© Semiconductor Components Industries, LLC, 2005
June, 2005 − Rev. 8
1 Publication Order Number:
MC74HC4046A/D
MC74HC4046A
Phase−Locked Loop
High−Performance Silicon−Gate CMOS
The MC74HC4046A is similar in function to the MC14046 Metal
gate CMOS device. The device inputs are compatible with standard
CMOS outputs; with pullup resistors, they are compatible with
LSTTL outputs.
The HC4046A phase−locked loop contains three phase
comparators, a voltage−controlled oscillator (VCO) and unity gain
op−amp DEM
OUT
. The comparators have two common signal inputs,
COMP
IN
, and SIG
IN
. Input SIG
IN
and COMP
IN
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. Phase comparator
1 (an exclusive OR gate) provides a digital error signal PC1
OUT
and
maintains 90 degrees phase shift at the center frequency between
SIG
IN
and COMP
IN
signals (both at 50% duty cycle). Phase
comparator 2 (with leading−edge sensing logic) provides digital error
signals PC2
OUT
and PCP
OUT
and maintains a 0 degree phase shift
between SIG
IN
and COMP
IN
signals (duty cycle is immaterial). The
linear VCO produces an output signal VCO
OUT
whose frequency is
determined by the voltage of input VCO
IN
signal and the capacitor
and resistors connected to pins C1A, C1B, R1 and R2. The unity gain
op−amp output DEM
OUT
with an external resistor is used where the
VCO
IN
signal is needed but no loading can be tolerated. The inhibit
input, when high, disables the VCO and all op−amps to minimize
standby power consumption.
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.
Features
• Output Drive Capability: 10 LSTTL Loads
• Low Power Consumption Characteristic of CMOS Devices
• Operating Speeds Similar to LSTTL
• Wide Operating Voltage Range: 3.0 to 6.0 V
• Low Input Current: 1.0 mA Maximum (except SIG
IN
and COMP
IN
)
• In Compliance with the Requirements Defined by JEDEC Standard
No. 7A
• Low Quiescent Current: 80 mA Maximum (VCO disabled)
• High Noise Immunity Characteristic of CMOS Devices
• Diode Protection on all Inputs
• Chip Complexity: 279 FETs or 70 Equivalent Gates
• Pb−Free Packages are Available*
*For additional information on our Pb−Free strategy and soldering details, please
download the ON Semiconductor Soldering and Mounting Techniques
Reference Manual, SOLDERRM/D.
http://onsemi.com
MARKING
DIAGRAMS
SOIC−16
D SUFFIX
CASE 751B
TSSOP−16
DT SUFFIX
CASE 948F
1
16
PDIP−16
N SUFFIX
CASE 648
1
16
1
16
1
16
MC74HC4046AN
AWLYYWWG
1
16
HC4046AG
AWLYWW
HC40
46A
ALYWG
G
1
16
A = Assembly Location
L, WL = Wafer Lot
Y, YY = Year
W, WW = Work Week
G = Pb−Free Package
G = Pb−Free Package
(Note: Microdot may be in either location)
See detailed ordering and shipping information in the package
dimensions section on page 5 of this data sheet.
ORDERING INFORMATION
1
16
74HC4046A
ALYWG
SOEIAJ−16
F SUFFIX
CASE 966
1
16