GENERAL DESCRIPTION

The 74HCT9046A is a high-speed Si-gate CMOS device. It is specified in compliance with “JEDEC standard no. 7A”.

FEATURES

• Low power consumption

• Centre frequency up to 17 MHz (typ.) at VCC = 5.5 V

• Choice of two phase comparators(1):

– EXCLUSIVE-OR (PC1)

– Edge-triggered JK flip-flop (PC2)

• No dead zone of PC2

• Charge pump output on PC2, whose current is set by an external resistor Rb

• Centre frequency tolerance ±10

• Excellent voltage-controlled-oscillator (VCO) linearity

• Low frequency drift with supply voltage and temperature variations

• On chip bandgap reference

• Glitch free operation of VCO, even at very low frequencies

• Inhibit control for ON/OFF keying and for low standby power consumption

• Operation power supply voltage range 4.5 to 5.5 V

• Zero voltage offset due to op-amp buffering

• Output capability: standard

• ICC category: MSI.

APPLICATIONS

• FM modulation and demodulation where a small centre frequency tolerance is essential

• Frequency synthesis and multiplication where a low jitter is required (e.g. Video picture-in-picture)

• Frequency discrimination

• Tone decoding

• Data synchronization and conditioning

• Voltage-to-frequency conversion

• Motor-speed control.