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參數(shù)資料
| 型號(hào)： | U2733B-C |
| 英文描述： | Fractional-N Frequency Synthesizer for DAB Tuner |
| 中文描述： | 分?jǐn)?shù)N頻率合成器的DAB調(diào)諧器 |
| 文件頁數(shù)： | 5/14頁 |
| 文件大?。?/td> | 157K |
| 代理商： | U2733B-C |
U2733B-C
Preliminary Information
TELEFUNKEN Semiconductors
Rev. A1, 21-Aug-96
5 (14)
I
2
C Bus Instruction Codes
Description
Divider byte 1
Divider byte 2
Divider byte 3
MSB
0
X
X
LSB
n
n
6
n
0
ááááááááááááááááááááááááááá
ááááááááááááááááááááááááááá
ááááááááááááááááááááááááááá
X
n
11
n
10
X
n
9
X
n
8
n
n
7
n
RD1
RD2
n
4
n
3
n
2
n
1
ááááááááááááááááááááááááááá
áááááááááááááá
áááááááááááááá
ááááááááááááááááááááááááááá
X
n
5
I
2
C Bus Functions
AS1, AS2
define the I
2
C bus address
RD1, RD2
define the effective scaling factor of the
reference divider:
áááááááááááááá
á
áááááááááááááá
áááááááááááááá
áááááááááááááá
áááááááááááááá
n
eff
) of the main
divider
SF
eff
= SUM(n
i
2
i
)
OS
OS = ‘H’ switches off tuning output
áááá
áááááááááááááá
0
1
RD1
á
áááá
0
1
RD2
á
1120
1536
áááá
á
Effective
Scaling
T
for T = ‘H’ reference signals describing the
output frequencies of reference reference divider
and programmable divider are monitored at SWF
(prog. div.) and SWC (ref. div.)
TRI
TRI = ‘H’ switches off charge pump
ááááááááááááááá
á
ááááááááááááááá
ááááááááááááááá
ááá
I50
áááááááááááááá
á
I100
ááá
á
Charge Pumup Current
ááááááááááááááá
á
ááááááááááááááá
2IFD
2IFD = ‘H’ doubles the frequency doubler output
current
SWa
SWa = ‘H’ switches on output current
I
2
C Bus Data Transfer
Format
START – ADR – ACK – <instruction set> – STOP
The <instruction set> consists of a sequence of divider
bytes and control bytes each followed by ACK. Divider
byte i must be followed by divider byte i+1 (control byte
1 if i = 3) or the instruction set must be finished. Control
bytes have to be handled accordingly.
Examples
START – ADR – ACK – DB1 – ACK – DB2 – ACK – DB3
– ACK – CB1 – ACK – CB2 –ACK – CB3 – ACK – STOP
START – ADR – ACK – CB1 – ACK – CB2 – ACK –
STOP
However
START – ADR – ACK – DB1 – ACK – CB1 –ACK –
STOP
is not allowed.
Description
START
start condition
STOP
stop condition
ACK
acknoledge
ADR
address byte
DBi
divider byte i (i = 1, 2, 3)
CBi
control byte i (i = 1, 2, 3)
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