chAMP - iNDTact Data Sheet

iNDTelect chAMP 1.1
2-channel low noise wide-band charge amplier
iNDTact GmbH
©
2014-2015
Date: April 16, 2015
1.2 Applications
1 Summary
Amplication / buering of sensor signals
1.1 Features
Preamplication for ADC
Low noise signal conditioning
Type
Channels
Gain
...
...
...
Bandwidth
...
Lower Corner Freq.
Upper Corner Freq.
Output Resistance
Output Voltage
Supply Voltage
...
...
...
...
...
Active ltering
Charge Amplier
2
Variable
-40dB to 40dB
0,01 - 100mV/pC
Bandpass (20dB/decade)
Variable Frequencies
>1.6mHz
< 2.1MHz
≤ 200Ω
±5V
12-36V
1.3 Description
The chAMP 1.1 is a extremly low noise but wide
bandwith charge amplier. It oers two congurable
channels. The gain can be set independently for each
channel. The amplier chAMP 1.1 is designed specically for iNDTact sensors and allows easy and exible
signal conditioning.
1
chAMP 1.1
Contents
Contents
1
2
Summary
1
1.1
1.2
1.3
1
1
1
Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Adjustable Settings
2.1
2.2
Amplication . . . . . .
Bandpass . . . . . . . .
Lower Corner Frequency
Upper Corner Frequency
3
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3
3
3
3
3
Parametertable for Sensor iMPactXS
4
4
Parametertable for µepsS
5
5
Revision History
6
6
Disclaimer Of Warranty
6
2
chAMP 1.1
2
ADJUSTABLE SETTINGS
2 Adjustable Settings
The gain as well as the upper and lower corner frequencies of the chAMP 1.1 can be adjusted independendly.
216 combinations per channel are possible. The optimum settings can be determined by the use of the
according tables. If non-suitable settings are used the occurrence of poles within the transfer function can
be observed. This leads to a non-linear transfer function but does not inuence the function of the amplier.
Some combinations of the connected sensor and chosen settings lead to unwanted oscillations. In this case
you have to choose other settings.
2.1 Amplication
The amplication can be adjusted stepwise from -40dB to +40dB with 20dB steps (refer to table 1). The
setting 60dB is refered as maximum amplication. The maximum amplication depends on the used sensor.
Setting
Amplication [mV/pC]
-40dB
-20dB
0dB
20dB
40dB
60dB
0,01
0,1
1
10
100
300 1000
Table 1: Amplication Settings
2.2 Bandpass
The amplier can be used as an analog bandpass lter by adjusting the lower and upper corner frequency
independendly. Note: If the upper corner frequency is set below the lower corner frequency the overall
amplication decreases.
Lower Corner Frequency
The lower corner frequency depends on the connected sensor and the chosen amplication. The variation
of the lower corner frequency can be used to reduce environmental noise (eg. vibrations) and prevents the
amplier from clipping.
You can nd an overview of the settings on page 3 and following.
Upper Corner Frequency
As well as the lower corner frequency the upper frequency depends on the connected sensor and chosen
amplication. The adjustment can be used to avoid high-frequency noise (eg. from mechanical or electrical
sources).
You can nd an overview of the settings on page 3 and following.
