tda6403a NXP Semiconductors, tda6403a Datasheet - Page 12

• Manufacturer Part Number: tda6403a
• Description: 5 V Mixers/oscillators And Synthesizers For Cable Tv And Vcr 2-band Tuners
• Manufacturer: NXP Semiconductors

Philips Semiconductors
P
The power-on detection threshold voltage V
V
device is reset to the power-on state.
At power-on state, the charge pump current is set to
280 A, 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
2000 Jan 24
handbook, full pagewidth
OWER
CC
5 V mixers/oscillators and synthesizers for
cable TV and VCR 2-band tuners
= 2 V at room temperature. Below this threshold, the
DA
CL
CE
-
ON RESET
INVALID
DATA
PUHF
1
BAND SWITCH
FMST
DATA
PVHFH
LOAD BAND SWITCH
PVHFL
REGISTER
Fig.4 Normal mode; 18-bit data format (RSA = 1).
4
N13 N12 N11 N10
5
POR
is set to
N9
12
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).
N8
FREQUENCY
N7
DATA
N6
N5
N4
TDA6402; TDA6402A;
TDA6403; TDA6403A
N3
N2
N1
LOAD FREQUENCY
Product specification
REGISTER
N0
18
INVALID
DATA
MGE693