tda6403a NXP Semiconductors, tda6403a Datasheet - Page 28

• Manufacturer Part Number: tda6403a
• Description: 5 V Mixers/oscillators And Synthesizers For Cable Tv And Vcr 2-band Tuners
• Manufacturer: NXP Semiconductors

Philips Semiconductors
Table 18 Crystal
Table 19 Transistors
Tuning amplifier
The tuning amplifier is capable of driving the varicap
voltage without an external transistor. The tuning voltage
output must be connected to an external load of 27 k
which is connected to the tuning voltage supply rail.
The loop filter design depends on the oscillator
characteristics and the selected reference frequency.
Crystal oscillator
The crystal oscillator uses a 4 MHz crystal connected in
series with an 18 pF capacitor thereby operating in the
series resonance mode. Connecting the oscillator to the
supply voltage is preferred, but it can also be connected to
ground.
Table 20 Complete sequence 1
Table 21 Complete sequence 2
Table 22 Divider bytes only sequence
Table 23 Control and band switch bytes only sequence
Table 24 Control byte only sequence
2000 Jan 24
X1
TR1
TR2
START ADDRESS BYTE DIVIDER BYTE 1 DIVIDER BYTE 2 CONTROL BYTE
START ADDRESS BYTE CONTROL BYTE
5 V mixers/oscillators and synthesizers for
cable TV and VCR 2-band tuners
S
S
S
S
S
COMPONENT
COMPONENT
C2
C2
C2
C2
C2
A
A
A
CE
A
A
06
4 MHz
BC847B
BC847B
A
A
CE
CE
06
40
09
VALUE
VALUE
A
A
A
A
A
BAND SWITCH
P
40
09
P
P
BYTE
28
Examples of I
TDA6402 and TDA6403
Tables 20 to 24 show the various sequences where:
For the complete sequence see Table 20 (sequence 1) or
Table 21 (sequence 2).
Table 25 Status byte acquisition
Notes
1. XX = Read status byte.
2. X = No acknowledge from the master means end of
f
PVHFL = ‘ON’ to switch on VHF I
FMST is ‘ON’ to switch on an FM sound trap
I
N = 512
f
S = START
A = acknowledge
P = STOP.
A
A
OSC
CP
XTAL
sequence.
S
= 280 A
= 100 MHz
= 4 MHz
DIVIDER BYTE 1 DIVIDER BYTE 2
CE
06
C3
2
C-bus sequences (SW = V
TDA6402; TDA6402A;
A
A
TDA6403; TDA6403A
A
BAND SWITCH
XX
09
40
(1)
BYTE
Product specification
X
A
A
(2)
CC
) for
STOP
STOP
P
P
P