AD9772A

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




Application

Communication Transmit Channel
W-CDMA Base Stations, Multicarrier Base Stations,
Direct IF Synthesis, Wideband Cable Systems
Instrumentation




Pinout

Specifications

Parameter	With Respect to	Min Max	Unit
AVDD, DVDD1-2, CLKVDD, PLLVDD AVDD, DVDD1-2, CLKVDD, PLLVDD ACOM, DCOM1-2, CLKCOM, PLLCOM REFIO, REFLO, FSADJ, SLEEP IOUTA, IOUTB DB0DB13, MOD0, MOD1, PLLLOCK CLK+, CLK DIV0, DIV1, RESET LPF Junction Temperature Storage Temperature Lead Temperature (10 sec)	ACOM, DCOM, CLKCOM, PLLCOM AVDD, DVDD1-2, CLKVDD, PLLVDD ACOM, DCOM1-2, CLKCOM, PLLCOM ACOM ACOM DCOM1-2 CLKCOM CLKCOM PLLCOM	0.3 +4.0 4.0 +4.0 0.3 +0.3 0.3AVDD + 0.3 1.0 AVDD + 0.3 0.3 DVDD + 0.3 0.3 CLKVDD + 0.3 0.3 CLKVDD + 0.3 0.3 PLLVDD + 0.3 125 65+150 300	V V V V V V V V V °C °C °C

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