TL05 datasheet(56/65 Pages) TI

56 / 65 page

TL05x, TL05xA, TL05xY

ENHANCED-JFET LOW-OFFSET

OPERATIONAL AMPLIFIERS

SLOS178 – FEBRUARY 1997

POST OFFICE BOX 655303

• DALLAS, TEXAS 75265

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 half the frequency of VB.

Flip-flop U2A also produces a square wave at half the input frequency. The pulse duration of U2A varies from

zero to half the period, where zero corresponds to zero phase delay between VA and VB and 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

100 k

Ω

100 k

Ω

U1A

U2A

U2B

U1B

10 k

Ω

10 k

Ω

+ 5 V

100 k

Ω

100 k

Ω

10 k

Ω

0.016

µF

0.016

µF

U4A

U4B

20 k

Ω

Gain

50 k

Ω

+ 5 V

R10

10 k

Ω

Zero

– 5 V

NOTE A: U1 = TLC3702; VCC

± = ±5 V

U2 = SN74HC109

U3 = TLC4066

U4, U5 = TL05x; VCC

± = ±5 V

Figure 84. Phase Meter

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