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鍙冩暩(sh霉)璩囨枡
| 鍨嬭櫉(h脿o)锛� | AD5280BRUZ20 |
| 寤犲晢锛� | Analog Devices Inc |
| 鏂囦欢闋佹暩(sh霉)锛� | 14/28闋� |
| 鏂囦欢澶�?銆�?/td> | 0K |
| 鎻忚堪锛� | IC DGTL POT 15V 20K 14-TSSOP |
| 妯�(bi膩o)婧�(zh菙n)鍖呰锛� | 96 |
| 鎺ョ墖锛� | 256 |
| 闆婚樆锛堟瓙濮嗭級锛� | 20k |
| 闆昏矾鏁�(sh霉)锛� | 1 |
| 婧害绯绘暩(sh霉)锛� | 妯�(bi膩o)婧�(zh菙n)鍊� 30 ppm/°C |
| 瀛樺劜(ch菙)鍣ㄩ鍨嬶細 | 鏄撳け |
| 鎺ュ彛锛� | I²C锛堣ō(sh猫)鍌欎綅鍧€锛� |
| 闆绘簮闆诲锛� | 4.5 V ~ 16.5 V锛�±4.5 V ~ 5.5 V |
| 宸ヤ綔婧害锛� | -40°C ~ 85°C |
| 瀹夎椤炲瀷锛� | 琛ㄩ潰璨艰 |
| 灏佽/澶栨锛� | 14-TSSOP锛�0.173"锛�4.40mm 瀵級 |
| 渚涙噳(y墨ng)鍟嗚ō(sh猫)鍌欏皝瑁濓細 | 14-TSSOP |
| 鍖呰锛� | 绠′欢 |
| 鐢�(ch菐n)鍝佺洰閷勯爜闈細 | 787 (CN2011-ZH PDF) |
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AD5280/AD5282
Rev. C | Page 21 of
28
8-BIT BIPOLAR DAC
0
29
-05
8
VIN
VOUT
U1
A1
+5VREF
U2
VO
A2
U2 鈥�
W
鈥�15V
鈥�5VREF
鈥�15V
+
鈥�
OP2177
+
鈥�
OP2177
B
RR
A
V1
TRIM
ADR425
GND
AD5280
+15V
Figure 58. 8-Bit Bipolar DAC
Figure 58 shows a low cost, 8-bit, bipolar DAC. It offers the same
number of adjustable steps but not the precision of conventional
DACs. The linearity and temperature coefficients, especially at
low value codes, are skewed by the effects of the digital potenti-
ometer wiper resistance. The output of this circuit is
REF
O
V
脳
=
1
256
D
2
(6)
BIPOLAR PROGRAMMABLE GAIN AMPLIFIER
02
92
9-
05
9
U2
U1
A2
V1
A1
B1
W2
A2
W1
VDD
A1
VDD
VS8
B2
V
VS8
O
R2
R1
C1
鈥搆VI
V+
V鈥�
+
鈥�
OP2177
V+
V鈥�
+
鈥�
OP2177
AD5282
Figure 59. Bipolar Programmable Gain Amplifier
For applications that require bipolar gain, Figure 59 shows one
implementation similar to the previous circuit. The digital
potentiometer, U1, sets the adjustment range. The wiper voltage
at W2 can therefore be programmed between Vi and 鈥揔Vi at a
given U2 setting. Configuring A2 in noninverting mode allows
linear gain and attenuation. The transfer function is
()
+
脳
+
=
K
R1
V
i
O
1
256
1
D2
R2
V
(7)
where K is the ratio of RWB1/RWA1 set by U1.
As in the previous example, in the simpler and more common
case where K = 1, a single digital AD5280 potentiometer is
used. U1 is replaced by a matched pair of resistors to apply
Vi and Vi at the ends of the digital potentiometer. The
relationship becomes
i
O
V
D2
R1
R2
V
脳
+
=
1
256
2
1
(7)
If R2 is large, a compensation capacitor having a few pF may be
needed to avoid any gain peaking.
Table 7 shows the result of adjusting D, with A2 configured as a
unity gain, a gain of 2, and a gain of 10. The result is a bipolar
amplifier with linearly programmable gain and a 256-step
resolution.
Table 7. Result of Bipolar Gain Amplifier
D
R1 = 鈭�, R2 = 0
R1 = R2
R2 = 9R1
0
1
2
10
64
0.5
1
5
128
0
192
0.5
1
5
255
0.968
1.937
9.680
PROGRAMMABLE VOLTAGE SOURCE WITH
BOOSTED OUTPUT
For applications that require high current adjustments, such as a
laser diode driver or tunable laser, a boosted voltage source can
be considered (see Figure 60).
