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MP7628JN Datasheet(PDF) 1 Page - Exar Corporation |
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MP7628JN Datasheet(HTML) 1 Page - Exar Corporation |
1 / 12 page MP7628 1 Rev. 2.00 FEATURES • Readback Capability for all DACs • On-Chip Latches for All DACs • Linearity Grades to +1/8 LSB • Single Supply Voltage (5 Volt) • DACs Matched to 1% • Four Quadrant Multiplication • Microprocessor TTL/CMOS Compatible • Latch-Up Free • Dual Version: MP7529B 5 V CMOS Quad Multiplying 8-Bit Digital-to-Analog Converter APPLICATIONS • Microprocessor Controlled Gain and Attenuation Circuits • Microprocessor Controlled/Programmable Power Supplies • Hardware Redundant Applications Requiring Data Readback GENERAL DESCRIPTION The MP7628 is a quad 8-bit Digital-to-Analog Converter de- signed using a decoded DAC architecture featuring excellent DAC-to-DAC matching and guaranteed monotonicity. Separate on-chip latches are provided for each DAC to allow easy microprocessor interface. The readback function allows the user to poll or read the data latches, eliminating the need for storing information in RAM. In the event the microprocessor power supply is interrupted, it can poll the DACs to establish the last known system state. Data is transferred into any of the four DAC data latches via common 8-bit TTL/CMOS compatible input port. Control inputs DS1, DS2 and A/B determine which DAC is to be loaded. The MP7628’s load cycle is similar to the write cycle of a random ac- cess memory and the device is bus compatible with most 8-bit microprocessors. The device operates at +5 V power supply and dissipates less than 5mW. All DACs offer excellent four quadrant multiplication charac- teristics with a separate reference input and feedback resistor for each DAC. THREE-STATE BUFFER SIMPLIFIED BLOCK DIAGRAM THREE-STATE BUFFER LATCH A DAC A LATCH B DAC B THREE-STATE BUFFER LATCH C DAC C THREE-STATE BUFFER LATCH D DAC D BI- DIRECTIONAL LINE DRIVER CONTROL LOGIC DB0 (LSB) DATA BUS DB7 (MSB) GND VDD VREFB VREFA RFBA IOUT1A IOUT2A/ IOUT2B IOUT1B RFBB RFBC IOUT1C IOUT2C/ IOUT2D IOUT1D RFBD RFB VREFD VREFC RFB RFB RFB A/B R/W DS1 DS2 |
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