AD650 Analog Devices, Inc., AD650 Datasheet - Page 6

• Manufacturer Part Number: AD650
• Description: Voltage-to-frequency And Frequency-to-voltage Converter
• Manufacturer: Analog Devices, Inc.

AD650
PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS
Table 2. Pin Function Descriptions
D-14, N-14
1
2
3
4
5
6
7
8
9
10
11
12
13, 14
BIBOLAR OFFSET
Pin No.
CAPACITOR
ONE SHOT
Figure 2. D-14, N-14 Pin Configurations
CURRENT
P-20A
2
3
4
6
8
9
1, 5, 7, 10, 11, 15, 17
12
13
14
16
18
19, 20
V
OUT
–V
+IN
–IN
NC
S
1
2
3
4
5
6
7
NC = NO CONNECT
(Not to Scale)
TOP VIEW
AD650
Mnemonic
V
+IN
–IN
BIPOLAR OFFSET
CURRENT
–V
ONE-SHOT
CAPACITOR
NC
F
COMPARATOR INPUT
DIGITAL GND
ANALOG GND
+V
OFFSET NULL
14
13
12
11
10
OUTPUT
OUT
9
8
S
S
OFFSET NULL
OFFSET NULL
+V
ANALOG GND
DIGITAL GND
COMPARATOR
INPUT
F
OUTPUT
S
Rev. D | Page 6 of 20
Description
Output of Operational Amplifier. The operational amplifier, along with C
is used in the integrate stage of the V to F conversion.
Positive Analog Input.
Negative Analog Input.
On-Chip Current Source. This can be used in conjunction with an external
resistor to remove the operational amplifier’s offset.
Negative Power Supply Input.
The Capacitor, C
for the one shot.
No Connect.
Frequency Output from AD650.
Input to Comparator. When the input voltage reaches −0.6 V, the one shot is
triggered.
Digital Ground.
Analog Ground.
Positive Power Supply Input.
Offset Null Pins. Using an external potentiometer, the offset of the
operational amplifier can be removed.
OS
NC = NO CONNECT
BIPOLAR OFFSET
, is Connected to This Pin. C
CURRENT
–V
–IN
NC
NC
Figure 3. P-20A Pin Configuration
S
4
5
6
7
8
3
9
(Not to scale)
PIN 1
INDENTFIER
TOP VIEW
AD650
10
2
11
1
OS
20
12
determines the time period
19
13
18
17
16
15
14
+V
NC
ANALOG GND
NC
DIGITAL GND
S
INT
,