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參數(shù)資料
| 型號： | AD5273EVAL |
| 廠商： | Analog Devices, Inc. |
| 元件分類： | 數(shù)字電位計 |
| 英文描述： | 64-Position OTP Digital Potentiometer |
| 中文描述： | 64工位檢察官數(shù)字電位器 |
| 文件頁數(shù)： | 15/20頁 |
| 文件大?。?/td> | 987K |
| 代理商： | AD5273EVAL |
AD5273
–15–
CONTROLLING TWO DEVICES ON ONE BUS
Figure 12 shows two AD5273 devices on the same serial bus.
Each has a different slave address since the state of each AD0
pin is different. This allows each device to operate independently.
The master device output bus line drivers are open-drain pull
downs in a fully I
2
C compatible interface.
MASTER
SDA SCL
AD0
AD5273
SDA SCL
AD0
AD5273
SDA
SCL
5V
Rp
Rp
5V
Figure 12. Two AD5273 Devices on One Bus
APPLICATIONS
Programmable Voltage Reference
For Voltage Divider mode operation, as shown in Figure 13, it is
common to buffer the output of the digital potentiometer unless
the load is much larger than R
WB
. Not only does the buffer serve
the purpose of impedance conversion, it also allows a heavier
load to be driven.
I
2
C Controller Programming
Write Bit Pattern Illustrations
SDA
FRAME 1
SLAVE ADDRESS BYTE
FRAME 2
INSTRUCTION BYTE
FRAME 1
DATA BYTE
SCL
ACK. BY
AD5273
ACK. BY
AD5273
ACK. BY
AD5273
STOP BY
MASTER
START BY
MASTER
0
0
1
0
1
1
0
AD0 R/
W
0
X
X
X
X
X
X
X
X
X
D5
D4
D3
D2
D1
D0
8
0
8
0
8
Figure 10a. Writing to the RDAC Register
SDA
FRAME 1
SLAVE ADDRESS BYTE
FRAME 2
INSTRUCTION BYTE
FRAME 1
DATA BYTE
SCL
ACK. BY
AD5273
ACK. BY
AD5273
ACK. BY
AD5273
STOP BY
MASTER
START BY
MASTER
0
0
1
0
1
1
0
AD0 R/
W
1
X
X
X
X
X
X
X
X
X
D5
D4
D3
D2
D1
D0
8
0
8
0
8
Figure 10b. Activating One Time Programming
Read Bit Pattern Illustration
SDA
FRAME 1
SLAVE ADDRESS BYTE
FRAME 2
DATA BYTE FROM SELECTED
RDAC REGISTER
SCL
ACK. BY
AD5273
NO ACK. BY
MASTER
STOP BY
MASTER
START BY
MASTER
0
0
1
0
1
1
0
AD0
E1
E0
D5
D4
D3
D2
D1
D0
8
0
8
R/
W
Figure 11. Reading Data From the RDAC Register
GND
V
IN
V
OUT
1
U1
5V
2
3
V
O
AD8601
5V
AW
B
ADR03
U3
AD5273
U2
Figure 13. Programmable Voltage Reference
Programmable Voltage Source with Boosted Output
For applications that require high current adjustment such as a
laser diode driver or tunable laser, a boosted voltage source can
be considered. See Figure 14.
+V
U2
W
SIGNAL
C
C
R
BIAS
LD
V
IN
A
B
V
OUT
U1
AD5273
U3 2N7002
AD8601
–V
I
L
Figure 14. Programmable Booster Voltage Source
In this circuit, the inverting input of the op amp forces the V
OUT
to be equal to the wiper voltage set by the digital potentiometer.
The load current is then delivered by the supply via the N-Ch
REV. 0
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