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74HC/HCT4046A

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General description

The 74HC/HCT4046A are high-speed Si-gate CMOS devices and are pin compatible with the '4046' of the '4000B' series. They are specified in compliance with JEDEC standard no. 7A.

The 74HC/HCT4046A are phase-locked-loop circuits that comprise a linear voltage-controlled oscillator (VCO) and three different phase comparators (PC1, PC2 and PC3) with a common signal input amplifier and a common comparator input.

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. With a passive low-pass filter, the '4046A' forms a second-order loop PLL. The excellent VCO linearity is achieved by the use of linear op-amp techniques.

The VCO requires one external capacitor C1 (between C1A and C1B) and one external resistor R1 (between R1 and GND) or two external resistors R1 and R2 (between R1 and GND, and R2 and GND). Resistor R1 and capacitor C1 determine the frequency range of the VCO. Resistor R2 enables the VCO to have a frequency offset if required.

The high input impedance of the VCO simplifies the design of low-pass filters by giving the designer a wide choice of resistor/capacitor ranges. In order not to load the low-pass filter, a demodulator output of the VCO input voltage is provided at pin 10 (DEMOUT). In contrast to conventional techniques where the DEMOUT voltage is one threshold voltage lower than the VCO input voltage, here the DEMOUT voltage equals that of the VCO input. If DEMOUT is used, a load resistor (RS) should be connected from DEMOUT to GND; if unused, DEMOUT should be left open. The VCO output (VCOOUT) can be connected directly to the comparator input (COMPIN), or connected via a frequency-divider. The VCO output signal has a duty factor of 50% (maximum expected deviation 1%), if the VCO input is held at a constant DC level. A LOW level at the inhibit input (INH) enables the VCO and demodulator, while a HIGH level turns both off to minimize standby power consumption.

The only difference between the HC and HCT versions is the input level specification of the INH input. This input disables the VCO section. The sections of the comparator are identical, so that there is no difference in the SIGIN (pin 14) or COMPIN (pin 3) inputs between the HC and HCT versions.

Features

  • Low power consumption
  • Centre frequency of up to 17 MHz (typ.) at VCC = 4.5 V
  • Choice of three phase comparators: EXCLUSIVE-OR;
  • edge-triggered JK flip-flop;
  • edge-triggered RS flip-flop
  • Excellent VCO frequency linearity
  • VCO-inhibit control for ON/OFF keying and for low standby power consumption
  • Minimal frequency drift
  • Operating 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

Products/packages

Type numberNorth American Type numberOrdering code (12NC)Product statusPackagePackingMarkingChemical contentLeadfree conversion date
74HC4046AD74HC4046AD9338 095 50652Volume productionSOT109-1
(SO16)
Bulk Pack, CECCStandard Marking74HC4046AD
week 6, 2004
74HC4046AD74HC4046AD-T9338 095 50653Volume productionSOT109-1
(SO16)
Reel Pack, SMD, 13", CECCStandard Marking74HC4046AD
week 6, 2004
74HC4046ADB74HC4046ADB9351 874 50112Volume productionSOT338-1
(SSOP16)
TubeStandard Marking74HC4046ADB
week 12, 2005
74HC4046ADB74HC4046ADB-T9351 874 50118Volume productionSOT338-1
(SSOP16)
Reel Pack, SMD, 13"Standard Marking74HC4046ADB
week 12, 2005
74HC4046AN74HC4046AN9338 095 40652Volume productionSOT38-4
(DIP16)
Bulk Pack, CECCStandard Marking74HC4046AN
Always Pb-free
74HC4046APW74HC4046APW9351 874 60112Volume productionSOT403-1
(TSSOP16)
TubeStandard Marking74HC4046APW
week 10, 2005
74HC4046APW74HC4046APW-T9351 874 60118Volume productionSOT403-1
(TSSOP16)
Reel Pack, SMD, 13"Standard Marking74HC4046APW
week 10, 2005
74HCT4046AD74HCT4046AD9338 095 70112Volume productionSOT109-1
(SO16)
Bulk PackStandard Marking74HCT4046AD
week 6, 2004
74HCT4046AD74HCT4046AD-T9338 095 70118Volume productionSOT109-1
(SO16)
Reel Pack, SMD, 13"Standard Marking74HCT4046AD
week 6, 2004
74HCT4046ADB74HCT4046ADB9351 749 40112Volume productionSOT338-1
(SSOP16)
TubeStandard Marking74HCT4046ADB
week 13, 2005
74HCT4046ADB74HCT4046ADB-T9351 749 40118Volume productionSOT338-1
(SSOP16)
Reel Pack, SMD, 13"Standard Marking74HCT4046ADB
week 13, 2005
74HCT4046AN74HCT4046AN9338 095 60112Volume productionSOT38-4
(DIP16)
Bulk PackStandard Marking74HCT4046AN
Always Pb-free

