描述 Description

The AK8131S is a member of AKEMD’s low power multi clock generator family designed for a feature rich DTV or STB, requiring a range of system clocks with high performance. The AK8131S generates different frequency clocks from a 27MHz crystal oscillator and provides them to up to four outputs configured by pin-setting. The on-chip VCXO accepts a voltage control input to allow the output clocks to vary by ±100 ppm for synchronizing to the external clock system. Both circuitries of VCXO and PLL in AK8131S are derived from AKEMD’s long-term-experienced clock device technology, and enable clock output to perform low jitter and to operate with very low current consumption. The AK8131S is available in a 16-pin SSOP package.

特性 Features

■ 27MHz Crystal Input

■ Four Frequency-Selectable Clock Outputs

■ One 27MHz-Reference Output

■ Selectable Clock out Frequencies:

- 74.1758, 74.250,55.00,51.875,68.333MHz

- 74.250,66.000,82.000MHz

- 27.000,54.000MHz

- 27.000MHz

■ Built-in VCXO

- Pull Range: ±100ppm (Min.)

■ Low Jitter Performance

- Period Jitter:

150 psec (Typ.) at CLK1-4

- Long Term Jitter :

150 psec (Typ.) at REFOUT

■ Low Current Consumption: 16.5mA (Typ.) at 3.3V

■ Supply Voltage: 3.0 – 3.6V

■ Operating Temperature Range: -20 to +85℃

■ Package: 16-pin SSOP (Lead free)

Applications

■ Digital TV Sets

■ Personal Video Recorders

■ Set-Top-Boxes

■ Multi Media Receivers