參數(shù)資料
型號： CAT512
英文描述： 8-Bit Dual Digital POT with Independent Reference Inputs(帶獨立電壓基準輸入的雙路，8位數(shù)字電位器)
中文描述： 8位雙數(shù)字電位器與獨立的基準輸入（帶獨立電壓基準輸入的雙路，8位數(shù)字電位器）
文件頁數(shù)： 7/10頁
文件大?。?/td> 71K
代理商： CAT512
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
to
CURRENT
NON-VOLATILE
DANEW
VOLATILE
CURRENT
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 1111 255
1000 0000 128
REF
REF
0111 1111 255
0000 0001 255
0000 0000 0
REF
REF
F
VREF
RI
OUT
DAC INPUT DAC OUTPUT ANALOG
OUTPUT
REF
REF
OUT
REF
REF
OUT
REF
REF
OUT
REF
REF
OUT
FS
VZERO
REF
REF
VDAC
255
CODE
FS
ZERO
ZERO
OPT 505
CAT512
GND
VDD
REF
REF
CONTROL
& DATA
+
–
OP 07
OUT
RF
R +
-15V
+15V
+5V
R
R
I
F
RI
I
RF
VDAC
For RI
OUT
RF
I
DAC
Vi
VOUT
Buffered DAC Output
Amplified DAC Output
APPLICATION CIRCUITS
CAT512
GND
VDD
REF
REF
CONTROL
& DATA
+
–
OP 07
VOUT
-15V
+15V
+5V
R
R
I
F
OUT RI
–––
) V
OPT 505
CAT512
GND
VDD
REF
REF
CONTROL
& DATA
+
–
OP 07
VOUT
-15V
+15V
+5V
OUT DAC
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