參數(shù)資料
型號(hào)： MAX9485ETP+
廠(chǎng)商： MAXIM INTEGRATED PRODUCTS INC
元件分類(lèi)： 時(shí)鐘產(chǎn)生/分配
英文描述： 73.728 MHz, OTHER CLOCK GENERATOR, QCC20
封裝： 4 X 4 MM, 0.80 MM PITCH, MO-220WGGD-1, TQFN-20
文件頁(yè)數(shù)： 15/16頁(yè)
文件大小： 258K
代理商： MAX9485ETP+
MAX9485
Voltage-Controlled Crystal Oscillator
(VCXO)
The MAX9485 internal VCXO produces a 27MHz refer-
ence clock for the PLL used to generate CLK_OUT1
and CLK_OUT2. The oscillator uses a 27MHz crystal as
the base frequency reference and has a voltage-con-
trolled tuning input for micro adjustment in a range of
±200ppm. The tuning voltage VTUN can vary from 0 to
3V as shown in Figure 2. Use an AT-cut crystal that
oscillates at 27MHz on its fundamental mode with
±30ppm. Use a crystal shunt capacitor less than 12pF,
including board parasitic capacitance. Choose an
oscillator with a load capacitance less than 14pF to
achieve ±200ppm pullability. VCXO, a free-run oscilla-
tor, and the buffered output MCLK are not affected by
power-on reset and external reset. VCXO has a 5ms
settling time at power-on and 10s at a change of the
VTUN voltage.
The MAX9485 can be used as a synthesizer with a
27MHz input reference clock. For this mode, connect
the 27MHz input clock to X1. Connect TUN to VDD and
leave X2 open. This configuration is for applications
where the micro tuning is not needed and there is a
27MHz system master clock available.
Chip Reset Function
The MAX9485 has an internal reset function. The
device resets at power-up or can be externally reset by
driving RST low. The reset function sets the registers to
default values. MODE sets the device’s programming
mode at power-up. When MODE = low, the device is
set to software-programmable mode. Set MODE = high
for hardwired mode. If MODE = low, the reset sets
default values for CLK_OUT1 and CLK_OUT2 to 256 x
fS with fS = 32kHz. If MODE = high, the reset sets
CLK_OUT1 and CLK_OUT2, according to the values of
the hardwired inputs.
Programmable Audio Clock Generator
8
_______________________________________________________________________________________
Table 1. Sampling Frequency and Output Clock
SAMPLING
FREQUENCY
CLK_OUT
fS (kHz)
256 x fS (MHz)
384 x fS (MHz)
768 x fS (MHz)
SAMPLING RATE
12
3.072
4.608
9.126
Standard
32
8.1920
12.2880
24.5760
Standard
44.1
11.2896
16.9344
33.8688
Standard
48
12.2880
18.4320
36.8640
Standard
64
16.3840
24.5760
49.1520
Double
88.2
22.5792
33.8688
67.7376
Double
96
24.5760
36.8640
73.7280
Double
tFST
TRANSITION
STABLE
ACK
PULSE
CLK_OUT
SDA
HIGH
LOW
Figure 1. CLK_OUT Transient Timing
27.0054
27
400ppm
VCXO
OUTPUT
FREQUENCY
(MHz)
26.9946
0V
VTUN
3V
Figure 2. VCXO Tuning Range
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MAX9485ETP+ 功能描述:時(shí)鐘發(fā)生器及支持產(chǎn)品 Programmable Audio Clock Generator RoHS:否 制造商:Silicon Labs 類(lèi)型:Clock Generators 最大輸入頻率:14.318 MHz 最大輸出頻率:166 MHz 輸出端數(shù)量:16 占空比 - 最大:55 % 工作電源電壓:3.3 V 工作電源電流:1 mA 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-56
MAX9485ETP+T 功能描述:時(shí)鐘發(fā)生器及支持產(chǎn)品 Programmable Audio Clock Generator RoHS:否 制造商:Silicon Labs 類(lèi)型:Clock Generators 最大輸入頻率:14.318 MHz 最大輸出頻率:166 MHz 輸出端數(shù)量:16 占空比 - 最大:55 % 工作電源電壓:3.3 V 工作電源電流:1 mA 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-56
MAX9485ETP-T 功能描述:時(shí)鐘發(fā)生器及支持產(chǎn)品 Programmable Audio Clock Generator RoHS:否 制造商:Silicon Labs 類(lèi)型:Clock Generators 最大輸入頻率:14.318 MHz 最大輸出頻率:166 MHz 輸出端數(shù)量:16 占空比 - 最大:55 % 工作電源電壓:3.3 V 工作電源電流:1 mA 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-56
MAX9485EUP 功能描述:時(shí)鐘發(fā)生器及支持產(chǎn)品 RoHS:否 制造商:Silicon Labs 類(lèi)型:Clock Generators 最大輸入頻率:14.318 MHz 最大輸出頻率:166 MHz 輸出端數(shù)量:16 占空比 - 最大:55 % 工作電源電壓:3.3 V 工作電源電流:1 mA 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-56
MAX9485EUP+ 功能描述:時(shí)鐘發(fā)生器及支持產(chǎn)品 Programmable Audio Clock Generator RoHS:否 制造商:Silicon Labs 類(lèi)型:Clock Generators 最大輸入頻率:14.318 MHz 最大輸出頻率:166 MHz 輸出端數(shù)量:16 占空比 - 最大:55 % 工作電源電壓:3.3 V 工作電源電流:1 mA 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-56
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