RF2968 Просмотр технического описания (PDF) - RF Micro Devices

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RF2968

BLUETOOTH™ TRANSCEIVER

RF Micro Devices 

Preliminary

RF2968

Register 5 - IF Register 3 (Write-Only)

Bit Number

Bit Name

Comments

15

BypassSM

Selects or bypasses the state machine.

1: Bypass mode. Internal power-up signals can be directly controlled by programming of the

respective bits in this register [0:3, 6:7].

0: Normal mode. All internally controlled power-up signals are derived from the state machine.

14

BBC

Selects baseband control or internal timer control for determining the time at which to perform DC

estimation on the trailer bits.

1: Baseband control. The baseband drives BPKTCTL high at the end of the sync word.

0: Internal timer control.

13

N/A

Not assigned.

12

Test

IF test mode enable. Used only in IC verification; not for use in end product.

1: IF test mode

0: Normal mode

11

CalRxVGA

Calibration which compensates for the gain of the LNA, mixer, and VGA. See “Special Modes: Cal-

ibration”.

10

Cal_Tx_PLL

Calibrates the K0 (gain of the current controlled oscillator) of the TX PLL and, by nature of the

design, calibrates the K0 of the RX PLL. See “Special Modes: Calibration”.

9

Cal_Gauss_Cell Calibration which compensates for the offset and the amplitude of the Gaussian TX data that mod-

ulates the TX PLL ICO. See “Special Modes: Calibration”.

8

Loopback

1: Loopback mode. The TX IF output is looped back to the RX IF input.

0: Normal mode

7

PU_XTAL

Powers up the crystal oscillator circuitry. See “BypassSM” bit.

1: Power on

0: Power off

6

PU_MULT

Powers up the frequency multiplier for the FM demodulator clock. See “Bypass SM” bit.

1: Power on

0: Power off

5

CalRxFil

Calibrates the channel filter, demodulator low pass filter, and AC coupling filter in the DC estima-

tion circuit in the receiver, as well as the Gaussian filter and GFSK harmonic filter in the transmit-

ter. See “Special Modes: Calibration”.

4

CalRXPLL_Int Calibration which compensates for the offset of the RX data path in the RX PLL interface circuit.

See “Special Modes: Calibration”.

3

PU_PA

Powers up the transmit output amplifier. See “BypassSM” bit.

1: Power on

0: Power off

2

PU_RX

Powers up all receiver and synthesizer circuits. See “BypassSM” bit.

1: Power on

0: Power off

1

PLL_BW

Selects the loop bandwidth of the RF PLL by controlling the state of the RSHUNT pin. Under state

machine control, this switch is executed according to the setting of the PLLDel[1:0] bits.

1: Narrow bandwidth. RSHUNT is short-circuited to ground.

0: Wide bandwidth. RSHUNT is a high impedance.

0

PU_TX

Powers up all transmitter and synthesizer circuits except for the output amplifier. See “BypassSM”

bit.

1: Power on

0: Power off

11

Rev A13 010912

11-131

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