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参数资料
| 型号： | MAX9485ETP+ |
| 厂商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分类： | 时钟产生/分配 |
| 英文描述： | 73.728 MHz, OTHER CLOCK GENERATOR, QCC20 |
| 封装： | 4 X 4 MM, 0.80 MM PITCH, MO-220WGGD-1, TQFN-20 |
| 文件页数： | 3/16页 |
| 文件大小： | 258K |
| 代理商： | MAX9485ETP+ |
SDA line operates as both an input and an open-drain
output. A pullup resistor, typically 4.7k
Ω, is required on
SDA. The SCL line operates only as an input. A pullup
resistor, typically 4.7k
Ω, is required on SCL if there are
multiple masters on the 2-wire bus, or if the master in a
single-master system has an open-drain SCL output.
Start and Stop Conditions
Both SCL and SDA remain high when the interface is
idle. The active master signals the beginning of a trans-
mission with a START (S) condition by transitioning
SDA from high to low while SCL is high. After communi-
cation, the MAX9485 issues a STOP (P) condition by
transitioning SDA from low to high while SCL is high,
freeing the bus for another transmission (Figure 5). If a
START or STOP occurs while a bus transaction is in
progress, then it terminates the transaction.
Data Transfer and Acknowledge
Following the START condition, each SCL clock pulse
transfers 1 bit. For the MAX9485 interface, between a
START and a STOP, 18 bits are transferred on the
2-wire bus. The first 7 bits are for the device address.
Bit 8 indicates the writing (low) or reading (high) opera-
tion (R/W). Bit 9 is the ACK for the address and opera-
tion type. Bits 10 though 17 form the data byte. Bit 18 is
the ACK for the data byte. The master always transfers
the first 8 bits (address + R/W). The slave (MAX9485)
can receive the data byte from the bus or transfer it to
the bus from the internal register. The ACK bits are
transmitted by the address or data recipient. A low
ACK bit indicates a successful transfer (Acknowledge),
a high ACK bit indicates an unsuccessful transfer (Not
Acknowledge). Figure 6 shows the structure of the data
transfer. During a write operation, if more synchronous
data is transferred, it overwrites the data in the register.
During a read operation, if more clocks are reset on
SCL, the SDA continues to respond to the register data.
MAX9485
Programmable Audio Clock Generator
______________________________________________________________________________________
11
C3
C2
OUTPUT SCALING FACTOR
0
256
0
1
384
1
0
768
1
Reserved
Table 13. Frequency Scaling Factors
C1
C0
SAMPLING FREQUENCY (kHz)
00
12
01
32
1
0
44.1
11
48
SDA
SCL
START
CONDITION
STOP
CONDITION
S
P
Table 14. Sampling Frequency Selection
Note: (C1, C0) = (0, 0) and C4 = 1 (double) is not a proper selec-
tion. However, when set, it selects 12kHz sampling frequency.
Figure 5. Start and Stop Conditions
S
SLAVE ADDRESS
7 BITS
R/W
A
A = ACK; A = 0: ACKNOWLEDGE, A = 1: NOT ACKNOWLEDGE
S = START CONDITION
P = STOP CONDITION
MASTER-WRITE DATA STRUCTURE
MASTER TRANSFERS TO SLAVE
SLAVE TRANSFERS TO MASTER
MASTER-READ DATA STRUCTURE
DATA
8 BITS
P
A
R/W
SLAVE ADDRESS
7 BITS
S
DATA
8 BITS
P
A
Figure 6. Serial Interface Data Structure
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX9485ETP+ | 功能描述:时钟发生器及支持产品 Programmable Audio Clock Generator RoHS:否 制造商:Silicon Labs 类型:Clock Generators 最大输入频率:14.318 MHz 最大输出频率:166 MHz 输出端数量:16 占空比 - 最大:55 % 工作电源电压:3.3 V 工作电源电流:1 mA 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:QFN-56 |
| MAX9485ETP+T | 功能描述:时钟发生器及支持产品 Programmable Audio Clock Generator RoHS:否 制造商:Silicon Labs 类型:Clock Generators 最大输入频率:14.318 MHz 最大输出频率:166 MHz 输出端数量:16 占空比 - 最大:55 % 工作电源电压:3.3 V 工作电源电流:1 mA 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:QFN-56 |
| MAX9485ETP-T | 功能描述:时钟发生器及支持产品 Programmable Audio Clock Generator RoHS:否 制造商:Silicon Labs 类型:Clock Generators 最大输入频率:14.318 MHz 最大输出频率:166 MHz 输出端数量:16 占空比 - 最大:55 % 工作电源电压:3.3 V 工作电源电流:1 mA 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:QFN-56 |
| MAX9485EUP | 功能描述:时钟发生器及支持产品 RoHS:否 制造商:Silicon Labs 类型:Clock Generators 最大输入频率:14.318 MHz 最大输出频率:166 MHz 输出端数量:16 占空比 - 最大:55 % 工作电源电压:3.3 V 工作电源电流:1 mA 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:QFN-56 |
| MAX9485EUP+ | 功能描述:时钟发生器及支持产品 Programmable Audio Clock Generator RoHS:否 制造商:Silicon Labs 类型:Clock Generators 最大输入频率:14.318 MHz 最大输出频率:166 MHz 输出端数量:16 占空比 - 最大:55 % 工作电源电压:3.3 V 工作电源电流:1 mA 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:QFN-56 |
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