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AD652JPZ-REEL 数据表(PDF) 9 Page - Analog Devices

部件名 AD652JPZ-REEL
功能描述  Monolithic Synchronous Voltage-to-Frequency Converter
Download  28 Pages
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制造商  AD [Analog Devices]
网页  http://www.analog.com
标志 AD - Analog Devices

AD652JPZ-REEL 数据表(HTML) 9 Page - Analog Devices

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AD652
Rev. C | Page 9 of 28
SVFC CONNECTION FOR DUAL SUPPLY, POSITIVE
INPUT VOLTAGES
Figure 8 shows the AD652 connection scheme for the
traditional dual supply, positive input mode of operation. The
±VS range is from ±6 V to ±18 V. When +VS is lower than 9.0 V,
As shown in Figure 8, three additional connections are required
The first connection is to short Pin 13 to Pin 8 (Analog Ground
to −VS) and add a pull-up resistor to +VS (as shown in
Figure 21). The pull-up resistor is determined by the following
equation:
µA
500
V
5
2
=
S
PULLUP
V
R
These connections ensure proper operation of the 5 V reference.
Tie Pin 16 to Pin 6 (as shown in Figure 21) to ensure that the
integrator output ramps down far enough to trip the
comparator.
The CERDIP-packaged AD652 accepts either a 0 V to 10 V or
0 mA to 0.5 mA full-scale input signal. The temperature drift of
the AD652 is specified for a 0 V to 10 V input range using the
internal 20 kΩ resistor. If a current input is used, the gain drift is
degraded by a maximum of 100 ppm/°C (the TC of the 20 kΩ
resistor). If an external resistor is connected to Pin 5 to establish
a different input voltage range, drift is induced to the extent that
the external resistor’s TC differs from the TC of the internal
resistor. The external resistor used to establish a different input
voltage range should be selected to provide a full-scale current
of 0.5 mA (i.e., 10 kΩ for 0 V to 5 V).
SVFC CONNECTIONS FOR NEGATIVE INPUT
VOLTAGES
Voltages that are negative with respect to ground may be used
as the input to the AD652 SVFC. In this case, Pin 7 is grounded
and the input voltage is applied to Pin 6 (see Figure 9). In this
mode, the input voltage can go as low as 4 V above −VS. In this
configuration, the input is a high impedance, and only the
20 nA (typical) input bias current of the op amp must be
supplied by the input signal. This is contrasted with the more
usual positive input voltage configuration, which has a 20 kΩ
input impedance and requires 0.5 mA from the signal source.
+VS
1
2
3
4
+
5
6
7
+VS
VIN
8
16
15
14
13
12
11
10
9
ONE
SHOT
AND
"D"
FLOP
QCK
D
Q
1mA
20k
AD652
SYNCHRONOUS
VOLTAGE-TO-
FREQUENCY
CONVERTER
5V
REFERENCE
RL
5V
CLOCK
ANALOG
GND
DIGITAL
GND
FREQ
OUT
CINT
–VS
Figure 8. Standard V/F Connection for Positive Input Voltage with Dual Supply
+VS
1
2
3
4
5
6
7
+VS
–VS
8
16
15
14
13
12
11
10
9
ONE
SHOT
AND
"D"
FLOP
QCK
D
Q
1mA
20k
AD652
SYNCHRONOUS
VOLTAGE-TO-
FREQUENCY
CONVERTER
5V
REFERENCE
RL
5V
CLOCK
ANALOG
GND
DIGITAL
GND
FREQ
OUT
CINT
+
VIN
Figure 9. Negative Voltage Input


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