AD524BDZ Analog Devices Inc, AD524BDZ Datasheet - Page 20

IC AMP INST 1MHZ PREC LN 16CDIP

AD524BDZ

Manufacturer Part Number
AD524BDZ
Description
IC AMP INST 1MHZ PREC LN 16CDIP
Manufacturer
Analog Devices Inc
Datasheet

Specifications of AD524BDZ

Amplifier Type
Instrumentation
Number Of Circuits
1
Slew Rate
5 V/µs
Gain Bandwidth Product
1MHz
-3db Bandwidth
1MHz
Current - Input Bias
25nA
Voltage - Input Offset
100µV
Current - Supply
3.5mA
Voltage - Supply, Single/dual (±)
±6 V ~ 18 V
Operating Temperature
-25°C ~ 85°C
Mounting Type
Through Hole
Package / Case
16-CDIP (0.300", 7.62mm)
No. Of Amplifiers
5
Input Offset Voltage
100µV
Gain Db Min
1dB
Bandwidth
25MHz
Amplifier Output
Single Ended
Cmrr
115dB
Supply Voltage Range
± 6V To ± 18V
Rohs Compliant
Yes
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Output Type
-
Current - Output / Channel
-
Lead Free Status / Rohs Status
RoHS Compliant part

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Company
Part Number
Manufacturer
Quantity
Price
Part Number:
AD524BDZ
Manufacturer:
VISHAY
Quantity:
3 971
Part Number:
AD524BDZ
Manufacturer:
ADI
Quantity:
835
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.
AD524
–V
+V
–IN
+IN
S
S
1µF
35V
OFFSET
(+INPUT)
(–INPUT)
INPUT
NULL
AD711
10kΩ
+V
–V
1
2
3
4
5
6
7
8
Figure 48. Programmable Output Gain
S
S
10pF
PROTECTION
PROTECTION
20kΩ
+
20kΩ
AD524
20kΩ
+
+V
20kΩ
13
11
15
9
S
V
3
DD
V
1
SS
A2
20kΩ
20kΩ
AD7590
4
V
A3
20kΩ
DD
8
5
A4
4.44kΩ
6
404Ω
GND
40Ω
16
WR
7
14
12
10
16
15
14
13
12
11
10
2
9
39.2kΩ
28.7kΩ
316kΩ
OUTPUT
OFFSET
NULL
R2
10kΩ
TO –V
V
1kΩ
1kΩ
1kΩ
OUT
Rev. F | Page 20 of 28
Another method for developing the switching scheme is to
use a DAC. The AD7528 dual DAC, which acts essentially as
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.
a pair of switched resistive attenuators having high analog
(–INPUT)
G = 1000
(+INPUT)
G = 100
+INPUT
–INPUT
G = 10
DAC A /DAC B
RG
RG
1
2
INPUTS
12
13
11
16
1
3
2
DATA
WR
Figure 49. Programmable Output Gain Using a DAC
CS
PROTECTION
PROTECTION
4.44kΩ
404Ω
40Ω
14
15
16
18
4
7
6
+V
DB0
DB7
S
17
AD7528
DAC A
DAC B
V
5
b
20kΩ
20kΩ
3
20kΩ
20kΩ
AD524
19
20
2
1
20kΩ
AD712
20kΩ
1/2
256:1
AD712
10
1/2
9
6
V
OUT

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