SBAS322 − DECEMBER 2004
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FEATURES
C0068 High Speed:
Data Rate: 1.25MSPS
Bandwidth: 615kHz
C0068 Outstanding Performance:
SNR: 92dB at f
IN
= 100kHz, −1dBFS
THD: −103dB at f
IN
= 100kHz, −6dBFS
SFDR: 105dB at f
IN
= 100kHz, −6dBFS
C0068 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
C0068 Low Power:
330mW at 1.25MSPS
145mW at 625kSPS
Power-Down Mode
APPLICATIONS
C0068 Sonar
C0068 Vibration Analysis
C0068 Data Acquisition
FSO
Reference and Bias Circuits
Serial
InterfaceLinear Phase
FIR Digital Filter
∆Σ
Modulator
VREFP VREFN RBIASVMID VCAP AVDD DVDD IOVDD
DGNDAGND
AINP
AINN
FSO
SCLK
DOUT
SCLK
SYNC
CLK
DOUT
OTR
PD
REFEN
ADS1601
DESCRIPTION
The ADS1601 is a high-speed, high-precision,
delta-sigma analog-to-digital converter (ADC)
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.
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.
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 f
CLK
, 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.
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.
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.
All trademarks are the property of their respective owners.
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Copyright  2004, Texas Instruments Incorporated
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