tsa5520 NXP Semiconductors, tsa5520 Datasheet - Page 16

• Manufacturer Part Number: tsa5520
• Description: 1.3 Ghz Universal Bus-controlled Tv Synthesizer
• Manufacturer: NXP Semiconductors

Philips Semiconductors
APPLICATION INFORMATION
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.
Figures 11 and 12 show a possible loop filter.
The component values depend on the oscillator
characteristics and the selected reference frequency.
Examples of I
Tables 8 to 12 show the various sequences where f
S = START, A = acknowledge and P = STOP. The sequence is as follows:
START + address byte + divider byte 1 + divider byte 2 + control byte + band switch byte + STOP.
For the complete sequence see Table 8 (sequence 1) or Table 9 (sequence 2).
Table 8 Complete sequence 1
Table 9 Complete sequence 2
Table 10 Divider bytes only sequence
Table 11 Control and band switch bytes only sequence
Table 12 Control byte only sequence
Other I
to the CE input.
Examples of 3-wire bus sequences (TSA5520; SW = OPEN)
Table 13 18-bit sequence (f
Table 14 19-bit sequence (f
The reference divider is automatically set to 512 unless RSB has been programmed to 0 during a 27-bit sequence.
1996 Oct 10
1.3 GHz universal bus-controlled
TV synthesizer
0
1
S
S
S
S
2
C-bus sequences are not allowed. Other I
1
S
0
C2
C2
2
0
C-bus sequences (SW = LOW)
0
C2
C2
0
0
A
A
1
osc
osc
C2
1
= 800 MHz, BS4 = ON)
= 650 MHz, BS3 = ON)
CE
06
0
1
A
A
1
0
A
A
0
A
2
0
C-bus addresses may be selected by applying an appropriate voltage
CE
06
osc
0
40
08
= 100 MHz, BS4 = ON, I
1
16
0
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, however, also be
connected to ground.
0
A
A
1
A
A
CE
0
0
CE
06
0
1
CP
40
08
0
= 280 A, N = 512, f
A
A
0
TSA5520; TSA5521
A
0
0
08
40
0
A
A
0
Product specification
0
xtal
0
A
A
= 4 MHz,
P
0
0
P
P
P
P
0
0