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Preliminary
7-43
RF2689
Rev A4 010815
7
Mode Control
Logic
Mode Control Truth Table
Auto Calibration Mode
The filters are automatically tuned when the CALEN pin goes high. The filters are reset to a nominal value whenever the
CALEN pin goes low. The auto calibration circuitry is independent of the “Mode A/B” and the EN RX control pins.
The EN RX and CALEN pins can be connected together if desired.
Truth Table
EN RX
Chip Enable
If EN =0 then the whole IC is powered down
Mode
EN RX
Mode B
Mode A
Power Down
0
X
X
GSM/DCS RX Warm-Up
1
0
1
GSM/DCS RX
1
1
1
W-CDMA RX Warm-Up
1
0
0
W-CDMA RX
110
Mode
W-CDMA
Input Amp
GSM Input Amp
&1st Mixer
Fixed
Divider
GSM
Divider
Second
Dividers
VGA
Demod
Baseband
& Filters
Power Down
0
0
0
0000
0
GSM/DCS RX Warm-Up
0
0
1
(div 2)
0
(div 2)
0
(div 12)
00
0
GSM/DCS RX
0
1
1
(div 2)
1
(div 2)
1
(div 12)
11
1
(250kHz)
W-CDMA RX Warm-Up
0
0
1
(div 2)
01
(div 4)
00
0
W-CDMA RX
1
0
1
(div 2)
00
(div 4)
11
1
(2.5MHz)
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