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PDF BA4424N Data sheet ( Hoja de datos )
| Número de pieza | BA4424N | |
| Descripción | FM / TV front end | |
| Fabricantes | ROHM Semiconductor | |
| Logotipo |  |
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Audio ICs
FM / TV front end
BA4424N
The BA4424N is a monolithic IC designed for FM front end use. It consists of an RF amplifier circuit, mixer circuit, local
oscillation circuit, IF buffer amplifier, and a variable capacitor-diode for AFC.
FFeatures
1) An RF amplifier, mixer, local oscillator, IF buffer am-
plifier, and AFC diode are included on-chip.
2) Reception of VHF terrestrial TV channels is possible.
3) Uses a double balance mixer to improve intermo-
dulation characteristics.
4) Includes a clamp diode in the mixer output.
5) Local oscillation buffer on-chip for improved re-
sponse to strong input.
6) The output impedance of the IF buffer amplifier is
matched with the ceramic filter impedance at 330Ω.
FAbsolute maximum ratings (Ta = 25_C)
7) A resistive load can also be used for the mixer out-
put.
8) Mixer input coupling capacitor included on-chip.
9) Includes a feedback capacitor for the local oscilla-
tion circuit.
10) Compact 9-pin SIP package. Pins arranged for
convenient mounting.
FRecommended operating conditions (Ta = 25_C)
48
1 page  
Audio ICs
FOperation notes
(1) Application circuit
The example application circuit is the one which we rec-
ommend, however, when using it, verify characteristics
carefully.
If external circuit values are changed, set them with suffi-
cient margin to allow for deviations of both the Rohm IC
and external components in the quiescent and transient
characteristics. Also, please note that we have not com-
pletely verified any possible patent issues which the ap-
plication circuit may involve.
(2) Operating power supply voltage range
As long as the operating power supply voltage range is
not exceeded, the circuit functions are guaranteed within
the ambient operating temperature. Although we cannot
guarantee that the electrical characteristic values rated
under the rating conditions will be obtained, there will be
no abrupt changes in the characteristics within this
range.
(3) RF amplifier
A band pass filter (BPF) is used in the ANT circuit, and
as the RF amplifier is base-grounded, a BPF with an out-
put impedance of 75Ω must be used. If a BPF without DC
cutoff is used, a coupling capacitor will be necessary.
Connect the bypass capacitor to the ground connection
of the input BPF. The pattern connecting these should be
such that supply current will absolutely not flow from Pin
5 (the ground line should be laid in the same fashion as
shown in the measurement circuit schematic).
BA4424N
(4) Mixer load
In addition to an IFT, a resistive load can also be used for
the mixer output load. However, take care in this case as
the gain and intermodulation characteristics will be af-
fected.
(5) Local oscillation circuit
To reduce spurious radiation, the oscillation level at Pin
8 (OSC) can be adjusted. This is done by adding a resis-
tor (several Ω to several tens of Ω) between Pin 8 and the
tank circuit. However, when setting the value, take care
regarding the oscillation margin as related to the tank cir-
cuit Q damp.
(6) IF buffer amplifier
If the buffer amplifier pin is connected to another circuit
to use the buffer amplifier pin’s voltage, take care that a
reverse voltage never appears at the pin.
(7) Power supply RC filter
Do not insert a resistor between the VCC pin (Pin 9) and
the MIX OUT pins (Pins 3 and 4), as a resistor inserted
in the power supply line will decrease sensitivity due to
the drop in the voltage. Regarding the resistor between
Pin 9 and the RFout pin (Pin 3), set the value so that the
voltage at Pin 3 is not lower than the voltage at Pin 2.
52
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| Páginas | Total 7 Páginas | |
| PDF Descargar | [ Datasheet BA4424N.PDF ] | |
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