Protection against noise - Spread Spectrum function Programmable SPXO "SG-9101 series"

Overview

SG-9101 series are programmable SPXO with Spread Spectrum (SS) function to reduce EMI. SS options are selectable by youeselves to support each design. It is able to program any frequency and SS options by yourselves with programming tool ( SG-Writer II )
> Spread Spectrum options <
- Spread width : 6 types
- Spread type : 2 types
- Modulation frequency : 4 types
- Spread profile : 3 types

Series lineup

General : SG-9101CG/CE/CB/CA

Item Specifications
Frequency(fo) 0.67 MHz to 170 MHz
Supply voltage 1.62 V to 3.63 V
Frequency tolerance​ / Operation
temperature
±50 x 10-6 / -40 ℃ to +125 ℃
* Including includes Initial frequency tolerance, Frequency / temperature characteristics, Frequency / voltage coefficient, Frequency / load coefficient. and Aging(+25 °C, First year)
Current consumption 3.7 mA Max.(fo = 20 MHz)
8.3 mA Max.(fo = 170 MHz)
Function Output enable (OE)
or Stand-by(ST)​
Package size
lineup[mm]
CG : 2.5 x 2.0, CE : 3.2 x 2.5
CB : 5.0 x 3.2, CA : 7.0 x 5.0

Block diagram

Automotive SG-9101CGA

- AEC-Q100 Compliant
- Operation temperature up to +125 °C, suitable for automotive applications

Item Specifications
Frequency(fo) 0.67 MHz to 170 MHz
Supply voltage 1.62 V to 3.63 V
Frequency tolerance​ /
Operation
temperature
±50 x 10-6 / -40 ℃ to +105 ℃
±100 x 10-6 / +105 ℃ to +125 ℃
* Including includes Initial frequency tolerance, Frequency / temperature characteristics, Frequency / voltage coefficient, Frequency / load coefficient. and Aging(+25 °C, First year)
Current consumption 3.8 mA Max.(fo = 20 MHz)
8.4 mA Max.(fo = 170 MHz)
Function Output enable (OE)
or Stand-by(ST)​
Package size 2.5 x 2.0 mm

Block diagram

Features

What is Spread Spectrum?

This is one of the technologies to reduce the EMI. When frequency modulation is applied to the output, the spectrum peaks of fundamental and harmonics are suppressed.
SG-9101 series features integrated SS function module


SS OFF

Spectrum peak
Fundamental : 11.3 dBm
3rd Harmonics : -1.5 dBm

SS ON

Spectrum peak
Fundamental : 2.3 dBm
3rd Harmonics : -12.2 dBm

Options of each Features

Example of how oscilator's EMI is reduced with SS fuction

The EMI of fundamental and harmonics frequency is reduced when SS ON.

SS OFF

SS ON

Options of Spread Spectrum

These options are selectable according to customer’s design.
The electrical characteristics including current consumption and cycle jitter are no different for these options.

Spread type Spread width Modulation
frequency
Spread profile
Center Down
C:Center 02:±0.25 % 05:-0.5 % A:25.4 kHz A:Hershey-kiss
D:Down 05:±0.5 % 10:-1.0 % B:12.7 kHz B:Sine-wave
- 07:±0.75 % 15:-1.5 % C:8.5 kHz C:Triangle
- 10:±1.0 % 20:-2.0 % D:6.3 kHz -
- 15:±1.5 % 30:-3.0 % - -
- 20:±2.0 % 40:-4.0 % - -

Spread width and Spectrum (Center spread, Triangle)

The wider spread width, results in lower spectrum

Spectrum peak : -21 dB

Spectrum peak : -22 dB

Spectrum peak : -18 dB

Spectrum peak : -17 dB

Spectrum peak : -15 dB

Spectrum peak : -12 dB

Modulation freq. and Spectrum (Center spread, Triangle)

The higher modulation freq., results in lower spectrum

Spectrum peak : -21 dB

Spectrum peak : -24 dB

Spectrum peak : -25 dB

Spectrum peak : -27 dB

Spread profile and Spectrum (Center spread, 25.4 kHz)

Triangle profile has the lowest spectrum

No spread spectrum

Hershey-kiss

Spectrum density near center frequency is larger than other region
Spectrum peak : -20 dB

Sine-wave

Spectrum density near edge is larger than other region
Spectrum peak : -17 dB

Triangle

Spectrum density forms flat in the range of spread width
Spectrum peak : -21 dB

Options of each feature

Option of Standby or Output enable function

  #1 : Hight #1 : Low Feature
Output Oscilator
S : Standby Specified frequency output Low level
(weak pull-down)
Stop oscilator Lowest current consumption
P : Output enable Oscilator Fast enable time

Option of tr / tf specification

Customer can choose tr / tf according to input device spec

tr / tf 設定 tr / tf Condition
A : Default 3 ns Max. fo > 40 MHz
6 ns Max. fo ≤ 40 MHz
B : Fast* 3 ns Max. Full frequency range
C : Slow 10 ns Max. fo ≤ 20 MHz

* Default and fast setting is same spec at fo > 40 MHz

Notes for #1 pin function:
SG-9101 series #1 pin is not designed for “Open” status use.
Please apply “High” level voltage to #1 pin when enable output.

  #1 pin status Function
#1 : OE or ST High Output enable
Open No guarantee
Low Output disabled (OE)
or Stand-by (ST)

Frequency・Options

Customer can program the frequency and options to the blank samples of SG-9101 series with field oscillator programmer SG-Writer II. You can also choose Standby or Output enable function and of tr / tf specification.
For more information, click here.