參數(shù)資料
型號(hào)： TC1043
廠商： Microchip Technology Inc.
英文描述： Linear Building Block . Low Power Voltage Reference with Dual Op Amp, Dual Comparator, and Shutdown Mode
中文描述： 線性積木。低功耗電壓參考與雙路運(yùn)算放大器，雙比較，和關(guān)斷模式
文件頁(yè)數(shù)： 8/20頁(yè)
文件大小： 508K
代理商： TC1043
TC1043
DS21347B-page 8
2002 Microchip Technology Inc.
Capacitor C1 will charge up through R4. When the volt-
age at the comparator’s inverting input is equal to V
H
,
the comparator output will switch. With the output at
ground potential, the value at the non-inverting input
terminal (V
L
) is reduced by the hysteresis network to a
value given by:
EQUATION 4-7:
Using the same resistors as before, capacitor C1 must
now discharge through R4 toward ground. The output
will return to a high state when the voltage across the
capacitor has discharged to a value equal to V
L
. The
period of oscillation will be twice the time it takes for the
RC circuit to charge up to one-half its final value. The
period can be calculated from:
EQUATION 4-8:
The frequency stability of this circuit should only be a
function of the external component tolerances.
Figure 4-8 shows the circuit for a pulse width modulator
circuit. It is essentially the same as in Figure 4-7 with
the addition of an input control voltage. When the input
control voltage is equal to one-half V
DD
, operation is
basically the same as described for the free-running
oscillator. If the input control voltage is moved above or
below one-half V
DD
, the duty cycle of the output square
wave will be altered. This is because the addition of the
control voltage at the input has now altered the trip
points. The equations for these trip points are shown in
Figure 4-8 (see V
H
and V
L
).
Pulse width sensitivity to the input voltage variations
can be increased by reducing the value of R6 from
10k
and conversely, sensitivity will be reduced by
increasing the value of R6. The values of R1 and C1
can be varied to produce the desired center frequency.
4.8
Voice Band Receive Filter
The majority of spectral energy for human voices is
found to be in a 2.7kHz frequency band from 300Hz to
3kHz. To properly recover a voice signal in applications
such as radios, cellular phones, and voice pagers, a
low power bandpass filter that is matched to the human
voice spectrum can be implemented using MIcrochip’s
CMOS op amps. Figure 4-9 shows a unity gain multi-
pole Butterworth filter with ripple less than 0.15dB in
the human voice band. The lower 3dB cut-off frequency
is 70Hz (single order response), while the upper cut-off
frequency is 3.5kHz (fourth order response).
4.9
Supervisory Audio Tone (SAT)
Filter for Cellular
Supervisory Audio Tones (SAT) provide a reliable
transmission path between cellular subscriber units
and base stations. The SAT tone functions much like
the current/voltage used in land line telephone systems
to indicate that a phone is off the hook. The SAT tone
may be one of three frequencies: 5970, 6000 or
6030Hz. A loss of SAT implies that channel conditions
are impaired and if SAT is interrupted for more than 5
seconds a cellular call is terminated.
Figure 4-10 shows a high Q (30) second order SAT
detection bandpass filter using Microchip’s CMOS op
amp architecture. This circuit nulls all frequencies
except the three SAT tones of interest.
V
L
V
3
----------
=
FREQ
-------1
2 0.694
)
R4
(
)
C1
(
)
=
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TC1043CEQR 功能描述:校驗(yàn)器 IC VR/Op-Amp/Shtdwn RoHS:否 制造商:STMicroelectronics 產(chǎn)品: 比較器類(lèi)型: 通道數(shù)量: 輸出類(lèi)型:Push-Pull 電源電壓-最大:5.5 V 電源電壓-最小:1.1 V 補(bǔ)償電壓（最大值）:6 mV 電源電流（最大值）:1350 nA 響應(yīng)時(shí)間: 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SC-70-5 封裝:Reel
TC1043CEQRTR 功能描述:校驗(yàn)器 IC VR/Op-Amp/Shtdwn RoHS:否 制造商:STMicroelectronics 產(chǎn)品: 比較器類(lèi)型: 通道數(shù)量: 輸出類(lèi)型:Push-Pull 電源電壓-最大:5.5 V 電源電壓-最小:1.1 V 補(bǔ)償電壓（最大值）:6 mV 電源電流（最大值）:1350 nA 響應(yīng)時(shí)間: 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SC-70-5 封裝:Reel
TC1044 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:Charge Pump DC-TO-DC Voltage Converter
TC1044S 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:Charge Pump DC-TO-DC Voltage Converter
TC1044SCOA 功能描述:電荷泵 High Voltage RoHS:否 制造商:Maxim Integrated 功能:Inverting, Step Up 輸出電壓:- 1.5 V to - 5.5 V, 3 V to 11 V 輸出電流:100 mA 電源電流:1 mA 最大工作溫度:+ 70 C 封裝 / 箱體:SOIC-8 Narrow 封裝:Tube
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