Reconfigurable bits – Sundance SMT911 User Manual
Page 30
SMT911 User Manual SMT911
Page 30 of 38
Last Edited: 01/06/2010 10:09:00
This register is used to adjust the RX section and RSSI output.
Byte 1-0
D15 D14
D13
D12
D11
D10
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
Default
0
0
0
0
0
0
0
0
0
0
1
0
0
1
0
1
Reconfigurable bits:
Bit
Default
Description
12
0
Enable Rx VGA Gain Programming Serially. “0” = Rx VGA gain programmed with
external digital inputs (B7:B1); “1” = Rx VGA gain programmed with serial data bits in the
Rx gain register (D6:D0).
11
0
RSSI Output Range. “0” = low range (0.5V to 2V); “1” = high range (0.5V to 2.5V).
10
0
RSSI Operating Mode. “0” = RSSI disabled if RXHP = 0, and enabled if RXHP = 1;
“1” = RSSI enabled independent of RXHP
8
0
RSSI Pin Function. “0” = outputs RSSI signal in Rx mode; “1” = outputs temperature
sensor voltage in Rx, Tx and standby modes.
2
1
Rx high-pass -3dB Corner Frequency when RXHP = 0. “0” = 100Hz; “1” = 30kHz
This register allows the adjustment of the TX gain and linearity
Byte 1-0
D15 D14
D13
D12
D11
D10
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
Default
0
0
0
0
0
0
1
0
0
0
0
0
0
0
0
0
Reconfigurable bits:
Bit
Default
Description
10
0
Enable Tx VGA Gain Programming Serially. “0” = Tx VGA gain programmed with external
digital inputs (B6:B1); “1” = Tx VGA gain programmed with data bits in the Tx gain
register (D5:D0).
9
1
PA Driver linearity. “00” = 50% current (minimum linearity); “01” = 63% current;
“10” = 78% current; “11” = 100% current (maximum linearity)
8
0
7
0
Tx VGA linearity. “00” = 50% current (minimum linearity); “01” = 63% current;
“10” = 78% current; “11” = 100% current (maximum linearity)
6
0
3
0
Tx Upconverter Linearity. “00” = 50% current (minimum linearity); “01” = 63% current;
“10” = 78% current; “11” = 100% current (maximum linearity).
2
0
1
0
Tx Base-band Gain. “00” = max base-band gain -5dB; “01” = max base-band gain -3dB;
“10” = max base-band gain -1.5dB; “11” = max base-band gain.
0
0
This register sets the RX base-band gain and RF gain when MAXIM A Register 6 Bit12
= „1‟.
Byte 1-0
D15 D14
D13
D12
D11
D10
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
Default
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
Reconfigurable bits:
Bit
Default
Description
6
1
Rx base-band and RF gain-control bits. Bit 6 maps to digital input pin B1. Bit6:BitD0 = “0000000”
corresponds to minimum gain.
5
1
4
1