TDA6402 datasheet(28/40 Pages) PHILIPS

28 / 40 page

2000 Jan 24

Philips Semiconductors

Product speciﬁcation

5 V mixers/oscillators and synthesizers for

cable TV and VCR 2-band tuners

TDA6402; TDA6402A;

TDA6403; TDA6403A

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

Ω

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.

Examples of I2C-bus sequences (SW = VCC) for

TDA6402 and TDA6403

Tables 20 to 24 show the various sequences where:

fOSC = 100 MHz

PVHFL = ‘ON’ to switch on VHF I

FMST is ‘ON’ to switch on an FM sound trap

ICP = 280 µA

N = 512

fXTAL = 4 MHz

S = START

A = acknowledge

P = STOP.

For the complete sequence see Table 20 (sequence 1) or

Table 21 (sequence 2).

COMPONENT

VALUE

4 MHz

COMPONENT

VALUE

TR1

BC847B

TR2

BC847B

Table 20 Complete sequence 1

Table 21 Complete sequence 2

START

ADDRESS BYTE DIVIDER BYTE 1 DIVIDER BYTE 2 CONTROL BYTE

BAND SWITCH

BYTE

STOP

A40A

A09A

START

ADDRESS BYTE CONTROL BYTE

BAND SWITCH

BYTE

DIVIDER BYTE 1 DIVIDER BYTE 2

STOP

A09A06A40A

Table 22 Divider bytes only sequence

Table 23 Control and band switch bytes only sequence

Table 24 Control byte only sequence

Table 25 Status byte acquisition

Notes

1. XX = Read status byte.

2. X = No acknowledge from the master means end of

sequence.

06A40A

SC2A

SC3A

XX(1)

X(2)

TDA6402 Datasheet(PDF) 28 Page - NXP Semiconductors

TDA6402 Datasheet(HTML) 28 Page - NXP Semiconductors

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40

Datasheet Download

Link URL