Product Summary

The AD7581CQ is a microprocessor compatible 8 bit, 8 channel, memory buffered, data-acquisition system on a monolithic CMOS chip. The AD7581CQ consists of an 8 bit successive approximation A/D converter, an 8 channel multiplexer, 8×8 dual-port RAM, three-state DATA drivers (for interface), address latches and microprocessor compatible control logic. The device interfaces directly to 8080, 8050, Z80, 6800 and other microprocessor systems. The successive approximation conversion takes place on a continuous, channel sequencing, base using microprocessor control signals for the clock. Data is automatically transferred to its proper location in the AD7581CQ at the end of each conversion.

Parametrics

AD7581CQ absolute maximum ratings: (1)VDD to AGND: +7V; (2)VDD to DGND: +7V; (3)AGND to DGND: -0.3V, VDD; (4)Digital input voltage to DGND: -0.3V, VDD +0.3V; (5)Digital output voltage to DGND: -0.3V, VDD +0.3V; (6)CLK input voltge to DGND: -0.3V, VDD +0.3V; (7)VREF to AGND: ±25V; (8)VBOFS to AGND: ±17V; (9)AIN: ±17V; (10)Operating temperature range, commercial: 0 to +70℃; Industrial: -25℃ to +85℃; (11)Storage temperature: -65℃ to +150℃; (12)Lead temperature: +300℃; (13)Power dissipation to +75℃: 1000mW; derate above +75℃ by: 10mW/℃.

Features

AD7581CQ features: (1)8-bit resolution; (2)On-chip 8×8 dual-port memory; (3)No missed codes over full temperature range; (4)Interfaces directly to Z80/8085/6800; (5)CMOS, TTL compatible digital inputs; (6)Three-state data drivers; (7)Ratiometric capability; (8)Interleaved DMA operation; (9)Fast conversion; (10)A/D process totally transparent to μP; (11)Low cost.

Diagrams

AD7581CQ block diagram

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