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HT9142 FM IF Detector
Features
* Operating voltage: 1.1V~3.5V * Constant power supply voltage can be generated by * Built-in low-pass filter and waveform shaping circuit
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 conversion
enable the extraction of FSK signals from voice signals
* Built-in battery-saving function for longer battery life
time
* High transmission rate: 1200 bps * 20-pin TSSOP package (0.65mm Pitch)
method
* Mixer operating frequency: 10MHz~50MHz
General Description
The HT9142 is designed for FM communication system devices. It combines a paging system, mixer, IF limiter, Quadrature detector, operation amplifier, comparator and more. The HT9142 could provide the customers PAGER system with total solution along with Holteks POCSAG Pager Controller series products. The HT9142 can also use on Holteks RF keyboard/mouse applications.
Block Diagram
M IX I G N D REGO REGC ALM .SKO CHG BS LP.O LP.I
REG. M ix e r
ALARM
.SK COMP.
Q u ic k C h a rg e
AMP
I. A m p OSC Q uad Det
OSCIOSCO
M IX O
VCC
I. IN
DEC
.SKR
I. O
QUAD
A.O
Pin Assignment
OSCI 1 2 3 4 5 6 7 8 9 10 OSCO M IX O VCC I. IN DEC .SKR I. O QUAD A.O 20 19 18 17 16 15 14 13 12 11 M IX I GND REGO REGC ALM .SKO CHG BS LP.O LP.I
H T9142 2 0 T S S O P -A
Rev. 1.10
1
July 31, 2002
HT9142
Pin Description
Pin No. 1 2 3 4 5 6 7 8 9 10 11 12 13 Pin Name OSCI OSCO MIXO VCC IFIN DEC FSKR IFO QUAD AFO LPFI LPFO BS I/O I These pins are connected to the external parts of an oscillating circuit. O O 3/4 I I I O I O I O I Mixer output pin. Connect a 455kHz ceramic filter between this pin and the IFIN pin. Positive power supply Input terminal for IF Amp. Bias Decoupling Reference input of differential amplifier for waveform shaping. Connect the capacitor externally. IF Amplifier Output pin. Connect the discriminator through the coupling capacitor. FM demodulator phase shift input pin connected to a quadrature detector phase shifter. FM demodulator output pin Low Pass Filter Input pin Low Pass Filter Output pin Battery-saving Control pin H Normal Operation L Battery-saving Control pin for quick charge-discharge circuit. H turn on quick charge-discharge L turn off quick charge-discharge FSK NRZ data output Output pin for Low Voltage Alarm At VCC@1.1V, this pin becomes H (@VCC) and can indicate deterioration of battery. Control pin of external transistor for regulator of external power supply. Externally connect the PNP transistor Output voltage monitoring pin of regulator for external power supply. Negative power supply, ground MIXER Input terminal Description
14 15 16 17 18 19 20
CHG FSKO ALM REGC REGO GND MIXI
I O O O O 3/4 I
Absolute Maximum Ratings
Power Supply Voltage........................VCC-0.3V to 4.0V Operating Temperature range.....................0C to 45C Power Dissipation..............................................730mW Storage Temperature ............................-55C to 150C
Note: These are stress ratings only. Stresses exceeding the range specified under Absolute Maximum Ratings may cause substantial damage to the device. Functional operation of this device at other conditions beyond those listed in the specification is not implied and prolonged exposure to extreme conditions may affect device reliability.
