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參數(shù)資料
| 型號： | AD774BJNZ |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 9/12頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC ADC 12BIT W/BUFF REF 28DIP |
| 標(biāo)準(zhǔn)包裝： | 13 |
| 位數(shù)： | 12 |
| 采樣率（每秒）： | 125k |
| 數(shù)據(jù)接口： | 并聯(lián) |
| 轉(zhuǎn)換器數(shù)目： | 1 |
| 功率耗散（最大）： | 375mW |
| 電壓電源： | 雙 ± |
| 工作溫度： | 0°C ~ 70°C |
| 安裝類型： | 通孔 |
| 封裝/外殼： | 28-DIP（0.600"，15.24mm） |
| 供應(yīng)商設(shè)備封裝： | 28-PDIP |
| 包裝： | 管件 |
| 輸入數(shù)目和類型： | 2 個單端，單極；2 個單端，雙極 |
REV. C
–6–
AD674B/AD774B
PIN FUNCTION DESCRIPTIONS
Symbol
Pin No.
Type
* Name and Function
AGND
9
P
Analog Ground (Common)
A0
4
DI
Byte Address/Short Cycle. If a conversion is started with A0 Active LOW, a full 12-bit conversion
cycle is initiated. If A0 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 A0 = HIGH enables DB3–DB0 and sets DB7–DB4 = 0.
BIP OFF
12
AI
Bipolar Offset. Connect through a 50
resistor to REF OUT for bipolar operation or to Analog
Common for unipolar operation.
CE
6
DI
Chip Enable. Chip Enable is Active HIGH and is used to initiate a convert or read operation.
CS
3
DI
Chip Select. Chip Select is Active LOW.
DB11–DB8 27–24
DO
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 A0 is LOW and are
disabled when A0 is HIGH.
DB7–DB4
23–20
DO
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 A0 is LOW and all zeroes when A0 is HIGH.
DB3–DB0
19–16
DO
Data Bits 3 through 0. In both the 12-bit and 8-bit format these pins provide the lower 4 bits of
data when A0 is HIGH; they are disabled when A0 is LOW.
DGND
15
P
Digital Ground (Common)
REF OUT
8
AO
10 V Reference Output
R/
C
5
DI
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.
REF IN
10
AI
Reference Input is connected through a 50
resistor to +10 V Reference for normal operation.
STS
28
DO
Status is Active HIGH when a conversion is in progress and goes LOW when the conversion is
completed.
VCC
7
P
+12 V/+15 V Analog Supply
VEE
11
P
–12 V/–15 V Analog Supply
VLOGIC
1
P
5 V Logic Supply
10 VIN
13
AI
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 VIN should not be connected.
20 VIN
14
AI
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 VIN should not be connected.
12/
8
2
DI
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).
*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
VLOGIC
12/
8
CS
A0
R/
C
CE
VCC
REF OUT
AGND
REF IN
VEE
BIP OFF
10 VIN
20 VIN
STS
DB11 (MSB)
DB10
DB9
DB8
DB7
DB6
DB5
DB4
DB3
DB2
DB1
DB0 (LSB)
DGND
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