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ADC674ASH Datasheet(PDF) 4 Page - Burr-Brown (TI)

[Old version datasheet] Texas Instruments acquired Burr-Brown Corporation.
No. de pieza ADC674ASH
Descripción Electrónicos  Microprocessor-Compatible ANALOG-TO-DIGITAL CONVERTER
Download  6 Pages
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Fabricante Electrónico  BURR-BROWN [Burr-Brown (TI)]
Página de inicio  http://www.burr-brown.com
Logo BURR-BROWN - Burr-Brown (TI)

ADC674ASH Datasheet(HTML) 4 Page - Burr-Brown (TI)

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4
®
ADC674A
PIN CONFIGURATION
PIN
DESIGNATION
DEFINITION
FUNCTION
CE (Pin 6)
Chip Enable
Must be high (“1”) to either initiate a conversion or read output data. 0-1 edge may be used to initiate a
(active high)
conversion.
CS (Pin 3)
Chip Select
Must be low (“0”) ot either initiate a conversion or read output data. 1-0 edge may be used to initiate a conversion.
(active low)
R/C (Pin 5)
Read/Convert
Must be low (“0”) to initiate either 8- or 12-bit conversions. 1-0 edge may be used to initiate a conversion. Must be high
(“1” = read)
(“1”) to read output data. 0-1 edge may be used to initiate a read operation.
(“0” = convert)
AO (Pin 4)
Byte Address
In the start-convert mode, AO selects 8-bit (A O = “1”) or 12-bit (AO = “0”) conversion mode. When reading output
Short Cycle
data in two 8-bit bytes, AO = “0” accesses ±8MSBs (high byte) and AO = “1” accesses 4LSBs and trailing “0s” (low
byte).
12/8 (Pin 2)
Data Mode Select
When reading output data. 12/8 = “1” enables all 12 output bits simultaneously. 12/8 = “0” will enable the MSBs
(“1” = 12-bits)
or LSBs as determined by the AO line.
(“0” = 8-bits)
TABLE I. ADC674A Control Line Functions.
CONTROLLING THE ADC674A
The Burr-Brown ADC674A can be easily interfaced to most
microprocessor systems and other digital systems. The mi-
croprocessor may take full control of each conversion, or the
converter may operate in a stand-alone mode, controlled
only by the R/C input. Full control consists of selecting an
8- or 112-bit conversion cycle, initiating the conversion, and
the output data when ready—choosing either 12 bits all at
once, or 8 bits followed by 4 bits in a left-justified format.
The five control inputs (12/8, CS, A
O, R/C, and CE) are all
TTL-/CMOS-compatible. The functions of the control in-
puts are described in Table I. The control function truth table
is listed in Table II.
CE
CS
R/C
12/8
AO
OPERATION
0
X
X
X
X
None
X
1
X
X
X
None
0
0
X
0
Initiate 12-bit conversion
0
0
X
1
Initiate 8-bit conversion
1
0
X
0
Initiate 12-bit conversion
1
0
X
1
Initiate 8-bit conversion
10
X
0
Initiate 12-bit conversion
10
X
1
Initiate 8-bit conversion
1
0
1
1
X
Enable 12-bit output
1
0
1
0
0
Enable 8 MSBs only
1
0
1
0
1
Enable 4 LSBs plus 4
trailing zeros
TABLE II. Control Input Truth Table.
+5VDC Supply (V
)
12/8
CS
A
R/C
CE
+V
Ref Out
Analog Common
Ref In
V
Bipolar Offset
10V Range
20V Range
Status
DB11 (MSB)
DB10
DB9
DB8
DB7
DB6
DB5
DB4
DB3
DB2
DB1
DB0 (LSB)
Digital Common
1
2
3
4
5
6
7
8
9
10
11
12
13
14
28
27
26
25
24
23
22
21
20
19
18
17
16
15
LOGIC
CC
EE
5k
10k
10V
Reference
12-Bit
D/A
Converter
Control
Logic
Power-up Reset
Clock
12 Bits
Comparator
12 Bits
O
5k


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