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參數(shù)資料
| 型號： | MAX7377 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | Silicon Oscillator with Low-Power Frequency Switching |
| 中文描述： | 硅振蕩器，提供低功耗頻率切換 |
| 文件頁數(shù)： | 7/9頁 |
| 文件大?。?/td> | 615K |
| 代理商： | MAX7377 |
M
Silicon Oscillator with Low-Power
Frequency Switching
_______________________________________________________________________________________
7
input condition, connect a pullup or pulldown resistor to
the SPEED input to set the clock to the preferred speed
on power-up. The leakage current through the resistor
into the SPEED input is very low, so a resistor value as
high as 500k
may be used.
Applications Information
Interfacing to a Microcontroller
Clock Input
The MAX7377 clock output is a push-pull, CMOS, logic
output that directly drives any microprocessor (μP) or
μC clock input. There are no impedance-matching
issues when using the MAX7377. The MAX7377 is not
sensitive to its position on the board and does not need
to be placed right next to the μP. Refer to the microcon-
troller data sheet for clock-input compatibility with exter-
nal clock signals. The MAX7377 requires no biasing
components or load capacitance. When using the
MAX7377 to retrofit a crystal oscillator, remove all bias-
ing components from the oscillator input.
Output Jitter
The MAX7377’s jitter performance is given in the
Electrical Characteristics
table as a peak-to-peak value
obtained by observing the output of the MAX7377 for
20s with a 500MHz oscilloscope. Jitter values are
approximately proportional to the period of the output
frequency of the device. Thus, a 4MHz part has
approximately twice the jitter value of an 8MHz part.
The jitter performance of clock sources degrades in the
presence of mechanical and electrical interference.
The MAX7377 is relatively immune to vibration, shock,
and EMI influences, and thus provides a considerably
more robust clock source than crystal or ceramic res-
onator-based oscillator circuits.
Initial Power-Up and Operation
An internal power-up reset disables the oscillator until
V
CC
has risen above 2.2V. The clock then starts up
within 30μs (typ) at the frequency determined by the
SPEED pin.
Extended Temperature Operation
The MAX7377 was tested to +135°C during product
characterization and shown to function normally at
this temperature (see the
Typical Operating
Characteristics
). However, production test and qualifi-
cation is only performed from -40°C to +125°C at this
time. Contact the factory if operation outside this range
is required.
Power-Supply Considerations
The MAX7377 operates with a 2.7V and 5.5V power-
supply voltage. Good power-supply decoupling is
needed to maintain the power-supply rejection perfor-
mance of the MAX7377. Bypass V
CC
to GND with a
0.1μF surface-mount ceramic capacitor. Mount the
bypass capacitor as close to the device as possible. If
possible, mount the MAX7377 close to the microcon-
troller’s decoupling capacitor so that additional decou-
pling is not required. A larger value bypass capacitor is
recommended if the MAX7377 is to operate with a large
capacitive load. Use a bypass capacitor value of at
least 1000 times that of the output load capacitance.
LOGIC
32kHz
(LF OSCILLATOR)
POR
MUX
CLOCK
SPEED
V
CC
MAX7377
600kHz TO 10MHz
(HF OSCILLATOR)
Figure 1. Functional Diagram
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