FUJITSU MB88152A, MB88152A-100, MB88152A-101, MB88152A-102, MB88152A-110 DATA SHEET
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FUJITSU MICROELECTRONICS
DATA SHEET
DS04-29125-2Ea
Spread Spectrum Clock Generator
MB88152A
MB88152A-100/101/102/110/111/112
■ DESCRIPTION
MB88152A is a clo ck generator for EMI (Electro Magnetic Interference) red uction. The peak of unnecess ary
radiation noise (EM I) can be attenuated by mak ing the osci llation frequen cy slightly m odulate per iodically wit h
the internal modula tor. It corresponds to bot h of the ce nter sprea d which m odulate s input fre quency a s Middle
Centered and down spread which modulates so as not to exceed input frequency.
■ FEATURES
• Input frequency : 16.6 MHz to 134 MHz
• Output frequency : 16.6 MHz to 134 MHz
• Modulation rate : ± 0.5%, ± 1.5% (Center spread), − 1.0%, − 3.0% (Down spread)
• Equipped with oscillation circuit: Range of oscillation 16.6 MHz to 48 MHz
• Modulation clock output Duty : 40% to 60%
• Modulation clock Cycle-Cycle Jitter : Less than 100 ps
• Low current consumption by CMOS process : 5.0 mA (24 MHz : Typ-sample, no load)
• Power supply voltage : 3.3 V ± 0.3 V
• Operating temperature : − 40 °C to +85 °C
• Package : SOP 8-pin
Copyright©2007-2008 FUJITSU MICROELECTRONICS LIMITED All rights reserved
2007.6
MB88152A
■ PRODUCT LINE-UP
MB88152A has th ree kinds of inpu t frequency, and two kinds of modulat ion type (cen ter/down sp read), tota l six line-
ups.
Product Input/Output Frequency Modulation type Modulation enable pin
MB88152A-100 16.6 MHz to 134 MHz
No
MB88152A-101 16.6 MHz to 67 MHz
MB88152A-102 40 MHz to 134 MHz
MB88152A-110 16.6 MHz to 134 MHz
MB88152A-111 16.6 MHz to 67 MHz
MB88152A-112 40 MHz to 134 MHz
■ PIN ASSIGNMENT
TOP VIEW
XIN
XOUT
V
SS
SEL
1
MB88152A-101
2
MB88152A-102
MB88152A-111
3
MB88152A-112
4
FPT-8P-M02
8
7
6
5
XENS
FREQ
DD
V
CKOUT
Down spread
Center spread
1
XIN
2
XOUT
SS
3
V
4
SEL
MB88152A-100
MB88152A-110
FPT-8P-M02
8
7
6
5
FREQ1
FREQ0
DD
V
CKOUT
Yes
No
Yes
■ PIN DESCRIPTION
Pin name I/O Pin no. Description
XIN I 1 Crystal resonator connec ti on pin/cl oc k inp ut pin
XOUT O 2 Cryst al resonator connection pin
V
SS 3 GND pin
SEL I 4 Modulation rate setting pin
CKOUT O 5 Modulated clock output pin
V
DD 6 Power supply voltage pin
FREQ/FREQ0 I 7 Frequency setting pin
XENS/FREQ1 I 8 Modulation enable setting pin/frequency setting pin
2
■ I/O CIRCUIT TYPE
Pin Circuit type Remarks
CMOS hysteresis input
SEL
FREQ
FREQ0
FREQ1
XENS
• CMOS output
OL = 4 mA
•I
MB88152A
CKOUT
Note : For XIN and XOUT pins, refer to “■OSCILLATION CIRCUIT”.
3
MB88152A
■ HANDLING DEVICES
Preventi n g Latch-up
A latch-up can occur if, on this device, (a) a voltage higher than V
input or output pin or (b) a voltage higher than the rating is applied between V
occurs, significantly increases the power supply current and may cause thermal destruction of an element. When
you use this device, be very careful not to exceed the maximum rating.
Handling unused pins
Do not leave an unused input pin open, since it may cause a malfunction. Handle by, using a pull-up or
pull-down resistor.
Unused output pin should be opened.
The attention when the external clock is used
Input the clock to XIN pin, and XOUT pin should be opened when you use the external clock.
Please pay attention so that an overshoot and an undershoot do not occur to an input clock of XIN pin.
Power supply pins
Please design connecting the power supply pin of this device by as low impedance as possible from the current
supply source.
We recommend connecting electrolyti c capacitor (about 10 µF) and the ceramic capacitor (ab out 0.01 µF) in
parallel between V
SS and VDD pins near the device, as a bypass capacitor.
