ICS7152MI-02LF中文资料

ICS7152

Spread Spectrum Clock Generator

Description

The ICS7152-01, -02, -11, and -12 are clock

generators for EMI (Electro Magnetic Interference) reduction (see below for frequency ranges and

multiplier ratios). Spectral peaks can be attenuated by slightly modulating the oscillation frequency. Both down and center spread profiles are selectable. Center spread maintains an average frequency equal to an unspread clock. Down spread meets maximum frequency specs over the entire modualtion cycle.

Features

?Operating voltage of 3.3 V ±0.3 V ?Packaged in 8-pin SOIC

?Input frequency range of 16.6 to 134.0 MHz ?Output frequency range of 16.6 to 134.0 MHz ?

Provides a spread spectrum clock output (±0.5%, ±1.5% center spread; -1.0%, -3.0% down spread)

?Advanced, low-power CMOS process ?Industrial temperature range available ?Available in Pb (lead) free package

Block Diagram

Product Lineup

Product

Input Frequency Range

Modulation Type

Modulation Enable Pin

ICS7152M-01, ICS7152MI-0116.6 MHz to 67 MHz Down spread

Y es

ICS7152M-02, ICS7152MI-0240.0 MHz to 134.0 MHz ICS7152M-11, ICS7152MI-1116.6 MHz to 67.0 MHz Center spread

ICS7152M-12, ICS7152MI-12

40.0 MHz to 134.0 MHz

Spread Spectrum Clock Generator

Modulation Enable Setting Table

SEL Modulation Rate Setting Table

Frequency Setting Table

Pin Descriptions

XENS Pin 8Spread Spectrum

0ON 1

OFF

SEL Pin 4(note1)

Spread Direction

Spread Percentage (%)

Part Number

0Center ±0.5ICS7152M-11, ICS7152M-12Down

-1.0ICS7152M-01, ICS7152M-021Center ±1.5ICS7152M-11, ICS7152M-12Down

-3.0

ICS7152M-01, ICS7152M-02

FREQ Pin 7

Frequency

016.6 to 40 MHz ICS7152M-01, ICS7152M-1140 to 80 MHz

ICS7152M-02, ICS7152M-12133 to 67 MHz ICS7152M-01, ICS7152M-1166 to 134 MHz

ICS7152M-02, ICS7152M-12

Pin Number

Pin Name

Pin Type

Pin Description

1XIN Input Crystal resonator connection pin/clock input pin.2XOUT Output Crystal resonator connection pin.3GND Power Connect to ground.4SEL Input Modulation rate setting pin.5CKOUT Output Modulated clock output pin.6VDD Power Connect to +3.3 V.7FREQ Input Frequency setting pin.8

XENS

Output

Modulation enable setting pin.

Spread Spectrum Clock Generator

External Components

The ICS7152 requires a minimum number of external components for proper operation.

Decoupling Capacitor

A decoupling capacitor of 0.01μF must be connected between GND and VDD on pin 6, as close to this pin as possible. For optimum device performance, the decoupling capacitor should be mounted on the component side of the PCB. Avoid the use of vias in the decoupling circuit.

Series Termination Resistor

Series termination should be used on the clock output. To series terminate a 50? trace (a commonly used trace impedance) place a 27? resistor in series with the clock line, as close to the clock output pin as possible. The nominal impedance of the clock output is 25?.

PCB Layout Recommendations

For optimum device performance and lowest output phase noise, the following guidelines should be observed.

1) An optimum layout is one with all components on the same side of the board, minimizing vias through other signal layers. Other signal traces should be routed away from the ICS7152. This includes signal traces just underneath the device, or on layers adjacent to the ground plane layer used by the device.Crystal Information

The crystal used should be a fundamental mode, parallel resonant. Crystal capacitors should be connected from pins X1 to ground and X2 to ground to optimize the initial accuracy. The value of these capacitors is given by the following equation:

Crystal caps (pF) = (C L - 6) x 2

In the equation, C L is the crystal load capacitance. So, for a crystal with a 16 pF load capacitance, two 20 pF [(16-6) x 2] capacitors should be used.

