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ZMD31050 Datasheet(PDF) 5 Page - Zentrum Mikroelektronik Dresden AG

Part No. ZMD31050
Description  Advanced Differential Sensor Signal Conditioner
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Maker  ZMD [Zentrum Mikroelektronik Dresden AG]
Homepage  http://www.zmdi.com
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Copyright © 2005, ZMD AG, Rev. 0.95, 2005-09-16
5/20
All rights reserved. The material contained herein may not be reproduced, adapted, merged, translated, stored, or used without the prior
written consent of the copyright owner. The Information furnished in this publication is preliminary and subject to changes without notice.
ZMD31050
Advanced Differential Sensor Signal Conditioner
Datasheet
PRELIMINARY
1.3
Analog Front End (AFE)
The analog front end consists of the programmable gain amplifier (PGA), the multiplexer (MUX) and
the analog-to-digital converter (ADC).
1.3.1.
Programmable Gain Amplifier
The following tables show the adjustable gains, the processable sensor signal spans and the allowed
common mode range.
No.
PGA
Gain aIN
Gain
Amp1
Gain
Amp2
Gain
Amp3
Max. span
VIN_SP in mV/V
Input range
VIN_CM in % VDDA
∗∗∗∗
1
420
30
7
2
2
43 - 57
2
280
30
4,66
2
3
40 - 59
3
210
15
7
2
4
43 - 57
4
140
15
4,66
2
6
40 - 59
5
105
15
3,5
2
8
38 - 62
6
70
7,5
4,66
2
12
40 - 59
7
52,5
7,5
3,5
2
16
38 - 62
8
35
3,75
4,66
2
24
40 - 59
9
26,3
3,75
3,5
2
32
38 - 62
10
14
1
7
2
50
43 - 57
11
9,3
1
4,66
2
80
40 - 59
12
7
1
3,5
2
100
38 - 62
13
2,8
1
1,4
2
280
21 - 76
Table 1: Adjustable gains, resulting sensor signal spans and common mode ranges
1.3.2.
Analog Sensor Offset Compensation - Analog Zero Point Shift (AZS)
The ZMD31050 supports two methods of sensor offset cancellation (zero shift):
• digital offset correction
• analog cancellation for large offset values (up to approx 300% of span)
Digital sensor offset correction will be processed at the digital signal correction/conditioning by the
CMC. Analog sensor offset pre-compensation will be needed for compensation of large offset values,
which would be overdrive the analog signal path by uncompensated gaining. For analog sensor offset
pre-compensation a compensation voltage will be added in the analog pre-gaining signal path (coarse
offset removal). The analog offset compensation in the AFE can be adjusted by 6 EEPROM bits. It
allows an Analog Zero Point Shift up to 300% of the processable signal span.
The zero point shift of the temperature measurements can also be adjusted by 6 EEPROM bits
(ZAZS= -25…+25) and is calculated by:
VAZS / VDDBR= k * ZAZS / ( 20 * aIN)
Bridge in voltage mode, refer “ZMD31050 Functional description” for usable input signal/common mode range at bridge in current mode




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