ASAHI KASEI EMD CORPORATION
Low Power
Multiclock Generator with VCXO
AK8131S
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)
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.
Applications
Digital TV Sets
Personal Video Recorders
Set-Top-Boxes
Multi Media Receivers
Block Diagram
VDD
X1
Voltage
Controlled
Crystal
Oscillator
PLL1
PLL1
CLK1
X2
VIN
PLL2
Divide
Logic
and
Output
Control
CLK2
PLL3
S0
S1
S2
CLK3
CLK4
REFOUT
GND
AK8131S Multi Clock Generator
MS0688-E-01
-1-
Feb-08
AKM [ ASAHI KASEI MICROSYSTEMS ]
