|
|
PDF HT9011 Data sheet ( Hoja de datos )
| Número de pieza | HT9011 | |
| Descripción | FM IF Detector | |
| Fabricantes | Holtek Semiconductor Inc | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de HT9011 (archivo pdf) en la parte inferior de esta página. Total 7 Páginas | ||
|
No Preview Available !
Preliminary
HT9011
FM IF Detector
Features
· Operating voltage: 1.1V~3.5V
· Constant power supply voltage can be gen-
erated by externally adding a transistor:
VREG=1.0V typ.
· Alarm function sensitivity: VALM=1.1V typ.
· Low current consumption: ICCQ=1.1mA typ.
· Built-in 2nd stage mixer for double conver-
sion method
· Mixer operating frequency: 10MHz~50MHz
· Built-in low-pass filter and waveform shap-
ing circuit enable the extraction of FSK sig-
nals from voice signals
· Built-in battery-saving function for longer
battery life time
· High transmission rate: 1200 bps
· 20-pin SSOP package (0.65mm Pitch)
General Description
The HT9011 is designed for FM communication
system devices. It combines a paging system,
mixer, IF limiter, Quadrature detector, opera-
tion amplifier, comparator and more. The
HT9011 could provide the customer¢s PAGER
system with total solution along with Holtek¢s
POCSAG Pager Controller series products.
Block Diagram
M IX I G N D R E G O R E G C
A LM
FSKO
C H G B S LP FO LP FI
M ix e r
REG .
A LA R M
FSK
CO M P.
Q u ic k
C h a rg e
AM P
IF A m p
O S C Q uad D et
O S C I O S C O M IX O V C C
IF IN D E C
F S K R IF O Q U A D A F O
1 March 1, 2000
1 page  
Preliminary
HT9011
Functional Description
Battery-saving function
The battery-saving function is controlled by the
pin ²BS² 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.
V CC 4
1 .5 V
V C C fo r
C M O S IC
Battery low alarm function
In case the HT9011 is battery powered, when
the power supply voltage goes low to about 1.1V,
the output of the pin ²ALM² 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 ²REGO² could be
used constantly as 1.0V regulator output. At
the battery-saving mode, the regulator is
turned OFF .
V re g
V CC
+ 2N 3906
1 .0 m F
14
FSKO
C M O S IC
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 ²FSKR² arrives
at the reference voltage is delayed by a time
constant determined by the capacitor connected
to the pin ²FSKR² 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 ²FSKR². By using the quick
charge-discharge circuit, the delay time for the
²FSKR² pin to be of the same level with the
²LPFO² pin could be minimized, hence, errone-
ous FSK NRZ output signal is prevented.
REG O
REG C
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 ²R² 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.
O SCI
1
O SCO
2
REG O
22kW
56pF
2 1 .8 5 5 M H z
47pF R
5 March 1, 2000
5 Page | ||
| Páginas | Total 7 Páginas | |
| PDF Descargar | [ Datasheet HT9011.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| HT9011 | FM IF Detector | Holtek Semiconductor Inc |
| HT9015 | RF Single Chip for Cordless Phone | Holtek Semiconductor Inc |
| Número de pieza | Descripción | Fabricantes |
| SLA6805M | High Voltage 3 phase Motor Driver IC. |
 Sanken |
| SDC1742 | 12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters. |
 Analog Devices |
|
DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares, |
| DataSheet.es | 2020 | Privacy Policy | Contacto | Buscar |