CC2500-RTR1 datasheet(66/99 Pages) TI1

66 / 99 page

CC2500

SWRS040C

Page 66 of 89

0x10: MDMCFG4 – Modem Configuration

Bit

Field Name

Reset

R/W

Description

7:6

CHANBW_E[1:0]

2 (10)

R/W

5:4

CHANBW_M[1:0]

0 (00)

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 (1100)

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.

CC2500-RTR1 データシート(PDF) 66 Page - Texas Instruments

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