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參數(shù)資料
| 型號： | TDA7427AD1TR |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | PLL合成/DDS/VCOs |
| 英文描述： | PLL FREQUENCY SYNTHESIZER, 200 MHz, PDSO28 |
| 封裝： | SO-28 |
| 文件頁數(shù)： | 4/22頁 |
| 文件大?。?/td> | 444K |
| 代理商： | TDA7427AD1TR |
dress being transmitted.
After this comparison, the TDA7427A will gener-
ate an "acknowledge" on the SDA line and will
perform either a read or write operation according
to the state of R/W bit.
Write Operation
Following a START condition the master sends a
slave address word with the R/W bit set to "0".
The TDA7427A will "acknowledge" after this first
transmission and wait for a second word (the
word address field).
This 8 bit address field provides an access to any
of the 8 internal addresses. Upon receipt of the
word address the TDA7427A slave device will re-
spond with an "acknowledge". At this time, all the
following words transmitted to the TDA7427A will
be considered as Data. The internal address will
be automatically incremented. After each word re-
ceipt the TDA7427A will answer with an "acknow-
ledge".
SOFTWARE SPECIFICATION
I
2C Protocol
The interface protocol comprises:
A start condition (s)
A chip address byte (the LSB determines
read/write transmission)
A sub-address byte.
A sequence of data (N-bytes + acknowledge)
A stop condition (P)
CHIP ADDRESS
MSB
LSB
FUNCTION
110001
C
1
0
ADDR pin open
1
ADDR pin connected to VDD
SUBADDRESS
MSB
LSB
FUNCTION
T3
T2
T1
I
A3
A2
A1
A0
0000
Charge pump control
0001
PLL counter 1 (LSB)
0010
PLL counter 2 (MSB)
0011
PLL reference counter 1 (LSB)
0100
PLL reference counter 2 (MSB)
0101
PLL lockdetector control and PLL mode select
0110
IFC reference counter 1 (LSB)
0111
IFC reference counter 2 (MSB) and IFC mode select
1000
IF counter control 1
1001
IF counter control 2
1010
Oscillator adjust
1011
Port extension
0
page mode off
1
page mode enabled
T1, T2, T3 used for testing, in application mode they have to be "0"
CHIP ADDRESS
SUBADDRESS
DATA 1 to DATA n
MSB
LSB
MSB
LSB
MSB
LSB
S
11000
C R/W ACK T
T
I
A3 A2 A1 A0 ACK
DATA
ACK
P
ACK = Acknowledge
S = Start
P = Stop
I = Auto Increment
C = chip select
T = used for testing (in application mode they have to be " 0")
MAX CLOCK SPEED 400kbits/s
TDA7427A
12/21
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