AD652BQ/+ Analog Devices Inc, AD652BQ/+ Datasheet - Page 17

• Manufacturer Part Number: AD652BQ/+
• Description: IC V-F CONV SYNCH MONO 5V 16CDIP
• Manufacturer: Analog Devices Inc
• Type: Voltage to Frequencyr

Specifications of AD652BQ/+

• Rohs Status: RoHS non-compliant
• Frequency - Max: 2MHz
• Full Scale: ±25ppm/°C
• Linearity: ±0.005%
• Mounting Type: Through Hole
• Package / Case: 16-CDIP (0.300", 7.62mm)

FREQUENCY OUTPUT MULTIPLIER
The AD652 can serve as a frequency output multiplier when
used in conjunction with a standard voltage-to-frequency
converter. Figure 23 shows the low cost AD654 VFC being used
as the clock input to the AD652. Also shown is a second AD652
in the F/V mode. The AD654 is set up to produce an output
frequency of 0 kHz to 500 kHz for an input voltage (V
of 0 V to 10 V. The use of R4, C1, and the XOR gate doubles this
output frequency from 0 kHz–500 kHz to 0 MHz–1 MHz.
0V–10V
0V–10V
V
OUT
V1
V2
8.06kΩ
–
+
R1
0.02µF
400pF
+15V
–15V
+15V
–15V
2kΩ
R2
R3
1kΩ
1
2
3
4
5
6
7
8
1
2
3
4
5
6
7
8
R
1kΩ
4
3
20kΩ
20kΩ
T
Figure 23. Frequency Output Multiplier
SYNCHRONOUS
SYNCHRONOUS
1
VOLTAGE-TO-
VOLTAGE-TO-
FREQUENCY
CONVERTER
FREQUENCY
CONVERTER
) range
AD654
AD652
AD652
1mA
1mA
5
Rev. C | Page 17 of 28
200pF
OSC/DRIVER
6
REFERENCE
REFERENCE
200pF
AND
AND
C
8
T
5V
5V
This 1 MHz full-scale frequency is then used as the clock input
to the AD652 SVFC. Because the AD652 full-scale output
frequency is one-half the clock frequency, the 1 MHz FS clock
frequency establishes a 500 kHz maximum output frequency for
the AD652 when its input voltage (V
fore has an output frequency range from 0 kHz to 500 kHz,
which is proportional to the product of V
7
D
D
SHOT
SHOT
ONE
ONE
Q
Q
Q
Q
FLOP
FLOP
"D"
"D"
CK
CK
1
2
+5V
500pF
16
15
14
13
12
11
10
16
15
14
13
12
11
10
9
9
1kΩ
C1
R
2.87kΩ
+5V
PU
2kΩ
1MHz
CLOCK
INPUT
A
B
+5V
74LS86
f
C
f
C
OUT
2
) is 10 V. The user there-
1
and V
2
.
AD652