RF2968 Просмотр технического описания (PDF) - RF Micro Devices

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Компоненты Описание

производитель

RF2968

BLUETOOTH™ TRANSCEIVER

RF Micro Devices 

RF2968

Preliminary

11

Register 6 - IF Register 4 (Write-Only)

Bit Number

Bit Name

0-15

N/A

Not Assigned

Comments

Register 7 - PLL Control (Write-Only)

Bit Number

Bit Name

Comments

15

Set_Tx_PLL_LF_Ext Configures the LPO pin as a test pin when bits LPO[1:0] are set high.

1: Test mode. LPO is connected to the IF PLL loop filter of the transmitter.

(See “Special Modes: Transmitter Test Mode”.)

0: Normal mode. LPO is not connected to the IF PLL loop filter of the trans-

mitter.

13 - 14

PLLDel [1:0]

Determines the time in which the PLL remains in high bandwidth mode

before switching to low bandwidth mode. In high bandwidth mode, the PLL

loop bandwidth is optimized for fast frequency locking. In low bandwidth

mode, the loop bandwidth is optimized for low phase noise. See below. See

also pin descriptions of D0 and RSHUNT, and bit PLL_BW (Register 5, Bit

1).

12

RSSI_Test

Configures the RSSI circuitry to operate continuously for test purposes.

1: Test mode. Continuous operation.

0: Normal mode. Packet-based operation.

9 - 11

DivR [2:0]

Selects the external crystal frequency. See below.

8

TX_EN

Powers up the TX voltage and current bias circuits and the TX PLL’s ICO

voltage threshold set circuit.

7

RX_EN

Powers up the RX voltage and current bias circuits.

0-6

PLL [6:0]

Sets the RF PLL frequency. See below.

PLLDel [1:0]:

PLLDel [1:0]

00

01

10

11

Delay (us)

0

50

100

150

DivR [2:0]:

DivR [2:0]

011

100

101

110

111

Crystal Freq (MHz)

12

10

11

13

20

11-132

Rev A13 010912

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