ꢍ ꢓꢋ ꢀꢁ ꢙꢀ
SBAS322 − DECEMBER 2004
ꢀꢁ ꢂ ꢃꢄ ꢅ ꢆ ꢀꢇ ꢈꢉ ꢊꢋ ꢌꢋ
ꢍ ꢎ ꢏꢐ ꢑꢒꢂ ꢅ ꢑꢂ ꢓ ꢄ ꢒꢄ ꢅꢏ ꢐ ꢔꢕ ꢑꢎꢖ ꢗ ꢘ ꢅꢗ ꢘ
FEATURES
DESCRIPTION
The ADS1601 is
a
high-speed, high-precision,
D
High Speed:
delta-sigma
analog-to-digital
converter
(ADC)
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.
D
Outstanding Performance:
SNR: 92dB at f = 100kHz, −1dBFS
THD: −103dB at f = 100kHz, −6dBFS
SFDR: 105dB at f = 100kHz, −6dBFS
IN
IN
IN
D
Ease-of-Use:
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
Optimized for power and performance, the ADS1601
dissipates only 330mW while providing a full-scale
differential input range of 3V. Having such a wide input
range makes out-of-range signals unlikely. 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 or
supplied externally on the ADS1601.
D
Low Power:
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.
330mW at 1.25MSPS
145mW at 625kSPS
Power-Down Mode
APPLICATIONS
D
D
D
Sonar
Vibration Analysis
Data Acquisition
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.
VREFP VREFN VMID RBIAS VCAP AVDD
Reference and Bias Circuits
DVDD
IOVDD
CLK
SYNC
FSO
FSO
SCLK
SCLK
Serial
Interface
AINP
AINN
∆Σ
Modulator
Linear Phase
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 x 7mm TQFP-48
package and is specified from −40°C to +85°C.
REFEN
AGND
DGND
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.
All trademarks are the property of their respective owners.
ꢌꢚ ꢛ ꢓꢜ ꢕ ꢝꢞ ꢛꢟ ꢓ ꢍꢝꢍ ꢄꢎ ꢠꢑ ꢘ ꢡꢏ ꢅꢄꢑꢎ ꢄꢢ ꢣꢤ ꢘ ꢘ ꢗꢎꢅ ꢏꢢ ꢑꢠ ꢥꢤꢦ ꢐꢄꢣ ꢏꢅꢄ ꢑꢎ ꢧꢏ ꢅꢗꢇ ꢌꢘ ꢑꢧꢤ ꢣꢅꢢ
ꢣ ꢑꢎ ꢠꢑꢘ ꢡ ꢅꢑ ꢢ ꢥꢗ ꢣ ꢄ ꢠꢄ ꢣ ꢏ ꢅꢄ ꢑꢎꢢ ꢥ ꢗꢘ ꢅꢨꢗ ꢅꢗ ꢘ ꢡꢢ ꢑꢠ ꢝꢗꢩ ꢏꢢ ꢞꢎꢢ ꢅꢘ ꢤꢡ ꢗꢎꢅ ꢢ ꢢꢅ ꢏꢎꢧ ꢏꢘ ꢧ ꢪ ꢏꢘ ꢘ ꢏ ꢎꢅꢫꢇ
ꢌꢘ ꢑ ꢧꢤꢣ ꢅ ꢄꢑ ꢎ ꢥꢘ ꢑ ꢣ ꢗ ꢢ ꢢ ꢄꢎ ꢒ ꢧꢑ ꢗ ꢢ ꢎꢑꢅ ꢎꢗ ꢣꢗ ꢢꢢ ꢏꢘ ꢄꢐ ꢫ ꢄꢎꢣ ꢐꢤꢧ ꢗ ꢅꢗ ꢢꢅꢄ ꢎꢒ ꢑꢠ ꢏꢐ ꢐ ꢥꢏ ꢘ ꢏꢡ ꢗꢅꢗ ꢘ ꢢꢇ
Copyright 2004, Texas Instruments Incorporated
www.ti.com
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