AD9772A datasheet(1/32 Pages) AD

номер детали	AD9772A

подробное описание детали	14-Bit, 160 MSPS TxDAC with 2x Interpolation Filter

PDF	32 Pages

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производитель	AD [Analog Devices]

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REV. A

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. No license is granted by implication or otherwise

under any patent or patent rights of Analog Devices.

a

AD9772A

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

14-Bit, 160 MSPS TxDAC+®

with 2

Interpolation Filter

FUNCTIONAL BLOCK DIAGRAM

14-BIT DAC

2

FIR

INTER-

POLATION

FILTER

EDGE-

TRIGGERED

LATCHES

CLOCK DISTRIBUTION

AND MODE SELECT

2 /4

MUX

CONTROL

FILTER

CONTROL

1 /2

1

PLL CLOCK

MULTIPLIER

+1.2V REFERENCE

AND CONTROL AMP

AD9772A

CLKCOM

CLKVDD

MOD0 MOD1 RESET PLLLOCK DIV0 DIV1

CLK+

CLK–

DATA

INPUTS

(DB13...

DB0)

SLEEP

DCOM DVDD

ACOM AVDD

REFLO

PLLCOM

LPF

PLLVDD

IOUTA

IOUTB

REFIO

FSADJ

ZERO

STUFF

MUX

FEATURES

Single 3.0 V to 3.6 V Supply

14-Bit DAC Resolution and Input Data Width

160 MSPS Input Data Rate

67.5 MHz Reconstruction Passband @ 160 MSPS

74 dBc SFDR @ 25 MHz

2

Interpolation Filter with High- or Low-Pass Response

73 dB Image Rejection with 0.005 dB Passband Ripple

“Zero-Stuffing” Option for Enhanced Direct IF

Performance

Internal 2 /4

Clock Multiplier

250 mW Power Dissipation; 13 mW with Power-Down

Mode

48-Lead LQFP Package

APPLICATIONS

Communication Transmit Channel

W-CDMA Base Stations, Multicarrier Base Stations,

Direct IF Synthesis, Wideband Cable Systems

Instrumentation

PRODUCT DESCRIPTION

The AD9772A is a single-supply, oversampling, 14-bit digital-

to-analog converter (DAC) optimized for baseband or IF

waveform reconstruction applications requiring exceptional

dynamic range. Manufactured on an advanced CMOS process,

it integrates a complete, low distortion 14-bit DAC with a 2

digital interpolation filter and clock multiplier. The on-chip

PLL clock multiplier provides all the necessary clocks for the

digital filter and the 14-bit DAC. A flexible differential clock

input allows for a single-ended or differential clock driver for

optimum jitter performance.

For baseband applications, the 2

digital interpolation filter

provides a low-pass response, hence providing up to a threefold

reduction in the complexity of the analog reconstruction filter. It

does so by multiplying the input data rate by a factor of two

while simultaneously suppressing the original upper in-band

image by more than 73 dB. For direct IF applications, the 2

digital interpolation filter response can be reconfigured to select

the upper in-band image (i.e., high-pass response) while suppress-

ing the original baseband image. To increase the signal level of

the higher IF images and their passband flatness in direct IF

applications, the AD9772A also features a “zero stuffing” option

in which the data following the 2

interpolation filter is upsampled

by a factor of two by inserting midscale data samples.

The AD9772A can reconstruct full-scale waveforms with band-

widths as high as 67.5 MHz while operating at an input data rate of

160 MSPS. The 14-bit DAC provides differential current outputs

to support differential or single-ended applications. A segmented

current source architecture is combined with a proprietary

switching technique to reduce spurious components and enhance

dynamic performance. Matching between the two current outputs

ensures enhanced dynamic performance in a differential output

configuration. The differential current outputs may be fed into a

transformer or a differential op amp topology to obtain a single-

ended output voltage using an appropriate resistive load.

The on-chip bandgap reference and control amplifier are config-

ured for maximum accuracy and flexibility. The AD9772A can

be driven by the on-chip reference or by a variety of external

reference voltages. The full-scale current of the AD9772A can

be adjusted over a 2 mA to 20 mA range, thus providing addi-

tional gain ranging capabilities.

The AD9772A is available in a 48-lead LQFP package and

specified for operation over the industrial temperature range

of –40

°C to +85°C.

PRODUCT HIGHLIGHTS

1. A flexible, low power 2

interpolation filter supporting

reconstruction bandwidths of up to 67.5 MHz can be config-

ured for a low- or high-pass response with 73 dB of image

rejection for traditional baseband or direct IF applications.

2. A “zero-stuffing” option enhances direct IF applications.

3. A low glitch, fast settling 14-bit DAC provides exceptional

dynamic range for both baseband and direct IF waveform

reconstruction applications.

4. The AD9772A digital interface, consisting of edge-

triggered latches and a flexible differential or single-ended

clock input, can support input data rates up to 160 MSPS.

5. On-chip PLL clock multiplier generates all of the inter-

nal high-speed clocks required by the interpolation filter

and DAC.

6. The current output(s) of the AD9772A can easily be config-

ured for various single-ended or differential circuit topologies.

TxDAC+ is a registered trademark of Analog Devices, Inc.

Аналогичный номер детали - AD9772A

производитель	номер детали	датащи	подробное описание детали
Analog Devices	AD9772A	881Kb / 40P	14-Bit, 160 MSPS TxDAC with 2횞 Interpolation Filter Rev. C
	AD9772A-EB	881Kb / 40P	14-Bit, 160 MSPS TxDAC with 2횞 Interpolation Filter Rev. C
	AD9772AAST	881Kb / 40P	14-Bit, 160 MSPS TxDAC with 2횞 Interpolation Filter Rev. C
	AD9772AASTRL	881Kb / 40P	14-Bit, 160 MSPS TxDAC with 2횞 Interpolation Filter Rev. C
	AD9772AASTZ	881Kb / 40P	14-Bit, 160 MSPS TxDAC with 2횞 Interpolation Filter Rev. C

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Аналогичное описание - AD9772A

производитель	номер детали	датащи	подробное описание детали
Analog Devices	AD9761	246Kb / 23P	Dual 10-Bit TxDAC??with 2x Interpolation Filters REV.A
	AD9772	340Kb / 30P	14-Bit, 150 MSPS TxDAC??with 2x Interpolation Filter REV.0
	AD9774	313Kb / 24P	14-Bit, 32 MSPS TxDAC??with 4x Interpolation Filters REV.B
	AD9775	5Mb / 48P	14-Bit, 160 MSPS 2X/4X/8X Interpolating Dual TxDAC D/A Converter REV.0
	AD9784	1Mb / 52P	14-Bit, 200 MSPS/500 MSPS TxDAC with 2횞/4횞/8횞 Interpolation and Signal Processing
	AD9777BSVZ	1Mb / 60P	16-Bit, 160 MSPS 2x/4x/8x Interpolating Dual TxDAC D/A Converter REV. C
	AD9774ASZ	302Kb / 24P	14-Bit, 32 MSPS TxDAC??with 43 Interpolation Filters REV. B
	AD9772	389Kb / 30P	14 BIT 150 MSPS T DAC WITH 2 INTERPOLATION FILTER REV. 0
	AD9784	1Mb / 52P	14-Bit, 200 MSPS/500 MSPS TxDAC Rev. PrC
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