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參數(shù)資料
| 型號： | AD7376ARUZ50-REEL7 |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 4/20頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC DIGITAL POT 50K 14-TSSOP |
| 標準包裝： | 1,000 |
| 接片： | 128 |
| 電阻（歐姆）： | 50k |
| 電路數(shù)： | 1 |
| 溫度系數(shù)： | 標準值 300 ppm/°C |
| 存儲器類型： | 易失 |
| 接口： | 4 線 SPI（芯片選擇） |
| 電源電壓： | 4.5 V ~ 33 V，±4.5 V ~ 16.5 V |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 14-TSSOP（0.173"，4.40mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 14-TSSOP |
| 包裝： | 帶卷 (TR) |
| 配用： | EVAL-AD7376EBZ-ND - BOARD EVAL FOR AD7376 |
AD7376
Rev. D | Page 12 of 20
THEORY OF OPERATION
PROGRAMMING THE VARIABLE RESISTOR
Rheostat Operation
The part operates in rheostat mode when only two terminals
are used as a variable resistor. The unused terminal can be left
floating or tied to the W terminal as shown in Figure 24.
A
W
B
A
W
B
A
W
B
01
1
9-
02
4
Figure 24. Rheostat Mode Configuration
The nominal resistance between Terminals A and B, RAB, is
available in 10 kΩ, 50 kΩ, and 100 kΩ with ±30% tolerance and
has 128 tap points accessed by the wiper terminal. The 7-bit
data in the RDAC latch is decoded to select one of the 128
possible settings. Figure 25 shows a simplified RDAC structure.
RS
0x01
0x7F
0x00
A
W
B
SWB
01
1
9-
0
25
D6
D5
D4
D3
D2
D1
D0
RDAC
LATCH
AND
DECODER
SWA
RS = RNOMINAL/128
SHDN
Figure 25. AD7376 Equivalent RDAC Circuit
The general equation determining the digitally programmed
output resistance between the W and the B terminals is
W
AB
WB
R
D
R
128
)
(
(1)
where:
D
is the decimal equivalent of the binary code loaded in the
7-bit RDAC register from 0 to 127.
RAB
is the end-to-end resistance.
RW
is the wiper resistance contributed by the on resistance of
the internal switch.
The AD7376 wiper switches are designed with the transmission
gate CMOS topology, and the gate voltage is derived from the
VDD. Each switch’s on resistance, RW, is a function of VDD and
temperature (see Figure 13).
Contrary to the temperature coefficient of RAB, the temperature
coefficient of the wiper resistance is significantly higher because
the wiper resistance doubles with every 100° increase. As a result,
the user must take into consideration the contribution of RW on
the desirable resistance. On the other hand, each switch’s on
resistance is insensitive to the tap point potential and remains
relatively flat at 120 Ω typical at a VDD of 15 V and a
temperature of 25°C.
Assuming that a 10 kΩ part is used, the wiper’s first connection
starts at the B terminal for programming code 0x00, where SWB
is closed. The minimum resistance between Terminals W and B
is therefore 120 Ω in general. The second connection is the first
tap point, which corresponds to 198 Ω (RWB = 1/128 × RAB + RW
= 78 Ω + 120 Ω) for programming code 0x01, and so on.
Each LSB data value increase moves the wiper up the resistor
ladder until the last tap point is reached at 10,042 Ω (RAB – 1 LSB +
RW
). Regardless of which settings the part is operating with, care
should be taken to limit the current conducted between any A
and B, W and A, or W and B terminals to a maximum dc
current of 5 mA and a maximum pulse current of 20 mA.
Otherwise, degradation or possible destruction of the internal
switch contact can occur.
Similar to the mechanical potentiometer, the resistance of the
RDAC between the W and A terminals also produces a digitally
controlled complementary resistance, RWA.
When these terminals are used, the B terminal can be opened.
Setting the resistance value for RWA starts at a maximum value
of resistance and decreases as the data loaded into the latch
increases in value. The general equation for this operation is
W
AB
WA
R
D
R
128
)
(
(2)
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| AD7376EVAL | 制造商:Analog Devices 功能描述: |
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