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6. Digital filter : SMS804B
(X25-2860-11 : lC4)
6-1. Block diagram
x I
XT
;-T
cKo
CKSL
lssf
scsL
Table 6-1
g l E l g l f l r a c
o
O
O
@
o
o
o
o
N
o
5
x
"0L
iq.nf
tii':::
'B;:t
5-2. Explanation of terminals
Terminal No. Terminal name
Function
Terminal No.
Terminal name
Function
1
-Vcc
A n a l o g n e g a t i v e p o w e r s u p p l y .
I
Vout
V o l t a g e o u t p u t
2 '
D I G G N D
D i g i t a l g r o u n d .
1 0
H F
Feedback resistor.
+ V L
L o g i c p o s i t i v e p o w e r s u p p l y .
t l
e l
Summing junction (op amp. input)
N C
N o c o n n e c t i o n .
1 2
A N A G N D
A n a l o g g r o u n d .
C K
C l o c k i n p u t .
I J
I out
Current output.
6
L E C
L a t c h e n a b l e c o n t r o l i n o u t .
l 4
MSB ADJ
M S B a d j u s t m e n t t e r m i n a l .
DATA
D a t a i n p u t .
t c
V POT
Potentiometer terminal.
I
Logic negative power supply
t o
* Vcc
Analog positive power supply.
Table 5-1
FlESletBlfitfitEc
M u ! t i p l e x e r / A c c u m u l a t o r
{ 1 6 x 1 8 b i t / 2 5 b i t l
Outpur lslch/Output timin€ CCT.
6-2. Explanation of terminals
Terminal
N o .
r
erminal
name
alo
Function
S-two
S e r i a l i n p u t m o d e s e l e c t .
S I E B
B c h s e r i a l i n o u t e n a b l e . r
siEa
, A c h s e r i a l i n p u t e n a b l e . '
A
B C K I
I
S e r i a l i n p u t b i t - c l o c k i n p u t .
5
S I D
I
S e r i a l i n p u t d a t a
1 1
C K S L
I
ERSI = "H" for external clock inout.
1 2
Vss
GND power supply terminal (0V).
XT
Clock input when e KSf = "H"
1 8
P O M D
P O M D = " L " f o r i n - p h a s e p a r a l l e l o u t p u t m o d e
1 9
S O M D
SOMD = " L" during serial output.
t n
LSBO
27
SODA
o
A ch serial data outout.
28
S O D B
o
B c h s e r i a l d a t a o u t p u t .
30
B C K O
o
S e r i a l o u t p u t b i t - c l o c k o u t p u r .
co4
O
S e r i a l o u t p u t c o n t r o l c l o c k 4 .
44
FdST
FOS-L = "H" for serial outpur mooe.
4 5
Y O F B
TOFB="U" for 2's comptement display outpur
46
V D D
P o s i t i v e p o w e r s u p p l y t e r m i n a l ( + 5 V ) .
47
X O F B
XOFB = "H" for 2's complement display input.
48
P I S L
I
P I S L = " H " f o r s e r i a l i n p u t m o d e .
60
L S B I
I
L S B I =
" H "
f o r M S B - f i r s t s e r i a l i n p u t .
1 3
F i s . 6 - 1
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