參數(shù)資料
型號: AD5113BCPZ5-500R7
廠商: Analog Devices Inc
文件頁數(shù): 11/24頁
文件大小: 0K
描述: IC DGTL POT 64POS 5K 8LFCSP
標準包裝: 1
接片: 64
電阻(歐姆): 5k
電路數(shù): 1
溫度系數(shù): 標準值 35 ppm/°C
存儲器類型: 非易失
接口: 3 線串行(芯片選擇,增/減)
電源電壓: 2.3 V ~ 5.5 V
工作溫度: -40°C ~ 125°C
安裝類型: 表面貼裝
封裝/外殼: 8-UFDFN 裸露焊盤,CSP
供應(yīng)商設(shè)備封裝: 8-LFCSP-UD(2x2)
包裝: 標準包裝
其它名稱: AD5113BCPZ5-500R7DKR
Data Sheet
AD5111/AD5113/AD5115
Rev.
| Page 19 of 24
RDAC ARCHITECTURE
To achieve optimum performance, Analog Devices, Inc., has
patented the RDAC segmentation architecture for all the digital
potentiometers. In particular, the AD5111/AD5113/AD5115
employ a two-stage segmentation approach as shown in
designed with the transmission gate CMOS topology and with
the gate voltage derived from VDD.
RL
RS
W
RS
A
B
BS
5-BIT/6-BIT/7-BIT
ADDRESS
DECODER
TS
09
65
4-
0
43
Low Wiper Resistance Feature
In addition, the AD5111/AD5113/AD5115 include a new
feature to reduce the resistance between terminals. These extra
steps are called bottom scale and top scale. At bottom scale, the
typical wiper resistance decreases from 70 Ω to 45 Ω. At top
scale, the resistance between Terminal A and Terminal W is
decreased by 1 LSB and the total resistance is reduced to 70 Ω.
The extra steps are not equal to 1 LSB and are not included in
the INL, DNL, R-INL, and R-DNL specifications.
PROGRAMMING THE VARIABLE RESISTOR
Rheostat Operation—±8% Resistor Tolerance
The AD5111/AD5113/AD5115 operate in rheostat mode when
only two terminals are used as a variable resistor. The unused
terminal can be floating or tied to the W terminal as shown in
A
W
B
A
W
B
A
W
B
09
65
4-
04
4
Figure 43. Rheostat Mode Configuration
The nominal resistance between Terminal A and Terminal B,
RAB, is available in 5 kΩ, 10 kΩ, and 80 kΩ and has 128/64/32
tap points accessed by the wiper terminal. The 5-/6-/7-bit data
in the RDAC latch is decoded to select one of the 128/64/32
possible wiper settings. The general equations for determining
the digitally programmed output resistance between the W
terminal and B terminal are
BS
WB
R
Bottom scale (1)
W
AB
WB
R
D
R
128
)
(
From 0 to 128 (2)
BS
WB
R
Bottom scale (3)
W
AB
WB
R
D
R
64
)
(
From 0 to 64 (4)
BS
WB
R
Bottom scale (5)
W
AB
WB
R
D
R
32
)
(
From 0 to 32 (6)
where:
D is the decimal equivalent of the binary code in the 5-/6-/7-bit
RDAC register; 128, 64, and 32 refer to the top scale step.
RAB is the end-to-end resistance.
RW is the wiper resistance.
RBS is the wiper resistance at bottom scale.
A
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