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AD7111ACRZ Datenblatt(PDF) 1 Page - Analog Devices |
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AD7111ACRZ Datenblatt(HTML) 1 Page - Analog Devices |
1 / 8 page REV. 0 Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. a LC2MOS LOGDAC Logarithmic D/A Converter AD7111/AD7111A One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 617/329-4700 Fax: 617/326-8703 FUNCTIONAL BLOCK DIAGRAMS 17-BIT DAC 17-BIT LATCH DECODE LOGIC 8-BIT BUFFER CONTROL LOGIC AD7111 I OUT AGND R FB V DD V IN DGND CS WR D0 – D7 17-BIT DAC 17-BIT LATCH DECODE LOGIC 8-BIT BUFFER CONTROL LOGIC AD7111A I OUT AGND R FB V DD V IN DGND CS WR D0 – D7 FEATURES Dynamic Range: 88.5 dB Resolution: 0.375 dB On-Chip Data Latches +5 V Operation AD7111A Pin Compatible with AD7524 Low Power APPLICATIONS Audio Attenuators Sonar Systems Function Generators Digitally Controlled AGC System GENERAL DESCRIPTION The LOGDAC® AD7111/AD7111A are monolithic multiplying D/A converters featuring wide dynamic range in a small pack- age. Both DACs can attenuate an analog input signal over the range 0 dB to 88.5 dB in 0.375 dB steps. They are available in 16-pin DIPs and SOIC packages. The AD7111 is also available in a 20-terminal LCCC package. The degree of attenuation across the DAC is determined by an 8-bit word applied to the onboard decode logic. This 8-bit word is decoded into a 17-bit word which is then applied to a 17-bit R-2R ladder. The very fine step resolution, which is available over the entire dynamic range, is due to the use of this 17-bit DAC. The AD7111/AD7111A are easily interfaced to a standard 8-bit MPU bus via an 8-bit data port and standard microprocessor control lines. The AD7111 WR input is edge triggered and re- quires a rising edge to load new data to the DAC. The AD7111A WR is level triggered to allow transparent operation of the latches, if required. It should also be noted that the AD7111A is exactly pin and function-compatible with the AD7524, an in- dustry standard 8-bit multiplying DAC. This allows an easy up- grading of existing AD7524 designs which would benefit both from the wider dynamic range and the finer step resolution of- fered by the AD7111A. The AD7111/AD7111A are fabricated in Linear Compatible CMOS (LC 2MOS), an advanced, mixed technology process that combines precision bipolar circuits with low power CMOS logic. LOGDAC is a registered trademark of Analog Devices, Inc. PRODUCT HIGHLIGHTS 1. Wide Dynamic Range: 0 dB to 88.5 dB attenuation range in 0.375 dB steps. 2. Small Package: The AD7111/AD7111A are available in 16-pin DIPs and SOIC packages. 3. Transparent Latch Operation: By tying the CS and WR in- puts low, the DAC latches in the AD7111A can be made transparent. 4. Fast Microprocessor Interface: Data setup times of 25 ns and write pulse width of 57 ns make the AD7111A compatible with modern microprocessors. |
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