TL054MFKB 查看數據表（PDF） - STMicroelectronics
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TL054MFKB Datasheet PDF : 67 Pages
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TL05x, TL05xA
ENHANCED-JFET LOW-OFFSET
OPERATIONAL AMPLIFIERS
SLOS178A – FEBRUARY 1997 - REVISED FEBRUARY 2003
APPLICATION INFORMATION
phase meter
The phase meter in Figure 84 produces an output voltage of 10 mV per degree of phase delay between the two
input signals VA and VB. The reference signal VA must be the same frequency as VB. The TLC3702 comparators
(U1) convert these two input sine waves into ±5-V square waves. Then, R1 and R4 provide level shifting prior
to the SN74HC109 dual J-K flip flops.
Flip-flop U2B is connected as a toggle flip-flop and generates a square wave at one-half the frequency of VB.
Flip-flop U2A also produces a square wave at one-half the input frequency. The pulse duration of U2A varies
from zero to one-half the period, where zero corresponds to zero phase delay between VA and VB and one-half
the period corresponds to VB lagging VA by 360 degrees.
The output pulse from U2A causes the TLC4066 (U3) switch to charge the TL05x (U4) integrator capacitors C1
and C2. As the phase delay approaches 360 degrees, the output of U4A approximates a square wave, and U2A
has an output of almost 2.5 V. U4B acts as a noninverting amplifier with a gain of 1.44 in order to scale the
0- to 2.5-V integrator output to a 0- to 3.6-V output range.
R8 and R10 provide output gain and zero-level calibration. This circuit operates over a 100-Hz to 10-kHz
frequency range.
+5 V
R2
100 kΩ
VA
R1
U1A
100 kΩ
R3
100 kΩ
R4
100 kΩ
VB
U1B
S
1J U2A
C1
1K
R
S
2J U2B
C1
2K
R
+5 V
C2
0.016 µF
R6
R7
U3
10 kΩ 10 kΩ
NC
R5
10 kΩ
C1
0.016 µF
+
U4A
–
NC
Gain
+
U4B
VO
–
R9
20 kΩ
R8
50 kΩ
+5 V
R10
10 kΩ
Zero
–5 V
NOTE A: U1 = TLC3702; VCC± = ±5 V
U2 = SN74HC109
U3 = TLC4066
U4, U5 = TL05x; VCC± = ±5 V
Figure 84. Phase Meter
• POST OFFICE BOX 655303 DALLAS, TEXAS 75265
41
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