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HT9142 Datasheet

  • HT9142

  • FM IF Detector

  • 8頁

  • ETC

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HT9142
FM IF Detector
Features
路
Operating voltage: 1.1V~3.5V
路
Constant power supply voltage can be generated by
路
Built-in low-pass filter and waveform shaping circuit
externally adding a transistor: V
REG
=1.0V typ.
路
Alarm function sensitivity: V
ALM
=1.1V typ.
路
Low current consumption: I
CCQ
=1.1mA typ.
路
Built-in 2nd stage mixer for double conversion
enable the extraction of FSK signals from voice sig-
nals
路
Built-in battery-saving function for longer battery life
time
路
High transmission rate: 1200 bps
路
20-pin TSSOP package (0.65mm Pitch)
method
路
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 customer壟s
PAGER system with total solution along with Holtek壟s
POCSAG Pager Controller series products.
The HT9142 can also use on Holtek壟s RF key-
board/mouse applications.
Block Diagram
M IX I G N D
R E G O
R E G C
A L M
. S K O
C H G
B S
L P . O
L P . I
R E G .
M ix e r
A L A R M
. S K
C O M P .
Q u ic k
C h a rg e
A M P
I. A m p
O S C
Q u a d D e t
O S C I O S C O
M IX O
V C C
I. IN
D E C
. S K R
I. O
Q U A D
A . O
Pin Assignment
O S C I
1
2
3
4
5
6
7
8
9
1 0
O S C O
M IX O
V C C
I. IN
D E C
. S K R
I. O
Q U A D
A . O
2 0
1 9
1 8
1 7
1 6
1 5
1 4
1 3
1 2
1 1
M IX I
G N D
R E G O
R E G C
A L M
. S K O
C H G
B S
L P . O
L P . I
H T 9 1 4 2
2 0 T S S O P -A
Rev. 1.10
1
July 31, 2002

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