3
chAMP 1.1
3
PARAMETERTABLE FOR SENSOR IMPACTXS
3 Parametertable for Sensor iMPactXS
Upper corner frequency settings for iMPactXS
XXX
XXX
Freq high
Gain
XXX
1
2
3
4
5
6
-40dB
-20dB
0dB
20dB
40dB
MAX
16Hz
160Hz
1,6kHz
16kHz
160kHz
16Hz
160Hz
1,6kHz
16kHz
160kHz
Pole@4MHz
Pole@4MHz
16Hz
160Hz
1,6kHz
16kHz
160kHz
2,1MHz
16Hz
160Hz
1,6kHz
16kHz
130kHz
670kHz
16Hz
160Hz
1,6kHz
13kHz
54kHz
78kHz
16Hz
160Hz
1,6kHz
9,6kHz
21kHz
23kHz
XX
Lower corner frequency settings for iMPactXS
XXX
XXX
Freq low
1
2
3
4
5
6
Gain
XXX
XX
-40dB
-20dB
0dB
20dB
40dB
MAX
1,6mHz
16mHz
160mHz
1,6Hz
16Hz
160Hz
16mHz
160mHz
1,6Hz
16Hz
160Hz
1,6kHz
160mHz
1,6Hz
16Hz
160Hz
1,6kHz
16kHz
1,6Hz
16Hz
160Hz
1,6kHz
16kHz
140kHz
16Hz
160Hz
1,6kHz
14kHz
80kHz
53Hz
520Hz
4,4kHz
25kHz
Pole@110kHz
Pole@350kHz
Pole@350kHz
6 0
G a in
G a in
G a in
G a in
G a in
G a in
V e rs tä rk u n g [d B ]
4 0
= -4 0
= -2 0
= 0 d B
= 2 0 d
= 4 0 d
= M A
d B
d B
B
B
X (5 0 d B )
2 0
0
-2 0
-4 0
1 m
1 0 m
1 0 0 m
1
1 0
1 0 0
1 k
1 0 k
1 0 0 k
1 M
1 0 M
F re q u e n z [H z ]
Figure 1: Transfer function with iMPactXS and dierent amplications. The corner frequencies are chosen
for maximum bandwidth, therefore the lower frequency is set to switch position 1 and the upper
frequency is set to switch position 6. Note the pole occurrence at low amplications and high
frequencies.
4
chAMP 1.1
4
PARAMETERTABLE FOR µEPSS
4 Parametertable for µepsS
Upper corner frequency settings for µepsS
XXX
XXX
Freq high
Gain
XXX
1
2
3
4
5
6
-40dB
-20dB
0dB
20dB
40dB
MAX
530Hz
5,3kHz
53kHz
750kHz
530Hz
5,3kHz
53kHz
530kHz
530Hz
5,3kHz
53kHz
530kHz
Pole@10MHz
Pole@10MHz
Pole@10MHz
530Hz
5,3kHz
53kHz
530kHz
5,0MHz
560Hz
5,3kHz
52kHz
470kHz
1,8MHz
Pole@10MHz
Pole@10MHz
Pole@10MHz
Pole@4MHz
Pole@1,3MHz
630Hz
5,4kHz
50kHz
350kHz
880kHz
960kHz
XX
Lower corner frequency settings for µepsS
XXX
XXX
Freq low
1
2
3
4
5
6
Gain
XXX
XX
-40dB
-20dB
0dB
20dB
40dB
MAX
1,9mHz
19mHz
190mHz
1,9Hz
19Hz
190Hz
16mHz
160mHz
1,6Hz
16Hz
160Hz
1,6kHz
160mHz
1,6Hz
16Hz
160Hz
1,6kHz
16kHz
1,6Hz
16Hz
160Hz
1,6kHz
16kHz
150kHz
18Hz
180Hz
1,8kHz
18kHz
170kHz
55Hz
550Hz
5,5kHz
58kHz
Pole@720kHz
Pole@1,8MHz
Pole@1,5MHz
6 0
G a in
G a in
G a in
G a in
G a in
G a in
V e rs tä rk u n g s fa k to r [d B ]
4 0
= -4 0
= -2 0
= 0 d B
= 2 0 d
= 4 0 d
= M A
d B
d B
B
B
X (5 0 d B )
2 0
0
-2 0
-4 0
1 m
1 0 m
1 0 0 m
1
1 0
1 0 0
1 k
1 0 k
1 0 0 k
1 M
1 0 M
F re q u e n z [H z ]
Figure 2: Transfer function with µepsS and dierent amplications. The corner frequencies are chosen for
maximum bandwidth, therefore the lower frequency is set to switch position 1 and the upper
frequency is set to switch position 6. Note the pole occurrence at low amplications and high
frequencies.
5
chAMP 1.1
6
DISCLAIMER OF WARRANTY
5 Revision History
Revision
B
Date
02/15
A
06/14
Change
Product image
Language
Document created.
Description
Added
Translated into english
6 Disclaimer Of Warranty
The chAMP 1.1 is designed for test purposes only. Any use of the chAMP 1.1 other than for the purpose
intended excludes iNDTact GmbH from any possible liability.
6

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