cx25870 Conexant Systems, Inc., cx25870 Datasheet - Page 133

• Manufacturer Part Number: cx25870
• Description: Video Encoder With Adaptive Flicker Filtering And Hdtv Output
• Manufacturer: Conexant Systems, Inc.

CX25870/871
Flicker-Free Video Encoder with Ultrascale Technology
Figure 3-2. Connection Diagram for Output Filters and Other Key Passive Components/Standard Definition TV Out Only
100381B
+1.1 V to
+1.8 V
Note(s):
(1)
(2)
(3)
10
K
1%
10
K
1%
VDDL VDD_CO, VDD_VREF must be tied to 3.3 V CX25870/871 Power Plane unless interface to low power graphics
Depending on the parasitic capacitance of your PCB and loading expectations of your crystals, these capacitor values
may change slightly. Generally, the 27 pF and 33 pF combination matches a 20 pF internal XTAL load.
No RF Modulator has been included on any of the DAC outputs. Baseband video is always generated by the CX25870.
controller is required.
27 pF
VDDL
VDD_CO
VDD_VREF
5%
(2)
XTALIN
,
CX25870/871
(1)
(1)
FSADJUST
XTALOUT
(1)
COMP
VBIAS
DACC
DACD
VREF
DACA
DACB
GND
VAA
13.500 MHz XTAL
33 pF
5%
DAC Output
(2)
,
RSET =
75 ,1%
C7
C8
C9
CX25870/871 Power Plane
75
1%
C2–C6
GND
P :
VAA
Conexant
Schottky Diodes
Schottky Diodes
75
1%
To Filter
75
1%
75
1%
P
P
P
P
+
C10
FB
270 pF, 5%
1.8 µH, 5%
22 pF, 5%
3.0 PC Board Considerations
SD LPF
SD LPF
SD LPF
SD LPF
3.2 Power and Ground Planes
SD LPF
C1
+3.3 V (VCC)
Ground
(Power Supply
Connector)
330 pF,
5%
To Video
Connector
100381_018a
3-3