ADC574ASH BURR-BROWN [Burr-Brown Corporation], ADC574ASH Datasheet - Page 10

• Manufacturer Part Number: ADC574ASH
• Description: Microprocessor-Compatible ANALOG-TO-DIGITAL CONVERTER
• Manufacturer: BURR-BROWN [Burr-Brown Corporation]

When A
When A
from the conversion followed by four logic zeros which
have been forced by the control logic. The left-justified
formats of the two 8-bit bytes are shown in Figure 8. The
design of the ADC574A guarantees that the A
toggled at any time with no damage to the converter; the
outputs which are tied together as illustrated in Figure 9
cannot be enabled at the same time.
FIGURE 8. 12-Bit Data Format for 8-Bit Systems.
FIGURE 9. Connection to an 8-Bit Bus.
Processor
Converter
O
O
is low, the byte addressed contains the 8MSBs.
is high, the byte addressed contains the 4LSBs
Address
Bus
®
A
DB11 DB10
DB7
O
ADC574A
DB6
DB5
DB9
Word 1
DB4
DB8
2
4
12/8
A
DB3
DB7
O
O
input may be
DB2
DB6
ADC574A
Digital Common
DB1
DB5
DB11 (MSB)
DB0 (LSB)
STATUS
10
DB0
DB4
In the majority of applications the read operation will be
attempted only after the conversion is complete and the
STATUS output has gone low. In those situations requiring
the earliest possible access to the data, the read may be
started as much as 1.15 s (t
STATUS goes low. Refer to Figure 7 for these timing
relationships.
28
27
26
25
24
23
22
21
20
19
18
17
16
15
DB7
DB3
DB2
DB6
DB5
DB1
DB4
DB0
Word 2
DD
DB3
0
max + t
DB2
0
Data
Bus
HS
DB1
0
min) before
DB0
0