Datasheet

AD652
Rev. C | Page 19 of 28
00798-026
–V
S
V
IN2
φ 2
+V
S
0.02µF
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
AD652
SYNCHRONOUS
VOLTAGE-TO-
FREQUENCY
CONVERTER
15pF
–V
S
V
IN3
φ 3
+V
S
0.02µF
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
AD652
SYNCHRONOUS
VOLTAGE-TO-
FREQUENCY
CONVERTER
15pF
–V
S
V
IN4
φ 4
+V
S
0.02µF
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
AD652
SYNCHRONOUS
VOLTAGE-TO-
FREQUENCY
CONVERTER
15pF
MULTIPLEX
OUT
1 14
2 13
3 12
4 11
5 10
6 9
7 8
QQ
ONE SHOT
'121
φ 1
150Ω
1500pF
GND
NC
R
INT
C
EXT
R
EXT
/C
EXT
NC
NC
V
CC
Q
A2
A1
NC
18pF
10kΩ
2N2222
500Ω
+5V
2kΩ
50pF
+5V
1 20
2 19
3 18
4 17
5 16
6 15
7 14
8 13
9 12
10 11
φ 4
7.4µH
L = 41 TURNS
T50–7 CORE
MICROMETALS
C = 300pF
φ 3
φ 1
+5V
+5V
3.2768MHz
CRYSTAL
+5V
φ 2
1kΩ
TANK 1
TIM 9904A
TANK 2 XTAL 2
XTAL 4
FFQ OSCIN
FFD
OSCOUT
φ 4 TTL
φ 2 TTL
φ 3 TTL
φ 1 TTL
φ 3V
DD
φ 4 φ 1 φ 2
GND 1
GND 2
V
CC
Figure 26. SVFC Multiplexer
00798-027
INPUT B
GND
75Ω
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
INPUTS A
FROM
ENCODER
MPX
INPUT
+5V
A OUTPUTS
ENABLE
B OUTPUTS
D OUTPUTS
C OUTPUTS
ENABLE
INPUTS D
INPUT C
500 FEET
BELDEN 9272
78Ω SHIELDED PAIR
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
INPUTS A
+5V
MPX OUTPUT
TO DECODER
AM26LS33
QUAD DIFFERENTIAL LINE RECEIVER
AM26LS31
QUAD HIGH SPEED DIFFERENTIAL LINE RECEIVER
OUTPUT A
OUTPUT C
ENABLE
INPUTS C
INPUTS B
INPUTS D
ENABLE
INPUT D
OUTPUT B
Figure 27. RS-422 Standard Data Transmission