參數(shù)資料
型號： CAT523J-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)： 9/11頁
文件大?。?/td> 100K
代理商： CAT523J-TE13
CAT523
7
Doc. No. 2005, Rev. E
CAT523
GND
VDD
VREFH
VREFL
CONTROL
& DATA
+
–
OP 07
V
=
(
) -V
OUT
RF
R +
i
-15V
+15V
+5V
RR
i
F
Ri
i
RF
V DPP
For R =
i
RF
V
= 2V
-V
OUT
i
DPP
Vi
VOUT
APPLICATION CIRCUITS
Since this value is the 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 CAT523 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 wiper settings
may be changed as many times as required and can be
made to any of the two DPPs in any order or sequence.
The temporary setting(s) remain in effect long as CS
remains high. When CS returns low all two DPPs will
return to the output values stored in non-volatile memory.
When it is desired to save a new setting acquired using
Figure 3. Temporary Change in Output
this feature, the new value must be reloaded into the
DPP wiper control register prior to programming. This is
because the CAT523’s internal control circuitry discards
the new data from the programming register two clock
cycles after receiving it (after reception is complete) if no
PROG signal is received.
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
Bipolar DPP 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
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
REF
V
= 0.01 V
ZERO
REF
V
= ——— (V
- V
) + V
DPP
CODE
255
FS
ZERO
Amplified DPP Output
CAT523
GND
VDD
VREFH
VREFL
CONTROL
& DATA
+
–
OP 07
VOUT
-15V
+15V
+5V
RR
i
F
V
= (1 + –––) V
OUT
DPP
RF
R I
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