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參數資料
| 型號： | AD526AD |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 運動控制電子 |
| 英文描述： | Software Programmable Gain Amplifier |
| 中文描述： | INSTRUMENTATION AMPLIFIER, 700 uV OFFSET-MAX, 4 MHz BAND WIDTH, CDIP16 |
| 封裝： | HERMETIC SEALED, SIDE BRAZED, CERAMIC, DIP-16 |
| 文件頁數： | 11/14頁 |
| 文件大?。?/td> | 464K |
| 代理商： | AD526AD |
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
μ
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
V
OUT
0.1
m
F
–V
S
0.1
m
F
+V
S
V
IN
16
15
14
13
12
11
10
9
1
2
3
4
5
6
7
8
+
–
AD526
16
8
4
2
1
GAIN NETWORK
A1
A0
LOGIC AND LATCHES
CS
CLK
A2
B
20k
V
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
–V
S
0.1
m
F
+V
S
V
IN
16
15
14
13
12
11
10
9
1
2
3
4
5
6
7
8
+
–
AD526
16
8
4
2
1
GAIN NETWORK
A1
A0
LOGIC AND LATCHES
CS
CLK
A2
B
HOS-100
0.01
m
F
0.1
m
F
0.01
m
F
R
L
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
μ
V per LSB of adjustment,
which guarantees dc accuracy to the 16-bit performance level.
OUT
OUT
V
OUT
0.1
m
F
–V
S
0.1
m
F
+V
S
V
IN
AAD587
+10V
V
REF
16
15
14
13
12
11
10
9
1
2
3
4
5
6
7
8
+
–
AD526
16
8
4
2
1
GAIN NETWORK
A1
A0
LOGIC AND LATCHES
CS
CLK
A2
B
7.5M
V
3.3M
V
AD548
+
0.01
m
F
0.01
m
F
–
+V
S
–V
S
ALL BYPASS CAPACITORS ARE 0.1
m
F
AD7524
GND
10
m
F
1k
V
OUT 1
OUT 2
+V
S
MSB
LSB
CS
WR
Figure 41. Offset Nulling Using a DAC
相關PDF資料 |
PDF描述 |
|---|---|
| AD526B | Software Programmable Gain Amplifier |
| AD526BD | Software Programmable Gain Amplifier |
| AD526C | Software Programmable Gain Amplifier |
| AD526CD | 10 Bit, 40MSPS ADC, 1.8V, Int/Ext Ref, w/Power-Down 48-TQFP -40 to 85 |
| AD526J | Software Programmable Gain Amplifier |
相關代理商/技術參數 |
參數描述 |
|---|---|
| AD526ADZ | 功能描述:IC AMP PGA 10MA 16CDIP RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標準包裝:2,500 系列:- 放大器類型:通用 電路數:4 輸出類型:- 轉換速率:0.6 V/µs 增益帶寬積:1MHz -3db帶寬:- 電流 - 輸入偏壓:45nA 電壓 - 輸入偏移:2000µV 電流 - 電源:1.4mA 電流 - 輸出 / 通道:40mA 電壓 - 電源，單路/雙路(±):3 V ~ 32 V，±1.5 V ~ 16 V 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:14-TSSOP（0.173"，4.40mm 寬） 供應商設備封裝:14-TSSOP 包裝:帶卷 (TR) 其它名稱:LM324ADTBR2G-NDLM324ADTBR2GOSTR |
| AD526B | 制造商:AD 制造商全稱:Analog Devices 功能描述:Software Programmable Gain Amplifier |
| AD526BD | 功能描述:IC AMP PGA 10MA 16CDIP RoHS:否 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標準包裝:2,500 系列:Excalibur™ 放大器類型:J-FET 電路數:1 輸出類型:- 轉換速率:45 V/µs 增益帶寬積:10MHz -3db帶寬:- 電流 - 輸入偏壓:20pA 電壓 - 輸入偏移:490µV 電流 - 電源:1.7mA 電流 - 輸出 / 通道:48mA 電壓 - 電源，單路/雙路(±):4.5 V ~ 38 V，±2.25 V ~ 19 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-SOIC（0.154"，3.90mm 寬） 供應商設備封裝:8-SOIC 包裝:帶卷 (TR) |
| AD526BDZ | 功能描述:IC AMP PGA 10MA 16CDIP RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標準包裝:2,500 系列:- 放大器類型:通用 電路數:4 輸出類型:- 轉換速率:0.6 V/µs 增益帶寬積:1MHz -3db帶寬:- 電流 - 輸入偏壓:45nA 電壓 - 輸入偏移:2000µV 電流 - 電源:1.4mA 電流 - 輸出 / 通道:40mA 電壓 - 電源，單路/雙路(±):3 V ~ 32 V，±1.5 V ~ 16 V 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:14-TSSOP（0.173"，4.40mm 寬） 供應商設備封裝:14-TSSOP 包裝:帶卷 (TR) 其它名稱:LM324ADTBR2G-NDLM324ADTBR2GOSTR |
| AD526C | 制造商:AD 制造商全稱:Analog Devices 功能描述:Software Programmable Gain Amplifier |
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