FSO

ReferenceandBiasCircuits

Serial

Interface

LinearPhase

FIRDigitalFilter

DS

Modulator

VREFP VREFN

RBIAS

VMID

VCAP

AVDD

DVDD

IOVDD

DGND

AGND

AINP

AINN

FSO

SCLK

DOUT

SCLK

SYNC

CLK

DOUT

OTR

PD

REFEN

ADS1601

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

a

high-speed,

high-precision,

2

•

High Speed:

delta-sigma

analog-to-digital

converter

(ADC)

– Data Rate: 1.25MSPS

manufactured on an advanced CMOS process. The

– Bandwidth: 615kHz

ADS1601 oversampling topology reduces clock jitter

sensitivity during the sampling of high-frequency,

•

Outstanding Performance:

large amplitude signals by a factor of four over that

– SNR: 92dB at fIN = 100kHz, –1dBFS

achieved

by

Nyquist-rate

ADCs.

Consequently,

– THD: –103dB at fIN = 100kHz, –6dBFS

signal-to-noise ratio (SNR) is particularly improved.

Total harmonic distortion (THD) is

–103dB, and the

– SFDR: 105dB at fIN = 100kHz, –6dBFS

spurious-free dynamic range (SFDR) is 105dB

•

Ease-of-Use:

Optimized for power and performance, the ADS1601

– High-Speed 3-Wire Serial Interface

dissipates only 330mW while providing a full-scale

– Directly Connects to TMS320 DSPs

differential input range of

±0.94VREF. Having such a

– On-Chip Digital Filter Simplifies Anti-Alias

wide

input

range

makes

out-of-range

signals

Requirements

uncommon. The OTR pin indicates if an analog input

out-of-range condition does occur. The differential

– Simple Pin-Driven Control—No On-Chip

input signal is measured against the differential

Registers to Program

reference, which can be generated internally on the

– Selectable On-Chip Voltage Reference

ADS1601 or supplied externally.

– Simultaneous Sampling with Multiple

The ADS1601 uses an inherently stable advanced

ADS1601s

modulator with an on-chip decimation filter. The filter

•

Low Power:

stop

band

extends

to

19.3MHz,

which

greatly

simplifies the anti-aliasing circuitry. The modulator

– 330mW at 1.25MSPS

samples the input signal up to 20MSPS, depending

– 145mW at 625kSPS

on fCLK, while the 16x decimation filter uses a series

– Power-Down Mode

of four half-band FIR filter stages to provide 75dB of

stop band attenuation and 0.001dB of passband

APPLICATIONS

ripple.

•

Sonar

Output data is provided over a simple 3-wire serial

interface at rates up to 1.25MSPS, with a

–3dB

•

Vibration Analysis

bandwidth

of

615kHz.

The

output

data

or

its

•

Data Acquisition

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

×

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.

Copyright

© 2004–2011, Texas Instruments Incorporated

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.