TDA6500TT Datasheet, PDF (27/40 Pages) NXP Semiconductors – 5 V mixer/oscillator and synthesizer for PAL and NTSC standards

Philips Semiconductors
5 V mixer/oscillator and synthesizer
for PAL and NTSC standards
Product specification
TDA6500TT; TDA6501TT
11 APPLICATION INFORMATION
11.1 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 kΩ
which is connected to the tuning voltage supply rail. The
loop filter design depends on the oscillator characteristics
and the selected reference frequency.
11.2 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 crystal to the
ground is preferred, but it can also be connected to the
supply voltage.
11.3 Examples of I²C-bus sequences
Tables 13 to 18 show various write sequences where:
S = START
A = acknowledge
P = STOP.
Conditions:
f_osc = 100 MHz
P0 is on to switch on the low band
P3 is on
I_CP = 280 µA
f_step = 62.5 kHz
N = 1600
f_XTAL = 4 MHz
I_AGC = 245 nA
AGC take-over point is set to 112 dBµV asymmetrical.
For the complete sequence see Table 13 (sequence 1) or
Table 14 (sequence 2).
Other I²C-bus addresses may be selected by applying an
appropriate voltage to the AS input.
Table 13 Complete sequence 1
START
ADDRESS
BYTE
DIVIDER
BYTE 1
S
C2 A 06 A
DIVIDER
BYTE 2
40 A
CONTROL
BYTE
BAND
SWITCH
BYTE
CE A 09 A
CONTROL
BYTE
AUXILIARY
BYTE
STOP
DE A 20 A P
Table 14 Complete sequence 2
START
ADDRESS
BYTE
CONTROL
BYTE
AUXILIARY CONTROL
BYTE
BYTE
BAND
SWITCH
BYTE
S
C2 A DE A 20 A CE A 09 A
DIVIDER
BYTE 1
06 A
DIVIDER
BYTE 2
40 A
STOP
P
Table 15 Divider bytes only sequence
START
S
C2
ADDRESS BYTE
A
DIVIDER BYTE 1
06
A
DIVIDER BYTE 2
40
A
STOP
P
Table 16 Control and band switch bytes only sequence
START
S
C2
ADDRESS BYTE
A
CONTROL BYTE
CE
A
BAND SWITCH BYTE
09
A
STOP
P
2003 Jun 05
27