參數(shù)資料
型號： CAT512J-TE13
元件分類： 模擬信號調(diào)理
英文描述： SPECIALTY ANALOG CIRCUIT, PDSO14
封裝： SOIC-14
文件頁數(shù)： 8/10頁
文件大?。?/td> 71K
代理商： CAT512J-TE13
CAT512
7
Advanced Information
8/00
Figure 3. Temporary Change in Output
D0
D1
D2
D3
D4
D5
D6
D7
A0
A1
D0
D1
D2
D3
D4
D5
D6
D7
1
NEW DAC DATA
CURRENT DAC DATA
DO
DI
CS
PROG
DAC
OUTPUT
t
1
2
3
4
5
6
7
8
9
10
11
12
N
N+1 N+2
o
CURRENT
DAC VALUE
NON-VOLATILE
NEW
DAC VALUE
VOLATILE
CURRENT
DAC VALUE
NON-VOLATILE
RDY/BSY
setting is reloaded into the DAC control register. Since
this value is the same as that which had been there
previously no change in the DAC’s output is noticed.
Had the value held in the control register been different
from that stored in EEPROM then
a change would occur
at the read cycle’s conclusion.
TEMPORARILY CHANGE OUTPUT
The CAT512 allows temporary changes in DAC’s output
to be made without disturbing the settings retained in
EEPROM memory. This feature is particularly useful
when testing for a new output setting and allows for user
adjustment of preset or default values without losing the
original factory settings.
Figure 3 shows the control and data signals needed to
effect a temporary output change. DAC settings may be
changed as many times as required and can be made to
any of the two DACs in any order or sequence. The
temporary setting(s) remain in effect long as CS remains
high. When CS returns low all two DACs will return to the
output values stored in EEPROM memory.
When it is desired to save a new setting acquired using
this feature, the new value must be reloaded into the
DAC control register prior to programming. This is be-
cause the CAT512’s internal control circuitry discards
from the programming register the new data two clock
cycles after receiving it if no PROG signal is received.
Bipolar DAC Output
MSB
LSB
1111
—— (.98 V
) + .01 V
= .990 V
V
= +4.90V
1000
0000
—— (.98 V
) + .01 V
= .502 V
V
= +0.02V
0111
1111
—— (.98 V
) + .01 V
= .498 V
V
= -0.02V
0000
0001
—— (.98 V
) + .01 V
= .014 V
V
= -4.86V
0000
—— (.98 V
) + .01 V
= .010 V
V
= -4.90V
REF
IF
V
= 5V
REF
255
OUT
DAC INPUT
DAC OUTPUT
ANALOG
R = R
OUTPUT
REF
OUT
128
255
127
255
REF
OUT
1
255
REF
OUT
REF
OUT
0
255
V
= 0.99 V
FS
REF
V
= 0.01 V
ZERO
REF
V
= ——— (V
- V
) + V
DAC
CODE
255
FS
ZERO
OPT 505
GND
VDD
V
H
REF
V
L
REF
CONTROL
& DATA
+
–
OP 07
V
=
(
) -V
OUT
RF
R +
I
-15V
+15V
+5V
RR
I
F
RI
I
RF
VDAC
For R =
I
RF
V
= 2V
-V
OUT
I
DAC
Vi
V
OUT
Buffered DAC Output
Amplified DAC Output
APPLICATION CIRCUITS
OPT 505
GND
VDD
V
H
REF
V
L
REF
CONTROL
& DATA
+
–
OP 07
VOUT
-15V
+15V
+5V
RR
I
F
V
= (1 + –––) V
OUT
DAC
RF
RI
OPT 505
GND
VDD
V
H
REF
V
L
REF
CONTROL
& DATA
+
–
OP 07
VOUT
-15V
+15V
+5V
V
= V
OUT
DAC
CAT512
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