AD7112BN

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

GENERAL DESCRIPTION

 The LOGDAC® AD7112 is a monolithic dual multiplying D/A converter featuring wide dynamic range and excellent DAC-toDAC matching. Both DACs can attenuate an analog input signal over the range 0 dB to 88.5 dB in 0.375 dB steps. It is available in skinny 0.3" wide 20-pin DIPs and in 20-terminal surface mount packages.

 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. This allows an easy upgrading of existing AD7528 designs which would benefit both from the wider dynamic range and the finer step resolution offered by the AD7112.

 The AD7112 is fabricated in Linear Compatible CMOS (LC2MOS), an advanced, mixed technology process that combines precision bipolar circuits with low power CMOS logic.

PRODUCT HIGHLIGHTS

 1. DAC-to-DAC Matching: Since both of the AD7112 DACs are fabricated at the same time on the same chip, precise matching and tracking between the two DACs is inherent.

 2. Small Package: The AD7112 is available in a 20-pin DIP and a 20-terminal SOIC package.

 3. Fast Microprocessor Interface: The AD7112 has bus interface timing compatible with all modern microprocessors

Feature

(Picture: Pinout)