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參數(shù)資料
| 型號(hào)： | TDA7361 |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | Low Voltage NBFM IF System(低壓NBFM IF系統(tǒng)) |
| 中文描述： | 低壓NBFM中頻系統(tǒng)如果系統(tǒng)（低壓NBFM） |
| 文件頁數(shù)： | 2/8頁 |
| 文件大?。?/td> | 178K |
| 代理商： | TDA7361 |
BLOCK DIAGRAM
PinFUNCTION
No
1-2
Name
Function
XTAL OSCILLATOR
Connections for the Colpitts XTAL Oscillator.
The XTAL may be replaced by an inductor (see Figure 5) if the application
does not require high stability.
The Mixer is double balanced to reduce spurious products. The output
impedance is 1.8kW to match the input impedance of a 455kHz ceramic filter.
Must be well decoupled with a 100nF ceramiccapacitor.
Input pin of thesix stages amplifier with about50
μ
V limiting sensitivity and
1.8k
input impedance. The if outputis connected to the external quadrature
coil (Pin 8) via an internal10pF capacitor.
Good quality 100nF ceramic capacitors and a suitable layou are important.
A quadrature detector is uded to demodulate the 455kHz FM signal. The Q of
the quad coil has direct effect on output level and distorsion (see Figure 6).
For proper operation the voltage shouldbe 100mV
RMS
.
The audio output signal is buffered by an internalemitter follower.
Because of the low DC bias, the swing on the operational amplifier output is
limited to 500mV
RMS
.
This can be increased by adding a resistor from the operational amplifier input
to ground.
The squelch trigger circuit with a low bias on the input (Pin 12) will force Pin
13 high ; and Pin 14 low.
Pulling Pin 12 above mute threshold (0.65V) will force Pin 13 to an impedance
of about 60k
to ground and Pin 14 will be an open circuit.
An hysteresis of about 50mV at Pin 12 will effectively prevent jitter.
Ground Connection
Input of the Wide-band Mixer. Normally used as 10MHz/455kHz converter, it
can be also used with input frequencies up to 60MHz.
3
MIXER OUT
4
5
SUPPLY VOLTAGE
IF LIMITER INPUT
6-7
8
DECOUPLING
QUADRATURE COIL
9
10
AUDIO OUTPUT SIGNAL
OPERATIONAL
AMPLIFIER INPUT
OPERATIONAL
AMPLIFIER OUTPUT
SQUELCH INPUT
11
12
13
SCAN CONTROL
14
15
16
MUTE
GND
10.7MHz MIXER INPUT
TDA7361
2/8
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