Pricing/ordering/availability

Type numberOrdering code(12NC)Indicative price/unit($)RegionDistributorIn stockInventory dateBuy onlineSamples
74HC4046AD9338 095  50652  0.5200     not available
74HC4046AD9338 095  50653  0.5200      Order samples
74HC4046ADB9351 874  50112  0.5400     not available
74HC4046ADB9351 874  50118  0.5400      Order samples
74HC4046AN9338 095  40652  0.5200      Order samples
74HC4046APW9351 874  60112  0.5200     not available
74HC4046APW9351 874  60118  0.5200      Order samples
74HCT4046AD9338 095  70112  0.5200      Order samples
74HCT4046AD9338 095  70118  0.5200      Order samples
74HCT4046ADB9351 749  40112  0.7800     not available
74HCT4046ADB9351 749  40118  0.7800      Order samples
74HCT4046AN9338 095  60112  0.5200      Order samples

Applications

  • Electronic tuning in UHF television tuners
  • Voltage controlled oscillators (VCO).

Block diagrams/pinning

Technical documents

Support Documents

HCT_USER_GUIDE; HC/T User Guide (1997-11-01)

Parametrics/similar products

Type numberPackageDescriptionFmax(MHz)Propagation Delay(ns)VoltageNo. of PinsPower Dissipation ConsiderationsLogic Switching LevelsOutput Drive Capability
74HC4046ADSOT109-1
(SO16)
Phase-Locked-Loop with VCO 21 18@5V 3.0-6.0 V 16 Low Power or Battery Applications CMOS +/- 5.2 mA
74HC4046ADBSOT338-1
(SSOP16)
Phase-Locked-Loop with VCO 21 18@5V 3.0-6.0 V 16 Low Power or Battery Applications CMOS +/- 5.2 mA
74HC4046ANSOT38-4
(DIP16)
Phase-Locked-Loop with VCO 21 18@5V 3.0-6.0 V 16 Low Power or Battery Applications CMOS +/- 5.2 mA
74HC4046APWSOT403-1
(TSSOP16)
Phase-Locked-Loop with VCO 21 18@5V 3.0-6.0 V 16 Low Power or Battery Applications CMOS +/- 5.2 mA
74HCT4046ADSOT109-1
(SO16)
Phase-Locked-Loop with VCO; TTL Enabled 19 23 4.5-5.5 V Low Power TTL +/- 4 mA
74HCT4046ADBSOT338-1
(SSOP16)
Phase-Locked-Loop with VCO; TTL Enabled 19 23 4.5-5.5 V Low Power TTL +/- 4 mA
74HCT4046ANSOT38-4
(DIP16)
Phase-Locked-Loop with VCO; TTL Enabled 19 23 4.5-5.5 V Low Power TTL +/- 4 mA

Similar products

74HC/HCT4046A links to the similar products page containing an overview of products that are similar in function or related to the type number(s) as listed on this page. The similar products page includes products from the same catalog tree(s), relevant selection guides and products from the same functional category.

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