bt865a Conexant Systems, Inc., bt865a Datasheet - Page 12

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

Circuit Description
Table 1-1.
1-2
FIELD
SLEEP
SDA
SCL
VDD3V
CVBS/B
AGND (CVBS/B)
CVBS/G
AGND (CVBS/G)
C/R
AGND (C/R)
Y/CVBS
AGND (Y/CVBS)
FSADJUST
VBIAS
VREF
COMP
VAA
VDD
AGND
GND
FOOTNOTE:
(1)
Pin Name
Any unused inputs should not be left floating.
Pin Assignments (2 of 2)
I/O
I/O
O
O
O
O
O
O
O
O
–
–
–
–
I
I
I
I
15
39
40
41
44
8
6
10
7
12
9
13
11
1
2
3
5
4
37, 23, 46
51, 52
22, 36, 45
Pin #
Full-scale adjust control pin. A resistor (RSET) connected between this pin and GND
Field control output (TTL compatible). FIELD transitions after the rising edge of CLK, two
clock cycles following falling VSYNC*. It is a logical zero during FIELD 1 and is a logical
one during FIELD 2.
Power-down control input (TTL compatible). A logical one configures the device for
power-down mode. A logical zero configures the device for normal operation. This pin
may be connected directly to VDD or GND.
Serial interface data input/output (TTL compatible). Data is written to and read from the
device via this serial bus.
Serial interface clock input (TTL compatible). The maximum clock rate is 100 kHz.
Input threshold adjustment. When low, indicates nominal supply voltage of 5 volts.
When high, indicates nominal supply voltage of 3.3 volts.
Composite video or Blue (with blanking and sync, and optionally, Macrovision encoding).
Optional luma delay channel for composite video output.
Analog ground for pin CVBS/B.
Composite video or Green (with blanking and sync, and optionally, Macrovision encoding).
Analog ground for pin CVBS/G.
Modulated chrominance, or Red.
Analog ground for pin C/R.
Luminance or composite video (with blanking, sync, and optionally, Macrovision
encoding, and/or closed-captioning encoding).
Analog ground for pin Y/CVBS.
controls the full-scale output current on the analog outputs. For standard operation, use
the nominal RSET values shown under Recommended Operating Conditions.
DAC bias voltage. A 0.1 µF ceramic capacitor must be used to decouple this pin to GND.
The capacitor must be as close to the device as possible to keep lead lengths to an
absolute minimum.
Voltage reference pin. A 0.1 µF ceramic capacitor must be used to decouple this pin to
GND. The capacitor must be as close to the device as possible to keep lead lengths to an
absolute minimum.
Compensation pin. A 0.1 µF ceramic capacitor must be used to decouple this pin to VAA.
The capacitor must be as close to the device as possible to keep lead lengths to an
absolute minimum.
Analog power. Refer to PC Board Considerations section of this document.
Digital power. Refer to the PC Board Considerations section of this document.
Analog ground. Refer to the PC Board Considerations section of this document.
Digital ground. Refer to the PC Board Considerations section of this document.
Conexant
Description
Bt864A/Bt865A Data Sheet
100138C
02/17/03