參數資料
型號: AD5282BRU50-REEL7
廠商: Analog Devices Inc
文件頁數: 16/28頁
文件大?。?/td> 0K
描述: IC DGTL POT DUAL 256POS 16-TSSOP
標準包裝: 1,000
接片: 256
電阻(歐姆): 50k
電路數: 2
溫度系數: 標準值 30 ppm/°C
存儲器類型: 易失
接口: I²C(設備位址)
電源電壓: 4.5 V ~ 16.5 V,±4.5 V ~ 5.5 V
工作溫度: -40°C ~ 85°C
安裝類型: 表面貼裝
封裝/外殼: 16-TSSOP(0.173",4.40mm 寬)
供應商設備封裝: 16-TSSOP
包裝: 帶卷 (TR)
AD5280/AD5282
Rev. C | Page 23 of
28
PROGRAMMABLE LOW-PASS FILTER
At resonance, setting the following balances the bridge:
In analog-to-digital conversion applications, it is common to
include an antialiasing filter to band-limit the sampling signal.
Dual-channel digital potentiometers can be used to construct
a second-order Sallen key low-pass filter (see Figure 63). The
design equations are
2
O
V
ω
=
2
O
i
S
Q
S
V
ω
+
ω
+
(11)
R1R2C1C2
O
1
=
ω
(12)
R2C2
R1C1
Q
1
+
=
(13)
Users can first select some convenient values for the capacitors.
To achieve maximally flat bandwidth where Q = 0.707, let C1 be
twice the size of C2 and let R1 = R2. As a result, R1 and R2 can be
adjusted to the same settings to achieve the desirable bandwidth.
VI
U1
VO
R1
A
R
W
B
R2
A
R
W
B
C2
C
C1
C
+2.5V
V+
V–
–2.5V
AD8601
ADJUSTED TO
SAME SETTING
02
92
9-
0
6
3
Figure 63. Sallen Key Low-Pass Filter
PROGRAMMABLE OSCILLATOR
In a classic Wien-bridge oscillator (Figure 64), the Wien
network (R, R', C, C') provides positive feedback, while R1
and R2 provide negative feedback. At the resonant frequency, fO,
the overall phase shift is 0, and the positive feedback causes the
circuit to oscillate. With R = R', C = C', and R2 = R2A//(R2B +
Rdiode), the oscillation frequency is
RC
f
or
RC
o
O
π
ω
1
=
2
(14)
where R is equal to RWA such that
AB
R
D
R
256
=
(15)
2
=
R1
R2
(16)
In practice, R2/R1 should be set slightly larger than 2 to ensure
that oscillation can start. On the other hand, the alternate turn-
on of Diode D1 and Diode D2 ensures that R2/R1 are smaller
than 2 momentarily and, therefore, stabilizes the oscillation.
Once the frequency is set, the oscillation amplitude can be
tuned by R2B because
D
B
D
O
V
R2
I
V
+
=
3
2
(17)
VO, ID, and VD are interdependent variables. With proper
selection of R2B, an equilibrium is reached such that VO
converges. R2B can be in series with a discrete resistor to
increase the amplitude, but the total resistance cannot be
too large to prevent saturation of the output.
FREQUENCY
ADJUSTMENT
C
2.2nF
CI
2.2nF
RI
10k
R
10k
BA
A
W
V+
V–
B
W
D1
D2
VO
U1
VP
A
VN
–2.5V
+2.5V
R1
1k
R2B
10k
R2A
2.1k
R1 = R1I = R2B = AD5282
D1 = D2 = 1N4148
AMPLITUDE
ADJUSTMENT
02
92
9-
06
4
OP1177
Figure 64. Programmable Oscillator with Amplitude Control
相關PDF資料
PDF描述
DS1100LZ-175+T IC DELAY LINE 5TAP 175NS 8-SOIC
AD5282BRU200-REEL7 IC DGTL POT DUAL 256POS 16-TSSOP
M83723/85R14077 CONN RCPT 7POS JAM NUT W/PINS
VI-B4Y-MX-F4 CONVERTER MOD DC/DC 3.3V 49.5W
MS3450W24-28PZ CONN RCPT 24POS WALL MNT W/PINS
相關代理商/技術參數
參數描述
AD5282BRUZ20 功能描述:IC DUAL POT 20K 256POS 16-TSSOP RoHS:是 類別:集成電路 (IC) >> 數據采集 - 數字電位器 系列:- 產品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:1 系列:- 接片:256 電阻(歐姆):100k 電路數:1 溫度系數:標準值 35 ppm/°C 存儲器類型:非易失 接口:3 線串口 電源電壓:2.7 V ~ 5.25 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-WDFN 裸露焊盤 供應商設備封裝:8-TDFN-EP(3x3) 包裝:剪切帶 (CT) 產品目錄頁面:1399 (CN2011-ZH PDF) 其它名稱:MAX5423ETA+TCT
AD5282BRUZ200 功能描述:IC DUAL POT 200K 256POS 16-TSSOP RoHS:是 類別:集成電路 (IC) >> 數據采集 - 數字電位器 系列:- 產品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:1 系列:- 接片:256 電阻(歐姆):100k 電路數:1 溫度系數:標準值 35 ppm/°C 存儲器類型:非易失 接口:3 線串口 電源電壓:2.7 V ~ 5.25 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-WDFN 裸露焊盤 供應商設備封裝:8-TDFN-EP(3x3) 包裝:剪切帶 (CT) 產品目錄頁面:1399 (CN2011-ZH PDF) 其它名稱:MAX5423ETA+TCT
AD5282BRUZ2002 制造商:AD 制造商全稱:Analog Devices 功能描述:Single/Dual,15 V/5 V,256-Position I2C-Compatible Digital Potentiometer
AD5282BRUZ200-R7 功能描述:IC POT DGTL 200K 256POS 16TSSOP RoHS:是 類別:集成電路 (IC) >> 數據采集 - 數字電位器 系列:- 標準包裝:3,000 系列:DPP 接片:32 電阻(歐姆):10k 電路數:1 溫度系數:標準值 300 ppm/°C 存儲器類型:非易失 接口:3 線串行(芯片選擇,遞增,增/減) 電源電壓:2.5 V ~ 6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-WFDFN 裸露焊盤 供應商設備封裝:8-TDFN(2x3) 包裝:帶卷 (TR)
AD5282BRUZ200-R72 制造商:AD 制造商全稱:Analog Devices 功能描述:Single/Dual,15 V/5 V,256-Position I2C-Compatible Digital Potentiometer