VO V+ V– AD8552 –2.5VREF B A W A1 U1 +2.5V" />
參數(shù)資料
型號： AD5231BRU10-REEL7
廠商： Analog Devices Inc
文件頁數(shù)： 17/28頁
文件大?。?/td> 0K
描述： IC DGTL POT 1024POS 16-TSSOP TR
標準包裝： 1,000
接片： 1024
電阻（歐姆）： 10k
電路數(shù)： 1
溫度系數(shù)： 標準值 600 ppm/°C
存儲器類型： 非易失
接口： 4 線 SPI（芯片選擇）
電源電壓： 2.7 V ~ 5.5 V，±2.25 V ~ 2.75 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)
AD5231
Data Sheet
Rev. D | Page 24 of 28
V+
V–
AD8552
AD5231
VO
V+
V–
AD8552
–2.5VREF
B
A
W
A1
U1
+2.5VREF
VOUT
VIN
TRIM
GND
ADR421
+5V
–5V
+5V
R
A2
+5V
02739-
048
Figure 49. 10-Bit Bipolar DAC
10-BIT UNIPOLAR DAC
Figure 50 shows a unipolar 10-bit DAC using AD5231. The
buffer is needed to drive various leads.
AD5231
V+
V–
AD8601
W
A1
GND
AD1582
5V
U1
3
A
B
VO
1
2
VOUT
VIN
02739-
049
Figure 50. 10-Bit Unipolar DAC
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 51).
AD5231
V+
V–
W
AD8601
A
B
VIN
VOUT
IL
2N7002
RBIAS
SIGNAL CC
LD
U2
02739-
058
Figure 51. Programmable Booster Voltage Source
In this circuit, the inverting input of the op amp forces the VOUT
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 FET N1. N1 power handling must be adequate to dissipate
(Vi VO) × IL power. This circuit can source a maximum of
100 mA with a 5 V supply.
For precision applications, a voltage reference such as ADR421,
ADR03, or ADR370 can be applied at Terminal A of the digital
potentiometer.
PROGRAMMABLE CURRENT SOURCE
A programmable current source can be implemented with the
circuit shown in Figure 52.
V+
V–
OP1177
U2
VIN
SLEEP
REF191
GND
VOUT
3
2
4
6
U1
AD5231
W
A
B
VL
IL
+5V
–5V
+5V
+
–
–2.048V TO VL
0V TO (2.048V + VL)
RS
102
C1
1F
RL
100
02739-
051
Figure 52. Programmable Current Source
REF191 is a unique low supply, headroom precision reference
that can deliver the 20 mA needed at 2.048 V. The load current
is simply the voltage across Terminals B–W of the digital
potentiometer divided by RS:
1024
×
=
S
REF
L
R
D
V
I
(7)
The circuit is simple, but be aware that there are two issues.
First, dual-supply op amps are ideal because the ground
potential of REF191 can swing from 2.048 V at zero scale to VL
at full scale of the potentiometer setting. Although the circuit
works under single-supply, the programmable resolution of the
system is reduced. Second, the voltage compliance at VL is
limited to 2.5 V or equivalently a 125 load. Should higher
voltage compliance be needed, users can consider digital
shows an alternate circuit for high voltage compliance.
To achieve higher current, such as when driving a high power
LED, the user can replace the UI with an LDO, reduce RS, and
add a resistor in series with the digital potentiometer’s
A terminal. This limits the potentiometer’s current and
increases the current adjustment resolution.
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相關代理商/技術參數(shù)
參數(shù)描述
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AD5231BRUZ10 功能描述:IC POT DGTL 1024POS 16-TSSOP RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 數(shù)字電位器 系列:- 產(chǎn)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(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(chǎn)品目錄頁面:1399 (CN2011-ZH PDF) 其它名稱:MAX5423ETA+TCT
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