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FEATURES
Complete 14-Bit Voltage Output DAC
Parallel and Serial Interface Capability
80 dB Signal-to-Noise Ratio
Interfaces to High Speed DSP Processors
e.g., ADSP-2100, TMS32010, TMS32020
45 ns min WR Pulse Width
Low Power – 70 mW typ.
Operates from 65 V Supplies LC2MOS
Complete 14-Bit DAC
AD7840
FUNCTIONAL BLOCK DIAGRAM GENERAL DESCRIPTION PRODUCT HIGHLIGHTS The AD7840 is a fast, complete 14-bit voltage output D/A converter. It consists of a 14-bit DAC, 3 V buried Zener reference,
DAC output amplifier and high speed control logic. 1. Complete 14-Bit D/A Function
The AD7840 provides the complete function for creating ac
signals and dc voltages to 14-bit accuracy. The part features
an on-chip reference, an output buffer amplifier and 14-bit
D/A converter. The part features double-buffered interface logic with a 14-bit
input latch and 14-bit DAC latch. Data is loaded to the input
latch in either of two modes, parallel or serial. This data is then
transferred to the DAC latch under control of an asynchronous
LDAC signal. A fast data setup time of 21 ns allows direct
parallel interfacing to digital signal processors and high speed …