FEATURES
Dynamic Range: 88.5 dB Resolution: 0.375 dB On-Chip Data Latches for Both DACs Four-Quadrant Multiplication +5 V Operation Pin Compatible with AD7528 Low Power APPLICATIONS
Audio Attenuators Sonar Systems Function Generators LC2MOS LOGDAC Dual Logarithmic D/A Converter AD7112* FUNCTIONAL BLOCK DIAGRAM VDD VIN A RFB A OUT A AD7112 17-BIT DAC A 17-BIT LATCH DB0 DB7 8-BIT BUFFER DECODE LOGIC 17 17-BIT LATCH RFB B CONTROL LOGIC OUT B 17-BIT DAC B GENERAL DESCRIPTION
DAC A/ CS WR VIN B DAC B DGND AGND The LOGDAC® The degree of attenuation in either channel is determined by the 8-bit word applied to the onboard decode logic. This 8-bit word is decoded into a 17-bit word which is then loaded into one of the 17-bit data latches, determined by DACA/DACB. The fine step resolution over the entire dynamic range is due to the use of these 17-bit DACs. The AD7112 is easily interfaced to a standard 8-bit MPU bus via an 8-bit data port and standard microprocessor control lines. It should be noted that the AD7112 is exactly pin-compatible with the AD7528, an industry standard dual 8-bit multiplying DAC.
Analog Devices
