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AD7112:  Dual CMOS Multiplying DAC with Anti-Log Transfer Function for Audio Volume Control Applications

Product Details


The LOGDAC ™ AD7112 is a monolithic dual multiplying D/A converter featuring a wide dynamic range and excellent DAC-to-DAC matching. Both DACs can attenuate an analog input signal over the range 0 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 on-board decode logic. This 8-bit word is decoded into a 17-bit weord thich 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 dyanmic 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.

LOGDAC is a registered trademark of Analog Devices, Inc.

FEATURES and BENEFITS

  • 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

Functional Block Diagram for AD7112

AD7112 Diagram
Functional Block Diagram for AD7112

Documentation

Title Content Type File Type
AD7112: Dual CMOS Multiplying DAC with Anti-Log Transfer Function for Audio Volume Control Applications Data Sheet  (Rev 0, 07/1992) (pdf, 230 kB) Data Sheets PDF
AN-364: Enhancing the Performance of the AD7111A and AD7112 LOGDACs  (pdf, 194 kB) Application Notes PDF
AN-208: 08: Understanding LOGDACs  (pdf, 156 kB)
LOGDACs are CMOS Multiplying DACs With an Expontial (Anti-Logarithmic) Digital-to-Analog Transfer Characteristic (Rather Than a Linear D/A Transfer Characteristic)
Application Notes PDF
Digital to Analog Converters ICs Solutions Bulletin  (pdf) Solutions Bulletins PDF
RAQs index Rarely Asked Questions HTML
Glossary of EE Terms Glossary HTML

Evaluation Kits & Symbols & Footprints

Symbols and Footprints— Analog Devices offers Symbols & Footprints which are compatible with a large set of today’s CAD systems for broader and easier support.


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