CMOS 10-Bit Monolithic A/D Converter
r. ANALOG
8 L.III DEVICES
CMOS 10-BitMonolithiAc ID Converter
FEATURES 8- and 10-Bit Resolution
20llS Conversion Time...
Description
r. ANALOG
8 L.III DEVICES
CMOS 10-BitMonolithiAc ID Converter
FEATURES 8- and 10-Bit Resolution
20llS Conversion Time
Microprocessor Compatibility
Very Low Power Dissipation
Parallel and Serial Outputs
Ratiometric Operation
TTL/DTL/CMOS Logic Compatibility
CMOS Monolithic Construction
O8 BGENERAL DESCRIPTION SThe AD7570 is a monolithic CMOS 10-bit successive approxi-
mation AID converter on a 120 by 13 5 mil chip, requiring
Oonly an external comparator, reference and passive clocking
components. Ratiometric operation is inherent, since an ex-
8 Ltremely accurate multiplying DAC is used in the feedback loop. EThe AD7570 parallel output data lines and Busy line utilize Tthree-state logic to permit bussing with other AID output and Econtrol lines or with other I/O interface circuitry. Two enables
FUNCTIONAL DIAGRAM
OUT1
OUT2
AIN VREF
I
I
10
,..,....--0 DB9 (MSB) DB8
are available: one controls the two MSBs; the second controls
18 DB1
the remaining 8 LSBs. This feature provides the control interface for most microprocessors which can accept only an 8-bit byte.
The AD7570 also provides a serial data output line to be used
in conjunction with the serial synchronization line. The clock
CaMP
8 can be driven externally or, with the addition of a resistor and a capacitor, can run internally as high as 0.6MHz allowing a
STRT
total conversion time (8 bits) of typically 201ls. An 8-bit short
ClK
cycle control pin stops the clock after exercising 8 bits, nor-
mal...
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