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
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Block diagram
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Automotive SG-9101CGA
- AEC-Q100 Compliant
- Operation temperature up to +125 °C, suitable for automotive applications
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Block diagram
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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 setting | 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.
