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DAC1405D750 Datasheet, PDF (1/43 Pages) NXP Semiconductors – Dual 14-bit DAC, up to 750 Msps; 4× and 8× interpolating | |||
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DAC1405D750
Dual 14-bit DAC, up to 750 Msps; 4Ã and 8Ã interpolating
Rev. 01 â 10 March 2010
Preliminary data sheet
1. General description
The DAC1405D750 is a high-speed 14-bit dual channel Digital-to-Analog Converter
(DAC) with selectable 4Ã or 8Ã interpolating filters optimized for multi-carrier wireless
transmitters.
Thanks to its digital on-chip modulation, the DAC1405D750 allows the complex I and Q
inputs to be converted from BaseBand (BB) 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.
A 4Ã and 8Ã clock multiplier enables the DAC1405D750 to provide the appropriate
internal clocks from the internal PLL. The internal PLL can be bypassed enabling the use
of an external high frequency clock. The voltage regulator enables adjustment of the
output full-scale current.
2. Features and benefits
 Dual 14-bit resolution
 IMD3: 76 dBc; fs = 737.28 Msps;
 750 Msps maximum update rate
fo = 140 MHz
 ACPR: 71 dBc; 2-carrier WCDMA;
fs = 737.28 Msps; fo = 153.6 MHz
 Selectable 4à or 8à interpolation filters  Typical 1.2 W power dissipation at 4Ã
interpolation, PLL off and 740 Msps
 Input data rate up to 185 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 1.25 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 x / (sin x) function
 Twoâs complement or binary offset  Fully compatible SPI port
data format
 1.8 V/3.3 V CMOS input buffers
 Industrial temperature range from
â40 °C to +85 °C
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