
Dual, 16-Bit, 1230 MSPS,
TxDAC+ Digital-to-Analog Converter
Data Sheet
Rev. A
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FEATURES
Flexible LVDS interface allows byte or nibble load
Single-carrier W-CDMA ACLR = 80 dBc at 122.88 MHz IF
Analog output: adjustable 8.7 mA to 31.7 mA, RL = 25 Ω to 50 Ω
Integrated 2×/4× interpolator/complex modulator allows
carrier placement anywhere in the DAC bandwidth
Gain, dc offset, and phase adjustment for sideband
suppression
Multiple chip synchronization interfaces
High performance, low noise PLL clock multiplier
Digital inverse sinc filter
Low power: 1.2 W at 1.0 GSPS, 800 mW at 500 MSPS,
full operating conditions
48-lead, exposed paddle LFCSP
APPLICATIONS
Wireless infrastructure
W-CDMA, CDMA2000, TD-SCDMA, WiMAX, GSM, LTE
Digital high or low IF synthesis
Transmit diversity
Wideband communications: LMDS/MMDS, point-to-point
GENERAL DESCRIPTION
T
he AD9146 is a dual, 16-bit, high dynamic range digital-to-
analog converter (DAC) that provides a sample rate of 1000 MSPS
with nominal supplies and 1230 MSPS with increased supplies,
permitting multicarrier generation up to the Nyquist frequency.
The AD9146 TxDAC+ includes features optimized for direct
conversion transmit applications, including complex digital mod-
ulation, and gain and offset compensation. The DAC outputs
are optimized to interface seamlessly with analog quadrature
modulators, such as the ADL537x F-MOD series from Analog
Devices, Inc. A 3-wire serial port interface provides for program-
ming/readback of many internal parameters. Full-scale output
current can be programmed over a range of 8.7 mA to 31.7 mA.
The AD9146 comes in a 48-lead LFCSP.
PRODUCT HIGHLIGHTS
1. Ultralow noise and intermodulation distortion (IMD)
enable high quality synthesis of wideband signals from
baseband to high intermediate frequencies (IF).
2. Proprietary DAC output switching technique enhances
dynamic performance.
3. Current outputs are easily configured for various single-
ended or differential circuit topologies.
4. Compact LVDS digital interface offers reduced width
data bus.
COMPANION PRODUCTS
Additional companion products on the AD9146 product page TYPICAL SIGNAL CHAIN
NOTES
1. AQM = ANALOG QUADRATURE MODULATOR.
COMPLEX BASEBAND
DC
COMPLEX IF
fIF
RF
LO – fIF
DIGITAL
BASEBAND
PROCESSOR
PA
I DAC
Q DAC
2/4
SINC–1
2/4
SINC–1
ANTIALIASING
FILTER
AQM
LO
OFFSET
AND
GAIN ADJ
OFFSET
AND
GAIN ADJ
09691-
001
Figure 1.