Spread Spectrum Profile

The ICS7152 low EMI clock generator uses a triangular frequency modulation profile for optimal down stream tracking of zero delay buffers and other PLL devices. The frequency modulation amplitude is constant with variations of the input frequency.

Spread Spectrum Clock Generator

Absolute Maximum Ratings

Stresses above the ratings listed below can cause permanent damage to the ICS7152. These ratings, which are standard values for ICS commercially rated parts, are stress ratings only. Functional operation of the device at these or any other conditions above those indicated in the operational sections of the

specifications is not implied. Exposure to absolute maximum rating conditions for extended periods can affect product reliability. Electrical parameters are guaranteed only over the recommended operating temperature range.

Recommended Operation Conditions

Item

Rating

Supply Voltage, VDD

7 V

All Inputs and Outputs (referenced to GND)-0.5 V to VDD+0.5 V Ambient Operating Temperature -40 to +85°C Storage Temperature -55 to +125°C Junction Temperature -40 to +125°C Soldering Temperature 260°C

Overshoot (V IOVER )VDD + 1.0 V (t OVER < 50 ns) max Undershoot (V IUNDER )

GND - 1.0 V (t UNDER < 50 ns) min

Parameter

Min.

Typ.

Max.

Units

Ambient Operating Temperature

-40+85°C Power Supply Voltage (measured in respect to GND)

+3.0

3.3

3.6

V

Spread Spectrum Clock Generator

DC Electrical Characteristics

Unless stated otherwise, VDD = 3.3 V ±0.3 V, Ambient Temperature -40 to +85°C

Parameter Symbol Conditions Min.Typ.Max.Units Operating Voltage VDD 3.0 3.3 3.6V

Supply Current IDD No load, at 3.3 V1428mA Input High Voltage V IH SEL, FREQ, XENS VDD x 0.8VDD + 0.3V

XIN, Input slew rate

3 V/ns, 16.6 to 100

MHz

VDD x 0.8VDD + 0.3V

XIN, Input slew rate

3 V/ns, 100 to 134

MHz

VDD x 0.9VDD + 0.3V

Input Low Voltage V IL SEL, FREQ, XENS GND VDD x 0.20V

XIN, Input slew rate

3 V/ns, 16.6 to 100

MHz

GND VDD x 0.20V

XIN, Input slew rate

3 V/ns, 100 to 134

MHz

GND VDD x 0.10V

Output High Voltage V OH CKOUT, I OH = -4 mA VDD - 0.5VDD V

Output Low Voltage V OL CKOUT, I OL = 4 mA GND0.4V

Input Capacitance C IN XIN, SEL, XENS16pF

Load Capacitance C L CKOUT, 16.6 to 67

MHz

15pF

CKOUT, 67 to 100

MHz

10pF

CKOUT, 100 to 134

MHz

7pF

Output Impedance Z O CKOUT, 16.6 to 134

MHz 25?

Spread Spectrum Clock Generator

AC Electrical Characteristics

Unless stated otherwise, VDD = 3.3 V ±0.3 V, Ambient Temperature -40 to +85° C

Parameter Symbol Conditions Min.Typ.Max.Units Input Crystal Frequency16.640MHz Input Clock Frequency f IN ICS7152-01, -1116.667MHz

ICS7152-02, -1240134MHz Output Frequency f OUT CKOUT,

ICS7152-01, -11

16.667MHz

CKOUT,

ICS7152-02, -12

40134MHz Input Clock Duty Cycle t DCI XIN, 16.6 to 100 MHz405060%

XIN, 100 to 134 MHz455055% Output Clock Duty Cycle t DCC CKOUT, 1.5 V4060% Output Slew Rate CKOUT, 0.4 to 2.4 V,

CL = 15 pF

0.5 3.0V/ns

Cycle to Cycle Jitter t JC No load, spread off,

ICS7151-01, -02

150ps

No load, spread off,

ICS7151-11, -12

250ps

Power-up Time PLL lock-time from

power-up to 1% of final

value

25ms Modulation Frequency f MOD CKOUT33kHz

Spread Spectrum Clock Generator

Input Frequency (f IN = 1/t IN )

Output Slew Rate

Thermal Characteristics 8 SOIC

Parameter

Symbol

Conditions

Min.Typ.

