bt8960 Mindspeed Technologies, bt8960 Datasheet - Page 65

• Manufacturer Part Number: bt8960
• Description: Bt8960, Single-chip 2b1q Transceiver
• Manufacturer: Mindspeed Technologies

Bt8960
Single-Chip 2B1Q Transceiver
3.2.26 0x21—ADC Control Register (adc_control)
loop_back[1,0]
gain[2:0]
7
–
Loopback Control—Read/write binary field specifying if loopback is enabled, and the type of
loopback that is enabled. During transmitting loopback, the differential receiver inputs (RXP,
RXN) are disabled. The loopback path is intended to go from the transmitter outputs (TXP,
TXN), through the external hybrid circuit, back into the differential receiver balance inputs
(RXBP, RXBN). During silent loop back, the transmitter is turned off, and the output of the
pulse-shaping filter in the transmit section is internally connected to the input of the ADC in
the receive section.
Gain Control—Read/write binary field specifies the gain of the VGA.
6
–
loop_back[1]
loop_back[1,0]
5
gain[2:0]
000
001
010
011
100
101
110
111
00
01
10
11
loop_back[0]
4
N8960DSB
3
–
Normal Operation (Loop Back Disabled)
Hybrid Inputs Disabled (RXBP, RXBN)
gain[2]
2
Transmitting Loopback
Silent Loop Back
VGA Gain
Function
12 dB
15 dB
15 dB
15 dB
3 dB
6 dB
9 dB
0dB
gain[1]
1
3.1 Conventions
3.0 Registers
gain[0]
0
55