HT9142 Detector Datasheet
FM IF Detector
|Total Page||7 Pages|
FM IF Detector
· 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
· Mixer operating frequency: 10MHz~50MHz
· Built-in low-pass filter and waveform shaping circuit
enable the extraction of FSK signals from voice sig-
· Built-in battery-saving function for longer battery life
· High transmission rate: 1200 bps
· 20-pin TSSOP package (0.65mm Pitch)
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-
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1 January 30, 2002
Pin No. Pin Name I/O
These pins are connected to the external parts of an oscillating circuit.
2 OSCO O
O Mixer output pin. Connect a 455kHz ceramic filter between this pin and the IFIN pin.
¾ Positive power supply
I Input terminal for IF Amp.
I Bias Decoupling
Reference input of differential amplifier for waveform shaping. Connect the capacitor
O IF Amplifier Output pin. Connect the discriminator through the coupling capacitor.
FM demodulator phase shift input pin connected to a quadrature detector phase
O FM demodulator output pin
I Low Pass Filter Input pin
O Low Pass Filter Output pin
Battery-saving Control pin
I ²H² Normal Operation
Control pin for quick charge-discharge circuit.
I ²H² turn on quick charge-discharge
²L² turn off quick charge-discharge
O FSK NRZ data output
Output pin for Low Voltage Alarm
O At VCC@1.1V, this pin becomes ²H² (@VCC) and can indicate deterioration of battery.
Control pin of external transistor for regulator of external power supply.
Externally connect the PNP transistor
O Output voltage monitoring pin of regulator for external power supply.
¾ Negative power supply, ground
I MIXER Input terminal
Absolute Maximum Ratings
Power Supply Voltage........................VCC-0.3V to 4.0V
Operating Temperature range.....................0°C to 45°C
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-
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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