TSA5527AM Ver la hoja de datos (PDF) - Philips Electronics
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TSA5527AM Datasheet PDF : 28 Pages
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Philips Semiconductors
1.3 GHz universal bus-controlled
TV synthesizers
Product specification
TSA5526; TSA5527
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 kΩ
which is connected to the tuning voltage supply rail.
Figs 11 and 12 show a possible loop filter. The component
values depend 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, however, also be
connected to ground.
Examples of I2C-bus sequences (SW = LOW)
Tables 10 to 14 show the various sequences where fosc = 100 MHz, BS4 = ON, ICP = 280 µA, N = 512, fxtal = 4 MHz,
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 10 (sequence 1) or Table 11 (sequence 2).
Table 10 Complete sequence 1
S
C2
A
06
A
40
A
CE
A
08
A
P
Table 11 Complete sequence 2
S
C2
A
CE
A
08
A
06
A
40
A
P
Table 12 Divider bytes only sequence
S
C2
A
06
A
40
A
P
Table 13 Control and band switch bytes only sequence
S
C2
A
CE
A
08
A
P
Table 14 Control byte only sequence
S
C2
A
CE
A
P
Other sequences are not allowed in the write mode.
Table 15 One status byte acquisition
S
C3
A
XX(1)
X(2)
P
Notes
1. XX = the read status byte.
2. X = no acknowledge from the master means end of sequence.
1996 Sep 24
17
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