS
Linear Phase
Interface
Modulator
FIR Digital Filter
DOUT
DOUT
OTR
PD
ADS1601
The high performing, easy-to-use ADS1601 is
especially suitable for demanding measurement
applications in sonar, vibration analysis, and data
acquisition. The ADS1601 is offered in a small, 7mm
REFEN
AGND
DGND
×
7mm TQFP-48 package and is specified
from –40°C to +85°C.
1
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 © 2004–2011, Texas Instruments Incorporated
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