AD9260AS datasheet(1/45 Pages) AD

Part #	AD9260AS

Description	High Speed Oversampling CMOS ADC

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High Speed Oversampling CMOS ADC with

16-Bit Resolution at a 2.5 MHz Output Word Rate

AD9260

Rev. C

Information furnished by Analog Devices is believed to be accurate and reliable.

However, no responsibility is assumed by Analog Devices for its use, nor for any

infringements of patents or other rights of third parties that may result from its use.

Specifications subject to change without notice. No license is granted by implication

or otherwise under any patent or patent rights of Analog Devices. Trademarks and

registered trademarks are the property of their respective owners.

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel: 781.329.4700

www.analog.com

Fax: 781.326.8703

FEATURES

Monolithic 16-bit, oversampled A/D converter

8× oversampling mode, 20 MSPS clock

2.5 MHz output word rate

1.01 MHz signal passband with 0.004 dB ripple

Signal-to-noise ratio: 88.5 dB

Total harmonic distortion: –96 dB

Spurious-free dynamic range: 100 dB

Input referred noise: 0.6 LSB

Selectable oversampling ratio: 1×, 2×, 4×, 8×

Selectable power dissipation: 150 mW to 585 mW

85 dB stop-band attenuation

0.004 dB pass-band ripple

Linear phase

Single 5 V analog supply, 5 V/3 V digital supply

Synchronize capability for parallel ADC interface

Twos complement output data

44-lead MQFP

PRODUCT DESCRIPTION

The AD9260 is a 16-bit, high-speed oversampled analog-to-

digital converter (ADC) that offers exceptional dynamic range

over a wide bandwidth. The AD9260 is manufactured on an

advanced CMOS process. High dynamic range is achieved with

an oversampling ratio of 8× through the use of a proprietary

technique that combines the advantages of sigma-delta and

pipeline converter technologies. The AD9260 is a switched-

capacitor ADC with a nominal full-scale input range of 4 V. It

offers a differential input with 60 dB of common-mode rejec-

tion of common-mode signals. The signal range of each differ-

ential input is ±1 V centered on a 2.0 V common-mode level.

The on-chip decimation filter is configured for maximum

performance and flexibility. A series of three half-band FIR

filter stages provide 8× decimation filtering with 85 dB of stop-

band attenuation and 0.004 dB of pass-band ripple. An onboard

digital multiplexer allows the user to access data from the

various stages of the decimation filter. The on-chip

programmable reference and reference buffer amplifier are

configured for maximum accuracy and flexibility. An external

reference can also be chosen to suit the user’s specific dc

accuracy and drift requirements.

The AD9260 operates on a single +5 V supply, typically

consuming 585 mW of power. A power scaling circuit is

provided allowing the AD9260 to operate at power consump-

FUNCTIONAL BLOCK DIAGRAM

MULTIBIT

SIGMA-DELTA

MODULATOR

RESET/

SYNC

12-BIT:

20MHz

DIGITAL

DEMODULATOR

STAGE 1:2X

DECIMATION

FILTER

STAGE 2:2X

DECIMATION

FILTER

STAGE 3:2X

DECIMATION

FILTER

DVSS DVDD

16-BIT:

10MHz

16-BIT:

5MHz

16-BIT:

2.5MHz

MODE

REGISTER

REFERENCE

BUFFER

BANDGAP

REFERENCE

BIAS

CIRCUIT

CLOCK

BUFFER

AD9260

OTR

BIT1–

BIT16

DAV

CS

MODE

CLK

BIAS ADJUST

REFCOM

SENSE

VREF

COMMON

MODE

REF

BOTTOM

REF TOP

VINB

VINA

READ

Figure 1.

tion levels as low as 150 mW at reduced clock and data rates.

The AD9260 is available in a 44-lead MQFP package and is

specified to operate over the industrial temperature range.

PRODUCT HIGHLIGHTS

The AD9260 is fabricated on a very cost effective CMOS

process. High speed, precision, mixed-signal analog circuits are

combined with high density digital filter circuits. The AD9260

offers a complete single-chip 16-bit sampling ADC with a 2.5

MHz output data rate in a 44-lead MQFP.

Selectable Internal Decimation Filtering

—The AD9260

provides a high performance decimation filter with 0.004 dB

pass-band ripple and 85 dB of stop-band attenuation. The filter

is configurable with options for 1×, 2×, 4×, and 8× decimation.

Power Scaling

—The AD9260 consumes a low 585 mW of

power at 16-bit resolution and 2.5 MHz output data rate. Its

power can be scaled down to as low as 150 mW at reduced

clock rates.

Single Supply

—Both the analog and digital portions of the

AD9260 can operate off of a single +5 V supply, simplifying

system power supply design. The digital logic will also

accommodate a single +3 V supply for reduced power.

Similar Part No. - AD9260AS

Manufacturer	Part #	Datasheet	Description
Analog Devices	AD9260AS	572Kb / 36P	High-Speed Oversampling CMOS ADC with 16-Bit Resolution at a 2.5 MHz Output Word Rate REV.B

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Maxim Integrated Produc...	MAX1401	494Kb / 36P	3V, 18-Bit, Low-Power, Multichannel, Oversampling (Sigma-Delta) ADC Rev 1; 7/02
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Analog Devices	AD9260	1Mb / 44P	High Speed Oversampling CMOS ADC with 16-Bit Resolution at a 2.5 MHz Output Word Rate REV. C
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