cef830g Hope Microelectronics co., Ltd, cef830g Datasheet - Page 24

• Manufacturer Part Number: cef830g
• Description: Rf42/43 Ism Transmitter
• Manufacturer: Hope Microelectronics co., Ltd

3.6.5. Frequency Offset Adjustment
A frequency offset can be adjusted manually by fo[9:0] in registers 73h and 74h. The frequency offset adjustment is
implemented by shifting the Synthesizer Local Oscillator frequency. This register is a signed register so in order to get
a negative offset you will need to take the twos complement of the positive offset number. The offset can be calculated
by the following:
The adjustment range in high band is: ± 160 kHz, and adjustment range in low band is: ± 80 kHz. For example to
compute an offset of +50 kHz in high band mode fo[9:0] should be set to 0A0h. For an offset of –50 kHz in high band
mode the fo[9:0] register should be set to 360h.
3.6.6. TX Data Rate Generator
The data rate is configurable between 1–128 kbps. For data rates below 30 kbps the‖txdtrtscale‖ bit in register
70hshould be set to 1. When higher data rates are used this bit should be set to 0.
The TX date rate is determined by the following formula:
The txdr register may be found in the following registers.
Add
Add
6E
73
74
6F
R/W
R/W
R/W
R/W
R/W
R/W
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Function/Des
TX Data Rate 1
TX Data Rate 0
Function/Descri
Frequency Offset
Frequency Offset
cription
ption
DesiredOffset = 156.25Hz x (hbsel  + 1) x fo[9 : 0]
txdr[7]
txdr[15]
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D7
fo[7]
D7
txdr[15:0] =
fo[9 : 0] =
DR_ TX =
txdr[14]
txdr[6]
fo[6]
D6
D6
156.25Hz x (hbsel  + 1)
fo[5]
txdr[13]
txdr[5]
D5
DR_ TX X 2
txdr[15:0] x1MHz
D5
DesiredOffset
fo[4]
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D4
txdr[12]
txdr[4]
1MHz
2
D4
16+5*xdtrtscale
fo[3]
16+5*xdtrtscale
D3
txdr[3]
txdr[11]
D3
fo[2]
D2
txdr[2]
txdr[10]
fo[1]
fo[9]
D1
D2
R F 4 2 / 4 3
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fo[1]
fo[8]
txdr[9]
txdr[1]
D0
D1
POR Def.
txdr[8]
txdr[0]
00h
43h
D0
POR Def.
Notes
AAh
0Ah
73
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