02
92
9-
06
0
CC
VI
5V
U1 = AD5280
A1 = AD8501, AD8605, AD8541
N1 = FDV301N, 2N7002
U1
RBIAS
IL
N1
VO
V+
V鈥�
+
鈥�
A1
A
B
W
SIGNAL
LD
Figure 60. Programmable Booster Voltage Source
In this circuit, the inverting input of the op amp forces the
VBIAS to be equal to the wiper voltage set by the digital potenti-
ometer. The load current is then delivered by the supply via the
N-channel FET N1. The N1 power handling must be adequate
to dissipate (Vi 鈥� VO) 脳 IL power. This circuit can source a
maximum of 100 mA with a 5 V supply. A1 needs to be a rail-
to-rail input type. For precision applications, a voltage reference
input of the digital potentiometer.
鐩搁棞(gu膩n)PDF璩囨枡 |
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鐩搁棞(gu膩n)浠ｇ悊鍟�/鎶€琛�(sh霉)鍙冩暩(sh霉) |
鍙冩暩(sh霉)鎻忚堪 |
|---|---|
| AD5280BRUZ20 | 鍒堕€犲晢:Analog Devices 鍔熻兘鎻忚堪:IC 8-BIT DIGITAL POT |
| AD5280BRUZ200 | 鍔熻兘鎻忚堪:IC DGTL POT 200K 256POS 14-TSSOP RoHS:鏄� 椤炲垾:闆嗘垚闆昏矾 (IC) >> 鏁�(sh霉)鎿�(j霉)閲囬泦 - 鏁�(sh霉)瀛楅浕浣嶅櫒 绯诲垪:- 妯�(bi膩o)婧�(zh菙n)鍖呰:3,300 绯诲垪:WiperLock™ 鎺ョ墖:257 闆婚樆锛堟瓙濮嗭級:100k 闆昏矾鏁�(sh霉):1 婧害绯绘暩(sh霉):妯�(bi膩o)婧�(zh菙n)鍊� 150 ppm/°C 瀛樺劜(ch菙)鍣ㄩ鍨�:鏄撳け 鎺ュ彛:3 绶� SPI锛堣姱鐗囬伕鎿囷級 闆绘簮闆诲:1.8 V ~ 5.5 V 宸ヤ綔婧害:-40°C ~ 125°C 瀹夎椤炲瀷:琛ㄩ潰璨艰 灏佽/澶栨:8-VDFN 瑁搁湶鐒婄洡 渚涙噳(y墨ng)鍟嗚ō(sh猫)鍌欏皝瑁�:8-DFN-EP锛�3x3锛� 鍖呰:甯跺嵎 (TR) |
| AD5280BRUZ2002 | 鍒堕€犲晢:AD 鍒堕€犲晢鍏ㄧū:Analog Devices 鍔熻兘鎻忚堪:Single/Dual,15 V/5 V,256-Position I2C-Compatible Digital Potentiometer |
| AD5280BRUZ200-R7 | 鍔熻兘鎻忚堪:IC POT DGTL 200K 256POS 14TSSOP RoHS:鏄� 椤炲垾:闆嗘垚闆昏矾 (IC) >> 鏁�(sh霉)鎿�(j霉)閲囬泦 - 鏁�(sh霉)瀛楅浕浣嶅櫒 绯诲垪:- 妯�(bi膩o)婧�(zh菙n)鍖呰:3,000 绯诲垪:DPP 鎺ョ墖:32 闆婚樆锛堟瓙濮嗭級:10k 闆昏矾鏁�(sh霉):1 婧害绯绘暩(sh霉):妯�(bi膩o)婧�(zh菙n)鍊� 300 ppm/°C 瀛樺劜(ch菙)鍣ㄩ鍨�:闈炴槗澶� 鎺ュ彛:3 绶氫覆琛岋紙鑺墖閬告搰锛岄仦澧�锛屽/娓涳級 闆绘簮闆诲:2.5 V ~ 6 V 宸ヤ綔婧害:-40°C ~ 85°C 瀹夎椤炲瀷:琛ㄩ潰璨艰 灏佽/澶栨:8-WFDFN 瑁搁湶鐒婄洡 渚涙噳(y墨ng)鍟嗚ō(sh猫)鍌欏皝瑁�:8-TDFN锛�2x3锛� 鍖呰:甯跺嵎 (TR) |
| AD5280BRUZ200-R72 | 鍒堕€犲晢:AD 鍒堕€犲晢鍏ㄧū:Analog Devices 鍔熻兘鎻忚堪:Single/Dual,15 V/5 V,256-Position I2C-Compatible Digital Potentiometer |
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