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MC44BC374T1

Features: • No external varicaps diodes/inductor or tuned components• Channel 21-69 UHF operation• VHF range possible by internal dividers (30MHz450MHz)• Integrated on-chip programmable UHF oscillator• Extremely low external components count• HighspeedI2 C-bus c...

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SeekIC No. : 004416018 Detail

MC44BC374T1: Features: • No external varicaps diodes/inductor or tuned components• Channel 21-69 UHF operation• VHF range possible by internal dividers (30MHz450MHz)• Integrated on-chip p...

MC44BC374T1 Data Sheet

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Part Number:
MC44BC374T1
Supply Ability:
5000

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  • 1~5000
  • Unit Price
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  • Processing time
  • 15 Days
Total Cost: $ 0.00

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Product Details

Description



Features:

• No external varicaps diodes/inductor or tuned components
• Channel 21-69 UHF operation
• VHF range possible by internal dividers (30MHz450MHz)
• Integrated on-chip programmable UHF oscillator
• Extremely low external components count
• HighspeedI2 C-bus compatible (800kHz)
• Fixed video modulation depth (80%)
• Peak White Clip disabled via the bus
• Programmable picture/sound carrier ratio (12dB and 16dB)
• Integrated on-chip programmable sound subcarrier oscillator (4.5MHz to 6.5MHz)-No external varicaps
• On-chip video test pattern generator with sound test signal (1kHz)
• Low-power modulator standby mode programmable by I2C bus or switchable by STBY pin voltage
• Transient output inhibit during PLL Lock-up at power-ON
• Start-up on channel '71' (871.25 MHz)
• Extremely robust ESD protection, minimum 4kV, typical 6kV


Pinout

Connection Diagram


Specifications

Sym
Parameter
Value
Unit
Vcc
 Supply voltage
6
V
Tamin
 Minimum operating ambient temperature
20
Tamax
 Maximum operating ambient temperature
85
Tstgmin
 Minimum storage temperature
65
Tstgmax
 Maximum storage temperature
150
Tj
 Junction Temperature
150
Maximum ratings are those values beyond which damage to the device may occur. For functional
operation, values should be restricted to the Recommended Operating Condition. Meets Moisture
Sensitivity Level 1, no dry pack required

This device contains protection circuitry to guard against damage due to high static voltage or electric
fields. However, precautions must be taken to avoid applications of any voltage higher thanmaximum
rated voltages to this high impedance circuit. For proper operation, input and output voltages should
be constrained to the ranges indicated in the Recommended Operating Conditions.


Description

The channel MC44BC374T1 is set by an on-chip high-speed I2C compatible bus receiver. A Phase-Locked Loop (PLL) tunes the modulator over the full UHF range. The MC44BC374T1 incorporates a sound subcarrier oscillator and uses a second PLL to derive 4.5, 5.5, 6.0, and 6.5MHz subcarrier frequencies. These frequencies are selectable using the bus.

The MC44BC374T1 standard is set to System B/G.

The picture-to-sound ratio is adjusted using the bus. In addition, an on-chip video test pattern generator can be turned ON with a 1KHz audio test signal.

Compared with the MC44BC374C, this modulator has one IIC programming difference, a hardware standby mode in addition to the software standby mode, and no logic output port.

Compared with the MC44BC374T, this modulator has a different start-up channel.




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