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參數(shù)資料
| 型號(hào)： | AD526SD |
| 廠商： | Analog Devices Inc |
| 文件頁(yè)數(shù)： | 3/14頁(yè) |
| 文件大?。?/td> | 0K |
| 描述： | IC AMP PGA 10MA 16CDIP |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 放大器類型： | 可編程增益 |
| 電路數(shù)： | 1 |
| 轉(zhuǎn)換速率： | 24 V/µs |
| -3db帶寬： | 4MHz |
| 電流 - 輸入偏壓： | 50pA |
| 電壓 - 輸入偏移： | 250µV |
| 電流 - 電源： | 10mA |
| 電流 - 輸出 / 通道： | 10mA |
| 電壓 - 電源，單路/雙路(±)： | ±4.5 V ~ 16.5 V |
| 工作溫度： | -55°C ~ 125°C |
| 安裝類型： | 通孔 |
| 封裝/外殼： | 16-CDIP（0.300"，7.62mm） |
| 供應(yīng)商設(shè)備封裝： | 16-CDIP 側(cè)面銅焊 |
| 包裝： | 管件 |
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AD526
REV. D
–11–
OFFSET NULLING
Input voltage offset nulling of the AD526 is best accomplished
at a gain of 16, since the referred-to-input (RTI) offset is ampli-
fied the most at this gain and therefore is most easily trimmed.
The resulting trimmed value of RTI voltage offset typically
varies less than 3
V across all gain ranges.
Note that the low input current of the AD526 minimizes RTI
voltage offsets due to source resistance.
OUT
FORCE
OUT
SENSE
VOUT
0.1 F
–VS
0.1 F
+VS
VIN
16
15
14
13
12
11
10
9
12
34
56
78
+
–
AD526
16
84
21
GAIN NETWORK
A1
A0
CS CLK
A2
B
LOGIC AND LATCHES
20k
Figure 39. Offset Voltage Null Circuit
OUTPUT CURRENT BOOSTER
The AD526 is rated for a full
±10 V output voltage swing into
2 k
. In some applications, the need exists to drive more cur-
rent into heavier loads. As shown in Figure 40, a high current
booster may be connected “inside the loop” of the SPGA to
provide the required current boost without significantly degrad-
ing overall performance. Nonlinearities, offset and gain inaccu-
racies of the buffer are minimized by the loop gain of the
AD526 output amplifier.
OUT
FORCE
OUT
SENSE
–VS
0.1 F
+VS
VIN
16
15
14
13
12
11
10
9
12
34
56
78
+
–
AD526
16
84
21
GAIN NETWORK
A1
A0
CS CLK
A2
B
LOGIC AND LATCHES
HOS-100
0.01 F
0.1 F
0.01 F
RL
Figure 40. Current Output Boosting
CASCADED OPERATION
A cascade of two AD526s can be used to achieve binarily
weighted gains from 1 to 256. If gains from 1 to 128 are needed,
no additional components are required. This is accomplished by
using the B pin as shown in Figure 38. When the B pin is low,
the AD526 is held in a unity gain stage independent of the other
gain code values.
OFFSET NULLING WITH A D/A CONVERTER
Figure 41 shows the AD526 with offset nulling accomplished
with an 8-bit D/A converter (AD7524) circuit instead of the
potentiometer shown in Figure 39. The calibration procedure is
the same as before except that instead of adjusting the potenti-
ometer, the D/A converter corrects for the offset error. This
calibration circuit has a number of benefits in addition to elimi-
nating the trimpot. The most significant benefit is that calibra-
tion can be under the control of a microprocessor and therefore
can be implemented as part of an autocalibration scheme. Sec-
ondly, dip switches or RAM can be used to hold the 8-bit word
after its value has been determined. In Figure 42 the offset null
sensitivity, at a gain of 16, is 80
V per LSB of adjustment,
which guarantees dc accuracy to the 16-bit performance level.
OUT
FORCE
OUT
SENSE
VOUT
0.1 F
–VS
0.1 F
+VS
VIN
16
15
14
13
12
11
10
9
1
2
34
56
7
8
+
–
AD526
16
84
21
GAIN NETWORK
A1
A0
CS CLK
A2
B
LOGIC AND LATCHES
AD581 OR
AD587
+10V
VREF
7.5M
3.3M
AD548
0.01 F
–
+
+VS
–VS
ALL BYPASS CAPACITORS ARE 0.1 F
AD7524
GND
10 F
1k
OUT 1
OUT 2
+VS
MSB
LSB
CS
WR
Figure 41. Offset Nulling Using a DAC
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AD526SD/883B | 制造商:Analog Devices 功能描述:SP Amp Variable Gain Amp Single ±16.5V 16-Pin SBCDIP Tube 制造商:Rochester Electronics LLC 功能描述:SOFTWARE PROG. GAIN AMP - Bulk |
| AD526SD/883B/QUP-3/GDLS | 制造商:Rochester Electronics LLC 功能描述:AD526SD/883B/QUP-3/GDLS - Bulk |
| AD526SD883B | 制造商:AD 制造商全稱:Analog Devices 功能描述:Software Programmable Gain Amplifier |
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| AD5270BCPZ-100-RL7 | 功能描述:IC RHEOSTAT 5V 50-TP 1024 10CSP RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 數(shù)字電位器 系列:- 標(biāo)準(zhǔn)包裝:3,000 系列:DPP 接片:32 電阻（歐姆）:10k 電路數(shù):1 溫度系數(shù):標(biāo)準(zhǔn)值 300 ppm/°C 存儲(chǔ)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(yīng)商設(shè)備封裝:8-TDFN（2x3） 包裝:帶卷 (TR) |
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