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Complete SDARS Receiver
Applications Information
Serial Interface and Control Registers
I 2 C Bit Description
MAX2140 Programming Bits:
The MAX2140 conforms to the Philips I 2 C standard,
400kbps (fast mode), and operates as a slave.
The MAX2140 addresses can be selected from three
values, which are determined by the logic state of the
two address-select pins I 2 CA1 and I 2 CA2. In all cases,
the MSB is transmitted (and read) first.
MAX2140 I 2 C-Compatible Programming Bit Definition:
BYTE PLLint:
RFD = reference buffer division: RFD = 0 (/1) and
RFD = 1 (/2)
N6 to N0 is the binary-written main dividing ratio,
integer part.
BYTE PLLfrac2:
PLS = Reserved: use only PLS = 0
LI1/0 = Reserved: use only LI1 = LI0 = 0
INT = Integer N mode: INT = 1 (fractional) and INT =
0 (integer)
Table 1. MAX2140 Write Address Bytes
AS1
AS0
MSB
ADDRESS BYTE
LSB
Low
High
High
High
Low
High
1
1
1
1
1
1
0
0
0
0
0
0
0
0
0
0
1
1
1
0
1
0
0
0
Table 2. MAX2140 Read Address Bytes
AS1
AS0
MSB
ADDRESS BYTE
LSB
Low
High
High
High
Low
High
1
1
1
1
1
1
0
0
0
0
0
0
0
0
0
0
1
1
1
0
1
1
1
1
Table 3. MAX2140 Write Programming Bits
WRITE-TO MODE
RESET VALUE
ADDR (hex)
MSB
CONTROL BYTE
LSB
C2
1
1
0
0
0
0
1
0
Address
PLLint
PLLfrac2
PLLfrac1
PLLfrac0
Control
CustomGain
PMA_Test
LPFTrim
Unused2
Unused1
Unused0
—
01010110
00011110
10010000
01101001
01100000
00000100
00000000
00000000
00000000
00000000
00000000
C4
C6
00
01
02
03
04
05
06
09
08
07
10
1
1
RFD
PLS
F15
F07
REF
RF4
PM3
0
0
0
0
1
1
N6
LI1
F14
F06
CHP
RF3
PM2
0
0
0
0
0
0
N5
LI0
F13
F05
D48
RF2
PM1
IOT
0
0
0
0
0
N4
INT
F12
F04
SDR
RF1
PM0
B4
0
0
0
0
0
N3
F19
F11
F03
ANT
RF0
SDX
B3
0
0
0
1
1
N2
F18
F10
F02
SDF
LP1
T2
B2A
0
0
0
0
1
N1
F17
F09
F01
SDB
LP0
T1
B2
0
0
0
0
0
N0
F16
F08
F00
SDP
HPF
T0
B1
0
0
0
______________________________________________________________________________________
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