Sam4s ER-390 SERIES Service Manual page 34

6 Reference Information
6-1 Semiconductor Base Diagram
6-1-4 Other ICs
Refer to page 12 for package dimensions.
Pin Description
Pin No. Pin Name
1/2 Xin / Xout
7/3 S0 / S1
4
6 FSOUT
8 VDD
5 VSS
Output Frequency Selection
Product Number
FS781
FS782
FS784
LOAD
V
1
BB
SUPPLY
SERIAL
2
DATA O UT
OUT
3 2
20
OUT
4
19
OUT
5
18
OUT
6
17
OUT
16 7
OUT
8
15
OUT
14 9
OUT
10
13
OUT
11
12
OUT
12
11
BLANKING BLNK
13
GROUND 14
6-6
Xin 1 8
Xout 2 7
FS78x
S1 3 6
LF 4 5
8 Pin SOIC Package
I/O TYPE
I/O Analog
I CMOS/TTL
LF I Analog
O CMOS/TTL
P Power
P Power
FSOUT Frequency Scaling
Table 2. FSOUT SSCG (Modulated Output Clock) Product Selection
Figure 6-11 SSCG FS781 Specification
LOGIC
V
28
DD SUPPLY
SERIAL
27
DATA I N
OUT
6
1
OUT
25
2
OUT
24
3
OUT
23
4
OUT
22
5
OUT
21
6
OUT
20
7
OUT
19
8
18 OUT
9
OUT
17
10
STROBE
ST 16 28
CLOCK
CLK 27 15
Figure 6-12 VFD Driver UCN5812 Specification
VDD S0
S0
VDD
FSOUT
Xin
VSS
Xout
8 Pin TSSOP Package
Pins form an on-chip reference oscillator when connected to
terminals of an external parallel resonant crystal. Xin may be
connected to TTL/CMOS external clock source.
connected to external clock other than crystal, leave Xout (pin 2)
unconnected.
Digital control inputs to select input frequency range and output
frequency scaling. Refer to Tables 7 & 8 for selection. S0 has
internal pulldown. S1 has internal pullup.
Loop Filter. Single ended tri-state output of the phase detector. A
two-pole passive loop filter is connected to Loop Filter (LF).
Modulated Clock Frequency Output. The center frequency is the
same as the input reference frequency for FS781. Input
frequency is multiplied by 2x and 4x for FS782 and FS784
respectively.
Positive Power Supply.
Power Supply Ground
Table 1
1x 1x Modulated Frequency of Input Clock
2x 2x Modulated Frequency of Input Clock
4x 4x Modulated Frequency of Input Clock
CLOCK
SERIAL
SERIAL-PARALLEL S HIFT REGISTER
DATA I N
STROBE
BLANKING
GROUND OUT OUT OUT
1 2
1 8 FSOUT
2 7 VSS
FS78x
3 6 LF
4 5 S1
Description
Description
LATCHES
MOS
BIPOLAR
OUT
3 N
SAM4S ER-390 SERIES
If Xin
LOGIC
V
DD
SUPPLY
SERIAL
DATA O UT
LOAD
V
BB
SUPPLY
D wg . FP -013-1