參數(shù)資料
型號(hào): AD7741
廠商: Analog Devices, Inc.
英文描述: Low Cost, Single & Multi-Channel,Voltage-to-Frequency Converters(低成本,單通道,電壓-頻率轉(zhuǎn)換器)
中文描述: 低成本,單
文件頁(yè)數(shù): 8/9頁(yè)
文件大?。?/td> 304K
代理商: AD7741
AD7741/42
Prelim J1 7/98
8
Preliminary Technical Data
PRELMNARY
(
)
Figure 3. AD7742 Transfer Characteristic for Bipolar Differ-
ential Input Range: -REF IN/Gain to +REF IN/Gain (the
Common Mode Range is from -300mV to V
DD
- 2 V). UNI/
BIP
pin tied to GND.
Figure 2. AD7742 Transfer Characteristic for Unipolar Dif-
ferential input range: 0 V to REF IN/Gain; the input Com-
mon Mode Range must be between -300mV and V
DD
-2V.
UNI/
BIP
pin tied to V
DD
.
Figure 1. AD7741 Transfer Characteristic for Input Range
from 0 V to REF IN.
TABLE I. AD7742 INPUT CHANNEL SELECTION
A1
A0
IN(+)
IN(-)
TYPE
0
0
1
1
0
1
0
1
IN1
IN2
IN3
IN1
IN4
IN4
IN4
IN2
Pseudo Diff
Pseudo Diff
Full Diff
Full Diff
TABLE II. AD7742 GAIN SETTING SELECTION
UNI/
BIP
G0
Gain
Setting, G Voltage Span (REF IN =2.5V)
Differential Input
1
1
0
0
0
1
0
1
X1
X2
X1
X2
0 to +2.5 V
0 to +1.25 V
-2.5 to +2.5 V
-1.25 to +1.25 V
0 to +REF IN/Gain
0 to +REF IN/Gain
-REF IN/Gain to +REF IN/Gain
-REF IN/Gain to +REF IN/Gain
0
REF IN
GAIN
(
DIFFERENTIAL
INPU T VOLTAGE
OUTPUT
FREQUENCY
FOU T
)
FOUT MIN
(0.05 FCLOCK)
FOUT MAX
(0.45 FCLOCK)
REF IN
G AIN
+
DIFFER EN TIA L
INPU T V OLTAG E
OU TPU T
FR EQU EN CY
FOU T
R EF IN
GAIN
(
)
-
FOU T M IN
(0.0 5 FCLO CK)
FOU T M AX
(0.4 5 FCLO CK)
0
VIN
OUTPUT
FREQUENCY
FOUT
FOUT MIN
(0.05 FCLOCK)
FOUT MAX
(0.45 FCLOCK)
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