Proposed
RF2722
Receiver Configuration Register 3 (CRX3) - Address 100010
Programming Bits
CRX3(11:10)
# of Bits
reserved
DC_TIME1
Defaults
00
Description
Reserved
CRX3(9:2)
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
CRX4(11:10)
# of Bits
reserved
DC_TIME2
Defaults
00
Description
Reserved
CRX4(9:0)
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
CRX5(11:9)
CRX5(8:6)
# of Bits
Gain_Cal
Reserved
Reserved
LNA_CURR
Defaults
011
Description
I/Q Gain Calibration
000
Reserved
CRX5(5:4)
00
Reserved
CRX5(3:2)
10
These bits control the LNA current as shown below.
Low Band
11mA
12.8mA
14.6mA
16.4mA
High Band
13.2mA
15mA
16.9mA
18.7mA
00
01
10
11
CRX5(1:0)
MIX_CURR
10
These bits control the Mixer current as shown below.
00
01
10
11
12.5mA
13.5mA
14.4mA
15.6mA
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
001
010
011
100
101
LNA1 (US/GSM)
LNA2 (US/GSM)
LNA3 (DCS/PCS)
LNA4 (DCS/PCS)
All LNA’s off
All LNA’s off
CF(12)
VCOHL
F_G1
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)
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=11.6dB0001=12.6dB0010=13.6dB0011=14.6dB
0100=15.6dB0101=16.6dB0110=17.6dB0111=18.7dB
1000=3.5dB1001=4.5dB1010=5.5dB1011=6.5dB
1100=7.5dB1101=8.5dB1110=9.5dB1111=10.5dB
CF(7:6)
C_G1
11
Selects the coarse input attenuation setting of the first pole of the filter.
00=-13dB01=N/A10=-5.5dB11=0dB
7628 Thorndike Road, Greensboro, NC 27409-9421 · For sales or technical
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22 of 26
Rev A4 DS050919
RFMD [ RF MICRO DEVICES ]
