RF2722_1 Datasheet, PDF (22/26 Pages) RF Micro Devices – GSM/GPRS/EDGE RECEIVER

RF2722
Proposed
Receiver Configuration Register 3 (CRX3) - Address 100010
Programming Bits
# of Bits Defaults Description
CRX3(11:10)
reserved
00
Reserved
CRX3(9:2)
DC_TIME1
20H Sets the number of 26MHz/16 clock cycles from activation until the RF2722 DCOC
system is frozen.
CRX3(1:0)
reserved
00
Reserved
Receiver Configuration Register 4 (CRX4) - Address 100011
Programming Bits
# of Bits Defaults Description
CRX4(11:10)
reserved
00
Reserved
CRX4(9:0)
DC_TIME2
124H
Sets the number of 26MHz/16 clock cycles from activation until the LNA’s and/or
the RX T/R switch are reactivated.
Receiver Configuration Register 5 (CRX5) - Address 100100
Programming Bits
# of Bits Defaults Description
CRX5(11:9)
Gain_Cal
011
I/Q Gain Calibration
CRX5(8:6)
Reserved
000
Reserved
CRX5(5:4)
Reserved
00
Reserved
CRX5(3:2)
LNA_CURR
10
These bits control the LNA current as shown below.
Low Band High Band
00 11mA
13.2 mA
01 12.8mA
15 mA
10 14.6mA
16.9 mA
11 16.4mA
18.7 mA
CRX5(1:0)
MIX_CURR
10
These bits control the Mixer current as shown below.
00
12.5 mA
01
13.5 mA
10
14.4 mA
11
15.6 mA
Polyphase Filter Gain Register (CF) - Address 100101
Programming Bits
# of Bits Defaults Description
CF(17)
TX_HL
0
If programmed low, enables Cellular/GSM TX buffer. If programmed high, enables
PCS/DCS TX buffer.
CF(16)
TX_EN
0
If TX_SEL is set false, TX buffers are controlled by this bit.
CF(15:13)
LNA_SEL
101
Selects the active LNA.
000
LNA1 (US/GSM)
001
LNA2 (US/GSM)
010
LNA3 (DCS/PCS)
011
LNA4 (DCS/PCS)
100
All LNA’s off
101
All LNA’s off
CF(12)
VCOHL
0
If programmed low, divides the VCO by 2 and routes signal through
US Cellular/GSM filter path. If programmed high, the VCO signal is routed
through PCS/DCS filter path.
CF(11:8)
F_G1
0000
Selects the fine gain setting of the first pole of the filter. The gain in dB at the mid-
band (0Hz for DCR) is as shown below.
0000 = 11.6 dB0001 = 12.6 dB0010 = 13.6 dB0011 = 14.6 dB
0100 = 15.6 dB0101 = 16.6 dB0110 = 17.6 dB0111 = 18.7 dB
1000 = 3.5 dB1001 = 4.5 dB1010 = 5.5 dB1011 = 6.5 dB
1100 = 7.5 dB1101 = 8.5 dB1110 = 9.5 dB1111 = 10.5 dB
CF(7:6)
C_G1
11
Selects the coarse input attenuation setting of the first pole of the filter.
00 = -13 dB01 = N/A10 = -5.5 dB11 = 0 dB
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Rev A4 DS050919