參數(shù)資料
型號： CAT525W
元件分類： 模擬信號調(diào)理
英文描述： SPECIALTY ANALOG CIRCUIT, PDSO20
封裝： LEAD-FREE, SOIC-20
文件頁數(shù)： 10/12頁
文件大?。?/td> 97K
代理商： CAT525W
CAT525
7
Doc. No. 2001, Rev. E
Figure 3. Temporary Change in Output
same as that which had been there previously no change
in the DPP’s output is noticed. Had the value held in the
control register been different from that stored in non-
volatile memory then a change would occur at the read
cycle’s conclusion.
TEMPORARILY CHANGE OUTPUT
The CAT525 allows temporary changes in DPP’s output
to be made without disturbing the settings retained in
non-volatile 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. DPP settings may be
changed as many times as required and can be made to
any of the four DPPs in any order or sequence. The
temporary setting(s) remain in effect long as CS remains
high. When CS returns low all four DPPs will return to the
output values stored in non-volatile memory.
When it is desired to save a new setting acquired using
this feature, the new value must be reloaded into the
DPP control register prior to programming. This is
because the CAT525’s internal control circuitry discards
from the programming register the new data two clock
cycles after receiving it if no PROG signal is received.
Amplified DPP Output
APPLICATION CIRCUITS
Bipolar DPP Output
CAT525
GND
VDD
VREFH
VREFL
CONTROL
& DATA
+
–
OP 07
V
=
(
) -V
OUT
RF
R +
I
-15V
+15V
+5V
RR
I
F
RI
I
RF
VDPP
For R =
I
RF
V
= 2V
-V
OUT
I
DPP
Vi
V
OUT
VDPP
A
lifi d DAC O
CAT525
GND
VDD
VREFH
VREFL
CONTROL
& DATA
+
–
OP 07
VOUT
-15V
+15V
+5V
RR
I
F
V
= (1 + –––) V
OUT
DPP
RF
RI
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
DPP INPUT
DPP 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
V
= 0.01 V
ZERO
REF
V
= ——— (V
- V
) + V
DPP
CODE
255
FS
ZERO
REF
D0
D1
D2
D3
D4
D5
D6
D7
A0
A1
D0
D1
D2
D3
D4
D5
D6
D7
1
NEW DPP DATA
CURRENT DPP DATA
DO
DI
CS
PROG
DPP
OUTPUT
t
1
2
3
4
5
6
7
8
9
10
11
12
N
N+1 N+2
o
CURRENT
DPP VALUE
NON-VOLATILE
NEW
DPP VALUE
VOLATILE
CURRENT
DPP VALUE
NON-VOLATILE
RDY/BSY
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