Phase Lock Loop (PLL) IC 21MHz 1 16-SSOP (0.209", 5.30mm Width)
GENERAL DESCRIPTION The 74HC/HCT7046 are high-speed Si-gate CMOS devices and are specified in compliance with JEDEC standard no. 7. FEATURES • Low power consumption • Centre frequency up to 17 MHz (typ.) at VCC= 4.5 V • Choice of two phase comparators: EXCLUSIVE-OR; edge-triggered JK flip-flop; • Excellent VCO frequency linearity • VCO-inhibit control for ON/OFF keying and for low standby power consumption • Minimal frequency drift • Operation power supply voltage range: VCO section 3.0 to 6.0 V digital section 2.0 to 6.0 V • Zero voltage offset due to op-amp buffering • Output capability: standard • ICC category: MSI
The CD74HC7046AM is a Phase-locked Loop with VCO and lock detector. High-speed silicon-gate CMOS device, specified in compliance with JEDEC Standard No. 7A, are phase-locked-loop (PLL) circuits that contain a linear voltage-controlled oscillator (VCO), two-phase comparators (PC1, PC2) and a lock detector. A signal input and a comparator input are common to each comparator. The lock detector gives a HIGH level at pin 1 (LD) when the PLL is locked. The lock detector capacitor must be connected between pin 15 (CLD) and pin 8 (Gnd). For a frequency range of 100kHz to 10MHz, the lock detector capacitor should be 1000 to 10pF respectively. The signal input can be directly coupled to large voltage signals or indirectly coupled (with a series capacitor) to small voltage signals. A self-bias input circuit keeps small voltage signals within the linear region of the input amplifiers.