bt865a Conexant Systems, Inc., bt865a Datasheet - Page 56

• Manufacturer Part Number: bt865a
• Description: Ycrcb To Ntsc/pal Digital Video Encoder
• Manufacturer: Conexant Systems, Inc.

PC Board Considerations
Figure 3-1. Simplified Schematic
Table 3-1. Recommended Component Values
3-2
C1–C8
C9
L1
RSET
TRAP
RLOAD
GENERAL NOTE:
FOOTNOTE:
(1)
FOOTNOTE:
Resistor value is typically 75
Bt864A/865A
270 pF
1.8 µH
22 pF
Location
LPF
(1)
FSADJUST
The vendor numbers above are listed only as a guide. Substitution of devices with similar characteristics will not
affect the performance of the Bt864A/Bt865A.
Some modulators may require AC coupling capacitors (10 µF).
CVBS/G
CVBS/B
Y/CVBS
COMP
VBIAS
AGND
VREF
GND
VDD
VAA
300 pF
C/R
To Filter
C6
C8
Ω
C7
0.1
47
Ferrite Bead - Surface Mount
1% Metal Film Resistor (75
Ceramic Resonator
Schottky Diodes
1% Metal Film Resistor
. Conductance combined with the load equals that of a 37.5 Ω resistor.
C2
RSET
µ
µ
F Capacitor
GND
F Ceramic Capacitor
VAA
RLOAD
Schottky Diodes
Schottky Diodes
Description
C3-C5
Analog Power Plane
To Filter
RLOAD
Conexant
270 pF
(1)
1.8 µH
22 pF
Ω
)
RLOAD
300 pF
C9
Erie RPE112Z5U104M50V
Mallory CSR13F476KM
Fair-Rite 2743021447
Dale CMF-55C
Murata TPSx.xMJ or MB2 (where x.x = sound carrier
frequency in MHz)
BAT85 (BAT54F Dual) HP 5082-2305 (1N6263)
Siemens BAT 64-04 (Dual)
Dale CMF-55C
RLOAD
+
P
P
P
RF MODULATOR
82 Ω
75 Ω
RF MODULATOR
L1
Vendor Part Number
TRAP
C1
LPF
LPF
LPF
ZIN = 1 K
Modulator
Bt864A/Bt865A Data Sheet
VCC
Ground
(Power Supply
Connector)
Audio
47 µf
RF
(1)
To Video
Connector
RF
100138C
02/17/03
100138_030