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1. General description
The DAC1405D650 is a high-speed 14-bit dual channel Digital-to-Analog Converter
(DAC) with selectable 2, 4 or 8 interpolating filters optimized for multi-carrier wireless
transmitters.
Thanks to its digital on-chip modulation, the DAC1405D650 allows the complex I and Q
inputs to be converted up from baseband to IF. The mixing frequency is adjusted via a
Serial Peripheral Interface (SPI) with a 32-bit Numerically Controlled Oscillator (NCO) and
the phase is controlled by a 16-bit register.
Two modes of operation are available: separate data ports or a single interleaved
high-speed data port. In the Interleaved mode, the input data stream is demultiplexed into
its original I and Q data and then latched.
The DAC1405D650 also includes a 2, 4 and 8 clock multiplier which provides the
appropriate internal clocks and an internal regulator to adjust the output full-scale current.
2. Features and benefits
DAC1405D650
Dual 14-bit DAC, up to 650 Msps; 2, 4 and 8 interpolating
Rev. 05 — 2 July 2012 Product data sheet
Dual 14-bit resolution IMD3: 80 dBc; f
s
= 640 Msps; f
o
=96MHz
650 Msps maximum update rate ACPR: 71 dBc; 2 carriers WCDMA;
f
s
= 614.4 Msps; f
o
= 96 MHz; PLL on
Selectable 2, 4 or 8 interpolation
filters
Typical 0.95 W power dissipation at 4
interpolation
Input data rate up to 160 Msps Power-down and Sleep modes
Very low noise cap-free integrated PLL Differential scalable output current from
1.6 mA to 22 mA
32-bit programmable NCO frequency On-chip 1.29 V reference
Dual port or Interleaved data modes External analog offset control
(10-bit auxiliary DACs)
1.8 V and 3.3 V power supplies Internal digital offset control
LVDS compatible clock Inverse (sin x) / x function
Two’s complement or binary offset
data format
Fully compatible SPI port
3.3 V CMOS input buffers Industrial temperature range from
40 C to +85 C
