TS4994FC datasheet(28/35 Pages) STMICROELECTRONICS

28 / 35 page

Application information

TS4994FC

28/35

Figure 96 and Figure 97 show CMRR versus frequency for a typical application with a

random selection of four

ΔR/R values with a 0.1% tolerance.

4.7

Power dissipation and efficiency

Assumptions:

●

Load voltage and current are sinusoidal (Vout and Iout)

●

Supply voltage is a pure DC source (VCC)

The output voltage is:

and

Figure 94.

CMRR vs. frequency (worst case

conditions)

Figure 95.

CMRR vs. frequency (worst case

conditions)

100

1000

10000

-60

-50

-40

-30

-20

-10

Cb=1

μF

Cb=0

20k

Vcc = 5V

Vic = 200mVpp

Av = 1, Cin = 470

μF

ΔR/R = 0.1%, RL ≥ 8Ω

Tamb = 25

°C

Frequency (Hz)

100

1000

10000

-60

-50

-40

-30

-20

-10

Cb=1

μF

Cb=0

20k

Vcc = 2.5V

Vic = 200mVpp

Av = 1, Cin = 470

μF

ΔR/R = 0.1%, RL ≥ 8Ω

Tamb = 25

°C

Frequency (Hz)

Figure 96.

CMRR vs. frequency with random

selection condition

Figure 97.

CMRR vs. frequency with random

selection condition

100

1000

10000

-90

-80

-70

-60

-50

-40

-30

-20

-10

Cb=1

μF

Cb=0

20k

Vcc = 5V

Vic = 200mVpp

Av = 1, Cin = 470

μF

ΔR/R ≤ 0.1%, RL ≥ 8Ω

Tamb = 25

°C

Frequency (Hz)

100

1000

10000

-90

-80

-70

-60

-50

-40

-30

-20

-10

Cb=1

μF

Cb=0

20k

Vcc = 2.5V

Vic = 200mVpp

Av = 1, Cin = 470

μF

ΔR/R ≤ 0.1%, RL ≥ 8Ω

Tamb = 25

°C

Frequency (Hz)

out = Vpeak sinωt (V)

out =

out

------------- (A)

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