SA2400A Datasheet, PDF (21/34 Pages) NXP Semiconductors – Single chip transceiver for 2.45 GHz ISM band

Philips Semiconductors
Single chip transceiver for 2.45 GHz ISM band
Product data
SA2400A
Table 16. Address 02: Synthesizer Register C
Note: Bits 22, 23 not used.
Bit
21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
Name
unused
CP[1:0]
SM[2:0]
‘0’ unused
Default
0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 000
Bit
CP[1:0]
SM[2:0]
Description
Charge pump current setting
Comparison divider select
Adds an extra divider at the end of the reference divider: extra division ratio = 2^SM (SM = 0 to 4)
CP[1:0]
00
01
10
11
php
480 µA
160 µA
480 µA
160 µA
php-speedup
2.4 mA
800 µA
2.4 mA
800 µA
php-speedup is activated when the speed-up bit is 1 (T_spu in synthesizer register D). php-speedup is also entered after sending a synthesizer
register A word and stays active until a different word is sent. To prevent frequency deviations when leaving the speedup mode when
programming new words, it is recommended to keep the speedup mode always disabled by setting the Tphpsu (0x03, bit 16) to ‘1’.
NOTE: The only recommended charge pump current setting mode is CP[1:0] = 10, php-speedup not activated.
Table 17. Address 03: Synthesizer Register D
Note: Bits 22, 23 not used.
Bit
21 20 19 18 17 16
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
Name
‘00000’
T_phpsu T_spu
‘000000000000’
unused
Default 0 0 0 0 0
0
0
0 0 0 0 0 0 0 0 0 0 0 0 0 00
Bit
T_phpsu
T_spu
Description
1 –> disable PHP speedup pump, overrides function of T_spu
1 –> speedup ON
0 –> speedup OFF
2002 Nov 04
21