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參數(shù)資料
| 型號： | RF2968 |
| 廠商： | RF MICRO DEVICES INC |
| 元件分類： | 通信及網(wǎng)絡(luò) |
| 英文描述： | BLUETOOTHTM TRANSCEIVER |
| 中文描述： | SPECIALTY TELECOM CIRCUIT, PQCC32 |
| 封裝： | 5 X 5 MM, PLASTIC, LCC-32 |
| 文件頁數(shù)： | 20/20頁 |
| 文件大?。?/td> | 150K |
| 代理商： | RF2968 |
Preliminary
11-136
RF2968
Rev A13 010912
11
T
Special Modes of Operation
Calibration
When the RF2968 is
Reset
(CLRB=0), all calibration values are cleared. Therefore, after the RF2968 is powered up
from the OFF state, it must be instructed to perform its self-calibration. Circuits requiring calibration include the RX vari-
able gain amplifier (VGA), TX and RX PLLs, RX channel filter, RX data paths, and TX Gaussian filter.
Calibration instructions are sent from the baseband to the RF2968 via the serial port (addressing Registers 5 and 7) and
must be performed in the order shown in the table below. After a calibration instruction is sent, the baseband must delay
for the length of time indicated before sending the next calibration instruction; this allows time for the RF2968 circuits to
settle and execute the instruction. At initialization, BypassSM, PU_XTAL, PU_MULT, and TX_EN are set high and
remain so for the duration of the calibration. Register 7 is only addressed during initialization to set TX_EN and configure
the reference frequency and RF PLL frequency.
.
Notes:
a) Shaded cells indicate no change from previous state.
b) Set according to reference frequency.
c) Set RF PLL frequency to a valid frequency (LO=2403 to 2481MHz).
d) Register 5 may be programmed immediately after Register 7.
Transmitter Test Mode:
During normal TX mode, the transmitter's IF PLL is opened for modulation of the current controlled oscillator (ICO) for a
short period of time (0.4 to 3ms). For development purposes, open-loop modulation may be performed for an indefinite
period of time by externally supplying the required ICO control voltage. This allows the ICO to maintain a locked condi-
tion.
Transmitter Test Mode utilizes the LPO pin, which is switched to the output of the internal loop filter of the transmitter’s IF
ICO when Set_Tx_PLL_LF_Ext (Register 7, Bit 15) is set high and the 3.2kHz/32kHz low power oscillator is not in use.
This pin may be used either to monitor the control voltage during a packet transmission or to externally supply the control
voltage for an extended or continuous transmission. When monitoring the ICO control voltage, the voltage on the LPO
pin will drift from its initial voltage as the transmission time increases, but should remain in the range of 0.7V to 0.9V.
When supplying the ICO control voltage, the voltage to be applied to the LPO pin should be equal to the initial voltage
measured when monitoring.
Bit Settings for Calibration Sequence
a
Calibration Steps
Register 15 14 13 12 11 10
9
8
7
6
5
4
3
2
1
0
Required Time (usec)
Initialization of PLL
7
0
0
0
0
x
b
x
b
x
b
1
0
x
c
x
c
x
c
x
c
x
c
x
c
x
c
0
d
Initialization of
Chip Control
5
1
0
0
0
0
0
0
0
1
1
0
0
0
0
0
0
2500
Calibrate K
O
of TX and
RX IF PLLs
5
1
0
0
0
0
1
0
0
1
1
0
0
0
0
0
0
1024
Calibrate Gaussian TX
and RX VGA
5
1
0
0
0
1
0
1
0
1
1
0
0
0
1
0
1
285
Calibrate IF Filters
5
1
0
0
0
0
0
0
0
1
1
1
0
0
1
0
1
608
Calibrate RX Offsets
5
1
0
0
0
0
0
0
0
1
1
0
1
0
1
0
0
64
Return Chip Control to
State Machine
5
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Total Calibration Time:
4481
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