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參數資料
| 型號： | AD7890SQ-2 |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | ADC |
| 英文描述： | 20 Characters x 4 Lines, 5x7 Dot Matrix Character and Cursor |
| 中文描述： | 8-CH 12-BIT PROPRIETARY METHOD ADC, SERIAL ACCESS, CDIP24 |
| 封裝： | 0.300 INCH, CERDIP-24 |
| 文件頁數： | 6/20頁 |
| 文件大小： | 302K |
| 代理商： | AD7890SQ-2 |
AD7890
–6–
REV. A
PIN CONFIGURAT ION
DIP and SOIC
AGND
SMODE
REF OUT/REF IN
V
IN8
CONVST
CLK IN
SCLK
V
IN5
V
IN4
V
IN3
V
IN2
DGND
C
EXT
V
IN7
V
IN6
TFS
RFS
V
IN1
DATA OUT
AGND
DATA IN
SHA IN
V
DD
MUX OUT
14
1
2
24
23
5
6
7
20
19
18
3
4
22
21
8
17
9
16
10
15
11
TOP VIEW
(Not to Scale)
12
13
AD7890
Pin
Mnemonic
Description
17
V
IN2
Analog Input Channel 2. Single-ended analog input. T he analog input range on is
±
10 V (AD7890-
10), 0 V to +4.096 V (AD7890-4) and 0 V to +2.5 V (AD7890-2). T he channel to be converted is
selected using the A0, A1 and A2 bits in the control register. T he multiplexer has guaranteed
break-before-make operation.
Analog Input Channel 3. Single-ended analog input. T he analog input range on is
±
10 V (AD7890-
10), 0 V to +4.096 V (AD7890-4) and 0 V to +2.5 V (AD7890-2). T he channel to be converted is
selected using the A0, A1 and A2 bits in the control register. T he multiplexer has guaranteed
break-before-make operation.
Analog Input Channel 4. Single-ended analog input. T he analog input range on is
±
10 V (AD7890-
10), 0 V to +4.096 V (AD7890-4) and 0 V to +2.5 V (AD7890-2). T he channel to be converted is
selected using the A0, A1 and A2 bits in the control register. T he multiplexer has guaranteed
break-before-make operation.
Analog Input Channel 5. Single-ended analog input. T he analog input range on is
±
10 V (AD7890-
10), 0 V to +4.096 V (AD7890-4) and 0 V to +2.5 V (AD7890-2). T he channel to be converted is
selected using the A0, A1 and A2 bits in the control register. T he multiplexer has guaranteed
break-before-make operation.
Analog Input Channel 6. Single-ended analog input. T he analog input range on is
±
10 V (AD7890-
10), 0 V to +4.096 V (AD7890-4) and 0 V to +2.5 V (AD7890-2). T he channel to be converted is
selected using the A0, A1 and A2 bits in the control register. T he multiplexer has guaranteed
break-before-make operation.
Analog Input Channel 7. Single-ended analog input. T he analog input range on is
±
10 V (AD7890-
10), 0 V to +4.096 V (AD7890-4) and 0 V to +2.5 V (AD7890-2). T he channel to be converted is
selected using the A0, A1 and A2 bits in the control register. T he multiplexer has guaranteed
break-before-make operation.
Analog Input Channel 8. Single-ended analog input. T he analog input range on is
±
10 V (AD7890-
10), 0 V to +4.096 V (AD7890-4) and 0 V to +2.5 V (AD7890-2). T he channel to be converted is
selected using the A0, A1 and A2 bits in the control register. T he multiplexer has guaranteed
break-before-make operation.
Voltage Reference Output/Input. T he part can be used with either its own internal reference or with
an external reference source. T he on-chip +2.5 V reference voltage is provided at this pin. When
using this internal reference as the reference source for the part, REF OUT should decoupled to
AGND with a 0.1
μ
F disc ceramic capacitor. T he output impedance of this reference source is typi-
cally 2 k
. When using an external reference source as the reference voltage for the part, the refer-
ence source should be connected to this pin. T his overdrives the internal reference and provides the
reference source for the part. T he REF IN input is buffered on-chip. T he nominal reference voltage
for correct operation of the AD7890 is +2.5 V.
18
V
IN3
19
V
IN4
20
V
IN5
21
V
IN6
22
V
IN7
23
V
IN8
24
REF OUT /REF IN
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