UAA1008A‑DP PLL Tuning Processor IC DIP‑24
The UAA1008A‑DP is a monolithic silicon integrated circuit engineered by Motorola as the analog interface core for digital television tuning memory systems. Far more than a simple support chip, it bridges the digital control section—using companion ICs such as the MC14425, MC14429, or MC14426—and the analog front-end of a TV set. The device integrates a precise digital‑to‑analog converter for varicap tuning voltage generation, dual‑rail regulated power supplies (a high‑voltage 34V varicap rail and a low‑noise 5V VDD supply for external CMOS logic), and a bank of three high‑current band‑switch drivers capable of sourcing up to 35mA each. Station capture logic processes negative‑going video modulation, positive flyback pulses, and a video carrier discriminator AFC signal, automatically gating the tuning window and verifying station presence. The UAA1008A‑DP thus replaces discrete tuning‑interface circuitry with a single, reliable 24‑pin DIP package, making it essential for restoring classic TV chassis or studying late‑20th‑century electronic tuning architectures.
Features:
- Integrated digital‑to‑analog converter generates a precise varicap tuning voltage, eliminating complex discrete DAC circuits.
- On‑chip 34V regulated supply for varicap diodes and a separate 5V regulated output for external logic (up to 10mA), ensuring stable operation.
- Three dedicated band‑switch output drivers (VHF I, VHF III, UHF) with 35mA continuous current capability for direct tuner control.
- Automatic station capture logic uses video, flyback, and AFC signals to enable reliable search‑and‑lock without external processors.
Specifications:
| Parameter | Value |
|---|---|
| Supply Voltage (Pin 24) | 12–18VDC |
| Supply Current (@VCC=18V, band drivers off) | 21mA |
| Stabilized 5V Output (Pin 22) | 4.95–5.45VDC (IDD=10mA max) |
| Varicap Voltage Output (Pin 6) | 33–40.5VDC (IV=2mA) |
| Continuous Band‑Switch Output Current | 35mA |
| AFC Input Sensitivity (Pin 11) | ±200mV typical (referenced to VDD) |
| Time Base Output (Pin 20) | 4VDC (HIGH, IOH=20μA) / 1VDC (LOW, IOL=500μA) |
| UP/DOWN Output Levels | 4VDC (HIGH) / 1VDC (LOW) |
| Supply OK Output | 4VDC (HIGH, 500μA) / 1VDC (LOW, 10μA) |
| Operating Temperature Range | 0°C to 70°C |
| Package | 24‑Pin Plastic DIP |
Configuration:
Applications:
- Analog television chassis with electronic tuning (e.g., Thorn TX9, TX10).
- FM tuner systems with automatic station search.
- Vintage hi‑fi receivers requiring PLL frequency synthesis.
- Restoration and repair of 1980s consumer electronics.
- Educational projects on PLL and analog tuning circuits.
Package Include:
1x UAA1008A‑DP PLL Tuning Processor IC DIP‑24