HT9142 Detector Datasheet

HT9142 Datasheet, PDF, Equivalent


Part Number

HT9142

Description

FM IF Detector

Manufacture

Holtek Semiconductor

Total Page 7 Pages
Datasheet
Download HT9142 Datasheet


HT9142
HT9142
FM IF Detector
Features
· Operating voltage: 1.1V~3.5V
· Constant power supply voltage can be generated 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 conversion
method
· Mixer operating frequency: 10MHz~50MHz
· Built-in low-pass filter and waveform shaping circuit
enable the extraction of FSK signals from voice sig-
nals
· Built-in battery-saving function for longer battery life
time
· High transmission rate: 1200 bps
· 20-pin TSSOP package (0.65mm Pitch)
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 customer¢s
PAGER system with total solution along with Holtek¢s
POCSAG Pager Controller series products.
The HT9142 can also use on Holtek¢s RF key-
board/mouse applications.
Block Diagram
M IX I G N D R E G O R E G C
A LM
.SKO
C H G B S LP .O LP .I
M ix e r
REG .
A LA R M
.SK
CO M P.
Q u ic k
C h a rg e
AM P
I. A m p
O S C Q uad D et
O S C I O S C O M IX O V C C
I. IN D E C
Pin Assignment
O SCI
O SCO
M IX O
VCC
I. IN
DEC
.SKR
I. O
Q UAD
A.O
1 2 0 M IX I
2 19 G N D
3 18 R E G O
4 17 R E G C
5 16 A LM
6 15 .S K O
7 14 C H G
8 13 B S
9 12 LP .O
10 11 LP .I
H T9142
2 0 T S S O P -A
. S K R I. O Q U A D A . O
Rev. 1.00
1 January 30, 2002

HT9142
HT9142
Pin Description
Pin No. Pin Name I/O
Description
1 OSCI
I
These pins are connected to the external parts of an oscillating circuit.
2 OSCO O
3 MIXO
O Mixer output pin. Connect a 455kHz ceramic filter between this pin and the IFIN pin.
4 VCC
¾ Positive power supply
5 IFIN
I Input terminal for IF Amp.
6 DEC
I Bias Decoupling
7 FSKR
I
Reference input of differential amplifier for waveform shaping. Connect the capacitor
externally.
8 IFO
O IF Amplifier Output pin. Connect the discriminator through the coupling capacitor.
9 QUAD
I
FM demodulator phase shift input pin connected to a quadrature detector phase
shifter.
10 AFO
O FM demodulator output pin
11 LPFI
I Low Pass Filter Input pin
12 LPFO
O Low Pass Filter Output pin
13 BS
Battery-saving Control pin
I ²H² Normal Operation
²L² Battery-saving
14 CHG
Control pin for quick charge-discharge circuit.
I ²H² turn on quick charge-discharge
²L² turn off quick charge-discharge
15 FSKO
O FSK NRZ data output
16 ALM
17 REGC
Output pin for Low Voltage Alarm
O At VCC@1.1V, this pin becomes ²H² (@VCC) and can indicate deterioration of battery.
O
Control pin of external transistor for regulator of external power supply.
Externally connect the PNP transistor
18 REGO
O Output voltage monitoring pin of regulator for external power supply.
19 GND
¾ Negative power supply, ground
20 MIXI
I MIXER Input terminal
Absolute Maximum Ratings
Power Supply Voltage........................VCC-0.3V to 4.0V
Operating Temperature range.....................0°C to 45°C
Power Dissipation..............................................730mW
Storage Temperature ............................-55°C to 150°C
Note: These are stress ratings only. Stresses exceeding the range specified under ²Absolute Maximum Ratings² 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 reliabil-
ity.
Rev. 1.00
2 January 30, 2002


Features HT9142 FM IF Detector Features · Opera ting voltage: 1.1V~3.5V · Constant pow er supply voltage can be generated by e xternally adding a transistor: VREG=1.0 V typ. · Alarm function sensitivity: V ALM=1.1V typ. · Low current consumptio n: ICCQ=1.1mA typ. · Built-in 2nd stag e mixer for double conversion method · Mixer operating frequency: 10MHz~50MHz · Built-in low-pass filter and wavef orm shaping circuit enable the extracti on of FSK signals from voice signals · Built-in battery-saving function for l onger battery life time · High transmi ssion rate: 1200 bps · 20-pin TSSOP pa ckage (0.65mm Pitch) General Descripti on The HT9142 is designed for FM commun ication system devices. It combines a p aging system, mixer, IF limiter, Quadra ture detector, operation amplifier, com parator and more. The HT9142 could prov ide the customer¢s PAGER system with total solution along with Holtek¢s POC SAG Pager Controller series products. T he HT9142 can also use on Holtek¢s RF keyboard/mouse applications. Block D.
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