SL74HC4046

Features:

·  Low Power Consumption Characteristic of CMOS Device
·  Operating Speeds Similary to LS/ALSTTL
·  Wide Operating Voltage Range: 3.0 to 6.0 V
·  Low Input Current: 1.0 mA Maximum (except SIGIN and COMPIN)
·  Low Quiescent Current: 80 mA Maximum (VCO disabled)
·  High Noise Immunity Characteristic of CMOS Devices
·  Diode Protection on all Inputs


Pinout




Specifications

Symbol	Parameter	Value	Unit
VCC	DC Supply Voltage (Referenced to GND)	-0.5 to +7.0	V
VIN	DC Input Voltage (Referenced to GND)	-1.5 to VCC +1.5	V
VOUT	DC Output Voltage (Referenced to GND)	-0.5 to VCC +0.5	V
IIN	DC Input Current, per Pin	±20	mA
IOUT	DC Output Current, per Pin	±25	mA
ICC	DC Supply Current, VCC and GND Pins	±50	mA
PD	Power Dissipation in Still Air, Plastic DIP+ SOIC Package+	750 500	mW
Tstg	Storage Temperature	-65 to +150
TL	Lead Temperature, 1 mm from Case for 10 Seconds (Plastic DIP or SOIC Package)	260

4


Description

The SL74HC4046 device inputs are compatible with standard CMOS outputs; with pullup resistors, they are compatible with LS/ALSTTL outputs.

The SL74HC4046 phase-locked loop contains three phase comparators, a voltage-controlled oscillator (VCO) and unity gain opamp DEMOUT. The SL74HC4046 comparators have two common signal inputs, COMPIN, and SIGIN. Input SIGIN and COMPIN can be used directly coupled to large voltage signals, or indirectly coupled (with a series capacitor to small voltage signals). The self-bias circuit adjusts small voltage signals in the linear region of the amplifier. SL74HC4046 Phase comparator 1 an exclusive OR gate) provides a digital error signal PC1OUT and maintains 90 degrees phase shift at the center frequency between SIGIN and COMPIN signals (both at 50% duty cycle). Phase comparator 2 with leading-edge sensing logic) provides digital error signals PC2OUT and PCPOUT and maintains a 0 degree phase shift between SIGIN and COMPIN signals (duty cycle is immaterial). The linear VCO produces an output signal VCOOUT whose frequency is determined by the voltage of input VCOIN signal and the capacitor and resistors connected to pins C1A, C1B, R1 and R2. The unity gain op-amp output DEMOUT with an external resistor is used where the VCOIN signal is needed but no loading can be tolerated. The inhibit input, when high, disables the VCO and all on-amps to minimize standby power consumption.

SL74HC4046 Applications include FM and FSK modulation and demodulation, frequency synthesis and multiplication, frequency discrimination, tone decoding, data synchronization and conditioning, voltage-to-frequency conversion and motor speed control.