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AD102 Datasheet(PDF) 4 Page - Analog Devices

Part No. AD102
Description  General Purpose Input Isolation Amplifier
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Maker  AD [Analog Devices]
Homepage  http://www.analog.com
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AD102 Datasheet(HTML) 4 Page - Analog Devices

   
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REV. A
–4–
AD102/AD104
INSIDE THE AD102 AND AD104
The AD102 and AD104 use an amplitude modulation tech-
nique to exploit transmission of low frequency signal levels
through an isolation barrier produced by a signal transformer
including signals at a dc level (Figures 1 and 2). Additionally a
separate transformer is incorporated to provide power to the
isolated input port of the device. It is driven by a 25 kHz, 15 V
amplitude square wave generated internally by the AD102, sup-
plied externally for the AD104.
The device outputs are not buffered so the user may inter-
change output leads for signal inversion. In multichannel appli-
cations the outputs can be multiplexed with a single buffer
following the multiplexer to minimize offset errors while reduc-
ing power consumption and cost.
±5V
FS
SIGNAL
ICOM
PWR/CLK
COM
25kHz
POWER
DEMOD
AMPLIFIER
AND
MODULATOR
POWER
RECTIFIER
OSCILLATOR
FILTER
AD102
OUT H I
OUT LO
+15V DC
IN+
IN–
FB 3
6
5
4
9
1
7
2
Figure 1. AD102 Functional Block Diagram
±5V
FS
SIGNAL
ICOM
PWR/CLK
COM
25kHz
POWER
DEMOD
AMPLIFIER
AND
MODULATOR
POWER
RECTIFIER
FILTER
AD104
OUT H I
OUT LO
CLK IN
IN+
IN–
FB 3
6
5
4
9
1
8
2
Figure 2. AD104 Functional Block Diagram
USING THE AD102 AND AD104
Powering the AD102
The AD102 requires only a single +15 V DC power supply con-
nected as shown in Figure 3 to operate. A series 1.3 k
Ω resistor
and 1.0
µF capacitor are connected across the +15 V DC and
COMMON pins to aid in filtering power line variations.
1.0µF
AD102
1.3k
PWR/CLK
COM
+15VDC
7
2
Figure 3. AD102 Power Input
Powering the AD104
The AD104 requires its power in the form of a 15 V p-p,
25 kHz square wave from an external source as shown in Fig-
ure 4 (NOTE: pinout for AD246 clock driver shown).
2
8
AD104
AD104
2
8
2
8
AD104
15V p-p
@ 25kHz
2
13
12
+15VDC
PWR/CLK
COM
AD246
CLOCK DRIVER
1
Figure 4. Typical Multiple AD104 Connection
AD104 Clock Source
The AD246 clock driver designed to power the AD204 is a
clock driver that can be used to supply the required clock for the
AD104 from a +15 V DC supply (refer to the AD202/AD204
data sheet for AD246 specifications).
For designs where the lowest cost per channel approach is de-
sired, it is usually more cost efficient for designers to consider a
discrete onboard clock source such as the circuit shown in
Figure 5 (essentially an AD246).
180pF
12
9
8
7
4
1
3
2
10
2
4
7
5
6
3
TELEDYNE
TSC426
1N914
1N914
1µF
35V
+15V
CLK
OUT
CLK/PWR
COM
14
6
5
49.9k
C
RC
Q
R
CD4047B
Figure 5. Typical Clock Driver Circuit
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