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PDF AS1716 Data sheet ( Hoja de datos )
| Número de pieza | AS1716 | |
| Descripción | Capacitive Sensor Interface | |
| Fabricantes | austriamicrosystems AG | |
| Logotipo |  |
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AS1716
Capacitive Sensor Interface
Datasheet
1 General Description
AS1716 is an analog front end specifically designed for
unbiased Capacitive Sensors, as for instance Knock
Sensors in Automotive, to be interfaced with Analog Dig-
ital Converters with Sample and Hold input stages.
The device provides differential inputs, a 1st order low
pass filter to cutoff the high frequency noise compo-
nents, differential to single ended conversion, program-
mable gain stage and a 2 pole low pass Multiple
Feedback Filter.
The Knock Sensor is a Piezo Electric device that gener-
ates a voltage if it is stressed. It senses knock and trans-
mits information to the electronic engine management
control unit. This influences process control in the
engine, for example timing and fuel injection until knock
is eliminated.
The capacitive sensor is biased via resistors to a voltage
level of VDDA/2.
2 Key Features
! Differential input stage with wide input range
! Resistive sensor biasing (VDDA/2)
! Programmable Gain (x0.5, x1, x2, x4)
! Internal 2nd order low pass Multiple Feedback Filter
with a min. cut off frequency of 16kHz
! Single supply operation: 4.5V to 5.5V
! Operating Temperature range: -40°C to +125°C
! High CMRR: 55dB (min)
! EMC characterized by IEC 61967-4
(1Ω / 150Ω Method)
! EMC characterized by IEC 62132-4
(Direct Power Injection)
! Automotive qualified to AECQ100 for IC and PPAP
level 3
! 8-pin SOIC Package
Figure 1. AS1716 Block Diagram
3 Applications
Analog front end for Capacitive Sensors to Analog to
Digital Converters and DSP.
VDDA VSSA NC
INN
VDDA
+
-
-
+
VDDA/2
VDDA/2
INP
AS1716
-
+
VDDA/2
Gain Control
x0.5, x1, x2, x4
-
+
VDDA/2
-
+
Multiple Feedback LP Filter
fc ~23kHz typ.
VDDA/2
OUT
GA GB
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Revision 1.00
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1 page  
AS1716
Datasheet - Electrical Characteristics
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Table 3. Electrical Characteristics (Continued)
Symbol
Parameter
AC Electrical Characteristics
Condition
Min Typ Max Unit
fC
Filter Cut-off Frequency
VDDA = 4.5V, GA = GB = 0, INP-INN =
1VPP, fIN = 16kHz and 29kHz
16
23
29 kHz
THD
Total Harmonic Distortion
VDDA = 5V, fIN = 1kHz, INP-INN = 8VPP,
Gain0.5
80
dB
VNOISE
RMS noise at OUT
Gain4, fC = 50Hz - 23kHz
1 mVRMS
1. Guaranteed by design
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Revision 1.00
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5 Page 
AS1716
Datasheet - Ordering Information
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11 Ordering Information
The device is available as the standard product shown in Table 5.
Table 5. Ordering Information
Ordering Code
AS1716A-ASOT
Marking
AS1716A
Description
Capacitive Sensor Interface, 16kHz
All devices are RoHS compliant and free of halogene substances.
Delivery Form
Tape and Reel
Package
8-pin SOIC
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Revision 1.00
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| PDF Descargar | [ Datasheet AS1716.PDF ] | |
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