DD or a voltage lower than VSS is applied to an
DD and VSS pins. The la tc h-up, if it
Oscillation Circuit
Noise near the XIN and XOUT pins may cause the device to malfunction. Design printed circuit boards so that
electric wiring of XIN or XOUT pin and resonator (or ceramic oscillator) do not intersect other wiring.
Design the printed circuit board that surrounds the XIN and XOUT pins with ground.
4
■ BLOCK DIAGRAM
MB88152A
VDD
SEL
FREQ/FREQ0
XENS/FREQ1
XOUT
XIN
Modulation rate setting
Frequency setting
Modulation enable /
Frequency setting
Reference clock
Rf = 1 MΩ
PLL block
V
SS
Clock output
CKOUT
Reference
clock
A glitchless IDAC (current output D/A converter) provides precise modulation, thereby
dramatically reducing EMI.
1
−
M
Phase
compare
1
−
N
1
−
L
Charge
pump
V/I
conversion
Loop filter
MB88152A PLL block
IDAC ICO
Modulation logic
Modulation
clock
output
Modulation
rate setting/
Modulation
enable setting
5
MB88152A
■ PIN SETTING
When changing the pin setting, the stabilization wait time for the modulation clock is required. The stabilization
wait time for the modulation clock takes the maximum value of Lock-Up time in “■ ELECTRICAL CHARACTERISTICS • AC characteristics Lock-Up time”.
Modulation enable setting
XENS Modulation
L Modulation
H No modulation
Note : MB88152A-100 and MB88152A-110 do not have XENS pin.
SEL modulation rate setting
SEL Modulation rate R emarks
± 0.5%
L
− 1.0%
MB88152A-110,
MB88152A-111,
MB88152A-112
MB88152A-100,
MB88152A-101,
MB88152A-102
MB88152A-101, MB88152A -102,
MB88152A-111, MB88152A-112
Center spread
Down spread
MB88152A-110,
± 1.5%
H
− 3.0%
Note : The modulation rate can be changed at the level of the terminal.
Frequency setting
FREQ Frequency
L
H
Note : MB88152A-100 and MB88152A-110 do not have FREQ pin.
Frequency setting
FREQ1
L L 16.6 MHz to 40 MHz
FREQ0 Frequency
16.6 MHz to 40 MHz MB88152A-101, MB88152A-111
40 MHz to 80 MHz MB88152A-102, MB88152A-112
33 MHz to 67 MHz MB88152A-101, MB88152A-111
66 MHz to 134 MHz MB88152A-102, MB88152A-112
MB88152A-111,
MB88152A-112
MB88152A-100,
MB88152A-101,
MB88152A-102
Center spread
Down spread
L H 33 MHz to 67 MHz
H L 40 MHz to 80 MHz
H H 66 MHz to 134 MHz
Note : MB88152A-101, MB88152A-111, MB88152A-102 and MB88152A-112 have neither FREQ0 pin nor FREQ1
pin.
6
MB88152A-100, MB88152A-110
• Center spread
Spectrum is spread (modulated) by centering on the input frequency.
3.0% modulation width
Radiation level
−1.5% +1.5%
Input frequency
Center spread example of ± 1.5% Modulation rate
• Down spread
MB88152A
Frequency
Spectrum is spread (modulated) below the input frequency.
3.0% modulation width
Radiation level
−3.0%
Input frequency
Down spread example of − 3.0% Modulation rate
Frequency
7
MB88152A
■ ABSOLUTE MAXIMUM RATINGS
Parameter Symbol
Unit
Min Max
Rating
Power supply voltage* V
Input voltage* V
Output voltage* V
Storage temperature T
Operation junction temperature T
Output current I
Overshoot V
Undershoot V
DD − 0.5 + 4.0 V
I VSS − 0.5 VDD + 0.5 V
O VSS − 0.5 VDD + 0.5 V
ST − 55 + 125 °C
J − 40 + 125 °C
O − 14 + 14 mA
IOVER VDD + 1.0 (tOVER ≤ 50 ns) V
IUNDER VSS − 1.0 (tUNDER ≤ 50 ns) V
* : The parameter is based on VSS = 0.0 V.
WARNING: Semiconductor devices can be permanently damaged by application of stress (voltage, current,
temperature, etc.) in excess of absolute maximum ratings. Do not exceed these ratings.
Overshoot/Undershoot
t
UNDER ≤ 50 ns
IOVER ≤ VDD + 1.0 V
V
V
DD
Input pin
t
OVER ≤ 50 ns
V
IUNDER ≤ VSS − 1.0 V
V
SS
8
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