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參數(shù)資料
| 型號： | 935263935118 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 調(diào)諧器 |
| 英文描述： | 2-BAND, VIDEO TUNER, PDSO28 |
| 封裝： | PLASTIC, SOT-341, SSOP-28 |
| 文件頁數(shù)： | 4/48頁 |
| 文件大?。?/td> | 242K |
| 代理商： | 935263935118 |
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2000 Aug 02
12
Philips Semiconductors
Product specication
5 V mixers/oscillators and synthesizers for
cable TV and VCR 2-band tuners
TDA6502; TDA6502A;
TDA6503; TDA6503A
Table 11 Output of ADC (note 1)
Note
1. Accuracy is
±0.03 × V
CC.
8.2.4
POWER-ON RESET
The power-on detection threshold voltage VPOR 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 A
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 thus 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
A2
A1
A0
VOLTAGE APPLIED TO PIN LOCK/ADC
0
0 to 0.15VCC
0
1
0.15VCC to 0.30VCC
0
1
0
0.30VCC to 0.45VCC
0
1
0.45VCC to 0.60VCC
1
0
0.60VCC to 1.00VCC
NAME
BYTE
BIT
MSB
LSB
Address byte
ADB
1
0
MA1
MA0
X
Divider byte 1
DB1
0
XXXXXXX
Divider byte 2
DB2
XXXXXXXX
Control byte
CB
1
0
1
X
1
Band switch byte
BB
XXXX
0000
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