Datasheet

AD7524
REV. B
–5–
ANALOG CIRCUIT CONNECTIONS
Figure 4. Unipolar Binary Operation
(2-Quadrant Multiplication)
Table I. Unipolar Binary Code Table
Digital Input
MSB LSB Analog Output
1111 1111 –V
REF
(255/256)
1000 0001 –V
REF
(129/256)
1000 0000 –V
REF
(128/256) = –V
REF
/2
0111 1111 –V
REF
(127/256)
0000 0001 –V
REF
(1/256)
0000 0000 –V
REF
(0/256) = 0
Note: 1 LSB = (2
–8
)(V
REF
) = 1/256 (V
REF
)
MICROPROCESSOR INTERFACE
Figure 6. AD7524/8085A Interface
Figure 5. Bipolar (4-Quadrant) Operation
Table II. Bipolar (Offset Binary) Code Table
Digital Input
MSB LSB Analog Output
1111 1111 +V
REF
(127/128)
1000 0001 +V
REF
(1/128 )
1000 0000 0
0111 1111 –V
REF
(1/128)
0000 0001 –V
REF
(127/128)
0000 0000 –V
REF
(128/128)
Note: 1 LSB = (2
–7
)(V
REF
) = 1/128 (V
REF
)
Figure 7. AD7524/MC6800 Interface
AD7524
AD7524