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參數資料
| 型號： | MB88R157A |
| 廠商： | FUJITSU LTD |
| 元件分類： | 時鐘產生/分配 |
| 英文描述： | OTHER CLOCK GENERATOR, PDSO8 |
| 封裝： | 4.40 X 3.10 MM, 1.20 MM HEIGHT, 0.65 MM PITCH, PLASTIC, TSSOP-8 |
| 文件頁數： | 1/28頁 |
| 文件大小： | 1186K |
| 代理商： | MB88R157A |
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FUJITSU SEMICONDUCTOR
DATA SHEET
Copyright2010 FUJITSU SEMICONDUCTOR LIMITED All rights reserved
2010.7
ASSP
Spread Spectrum Clock Generator
MB88R157A
■ DESCRIPTION
MB88R157A is a clock generator for EMI (Electro Magnetic Interference) reduction. The peak of unnecessary
radiation noise (EMI) can be attenuated by making the oscillation frequency slightly modulate periodically with
the internal modulator.
This product has a built-in non-volatile memory, so its frequency setting can memorize each system or application.
Also the product has a built-in oscillation stabilization circuit, so it is not necessary to use the external oscillation
stabilization capacitance.
■ FEATURES
Input frequency
: 10 MHz to 50 MHz
Output frequency
: 1 MHz to 134 MHz
Programmable of the parameter of N divider, M divider, K divider
(N divider : 11-bit, M divider : 12-bit, K divider : 7-bit)
Modulation rate
: no modulation,
±0.125%, ±0.25%, ±0.5%, ±0.75%, ±1.0%, ±1.25%, ±1.5%, ±1.75%
Variable function pin
It is possible to switch the VF pin function by setting to a non-volatile memory.
Modulation enabled: It is possible to turn on/off the modulation operation.
Power down control
Output setting selection: It is possible to save two types of frequency setting into a non-volatile memory, and to
select the type to operate.
Equipped with a crystal oscillation circuit
Built-in oscillation stabilization capacitance : 5 pF to 10 pF (0.039 pF step range)
Clock output Duty : 45
% to 55%
Clock Cycle-Cycle Jitter : Less than 100 ps (Output clock is over 3 MHz)
Low power consumption by CMOS process 5 mA (24 MHz, Typ-sample, no load) [Target value]
(Input frequency : 24 MHz, N divider parameter : 200, M divider parameter : 200, K divider parameter : 1)
At power down: 5
μA (Power supply voltage = 3.3 V, at room temperature) [Target value]
Power supply voltage : 3.3 V
± 0.3 V
Operating temperature
20 °C to + 85 °C
Package : 8-pin plastic TSSOP
DS04-29146-1E
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