RF2968 Просмотр технического описания (PDF) - RF Micro Devices

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RF2968

BLUETOOTH™ TRANSCEIVER

RF Micro Devices 

RF2968

Preliminary

11

Register 4 - IF Register 2 (Write-Only)

Bit Number

12 - 15

11

10

8-9

5-7

4

3

2

0-1

Bit Name

N/A

ChopENB

Div2ENB

LPO[1:0]

Gain[2:0]

ENSlowAGCB

N/A

TPL_AC

TDet[1:0]

Comments

Not Assigned

Enables circuitry that significantly reduces the levels of RF PLL comparison

frequency spurious responses.

1: Spur cancellation disabled.

0: Normal mode. Spur cancellation enabled.

Enables an additional divide-by-two operation in the reference divider cir-

cuitry to accommodate the use of a 20MHz-40MHz crystal or clock. This

allows a migration path to higher reference frequencies.

1: Normal mode. 10, 11, 12, 13, or 20MHz reference clock.

0: Expanded mode. Reference clock is double that allowed in normal mode.

Determines the function of the low power mode clock (output at pin 7) when

the device is in Sleep mode according to the table below. In non-Sleep

modes, the output is disabled.

Sets the gain of the transmitter path. The gain is normally programmed

immediately after the register write to enter the WAIT DATA SYNC state in

Power Class 1 applications. Gain is adjustable from 0dBto-28dB in 4dB

steps. [All 0’s indicates high gain (0dB attenuation); all 1’s indicates low gain

(28dB attenuation).] Example: Gain[2:0]=[011] indicates 12dB attenuation.

1: Slow AGC disabled.

0: Normal mode. Slow AGC enabled.

Not Assigned

Selects a path in the RX data DC estimation circuit.

1: Selects the DC estimation path that is AC coupled and which is normally

used for the payload part of packet.

0: Selects the fast DC estimation RX data path normally used for the access

code of packet.

Sets the receiver gain according to the table below.

LPO [1:0]:

LPO[1:0]

0X

10

11

Output at LPO (Pin 7)

32kHz clock

3.2kHz clock

Clock disabled

TDet [1:0]:

TDet[1:0]

11

10

01

00

VGA Gain (dB)

-11

4.5

4.5

20

Filter Gain (dB)

1.5

1.5

17

17

Total Gain (dB)

-9.5

6.0

21.5

37.0

Step Size (dB)

15.5

15.5

15.5

11-130

Rev A13 010912

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