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參數(shù)資料
| 型號： | AD9522-5BCPZ-REEL7 |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 40/76頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC CLOCK GEN 2.4GHZ 64LFCSP |
| 標(biāo)準(zhǔn)包裝： | 750 |
| 類型： | 時鐘發(fā)生器，扇出配送 |
| PLL： | 是 |
| 輸入： | CMOS，LVDS，LVPECL |
| 輸出： | CMOS，LVDS，LVPECL |
| 電路數(shù)： | 1 |
| 比率 - 輸入:輸出： | 2:12，2:24 |
| 差分 - 輸入:輸出： | 是/是 |
| 頻率 - 最大： | 2.4GHz |
| 除法器/乘法器： | 是/無 |
| 電源電壓： | 3.135 V ~ 3.465 V |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 64-VFQFN 裸露焊盤，CSP |
| 供應(yīng)商設(shè)備封裝： | 64-LFCSP-VQ（9x9） |
| 包裝： | 帶卷 (TR) |
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AD9522-5
Rev. 0 | Page 45 of 76
SERIAL CONTROL PORT
The AD9522 serial control port is a flexible, synchronous serial
communications port that allows an easy interface with many
industry-standard microcontrollers and microprocessors. The
AD9522 serial control port is compatible with most synchronous
transfer formats, including Philips I2C, Motorola SPI, and
Intel SSR protocols. The AD9522 I2C implementation deviates
from the classic I2C specification on two specifications; these
deviations are documented in Table 11 of this data sheet. The
serial control port allows read/write access to all registers that
configure the AD9522.
SPI/IC PORT SELECTION
The AD9522 has two serial interfaces, SPI and I2C. Users can
select either SPI or I2C depending on the states of the three
logic level (high, open, low) input pins, SP1 and SP0. When
both SP1 and SP0 are high, the SPI interface is active. Otherwise,
I2C is active with eight different I2C slave address (seven bits
wide) settings, see Table 34. The four MSBs of the slave address
are hardware coded as 1011, and the three LSBs are programmed
by SP1 and SP0.
Table 34. Serial Port Mode Selection
SP1
SP0
Address
Low
IC, 1011000
Low
Open
IC, 1011001
Low
High
IC, 1011010
Open
Low
IC, 1011011
Open
IC, 1011100
Open
High
IC, 1011101
High
Low
IC, 1011110
High
Open
IC, 1011111
High
SPI
IC SERIAL PORT OPERATION
The AD9522 I2C port is based on the I2C fast mode standard.
The AD9522 supports both I2C protocols: standard mode
(100 kHz) and fast mode (400 kHz).
The AD9522 I2C port has a 2-wire interface consisting of a serial
data line (SDA) and a serial clock line (SCL). In an I2C bus system,
the AD9522 is connected to the serial bus (data bus SDA and
clock bus SCL) as a slave device, meaning that no clock is generated
by the AD9522. The AD9522 uses direct 16-bit (two bytes)
memory addressing instead of traditional 8-bit (one byte) memory
addressing.
I2C Bus Characteristics
Table 35. I2C Bus Definitions
Abbreviation
Definition
S
Start
Sr
Repeated start
P
Stop
A
Acknowledge
A
No acknowledge
W
Write
R
Read
One pulse on the SCL clock line is generated for each data bit
transferred.
The data on the SDA line must not change during the high
period of the clock. The state of the data line can change only when
the clock on the SCL line is low.
SDA
SCL
DATA LINE
STABLE;
DATA VALID
CHANGE
OF DATA
ALLOWED
0
7240-
160
Figure 43. Valid Bit Transfer
A start condition is a transition from high to low on the SDA
line while SCL is high. The start condition is always generated
by the master to initialize the data transfer.
A stop condition is a transition from low to high on the SDA
line while SCL is high. The stop condition is always generated
by the master to end the data transfer.
START
CONDITION
S
STOP
CONDITION
P
SDA
SCL
0724
0-
161
Figure 44. Start and Stop Conditions
A byte on the SDA line is always eight bits long. An acknowledge
bit must follow every byte. Bytes are sent MSB first.
The acknowledge bit is the ninth bit attached to any 8-bit data
byte. An acknowledge bit is always generated by the receiving
device (receiver) to inform the transmitter that the byte has
been received. It is done by pulling the SDA line low during the
ninth clock pulse after each 8-bit data byte.
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