參數(shù)資料
型號(hào)： LTC6242CGN
廠商： LINEAR TECHNOLOGY CORP
元件分類(lèi)： 運(yùn)動(dòng)控制電子
英文描述： Dual/Quad 18MHz, Low Noise, Rail-to-Rail, CMOS Op Amps
中文描述： QUAD OP-AMP, 275 uV OFFSET-MAX, 18 MHz BAND WIDTH, PDSO16
封裝： 0.150 INCH, PLASTIC, SSOP-16
文件頁(yè)數(shù)： 19/24頁(yè)
文件大小： 490K
代理商： LTC6242CGN
LTC6241/LTC6242
19
62412f
APPLICATIU
Low Noise Shock Sensor Amplifiers
Figures 9 and 10 show the LTC6241 realizing two different
approaches to amplifying signals from a capacitive sensor.
The sensor in both cases is a 770pF piezoelectric shock
sensor accelerometer, which generates charge under
physical acceleration.
Figure 9 shows the classical “charge amplifier” approach.
The LTC6241 is in the inverting configuration so the sensor
looks into a virtual ground. All of the charge generated
by the sensor is forced across the feedback capacitor
by the op amp action. Because the feedback capacitor
is 100 times smaller than the sensor, it will be forced to
100 times what would have been the sensor’s open circuit
voltage. So the circuit gain is 100. The benefit of this ap-
proach is that the signal gain of the circuit is independent
of any cable capacitance introduced between the sensor
and the amplifier. Hence this circuit is favored for remote
W
U
U
BIAS RESISTOR
VISHAY-TECHNO
CRHV2512AF1007G
(OR EQUIVALENT)
MAIN
GAIN-SETTING
ELEMENT IS A
CAPACITOR
SHOCK SENSOR
MURATA-ERIE
PKGS-00LD
770pF
CABLE HAS
UNKNOWN C
R
f
1G
6241 F09
V
OUT
= 110mV/g
–
+
1/2
LTC6241
C
f
7.7pF
Figure 9. Classical Inverting Charge Amplifier
accelerometers where the cable length may vary. Difficulties
with the circuit are inaccuracy of the gain setting with the
small capacitor, and low frequency cutoff due to the bias
resistor working into the small feedback capacitor.
Figure 10 shows a non-inverting amplifier approach. This
approach has many advantages. First of all, the gain is set
accurately with resistors rather than with a small capaci-
tor. Second, the low frequency cutoff is dictated by the
bias resistor working into the large 770pF sensor, rather
than into a small feedback capacitor, for lower frequency
response. Third, the non-inverting topology can be paral-
leled and summed (as shown) for scalable reductions in
voltage noise. The only drawback to this circuit is that the
parasitic capacitance at the input reduces the gain slightly.
This circuit is favored in cases where parasitic input
capacitances such as traces and cables will be relatively
small and invariant.
BIAS RESISTOR
VISHAY-TECHNO
CRHV2512AF1007G
(OR EQUIVALENT)
1G
V
S+
6241 F10
10k
1k
1k
100
V
OUT
= 110mV/g
V
±
1.4V to
±
5.5V
BW = 0.2Hz to 10kHz
V
OUT
–
+
1/2
LTC6241HV
V
S–
10k
100
–
+
1/2
LTC6241HV
SHOCK SENSOR
MURATA-ERIE
PKGS-00LD
770pF
Figure 10. Low Noise Non-Inverting Shock Sensor Amplifier
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