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參數(shù)資料
| 型號： | HT9011 |
| 廠商： | Holtek Semiconductor Inc. |
| 英文描述： | FM IF Detector |
| 中文描述： | 調(diào)頻中頻探測器 |
| 文件頁數(shù)： | 5/7頁 |
| 文件大小： | 98K |
| 代理商： | HT9011 |
HT9011
5
March 1, 2000
Preliminary
Functional Description
Battery-saving function
The battery-saving function is controlled by the
pin BS and the battery consumption is mini-
mized by reducing the current consumption. If
the pin is logic LOW, the HT9011 enters the
battery-saving mode, otherwise HT9011 is in
normal operation state.
FSK NRZ output
The HT9011 has two built-in operation amplifi-
ers. One of these operation amplifiers is con-
nected inside the IC to the NRZ comparator.
The NRZ comparator can output the input sig-
nal waveform as a square wave. The NRZ com-
parator output is an open collector. If the IC
interfaces with CMOS devices, the possible con-
nection is shown below.
Quick charge-discharge circuit
If an FSK signal inputs during the brief transi-
tion from battery-saving state to normal opera-
tion state, the time that the pin FSKR arrives
at the reference voltage is delayed by a time
constantdeterminedbythecapacitorconnected
to the pin
FSKR
and the internal resistor.
Sometimes, the output signal becomes errone-
ous due to some error in the comparator input
voltage. Such a case could be avoided by quickly
charging or discharging the capacitor con-
nected to the pin FSKR . By using the quick
charge-discharge circuit, the delay time for the
FSKR pin to be of the same level with the
LPFO pin could be minimized, hence, errone-
ous FSK NRZ output signal is prevented.
Battery low alarm function
In case the HT9011 is battery powered, when
thepowersupplyvoltagegoeslowtoabout1.1V,
the output of the pin ALM rises up to about
1.1V and the battery voltage can be monitored
by other devices. The output is an open collector
similar to FSK NRZ output.
Constant voltage regulator for external part
power supply
Externally connecting the transistor as shown
in the figure below, the output REGO could be
used constantly as 1.0V regulator output. At
the battery-saving mode, the regulator is
turned OFF .
Local oscillator circuit
The HT9011 local oscillator circuit is of Colpitts
type oscillator composed of internal emitter fol-
lower circuit and an external X tal. The transis-
tor is connected externally as shown in the
figure below. Resistor R may be needed to in-
crease the current of the local oscillator circuit
in order to compose the overtone oscillator and
improve its stability. It is recommended that
the resistor be connected between OSCI and
REGO to provide battery-saving mode.
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