Rev. 1.10
2
July 31, 2002
HT9142
Electrical Characteristics
Ta=25C, Unless oterwise specified, Fin (MIX)=21.7MHz, Fin(IF)=455kHz, Fdev=4kHz, Fin=600Hz Symbol Iccq Icco GMV IP R(MIX)in R(IF)in S/N1 S/N2 S/N3 Vi(LIM)1 Vi(LIM)2 VOD AMR DR VALM VALML IALM VFSKL IFSK VREC Parameter Quiescent Current Supply Current at Battery Saving MIXER Conversion Gain Test Conditions VDD 1.4V 1.4V 1.4V Conditions 3/4 3/4 3/4 3/4 3/4 3/4 Min. 3/4 3/4 9 3/4 3/4 3/4 3/4 3/4 3/4 3/4 3/4 30 3/4 40 1.05 3/4 3/4 3/4 3/4 3/4 3/4 3/4 0.95 Typ. 1.1 0 12.5 -10 5 2 63 63 25 14 23 45 50 50 1.1 3/4 3/4 3/4 3/4 1.0 Max. 1.6 5 16 3/4 3/4 3/4 3/4 3/4 3/4 3/4 27 60 3/4 60 1.15 0.4 2 0.4 2 1.05 Unit mA mA dB dBm kW kW dB dB dB dBmEMF dBmEMF mVrms dB % V V mA V mA V
MIXER 3rd Interception point 1.4V MIX Input Resistance IF Amp Input Resistance Signal to Noise Ration 1 Signal to Noise Ration 2 Signal to Noise Ration 3 -3dB Limiting Sensitivity 1 -3dB Limiting Sensitivity 2 Detected Output Level AM Rejection Ratio FSK OUT Duty Ratio Alarm Detected Voltage L Level Output Voltage (ALM) H Level Output Current (ALM) L Level Output Voltage (FSK) H Level Output Current (FSK) Constant Voltage Output 1.4V 1.4V
1.4V MIX IN, VIN (MIX)=60dBmEMF 1.4V IF IN, VIN (IF)=60dBmEMF 1.4V IF IN, VIN (IF)=22dBmEMF 1.4V MIX input 1.4V IF input 1.4V VIN (IF)=60dBmEMF 1.4V VIN (IF)=60dBmEMF AM=30%
1.4V VIN (IF)=60dBmEMF 1.4V 1.4V I=100mA 1.4V 1.4V I=100mA 1.4V 1.4V 3/4
Rev. 1.10
3
July 31, 2002
HT9142
Functional Description
Battery-saving function The battery-saving function is controlled by the pin BS and the battery consumption is minimized by reducing the current consumption. If the pin is logic LOW, the HT9142 enters the battery-saving mode, otherwise HT9142 is in normal operation state. FSK NRZ output The HT9142 has two built-in operation amplifiers. One of these operation amplifiers is connected inside the IC to the NRZ comparator. The NRZ comparator can output the input signal waveform as a square wave. The NRZ comparator output is an open collector. If the IC interfaces with CMOS devices, the possible connection is shown below.
1 .5 V 4 fo r C M O S IC
CC
Battery low alarm function In case the HT9142 is battery powered, when the power supply voltage goes low to about 1.1V, 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.
V re g V
CC
V
CC
+
V
1 .0 m .
2N3906
14
.SKO
C M O S IC
REGO
REGC
Local oscillator circuit The HT9142 local oscillator circuit is of Colpitts type oscillator composed of internal emitter follower circuit and an external Xtal. The transistor is connected externally as shown in the figure below. Resistor R may be needed to increase 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.
OSCI 1 REGO OSCO 2
Quick charge-discharge circuit If an FSK signal inputs during the brief transition from battery-saving state to normal operation state, the time that the pin FSKR arrives at the reference voltage is delayed by a time constant determined by the capacitor connected to the pin FSKR and the internal resistor. Sometimes, the output signal becomes erroneous due to some error in the comparator input voltage. Such a case could be avoided by quickly charging or discharging the capacitor connected 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, erroneous FSK NRZ output signal is prevented.
Rev. 1.10
4
July 31, 2002
HT9142
Application Circuits
Pager RF board (151.35MHz)
ANT 10p. 3p. V10P
M A111
10p. 15kW 18p. 5084 5084 47nH 10W 1000p. 0 .0 1 m .
3p. 47nH V40P 820nH 1kW 18p. 30kW 47nH 10p. 330kW 22p. 5084 82nH 1 .5 p . 1000p. 1000p. 1 .5 p . VB 31033 1000p. 1 .5 V + 22m. . o r D ic e C * = 1 0 p . .orP ackage C *=15p. C.W M 455. 3 C* C* 2 3
1
2p. VB
47W
VB
18p.
22p. 39nH 82kW 1 .5 k W 15p. 3 .3 m H 21M 15A 2 1 0 .1 m . 1000p. + 3 22m. 470W VB 0 .0 0 1 m .
