U3600BM Datasheet, PDF (19/43 Pages) ATMEL Corporation – SINGLE CHIP CORDLESS TELEPHONE IC

U3600BM
Channel Frequencies,
Dividers and Country
Settings
To meet all requirements of various countries – France (F), Spain (E), Netherlands (NL),
USA, Portugal (P), Taiwan, New Zealand and Korea – and modes – base (b), handset
(h) – several bits have to be set which do not change for the different channels. These
settings are called country settings.
• The country-setting bits contain:
• Rough adjustments for 2 VCOs
• Setting three integer divider in the mixer PLL and modulator PLL
• Conversion gain adjustment of mixer PLL
• Modulator gain
• Setting of the pulling direction of PLL2 (value dependent, if TX frequency is higher
or lower than LO frequency)
• Demodulator gain
Name Register
Function
Notes
RA1[1:0]
Rough adjust VCO1
00: is the highest frequency
RA2[1:0]
Rough adjust VCO2
00: is the highest frequency
D1[1:0]
Integer divider D1
Division by 2, 4, 6, 8
D20
Integer divider D2
Division by 6, 8
M12
Integer divider M12
Doubles reference frequency of
PLL2 when set to “1”
D3[1:0]
Integer divider D3
Division by 1, 2, 4
KV[3:1]
Conversion gain VCO2
GMOD[1:0]
Modulator gain
00: gain minimal
IMIXI
Reverse inputs of PC of PLL
0: if fVCO2 lower than fVCO3
DR1[1:0]
FRMT
Additional divider M for reference
frequency f_Ref1
Frequency range
Mixer T
“0” means no reduction, >0 only
necessary in E, NL, Portugal
0: output frequency < 5 MHz
GDEM
Demodulator gain
0: high gain
1: low gain
Note: Setting the fractional dividers:
For N, Q_M, send the binary equivalent of the numbers given below.
For P_M (integer part of modulator PLL), send the D2 complement (16 – P_M)
i.e., Fb1 (P_M = 7, Q_M = 159 => integer: send 16 –P_M = 9, fractional: send 159)
Number of
Positions
3
4
4
2
2
3
6
3
2
4
2
2
19
4516C–CT0–08/02