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PDF AK8138C Data sheet ( Hoja de datos )

Número de pieza AK8138C
Descripción Multi Clock Generator
Fabricantes AKM 
Logotipo AKM Logotipo



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AK8138C
Low power
Multiclock Generator with VCXO
AK8138C
Features
27MHz Crystal Input
Four Frequency-Selectable Clock Outputs
One 27MHz-Reference Output
Selectable Clock out Frequencies:
- 74.1758, 74.250MHz
- 25.000MHz
- 4.9152, 12.000, 24.000,24.576MHz
- 33.333MHz
Built-in VCXO
- Pull Range: ±110ppm (Min.)
Low Jitter Performance
- Period Jitter:
150 psec (Typ.) at CLK1-4
- Long Term Jitter :
0.85ns (Typ.) 74.1758MHz
160 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 AK8138C is a member of AKMs low power
multi clock generator family designed for a feature
rich DTV or STB, requiring a range of system
clocks with high performance. The AK8138C
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 ±110 ppm for
synchronizing to the external clock system. Both
circuitries of VCXO and PLL in AK8138C are
derived from AKMs long-term-experienced clock
device technology, and enable clock output to
perform low jitter and to operate with very low
current consumption. The AK8138C 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
X2 Oscillator
VIN
S0
S1
S2
PLL1
PLL1
PLL2
PLL3
Divide
Logic
and
Output
Control
CLK1
CLK2
CLK3
CLK4
REFOUT
GND
AK8138C Multi Clock Generator
MS1137-E-02
-1-
Dec-2013
http://www.Datasheet4U.com

1 page




AK8138C pdf
Output clock frequency selection
AK8138C
The AK8138C generates a range of low-jitter and hi-accuracy clock frequencies with three built-in PLLs
and provides to up to four assigned outputs. A frequency selection at assigned output pin is configured by
pin-setting of S0 (Pin2), S1 (Pin3), and S2 (Pin14).
The selectable frequency is shown in Table 1..
Table 1: Clock output Frequency
Selection Pin
S2
(Pin 14)
L
L
L
L
H
H
H
H
S1
(Pin 3)
L
L
H
H
L
L
H
H
S0
(Pin 2)
L
H
L
H
L
H
L
H
CLK1
(Pin 7)
74.250
74.250
74.1758
74.1758
74.250
74.250
74.1758
74.1758
Clock Output Frequency (MHz)
CLK2
(Pin 8)
25.000
25.000
25.000
25.000
25.000
OFF
25.000
25.000
CLK3
(Pin 10)
24.000
12.000
24.000
12.000
24.576
24.000
24.576
4.9152
CLK4
(Pin 11)
33.333
33.333
33.333
33.333
33.333
33.333
33.333
33.333
Voltage Control Crystal Oscillator (VCXO)
The AK8138C has a voltage control crystal oscillator (VCXO), featuring fine frequency tuning for 27MHz of
primary clock frequency by external DC voltage control. This tuning enables output clock frequency to
synchronize the external clock system. VIN (Pin 4) accepts DC voltage control from a processor or a
system controller, and pulls the primary frequency of crystal to higher or lower. This pulling range is
determined by crystal characteristic, on-chip load capacitor, and stray capacitance of PCB. The AK8138C
is designed to range ±110ppm of primary frequency in AKMs authorized condition, and the typical pulling
profile is shown in Figure 1. For details about the condition and other specific crystal application case,
refer the AK8138 Family application note.
27.0[MHz] VCXO Characteristics
NDK : NX5032GA <CL=7.5[pF]> (Cext1=10[pF], Cext2=1[pF])
200.0
150.0
100.0
50.0
0.0
0 0.5 1 1.5 2 2.5 3
-50.0
-100.0
-150.0
-200.0
VIN [V]
3.5
Figure 1: Typical VCXO Pulling Profile
MS1137-E-02
-5-
Dec-2013

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