UAA1008A‑DP Tuning System Linear Processor IC DIP‑24

Description

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 Datasheet: UAA1008A

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