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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)： | 40/48頁 |
| 文件大小： | 242K |
| 代理商： | 935263935118 |
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TDA6502; TDA6502A;
TDA6503; TDA6503A
Information as of 2000-08-29
TDA6502; TDA6502A; TDA6503; TDA6503A; 5 V mixers/oscillators and synthesizers for cable TV and VCR 2-band
tuners
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Description
The TDA6502, TDA6502A, TDA6503 and TDA6503A are programmable 2-band mixers/oscillators and synthesizers
intended for VHF/UHF TV and VCR tuners.
Partitioning of the bands is up to the customer as long as VHF is below 500 MHz and UHF is below 900 MHz.
The devices include two double balanced mixers and two oscillators for the VHF and UHF band respectively, an IF
amplifier and a PLL synthesizer. The VHF band can be split-up into two sub-bands using a proper oscillator application and
a switchable inductor.
Two pins are available between the mixer output and the IF amplifier input to enable IF filtering for improved signal
handling.
The port register provides four PMOS ports. Band selection is provided by port register UHF. When port register UHF is
‘on’, the UHF mixer-oscillator is active and the VHF band is switched off. When port register UHF is ‘off’, the VHF mixer-
oscillator is active and the UHF band is off. Port registers VHFL and VHFH are used to select the VHF sub-bands. Port
register FMST is a general purpose port, that can be used to switch an FM sound trap. When the ports are used, the sum
of the drain currents has to be limited to 30 mA.
The synthesizer consists of a 15-bit programmable divider, a crystal oscillator and its programmable reference divider and
a phase comparator (phase/frequency detector) combined with a charge pump which drives the tuning amplifier, including
the 33 V output at pin VT. Depending on the reference divider ratio (64, 80 or 128), the phase comparator operates at 62.5,
50 or 31.25 kHz with a 4 MHz crystal.
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