74HC4046A

The 74HC4046A is high-speed Si-gate CMOS device and is pin compatible with the "4046" of the "4000B"series.It is specified in compliance with JEDEC stanard no.7A.It is phase-locked-loop circuits that comprise a linear voltage-controlled oscillator(VCO)and three different phase comparators with a common signal input amplifier anda common comparator input.The signal input can be directly coulped 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 amplifers. With a passive low-pass filter, the "4046A" forms a second-order loop PLL.

Features of of the 74HC4046A are:(1)low power consumption; (2)centre frequency of up to 17 MHz typ at Vcc is 4.5 V; (3)choice of three phase comparators; (4)excellent VCO frequency linearity; (5)VCO-inhibit control for ON/OFF keying and for low standby power consumption; (6)minimal frequency drift; (7)operating power supply voltage range: VCO section 3.0 V to 6.0 V; digital section 2.0 V to 6.0 V; (8)zero voltage offset due to op-amp buffering; (9)output capability:standard.

The absolute maximum ratings of the 74HC4046A can be summarized as:(1): DC supply voltage(Vcc) is -0.5 V min and +7 V max; (2): DC input diode current(±1IK) is 20 mA max( for VI<-0.5 V or VI>Vcc+0.5V); (3): DC output diode current(±1OK) is 20 mA max( for VI<-0.5 V or VI>Vcc+0.5V); (4): DC output source or sink current(±1O) is 25 mA max( for Vo<-0.5 V or Vo>Vcc+0.5V); (5): storage temperature range(Tstg) is -65 to +150.