參數(shù)資料
型號(hào)： 935260937118
廠商： NXP SEMICONDUCTORS
元件分類： 消費(fèi)家電
英文描述： SPECIALTY CONSUMER CIRCUIT, PDSO28
封裝： PLASTIC, SOT-341, SSOP-28
文件頁(yè)數(shù)： 27/37頁(yè)
文件大?。?/td> 296K
代理商： 935260937118
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TDA6404; TDA6405;
TDA6405A
TDA6404; TDA6405;
TDA6405A
Information as of 2000-08-19
TDA6404; TDA6405; TDA6405A; 5 V mixer/oscillator-PLL synthesizers for hyperband tuners
The TDA6404, TDA6405 and TDA6405A are programmable 2-band mixer/oscillator-PLL synthesizers intended for VHF/UHF and
hyperband tuners.
The devices include two double balanced mixers and two oscillators for the VHF and UHF band, an IF amplifier and a PLL synthesizer.
With proper oscillator application and by using a switchable inductor to split the VHF band into two sub-bands (the full VHF/UHF and
hyperband) the TV bands can be covered.
Two pins are available between the mixer output and the IF amplifier input to enable IF filtering for improved signal handling. Three PNP
ports are provided for band switching. Band selection is made according to the band switch bits VHFL, VHFH and UHF.
The PLL synthesizer consists of a divide-by-eight prescaler, a 15-bit programmable divider, a 4 MHz crystal oscillator and its programmable
reference divider and a phase comparator combined with a charge pump which drives the tuning amplifier, including 33 V output.
Depending on the reference divider ratio (512, 640 or 1024), the phase comparator operates at 7.8125 kHz, 6.25 kHz or 3.90625 kHz.
The devices are controlled according to the IC-bus format. The in-lock detector bit FL is set to logic 1 when the loop is locked and is read
on the SDA line (status byte) during a read operation. The ADC input is available for digital Automatic Frequency Control (AFC). The ADC
code is read during a read operation on the IC-bus. In test mode, pin ADC is used as a test output for f
REF and 1/2 fDIV.
When the charge pump current switch mode is activated and the loop is phase-locked the charge pump current value is automatically
switched to LOW. This is to improve carrier-to-noise ratio. The status of this feature can be read in the ACPS flag during a read operation
on the IC-bus.
Five serial bytes (including address byte) are required for the IC-bus format to address the devices, select the VCO frequency, program
the three PNP ports, set the charge pump current and to set the reference divider ratio. The devices have four independent IC-bus
addresses which can be selected by applying a specific voltage on the AS input.
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相關(guān)PDF資料
PDF描述
935260938551 SPECIALTY CONSUMER CIRCUIT, PQFP44
935260938557 SPECIALTY CONSUMER CIRCUIT, PQFP44
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935261120518 1-CH 10-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, PDSO28
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