AS1702/03/04/05
Demoboard Application Note
austriamicrosystems
General Description
Jumper Description
Mark
A
B
C
D
E
Jumper
J16
J17
Av
SHDN
SHDM
Description
R
IN
of IN-
R
IN
of IN+
Gain of the Amplifier*
Shutdown
Shutdown Mode
Set
R
IN
disabled
R
IN
disabled
Av = 2
or
Av = 4
Not Set
R
IN
enabled
R
IN
enabled
For AS1703/04/05 only
Not recommended
Load = 0Ohm
Shutdown Mode enabled,
F
J7
Output Impedance
*) Gain settings only applicable for AS1702
or
Normal Operation enabled
Load = 8Ohm
Load = 4Ohm
Measurement Points Description
Mark
G
H
I
J
Pin
J14
J15
J6
J5
Description
Ground
Measurement Point of BIAS-GND
Measurement Point of OUT+
Measurement Point of OUT-
Input/Output Description
Mark
K
L
M
N
O
P
Connector Description
VCC
GND
IN+
IN-
OUT+
OUT-
Power Supply Connectors for VCC
and GND.
Input Connectors for differential
signal source.
Outputs Connectors.
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Revision 1.00
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AS1702/03/04/05
Demoboard Application Note
austriamicrosystems
Circuit
Starting Up
Soldered Chip
The AS1702/3/4/5 demo board is designed to work with the
AS1702, AS1703, AS1704 and the AS1705. Before using the
Demoboard please make sure which chip is on the board and set
the Jumpers appropriate if necessary. The marking of the chip can
be found printed on the IC soldered on the board.
Per default an AS1702 is mounted on the Demoboard
Two different Jumper settings are necessary, one for the AS1702
and another for the AS1703/04/05.
If an
AS1703, AS1704, AS1705
is soldered, set the following jumpers:
Mark
A
B
C
D
E
F
Jumper
J16
J17
Av
SHDN
SHDM
J7
Description
R
IN
of IN-
R
IN
of IN+
Gain of the Amplifier
Shutdown
Shutdown Mode
Output Impedance
Jumper Set
SET
SET
NOT SET
SET
(2 values possible)
SET
(2 values possible)
OPTIONAL
(3 values possible)
Value
R
IN
= 0kOhm
R
IN
= 0kOhm
Gain of IC. See datasheet.
VDD/GND
VDD/GND
Load = 0 / 4 / 8Ohm
If an
AS1702
is soldered, set the following jumpers:
Mark
A
B
C
D
E
F
Jumper
J16
J17
Av
SHDN
SHDM
J7
Description
R
IN
of IN-
R
IN
of IN+
Gain of the Amplifier
Shutdown
Shutdown Mode
Output Impedance
Jumper Set
NOT SET
NOT SET
SET
(2 values possible)
SET
(2 values possible)
SET
(2 values possible)
OPTIONAL
(3 values possible)
Value
R
IN
= 75kOhm
R
IN
= 75kOhm
Av = 2 / 4 (6dB / 12dB)
VDD/GND
VDD/GND
Load = 0 / 4 / 8Ohm
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Revision 1.00
3-4
AS1702/03/04/05
Demoboard Application Note
austriamicrosystems
Operational sequence
1.
2.
3.
−
−
4.
5.
6.
If not present get the datasheet for the AS1702/03/04/05 from
www.austriamicrosystems.com.
Drive the IC on the Demoboard
only with the recommended settings and values as described in the datasheet.
Make sure which IC is soldered on the Demoboard.
Set Jumper as described above.
Choose an output impedance.
Choose the gain.
Connect a 2.7 to 5.5V power supply (VDD and GND).
Connect a
differential
signal source. For example differential sinus signal.
Measure on the measuring points J6(OUT+) and J5(OUT-) and J15(BIAS-GND).
Note:
It’s possible to connect headphones or speakers (4Ohm or 8Ohm Impedance) to the outputs. Make sure the onboard Output
Impedance is set to 0Ohm with removing Jumper J7 (F).
Have fun using the Demoboard. If there are questions do not hesitate to contact us. See contact information below.
Copyright
Copyright © 2005 austriamicrosystems. Trademarks registered ®. All rights reserved. The material herein may not be reproduced,
adapted, merged, translated, stored, or used without the prior written consent of the copyright owner. To the best of its knowledge,
austriamicrosystems asserts that the information contained in this publication is accurate and correct.
Contact Information
Headquarters:
austriamicrosystems AG
Standard Linear
A 8141 Schloss Premstätten, Austria
T. +43 (0) 3136 500 0
F. +43 (0) 3136 5692
info@austriamicrosystems.com
For Sales Offices, Distributors and Representatives, please visit:
www.austriamicrosystems.com
www.austriamicrosystems.com
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