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| 型號： | AD524AE |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 13/28頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC AMP INST 1MHZ PREC LN 20CLCC |
| 產(chǎn)品變化通告： | Product Discontinuance 27/Oct/2011 |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 放大器類型： | 儀表 |
| 電路數(shù)： | 1 |
| 轉(zhuǎn)換速率： | 5 V/µs |
| 增益帶寬積： | 1MHz |
| -3db帶寬： | 1MHz |
| 電流 - 輸入偏壓： | 50nA |
| 電壓 - 輸入偏移： | 250µV |
| 電流 - 電源： | 3.5mA |
| 電壓 - 電源，單路/雙路(±)： | ±6 V ~ 18 V |
| 工作溫度： | -25°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 20-CLCC |
| 供應(yīng)商設(shè)備封裝： | 20-LCCC |
| 包裝： | 管件 |
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AD524
Rev. F | Page 20 of 28
PROGRAMMABLE GAIN
Figure 47 shows the AD524 being used as a software program-
mable gain amplifier. Gain switching can be accomplished with
mechanical switches such as DIP switches or reed relays. It should
be noted that the on resistance of the switch in series with the
internal gain resistor becomes part of the gain equation and has
an effect on gain accuracy.
The AD524 can also be connected for gain in the output stage.
Figure 48 shows an AD711 used as an active attenuator in the
output amplifier’s feedback loop. The active attenuation presents
very low impedance to the feedback resistors, therefore
minimizing the common-mode rejection ratio degradation.
TO –V
AD524
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
20k
404
4.44k
20k
40
PROTECTION
–IN
+IN
(+INPUT)
(–INPUT)
10k
10pF
20k
AD711
AD7590
GND
39.2k
28.7k
316k
1k
A4
A3
A2
WR
–VS
+VS
1F
35V
INPUT
OFFSET
NULL
+VS
OUTPUT
OFFSET
NULL
R2
10k
VOUT
+VS
–VS
VDD
VSS VDD
15
13
11
9
2
14
12
10
34
5
67
18
16
00
50
0-
04
8
+
–
+
–
Figure 48. Programmable Output Gain
2
1
10
6
AD524
DAC A
DB0
256:1
20k
G = 10
G = 100
G = 1000
4.44k
404
40
PROTECTION
20k
DAC B
DB7
AD7528
9
16
11
12
PROTECTION
3
13
RG1
RG2
Vb
+INPUT
(–INPUT)
–INPUT
(+INPUT)
VOUT
CS
WR
1/2
AD712
1/2
AD712
DATA
INPUTS
DAC A/DAC B
+VS
4
14
7
15
16
6
18
5
17
3
2
1
19
20
0050
0-
0
49
Figure 49. Programmable Output Gain Using a DAC
Another method for developing the switching scheme is to
use a DAC. The AD7528 dual DAC, which acts essentially as
a pair of switched resistive attenuators having high analog
linearity and symmetrical bipolar transmission, is ideal in this
application. The multiplying DAC’s advantage is that it can
handle inputs of either polarity or zero without affecting the
programmed gain. The circuit shown uses an AD7528 to set
the gain (DAC A) and to perform a fine adjustment (DAC B).
AUTOZERO CIRCUITS
In many applications, it is necessary to provide very accurate
data in high gain configurations. At room temperature, the
offset effects can be nulled by the use of offset trim potenti-
ometers. Over the operating temperature range, however,
offset nulling becomes a problem. The circuit of Figure 50
shows a CMOS DAC operating in bipolar mode and connected
to the reference terminal to provide software controllable offset
adjustments.
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| AD524AR | 制造商:Analog Devices 功能描述: |
| AD524AR16 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Amplifier. Other |
| AD524AR-16 | 功能描述:IC AMP INST 1MHZ PREC LN 16SOIC RoHS:否 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:Excalibur™ 放大器類型:J-FET 電路數(shù):1 輸出類型:- 轉(zhuǎn)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(yīng)商設(shè)備封裝:8-SOIC 包裝:帶卷 (TR) |
| AD524AR-16-REEL | 功能描述:IC AMP INST 1MHZ PREC LN 16SOIC RoHS:否 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:Excalibur™ 放大器類型:J-FET 電路數(shù):1 輸出類型:- 轉(zhuǎn)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(yīng)商設(shè)備封裝:8-SOIC 包裝:帶卷 (TR) |
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