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參數(shù)資料
| 型號： | AD5232BRU50-REEL7 |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 數(shù)字電位計 |
| 英文描述： | 8-Bit Dual Nonvolatile Memory Digital Potentiometer |
| 中文描述： | DUAL 50K DIGITAL POTENTIOMETER, 3-WIRE SERIAL CONTROL INTERFACE, 256 POSITIONS, PDSO16 |
| 封裝： | MO-153AB, TSSOP-16 |
| 文件頁數(shù)： | 14/20頁 |
| 文件大?。?/td> | 268K |
| 代理商： | AD5232BRU50-REEL7 |
REV. 0
–14–
AD5232
T able X . Active T rimming of One POT Followed by a Save to
Nonvolatile Memory (PCB Calibrate)
SDI
B040
H
SDO
X X X X
H
Action
Loads 40
H
data into RDAC1 register,
Wiper W1 moves to 1/4 full-scale
position.
Increments RDAC1 register by one to
41
H
, Wiper W1 moves one resistor
segment away from terminal B.
Increments RDAC1 register by one to
42
H
, Wiper W1 moves one more
resistor segment away from terminal B.
Continue until desired wiper position
reached.
Saves RDAC 1 register data into
corresponding nonvolatile EEMEM1
memory ADDR = 0
H
.
E0X X
H
B040
H
E0X X
H
E0X X
H
20X X
H
E0X X
H
E QUIPME NT CUST OME R ST ART UP SE QUE NCE FOR A
PCB CALIBRAT E D UNIT WIT H PROT E CT E D SE T T INGS
PCB setting: T ie
WP
to GND [prevents changes in PCB
wiper set position]
Power V
DD
and V
SS
with respect to GND
Optional: Strobe
PR
pin [ensures full power ON preset of
wiper register with EEMEM contents in unpredictable supply
sequencing environments]
T able X I. Using Left Shift by One to Change Circuit Gain in
6 dB Steps
SDI
C1X X
H
SDO
X X X X
H
Action
Moves Wiper W2 to double the present
data value contained in RDAC2 regis-
ter, in the direction of the A terminal.
Moves Wiper W2 to double the present
data value contained in RDAC2 regis-
ter, in the direction of the A terminal.
C1X X
H
X X X X
H
T able X II. Storing Additional Data in Nonvolatile Memory
SDI
3280
H
SDO
X X X X
H
Action
Stores 80
H
data into spare EEMEM
location USER1.
Stores 40
H
data into spare EEMEM
location USER2.
3340
H
X X X X
H
Table XIII. Reading Back Data from Various Memory Locations
SDI
94X X
H
SDO
X X X X
H
Action
Prepares data read from USER3 location.
Assumption: USER3 previously loaded
with 80
H
.
NOP instruction #0 sends 16-bit word
out of SDO where the last 8 bits con-
tain the contents of USER3 location.
NOP command ensures device returns
to idle power dissipation state.
00X X
H
X X 80
H
Analog Devices offers the AD5232EVAL board for sale to
simplify evaluation of these programmable devices controlled by
a personal computer via the printer port.
T E ST CIRCUIT S
Figures 13 to 22 define the test conditions used in the product
specification’s table.
A
W
B
NC
I
W
DUT
V
MS
NC = NO CONNECT
Figure 13. Resistor Position Nonlinearity Error (Rheostat
Operation; R-INL, R-DNL)
A
W
B
DUT
V
MS
V+
V+ = V
DD
1LSB = V+/2
N
Figure 14. Potentiometer Divider Nonlinearity Error Test
Circuit (INL, DNL)
A
W
B
DUT
I
W
V
MS1
V
MS2
V
W
R
W =
[
V
MS1
–
V
MS2
]
/I
W
Figure 15. Wiper Resistance Test Circuit
A
W
B
V
MS
V+ = V
DD
10%
PSRR (dB) = 20 LOG
V
MS
V
DD
(
)
~
V
A
V
DD
V
MS%
V
DD%
PSS (%/%) =
V+
Figure 16. Power Supply Sensitivity Test Circuit (PSS, PSRR)
~
OFFSET BIAS
OFFSET
GND
A
B
DUT
W
5V
V
IN
V
OUT
OP279
Figure 17. Inverting Gain Test Circuit
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