CC1100-RTY1 datasheet(69/100 Pages) TI1

69 / 100 page

CC1100

SWRS038D

Page 69 of 92

0x10: MDMCFG4 – Modem Configuration

Bit

Field Name

Reset

R/W

Description

7:6

CHANBW_E[1:0]

2 (0x02)

R/W

5:4

CHANBW_M[1:0]

0 (0x00)

R/W

Sets the decimation ratio for the delta-sigma ADC input stream and thus

the channel bandwidth.

CHANBW

XOSC

channel

CHANBW

)·

(

⋅

The default values give 203 kHz channel filter bandwidth, assuming a 26.0

MHz crystal.

3:0

DRATE_E[3:0]

12 (0x0C)

R/W

The exponent of the user specified symbol rate

0x11: MDMCFG3 – Modem Configuration

Bit

Field Name

Reset

R/W

Description

7:0

DRATE_M[7:0]

34 (0x22)

R/W

The mantissa of the user specified symbol rate. The symbol rate is

configured using an unsigned, floating-point number with 9-bit mantissa

and 4-bit exponent. The 9

th bit is a hidden ‘1’. The resulting data rate is:

()

XOSC

DRATE

DATA

DRATE

⋅

256

The default values give a data rate of 115.051 kBaud (closest setting to

115.2 kBaud), assuming a 26.0 MHz crystal.

CC1100-RTY1 Datasheet(PDF) 69 Page - Texas Instruments

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