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ZN428
BIPOLAR ADJUSTMENT PROCEDURE
(i) Set all bits to OFF (low) with ENABLE low and adjust
offset until the amplifier output reads -full-scale.
(ii) Set all bits ON (high) and adjust gain until the
amplifier output reads +(full-scale - 1LSB).
BIPOLAR SETTING UP POINTS
1LSB = 2FS
256
Input Range,
±
FS
LSB
-FS
+(FS -
1LSB)
±
5V
39.1 mV
-5.0000V
+4.9609V
±
10V
78.1mV
-10.0000V
9.9219V
Fig.10 Bipolar operation - component values
BIPOLAR LOGIC CODING
Input Code
(Offset Binary)
Analog Output
(Nominal Value)
11111111
11111110
11000000
10000001
10000000
01111111
01000000
00000001
00000000
+(FS - 1LSB)
+(FS - 2 LSB)
+
1
/
2
FS
+ 1LSB
0
-1 LSB
-
1
/
2
FS
-(FS - 1LSB)
-FS
HEADQUARTERS OPERATIONS
GEC PLESSEY SEMICONDUCTORS
Cheney Manor, Swindon,
Wiltshire, United Kingdom. SN2 2QW
Tel: (0793) 518000
Fax: (0793) 518411
GEC PLESSEY SEMICONDUCTORS
P.O. Box 660017,
1500 Green Hills Road,
Scotts Valley, California 95067-0017,
United States of America.
Tel (408) 438 2900
Fax: (408) 438 5576
CUSTOMER SERVICE CENTRES
FRANCE & BENELUX
Les Ulis Cedex Tel: (1) 64 46 23 45 Fax: (1) 64 46 06 07
GERMANY
Munich Tel: (089) 3609 06-0 Fax: (089) 3609 06-55
ITALY
Milan Tel: (02) 66040867 Fax: (02)66040993
JAPAN
Tokyo Tel: (03) 5276-5501 Fax: (03) 5276-5510
NORTH AMERICA
Scotts Valley, USA Tel: (408) 438 2900 Fax: (408) 438 7023
SOUTH EAST ASIA
Singapore Tel: (65) 3827708 Fax: (65) 3828872
SWEDEN
Stockholm Tel: 46 8 702 97 70 Fax: 46 8 640 47 36
TAIWAN, ROC
Taipei Tel: 886 2 5461260 Fax: 886 2 7190260
UK, EIRE, DENMARK, FINLAND & NORWAY
Swindon Tel: (0793) 518510 Fax: (0793) 518582
These are supported by Agents and Distributors in major countries world-wide.
GEC Plessey Semiconductors 1994 Publication No. DS3007 Issue No. 2.1 August 1994
TECHNICAL DOCUMENTATION - NOT FOR RESALE. PRINTED IN UNITED KINGDOM
This publication is issued to provide information only which (unless agreed by the Company in writing) may not be used, applied or reproduced for any purpose nor form part of any order or contract nor to be
regarded as a representation relating to the products or services concerned. No warranty or guarantee express or implied is made regarding the capability, performance or suitability of any product or service. The