TDA6502 Datasheet, PDF (12/44 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
Preliminary specification
TDA6502; TDA6502A;
TDA6503; TDA6503A
Table 11 Digital outputs for analog input levels (note 1)
A2
A1
A0
0
0
0
0
0
1
0
1
0
0
1
1
1
0
0
Note
1. Accuracy is ±0.03 × V_CC.
VOLTAGE APPLIED TO PIN LOCK/ADC
0 to 0.15V_CC
0.15V_CC to 0.30V_CC
0.30V_CC to 0.45V_CC
0.45V_CC to 0.60V_CC
0.60V_CC to 1.00V_CC
8.2.4 POWER-ON RESET
The power-on detection threshold voltage V_POR is set to 3.2 V at room temperature. Below this threshold the device is
reset to the power-on state.
At power-on state the following actions take place:
• 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’
• The divider bit RSB is set to logic 1
• Port register UHF 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. Port registers VHFL and VHFH are ‘off’, which means that the VHF
tank circuit is operating in the VHF low sub-band. The tuning amplifier is switched off until the first transmission. In that
case, the tank circuit is supplied with the maximum tuning voltage. The oscillator is therefore operating at the end of
the VHF low sub-band.
Table 12 Default setting of the bits at Power-on reset
NAME
BYTE
MSB
Address byte
ADB
1
1
0
Divider byte 1
DB1
0
X
X
Divider byte 2
DB2
X
X
X
Control byte
CB
1
1
0
Band switch byte
BB
X
X
X
BITS
0
0
X
X
X
X
0
1
X
0
MA1
X
X
X
0
MA0
X
X
1
0
LSB
X
X
X
1
0
2000 Mar 16
12