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Table 4-1.
Operating Mode
AM/FM/Weather Channel
Standby
FM
AM
Weather band
Bit 93
0
0
1
1
Bit 92
0
1
0
1
Bit 63
X
0
1
1
Bit 62
X
0
1
0
4.2
Test Mode
A special test mode is implemented for final production test only. This mode is activated by set-
ting bit 9 = 1. This mode is not intended to be used in customer applications. For normal
operation, bit 9 has to be set to 0. Bit 22 to bit 30 are deactivated in normal operation mode.
Table 4-2.
Test Mode
Mode
Normal operation
Test mode
Bit 9
0
1
4.3
VCO/Local Oscillator Prescaler
An oscillator circuit is implemented to build a VCO as proposed in the application schematic. The
VCO frequency is used to generate the LO frequency of the 1 st mixer stages. The control voltage
of the VCO is usually generated by the PLL circuit U4256BM. The VCO frequency has a range
of 70 MHZ to 250 MHz to allow the reception of all analog world bands.
A main element of the implemented oscillator circuit is a bipolar NPN transistor. The internally
biased base is connected to pin 13 and the emitter to pin 14. An AGC circuit (bit 30) can be acti-
vated to increase the emitter current until the appropriate oscillation level is reached. The
fundamental emitter current can be changed by bit 52.
Table 4-3.
Local Oscillator AGC
Local Oscillator (VCO)
AGC off (default)
AGC on
Bit 30
0
1
Table 4-4.
Local Oscillator Gain
Local Oscillator (VCO)
Low Gain
High Gain
Bit 52
0
1
In addition (to the AM prescaler) a special VCO prescaler is implemented for all modes (AM, WB
and FM). The divider factor of the prescaler buffer provides the signal of the buffered output (at
pin 16) and the prescaler VCO provides the signal of the 1 st FM mixer stage and AM prescaler.
Examples of VCO prescaler settings are described in section “Application Information” on page
29 . The divider factor of the VCO and buffer prescaler can be selected according Table 4-5 on
page 7 .
6
ATR4258
4838B–AUDR–05/05
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