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CAT521 Arkusz danych(PDF) 7 Page - Catalyst Semiconductor

Numer części CAT521
Szczegółowy opis  8-Bit Digital POT With Independent Reference Inputs
PDF  9 Pages
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Producent  CATALYST [Catalyst Semiconductor]
Strona internetowa  http://www.catalyst-semiconductor.com
Logo CATALYST - Catalyst Semiconductor

CAT521 Arkusz danych(HTML) 7 Page - Catalyst Semiconductor

  CAT521 Datasheet HTML 1Page - Catalyst Semiconductor CAT521 Datasheet HTML 2Page - Catalyst Semiconductor CAT521 Datasheet HTML 3Page - Catalyst Semiconductor CAT521 Datasheet HTML 4Page - Catalyst Semiconductor CAT521 Datasheet HTML 5Page - Catalyst Semiconductor CAT521 Datasheet HTML 6Page - Catalyst Semiconductor CAT521 Datasheet HTML 7Page - Catalyst Semiconductor CAT521 Datasheet HTML 8Page - Catalyst Semiconductor CAT521 Datasheet HTML 9Page - Catalyst Semiconductor  
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CAT521
7
Advanced Information
MSB
LSB
1111
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
0000
—— (.98 V
) + .01 V
= .010 V
V
= -4.90V
REF
REF
REF
IF
V
= 5V
REF
255
255
OUT
DAC INPUT
DAC OUTPUT
ANALOG
R = R
OUTPUT
REF
REF
REF
OUT
128
255
127
255
REF
REF
REF
OUT
1
255
REF
REF
REF
OUT
REF
REF
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
ZERO
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 CAT521 allows temporary changes in the DAC’s
output to be made without disturbing the settings re-
tained 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. The temporary
setting remains in effect long as CS remains high. When
CS returns low the DAC will return to the output value
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 CAT521’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 DAC Output
APPLICATION CIRCUITS
Bipolar DAC Output
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
CAT521
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
CAT521



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