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參數(shù)資料
| 型號： | AD774BAR |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | ADC |
| 英文描述： | Complete 12-Bit A/D Converters |
| 中文描述： | 1-CH 12-BIT SUCCESSIVE APPROXIMATION ADC, PARALLEL ACCESS, PDSO28 |
| 封裝： | PLASTIC, SOIC-28 |
| 文件頁數(shù)： | 6/12頁 |
| 文件大?。?/td> | 247K |
| 代理商： | AD774BAR |
REV. C
–6–
AD674B/AD774B
PIN FUNCTION DESCRIPTIONS
Symbol
Pin No. Type
*
Name and Function
AGND
A
0
9 P
4 DI
Analog Ground (Common)
Byte Address/Short Cycle. If a conversion is started with A
0
Active LOW, a full 12-bit conversion
cycle is initiated. If A
0
is Active HIGH during a convert start, a shorter 8-bit conversion cycle
results. During Read (R/
C
= 1) with 12/
8
LOW, A
0
= LOW enables the 8 most significant bits,
and A
0
= HIGH enables DB3
–
DB0 and sets DB7
–
DB4 = 0.
Bipolar Offset. Connect through a 50
resistor to REF OUT for bipolar operation or to Analog
Common for unipolar operation.
Chip Enable. Chip Enable is Active HIGH and is used to initiate a convert or read operation.
Chip Select. Chip Select is Active LOW.
Data Bits 11 through 8. In the 12-bit format (see 12/
8
and A
0
pins) these pins provide the upper
4 bits of data. In the 8-bit format, they provide the upper 4 bits when A
0
is LOW and are
disabled when A
0
is HIGH.
Data Bits 7 through 4. In the 12-bit format these pins provide the middle 4 bits of data. In the
8-bit format they provide the middle 4 bits when A
0
is LOW and all zeroes when A
0
is HIGH.
Data Bits 3 through 0. In both the 12-bit and 8-bit format these pins provide the lower 4 bits of
data when A
0
is HIGH; they are disabled when A
0
is LOW.
Digital Ground (Common)
10 V Reference Output
Read/Convert. In the full control mode R/
C
is Active HIGH for a read operation and Active LOW
for a convert operation. In the standalone mode, the falling edge of R/
C
initiates a conversion.
Reference Input is connected through a 50
resistor to +10 V Reference for normal operation.
Status is Active HIGH when a conversion is in progress and goes LOW when the conversion is
completed.
+12 V/+15 V Analog Supply
–
12 V/
–
15 V Analog Supply
5 V Logic Supply
10 V Span Input, 0 V to +10 V unipolar mode or
–
5 V to +5 V bipolar mode. When using the
20 V Span, 10 V
IN
should not be connected.
20 V Span Input, 0 V to +20 V unipolar mode or
–
10 V to +10 V bipolar mode. When using the
10 V Span, 20 V
IN
should not be connected.
The 12/
8
pin determines whether the digital output data is to be organized as two 8-bit words
(12/
8
LOW) or a single 12-bit word (12/
8
HIGH).
BIP OFF
12 AI
CE
CS
DB11
–
DB8 27
–
24 DO
6 DI
3 DI
DB7
–
DB4
23
–
20 DO
DB3
–
DB0
19
–
16 DO
DGND
REF OUT
R/
C
15 P
8 AO
5 DI
REF IN
STS
10 AI
28 DO
V
CC
V
EE
V
LOGIC
10 V
IN
7 P
11 P
1 P
13 AI
20 V
IN
14 AI
12/
8
2 DI
*
Types: AI = Analog Input, AO = Analog Output, DI = Digital Input, DO = Digital Output, P = Power
PIN CONFIGURATION
TOP VIEW
(Not to Scale)
28
27
26
25
24
23
22
21
20
19
18
17
16
15
1
2
3
4
5
6
7
8
9
10
11
12
13
14
AD674B
OR
AD774B
V
LOGIC
12/
8
CS
A
0
R/
C
CE
V
CC
REF OUT
AGND
REF IN
V
EE
BIP OFF
10 V
IN
20 V
IN
STS
DB11 (MSB)
DB10
DB9
DB8
DB7
DB6
DB5
DB4
DB3
DB2
DB1
DB0 (LSB)
DGND
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| AD774BBR | Complete 12-Bit A/D Converters |
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