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参数资料
| 型号： | OM5610 |
| 厂商： | NXP SEMICONDUCTORS |
| 元件分类： | 调谐器 |
| 英文描述： | Matchbox global FM tuner |
| 中文描述： | 1-BAND, AUDIO TUNER, XMA12 |
| 文件页数： | 3/16页 |
| 文件大小： | 80K |
| 代理商： | OM5610 |
1997 Apr 25
3
Philips Semiconductors
Preliminary specification
Matchbox global FM tuner
OM5610
PINNING
FUNCTIONAL DESCRIPTION
The OM5610 is an integrated FM stereo radio circuit
including digital tuning and control functions.
The radio
The radio circuit incorporates a tuned RF stage, a double
balanced mixer, a one-pin oscillator and is designed for
distributed IF ceramic filters. The FM quadrature detector
uses a ceramic resonator.
The PLL stereo decoder incorporates a signal dependent
stereo-blend circuit and a soft-mute circuit.
Tuning
The tuning-concept of Self Tuned Radio (STR) is based on
FUZZY LOGIC: it mimics hand tuning (hand tuning is a
combination of coarse and fine tuning to the qualitatively
best frequency position). As a consequence the tuning
system is very fast.
The tuning algorithm, which is controlled by a sequential
circuit, is completely integrated; so there are only a few
external components needed.
The bus and the microcontroller can be kept very simple.
The bus only consists of three wires (CLCK, DATA and
WREN). The microcontroller must basically give two
instructions:
Preset operation
Search operation.
PIN
DESCRIPTION
1
2
3
4
5
6
7
8
9
10
11
12
ground
ground
WREN
CLCK
STEREO
DATA
supply voltage (+5 V)
supply voltage (+12 V)
audio right output
ground
audio left output
MPX-RDS
P
RESET OPERATION
In preset mode, the microcontroller has to load information
such as frequency band, frequency and mono/stereo. This
information has to be sent via the bus to the tuner.
The internal algorithm controls the tuning sequence as
follows:
1.
The information is loaded into a shift register, a
last-station memory and the counter.
2.
The Automatic Frequency Control (AFC) is
switched-off.
3.
The counter starts counting the frequency and the
tuning voltage is varied until the real frequency roughly
equals the desired frequency.
4.
The AFC is then switched on and the real frequency is
more precisely tuned to the actual IF frequency.
5.
After the AFC has tuned the real frequency to the
desired frequency an in-lock signal is generated; then
the counter is switched off. In order to get a reliable
in-lock signal, there are two parameters measured: the
field strength and the S-curve.
6.
The field strength indicates the strength of the station
and by looking at the S-curve the system can detect an
in-lock situation.
In the event of fading or pulling the in-lock signal becomes
logic 0 and the synthesizer will be switched on again
(maintaining last station) and the algorithm will be
repeated.
S
EARCH OPERATION
During a search operation, the only action the
microcontroller has to take is: sending the desired band
plus the direction and the search sensitivity level to the
tuner. The search operation is performed by the charge
pump until an in-lock signal is generated (combination of
measuring the field strength and the S-curve). By looking
at the S-curve the system can distinguish false in-locks
from real in-locks (false in-locks occur on the wrong slope
of the S-curve). The AFC then fine tunes to the station.
The frequency of the found station will be counted by the
counter and written into the last-station memory and the
shift register of the counter. At this time the frequency is
available in the shift register and can be read by the
microcontroller. The microcontroller decides whether the
frequency is within the desired frequency band. If so, this
frequency can be stored under a preset and if not, a new
search action should be started.
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