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부품번호 | U74HCT7046 기능 |
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기능 | PHASE LOCKED LOOP | ||
제조업체 | Unisonic Technologies | ||
로고 | |||
UNISONIC TECHNOLOGIES CO., LTD
U74HCT7046
PHASE LOCKED LOOP WITH VCO &
LOCK DETECTOR
CMOS IC
DESCRIPTION
The U74HCT7046 is phase-locked-loop circuit that comprise a linear
voltage-controlled oscillator (VCO), two-phase comparators (PC1, PC2),
a lock detector, a common signal input amplifier and a common
comparator input.
The lock detector capacitor should be connected between pin
15(CLD) and pin 8(GND).For a frequency range of 100kHz to 10MHz,the
lock detector capacitor must be 1000pF to 10pF,respectively.
The signal can be directly coupled to large voltage signals, or with a
series capacitor coupled to small signals. Small voltage signals can be
kept within the linear region of the input amplifiers with a self-bias input
circuit. The U74HCT7046 and a passive low-pass filter form a
second-order loop PLL. With a linear op-amp, the VCO achieves
excellent linearity.
The VCO requires external capacitor and resistor. R1 (between R1
and GND) and capacitor C1 (between C1A and C1B) determine the
frequency range of the VCO. R2 (between R2 and GND) enables the
VCO to have a frequency offset if required.
For the high input impedance of the VCO, the design of low-pass filters is simplified, and the designer has a wide
choice of resistor/capacitor ranges. At pin 10 (DEMOUT), a demodulator output of the VCO input voltage is provided
in order not to load the low-pass filter. In conventional techniques, the DEMOUT voltage is one threshold voltage
lower than the VCO input voltage, but the DEMOUT voltage of U74HCT7046 equals the VCO input voltage. When
DEMOUT is used, a load resistor (RS) should be connected from DEMOUT to GND; but if unused, DEMOUT should be
left open. The VCO output (VCOOUT) can be connected directly or via a frequency-divider to the comparator input
(COMPIN). If the VCO input is held at a constant DC level, the VCO output signal has a duty factor of 50%
(maximum expected deviation 1%). 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.
FEATURES
* Operating Power Supply Voltage Range: Digital Section 4.5 to 5.5 V
VCO Section 4.5 to 5.5 V
* Up to 18 MHz (typ.) Centre Frequency at VCC = 5V
* Excellent VCO Frequency Linearity
* VCO-Inhibit Control For ON/OFF Keying and for Low Standby Power Consumption
* Minimal Frequency Drift
* Zero Voltage Offset due to OP-Amp Buffering
www.unisonic.com.tw
Copyright © 2012 Unisonic Technologies Co., Ltd
1 of 16
QW-R502-851.A
U74HCT7046
LOGIC SYMBOL
IEC SYMBOL
CMOS IC
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
4 of 16
QW-R502-851.A
4페이지 U74HCT7046
CMOS IC
DC CHARACTERISTICS (Cont.)
VCO Section (Voltages are Referenced to GND, Ground=0V)
PARAMETER
SYMBOL
TEST CONDITIONS
MIN TYP MAX UNIT
HIGH Level Input Voltage INH
VIH VCC=4.5V~5.5V
2 1.6
V
LOW Level Input Voltage INH
VIL VCC=4.5V~5.5V
1.2 0.8 V
HIGH Level Output Voltage VCOOUT
HIGH Level Output Voltage VCOOUT
VOH
VI=VIH or VIL
VCC=4.5V, -IOUT = 20μA
VOH
VCC=4.5V, -IOUT = 4.0 Ma
VI=VIH or VIL
4.4 4.5
3.9 4.3
V
V
LOW Level Output Voltage VCOOUT
VOL
VI=VIH or VIL
VCC=4.5V, IOUT = 20μA
0 0.1 V
LOW Level Output Voltage VCOOUT
LOW Level Output Voltage C1A, C1B
VOL
VI=VIH or VIL
VCC=4.5V, IOUT = 4.0 mA
VOL
VI=VIH or VIL
VCC=4.5V, IOUT = 4.0 mA
0.1
5
0.26
0.4
V
V
Input Leakage Current(INH, VCOIN)
±IIN VCC=5.5V, VI=GND to VCC
±0.1 μA
Resistance Range
Capacitor Range
R1 / R2
C1
VCC=4.5V (Note1)
VCC=4.5V (no limit Max.)
3.0 300 kΩ
40 pF
Operating Voltage Range at VCOIN
VCC=4.5V, Over the range
VVCOIN specified for R1; for linearity 1.1 3.4 V
(Fig10)
Note: 1. The parallel value of R1 and R2 should be more than 2.7 kΩ. Optimum performance is achieved when
R1 and/ or R2 are/is>10 kΩ.
Demodulator Section (Voltages are Referenced to GND (Ground=0V))
PARAMETER
SYMBOL
TEST CONDITIONS
Resistor Range
VCC=4.5V, At RS>300kΩ
RS the leakage current can influence
VDEMOUT
Offset Voltage VCOIN to VDEMOUT
Dynamic Output Resistance at DEMOUT
VOFF
RD
VCC=4.5V, VI = VVCOIN =1/2 VCC,
values taken over RS range
VCC=4.5V, VDEMOUT = 1/2 VCC
MIN TYP MAX UNIT
50 300 kΩ
±20 mV
25 Ω
AC CHARACTERISTICS (TA =25°C , unless otherwise specified)
Phase Comparator Section (GND=0V, tR=tF=6ns, CL=50pF)
PARAMETER
SYMBOL
TEST CONDITIONS
Propagation Delay SIGIN,
COMPIN to PC1OUT
Output Transition time
tPHL/ tPLH
tTHL/ tTLH
VCC=4.5V (Fig.8)
VCC=4.5V (Fig.8)
3-State Output Enable Time
SIGIN, COMPIN to PC2OUT
tPZH/ tPZL VCC=4.5V (Fig.9)
3-State Output Disable Time
SIGIN, COMPIN to PC2OUT
AC Coupled Input Sensitivity
(Peak-To-Peak Value) at SIGIN or COMPIN
tPHZ/ tPLZ VCC=4.5V (Fig.9)
VIN(P-P) VCC=4.5V (fi = 1MHz)
MIN TYP MAX UNIT
21 40 ns
7 15 ns
27 56 ns
35 65 ns
15 mV
VCO Section (GND=0V, tR=tF=6ns, CL=50pF)
PARAMETER
SYMBOL
Frequency Stability with
Temperature Change
Δf/T
VCO Centre Frequency
(duty Factor = 50%)
fo
VCO Frequency Linearity
Duty factor at VCOOUT
ΔfVCO
δVCO
TEST CONDITIONS
VCC=4.5V, VIN=VVCOIN=1/2 VCC,
R1=100 KΩ; R2=∞; C1=100pF
VCC=4.5V, VVCOIN = 1/2 VCC,
R1=3KΩ, R2 =∞, C1=40pF
VCC=4.5V, R1=100kΩ,
R2=∞,C1=100pF (Fig.10)
VCC=4.5V
MIN TYP MAX UNIT
0.15 %/K
11 17
MHz
0.4 %
50 %
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
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QW-R502-851.A
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부품번호 | 상세설명 및 기능 | 제조사 |
U74HCT7046 | PHASE LOCKED LOOP | Unisonic Technologies |
DataSheet.kr | 2020 | 연락처 | 링크모음 | 검색 | 사이트맵 |