TDA6405ATS datasheet(9/32 Pages) PHILIPS

9 / 32 page

1999 Jan 13

Philips Semiconductors

Product speciﬁcation

5 V mixer/oscillator-PLL synthesizers for

hyperband tuners

TDA6404; TDA6405;

TDA6405A

Table 7

Read data format

Note

1. MSB is transmitted first.

Table 8

Description of symbols used in Table 7

Table 9

Analog-to-digital converter levels; note 1

Note

1. Accuracy is

±0.03VCC.

NAME

BYTE

BITS

ACK

MSB(1)

LSB

Address byte

ADB

1000

MA1

MA0

R/W=1

Status byte

POR

ACPS

−

SYMBOL

DESCRIPTION

acknowledge

POR

Power-on reset ﬂag (POR = 1 at power-on)

in-lock ﬂag (FL = 1 when the loop is locked)

ACPS

automatic charge pump switch ﬂag:

ACPS = 0; active

ACPS = 1; not active

A2, A1 and A0

digital outputs of the 5-level ADC (see Table 9)

VOLTAGE APPLIED ON ADC INPUT

0.60VCC to 1.00VCC

0.45VCC to 0.60VCC

0.30VCC to 0.45VCC

0.15VCC to 0.30VCC

0 to 0.15VCC

Power-on reset

The power-on detection threshold voltage VPOR is set to

VCC = 2 V at room temperature. Below this threshold, the

device is reset to the power-on state.

At power-on state, the charge pump current is set to

280

µA, the tuning voltage output is disabled, the test

bits T2, T1 and T0 are set to logic 001 (automatic charge

pump switch ‘ON’) and RSB is set to logic 1.

PUHF is ‘OFF’, which means that the UHF oscillator and

the UHF mixer are switched off. Consequently, the VHF

oscillator and the VHF mixer are switched on. PVHFL and

PVHFH are ‘OFF’, which means that the VHF tank circuit

is working in the VHF I sub-band. The tuning amplifier is

switched off until the first transmission. In that case, the

tank circuit in VHF I is supplied with the maximum tuning

voltage. The oscillator is therefore working at the end of

the VHF I sub-band.

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