22kW
2 0 .9 4 5 M H z
1
OSCI OSCO M IX O 4 5 6 7 VCC I. IN DEC .SKR 8 I. O 9 QUAD A.O
M IX I GND REGO REGC ALM .SKO CHG BS LP.O LP.I
20 19 18 17 16 15 14 13 12 11 4700p. 68kW 47kW 10kW BS1 0 .4 7 m . BAL DATA 47kW BS2 2N3906 B+ 1000p.
3
TP3 TP
0 .1 m .
4 5
1000p.
455C28 3 .3 k W
2
0 .1 m . 10m. + 22p.
10
H T9142
330p.
68kW 1500p.
TP TP3
68kW
Rev. 1.10
5
July 31, 2002
HT9142
RF mouse receiver
V 22kW 0 .0 1 m . 22kW 22kW V 1 15p. 2 3 4 4 7 m . /1 6 V 455E 1 3 4 5 2
10m.
CC
0 .0 1 m .
CC
2 7 .6 5 M H z
47p.
OSCI OSCO M IX O VCC 5 I. IN 6 7 DEC .SKR 8 I. O 9 QUAD A.O
M IX I GND REGO REGC ALM .SKO CHG BS LP.O LP.I
20 19 18 17
0 .0 1 m .
1 82p. 3 4 5 6 7 100kW 2 100kW 100kW 470p. 68kW 33p. 2
V
CC
15p.
16 15 14 13 12 11
0 .1 m .
EN ABLE ANT GND NC DATA GND VCC 7 M R X /M
0 .0 1 m .
47kW
455C28 3 .3 k W 47p. 22p.
10
H T9142
68kW
68kW
180p.
Rev. 1.10
6
July 31, 2002
HT9142
Package Information
20-pin TSSOP outline dimensions
20
11 E1
1
10
D A e B y A1 L A2 C
E
R
0 .1 0
L1
q
(4 C O R N E R S )
Symbol A A1 A2 B C D E E1 e L y q
Dimensions in mm Min. 1.05 0.05 0.95 3/4 0.13 6.40 6.30 4.30 3/4 0.45 3/4 0 Nom. 3/4 3/4 3/4 0.22 3/4 3/4 3/4 3/4 0.65 3/4 3/4 3/4 Max. 1.20 0.15 1.05 3/4 0.17 6.60 6.50 4.50 3/4 0.75 0.1 8
Rev. 1.10
7
July 31, 2002
HT9142
Holtek Semiconductor Inc. (Headquarters) No.3, Creation Rd. II, Science-based Industrial Park, Hsinchu, Taiwan Tel: 886-3-563-1999 Fax: 886-3-563-1189 http://www.holtek.com.tw Holtek Semiconductor Inc. (Sales Office) 11F, No.576, Sec.7 Chung Hsiao E. Rd., Taipei, Taiwan Tel: 886-2-2782-9635 Fax: 886-2-2782-9636 Fax: 886-2-2782-7128 (International sales hotline) Holtek Semiconductor (Shanghai) Inc. 7th Floor, Building 2, No.889, Yi Shan Rd., Shanghai, China Tel: 021-6485-5560 Fax: 021-6485-0313 http://www.holtek.com.cn Holtek Semiconductor (Hong Kong) Ltd. Block A, 3/F, Tin On Industrial Building, 777-779 Cheung Sha Wan Rd., Kowloon, Hong Kong Tel: 852-2-745-8288 Fax: 852-2-742-8657 Holmate Semiconductor, Inc. 46712 Fremont Blvd., Fremont, CA 94538 Tel: 510-252-9880 Fax: 510-252-9885 http://www.holmate.com Copyright O 2002 by HOLTEK SEMICONDUCTOR INC. The information appearing in this Data Sheet is believed to be accurate at the time of publication. However, Holtek assumes no responsibility arising from the use of the specifications described. The applications mentioned herein are used solely for the purpose of illustration and Holtek makes no warranty or representation that such applications will be suitable without further modification, nor recommends the use of its products for application that may present a risk to human life due to malfunction or otherwise. Holteks products are not authorized for use as critical components in life support devices or systems. Holtek reserves the right to alter its products without prior notification. For the most up-to-date information, please visit our web site at http://www.holtek.com.tw.
Rev. 1.10
8
July 31, 2002

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