Max.Units

Thermal Resistance Junction to Ambient

θJA

Still air 150°C/W θJA 1 m/s air flow 140°C/W θJA 3 m/s air flow

120°C/W Thermal Resistance Junction to Case

θJC

40

°C/W

Package dimensions are kept current with JEDEC Publication No. 95

Spread Spectrum Clock Generator

Ordering Information

Parts that are ordered with a "LF" suffix to the part number are the Pb-Free configuration and are RoHS compliant.While the information presented herein has been checked for both accuracy and reliability, Integrated Circuit Systems (ICS) assumes no responsibility for either its use or for the infringement of any patents or other rights of third parties, which would result from its use. No other circuits, patents, or licenses are implied. This product is intended for use in normal commercial applications. Any other applications such as those requiring extended temperature range, high reliability, or other extraordinary environmental requirements are not recommended without additional processing by ICS. ICS reserves the right to change any circuitry or specifications without notice. ICS does not authorize or warrant any ICS product for use in life support devices or critical medical instruments.

Part / Order Number

Marking

Shipping Packaging

Package

Temperature

ICS7152M-017152M-01Tubes 8-pin SOIC 0 to +70° C ICS7152M-01T 7152M-01Tape and Reel

8-pin SOIC 0 to +70° C ICS7152M-01LF 7152M01L Tubes 8-pin SOIC 0 to +70° C ICS7152M-01LFT 7152M01L Tape and Reel

8-pin SOIC 0 to +70° C ICS7152MI-017152MI01Tubes 8-pin SOIC -40 to +85° C ICS7152MI-01T 7152MI01Tape and Reel

8-pin SOIC -40 to +85° C ICS7152MI-01LF 7152I01L Tubes 8-pin SOIC -40 to +85° C ICS7152MI-01LFT 7152I01L Tape and Reel

8-pin SOIC -40 to +85° C ICS7152M-027152M-02Tubes 8-pin SOIC 0 to +70° C ICS7152M-02T 7152M-02Tape and Reel

8-pin SOIC 0 to +70° C ICS7152M-02LF 7152M02L Tubes 8-pin SOIC 0 to +70° C ICS7152M-02LFT 7152M02L Tape and Reel

8-pin SOIC 0 to +70° C ICS7152MI-027152MI02Tubes 8-pin SOIC -40 to +85° C ICS7152MI-02T 7152MI02Tape and Reel

8-pin SOIC -40 to +85° C ICS7152MI-02LF 7152I02L Tubes 8-pin SOIC -40 to +85° C ICS7152MI-02LFT 7152I02L Tape and Reel

8-pin SOIC -40 to +85° C ICS7152M-117152M-11Tubes 8-pin SOIC 0 to +70° C ICS7152M-11T 7152M-11Tape and Reel

8-pin SOIC 0 to +70° C ICS7152M-11LF 7152M11L Tubes 8-pin SOIC 0 to +70° C ICS7152M-11LFT 7152M11L Tape and Reel

8-pin SOIC 0 to +70° C ICS7152MI-117152MI11Tubes 8-pin SOIC -40 to +85° C ICS7152MI-11T 7152MI11Tape and Reel

8-pin SOIC -40 to +85° C ICS7152MI-11LF 7152I11L Tubes 8-pin SOIC -40 to +85° C ICS7152MI-11LFT 7152I11L Tape and Reel

8-pin SOIC -40 to +85° C ICS7152M-127152M-12Tubes 8-pin SOIC 0 to +70° C ICS7152M-12T 7152M-12Tape and Reel

8-pin SOIC 0 to +70° C ICS7152M-12LF 7152M12L Tubes 8-pin SOIC 0 to +70° C ICS7152M-12LFT 7152M12L Tape and Reel

8-pin SOIC 0 to +70° C ICS7152MI-127152MI12Tubes 8-pin SOIC -40 to +85° C ICS7152MI-12T 7152MI12Tape and Reel

8-pin SOIC -40 to +85° C ICS7152MI-12LF 7152I12L Tubes 8-pin SOIC -40 to +85° C ICS7152MI-12LFT

7152I12L

Tape and Reel

8-pin SOIC

-40 to +85° C