TDA6402 Datasheet, PDF (12/40 Pages) NXP Semiconductors – 5 V mixers/oscillators and synthesizers for cable TV and VCR 2-band tuners

Philips Semiconductors
5 V mixers/oscillators and synthesizers for
cable TV and VCR 2-band tuners
Product specification
TDA6402; TDA6402A;
TDA6403; TDA6403A
POWER-ON RESET
The power-on detection threshold voltage V_POR is set to
V_CC = 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 ‘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.
If the first sequence transmitted to the device
has 18 or 19 bits, the reference divider ratio is set to 512
or 1024, depending on the sequence length.
If the sequence has 27 bits, the reference divider ratio is
fixed by RSA and RSB bits (see Table 8).
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DATA
DA
BAND SWITCH
DATA
FMST PVHFL
FREQUENCY
DATA
PUHF PVHFH
N13 N12 N11 N10 N9 N8 N7 N6 N5 N4 N3 N2 N1 N0
INVALID
DATA
1
45
18
CL
CE
LOAD BAND SWITCH
REGISTER
LOAD FREQUENCY
REGISTER
MGE693
Fig.4 Normal mode; 18-bit data format (RSA = 1).
2000 Jan 24
12