PLL
74HCT9046A
PLL with band gap controlled VCO
Rev. 7 — 29 February 2016
Product data sheet
1. General description
The 74...
Description
74HCT9046A
PLL with band gap controlled VCO
Rev. 7 — 29 February 2016
Product data sheet
1. General description
The 74HCT9046A. This device features reduced input threshold levels to allow interfacing to TTL logic levels. Inputs also include clamp diodes, this enables the use of current limiting resistors to interface inputs to voltages in excess of VCC.
2. Features and benefits
Operation power supply voltage range from 4.5 V to 5.5 V Low power consumption Complies with JEDEC standard no. 7A Inhibit control for ON/OFF keying and for low standby power consumption center frequency up to 17 MHz (typical) at VCC = 5.5 V Choice of two phase comparators:
PC1: EXCLUSIVE-OR PC2: Edge-triggered JK flip-flop No dead zone of PC2 Charge pump output on PC2, whose current is set by an external resistor Rbias center frequency tolerance 10 % Excellent Voltage Controlled Oscillator (VCO) linearity Low frequency drift with supply voltage and temperature variations On-chip band gap reference Glitch free operation of VCO, even at very low frequencies Zero voltage offset due to operational amplifier buffering ESD protection: HBM JESD22-A114F exceeds 2000 V MM JESD22-A115-A exceeds 200 V
NXP Semiconductors
74HCT9046A
PLL with band gap controlled VCO
3. Applications
FM modulation and demodulation where a small center frequency tolerance is essential
Frequency synthesis and multiplication where a low jitter is required (e.g. video picture-in-picture)
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