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PDF U4065B Data sheet ( Hoja de datos )
| Número de pieza | U4065B | |
| Descripción | FM Receiver IC | |
| Fabricantes | ATMEL Corporation | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de U4065B (archivo pdf) en la parte inferior de esta página. Total 34 Páginas | ||
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Features
• On-chip Control Functions are Available for System Gain Adjust
(dB Linear versus DC Current)
• Low Noise LO Design
• ESD Protected
Benefits
• All Front-end Functions of a High-performance FM Receiver Except the RF
Preamplifier are Integrated
• Improved Dynamic Range by High Current Double-balanced Mixer Design and a New
AGC Conception with 3 Loops On-chip
• Improved Blocking and Intermod Behavior Due to a Unique “Interference” Sensor
Controlling the AGC
• Easy Cascading of 3 IF Filters (Ceramic) Enabled by Two On-chip IF Preamplifiers
FM Receiver IC
U4065B
Description
The IC U4065B is a bipolar integrated FM front-end circuit. It contains a mixer, an
oscillator, two IF preamplifiers and an unique interference sensor. The device is
designed for high-performance car radio and home receiver applications.
Rev. 4807A–AUDR–05/04
1 page  
LOBUFF
GND1
Figure 3. Buffered Local Oscillator Output
23
+
50
1
ESD
1V
U4065B
The buffered local oscillator used for output, drives the FM input of the PLL circuit (for
example, U428xBM family). The typical parallel output resistance at 100 MHz is 70 Ω,
the parallel output capacitance is about 10 pF. When using an external load of 500 Ω/10
pF, the oscillator swing is about 100 mV. The second harmonic of the oscillator fre-
quency is less than -15 dBc.
Figure 4. Ground of the Second IF Amplifier
IF2OUT
4807A–AUDR–05/04
8
2 ESD
There is no internal connection to the other ground pins.
Figure 5. Output of the Second IF Amplifier
ESD
VS
3
VREF
The parallel output capacitance to ground is about 7 pF. The external load resistance
must be connected to VS. The DC current into the pin is typically 3 mA.
Note: The supply voltage VS has to be protected against IF distortion.
5
5 Page 
LOE
LOB
Figure 18. Emitter of the Local Oscillator
23
ESD
U4065B
An external capacitor is connected between LOE and ground. The ground pin of this
capacitor must be connected to pin GND5, the chip-internal ground of the local
oscillator.
Figure 19. Base of the Local Oscillator
24
ESD
The tank of the local oscillator is connected at pin LOB. The ground pin of this tank
needs to be connected to pin GND5, the chip-internal ground of the local oscillator’s
pin 24. The resonant resistance of the tank should be about 250 Ω. Minimum Q of the
unloaded tank is 50.
4807A–AUDR–05/04
11
11 Page | ||
| Páginas | Total 34 Páginas | |
| PDF Descargar | [ Datasheet U4065B.PDF ] | |
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