TSH70CD datasheet(20/25 Pages) STMICROELECTRONICS

20 / 25 page

TSH70, 71, 72, 73, 74, 75

20/25

Video Results:

Precautions on asymmetrical supply

operation:

The TSH7X can be used either with a dual or a

single supply. If a single supply is used, the inputs

are biased to the mid-supply voltage (+Vcc/2).

This bias network must be carefully designed, in

order to reject any noise present on the supply rail.

As the bias current is 15uA, you must carefully

choose the resistance R1 not to introduce an off-

set mismatch at the amplifier inputs.

R1=10K

Ω will be convenient. C1, C2, C3 are by-

pass capacitors from perturbation on Vcc as well

as for the input and output signals. We choose

C1=100nF and C2=C3=100uF.

R2, R3 are such that the current through them

must be superior to 100 times the bias current. So,

we take R2=R3=4.7K

Ω.

Cin, as Cout are chosen to filter the DC signal by

the lowpass filters (R1,Cin) and (Rout, Cout). By

taking

R1=10K

Ω, RL=150Ω, and Cin=2uF,

Cout=220uF we provide a cutoff frequency below

10Hz.

Use of the TSH7X in gain=-1 configuration:

Some precautions have to be added, specially for

low power supply application.

A feedback capacitance Cf should be added for

better stability. The table summarizes the impact

of the capacitance Cf on the phase margin of the

circuit.

Parameter

Value

Vcc=+-2.5V

Value

Vcc=+-5V

Unit

Lum NL

0.1

0.3

Lum NL Step 1

100

Lum NL Step 2

100

99.9

Lum NL Step 3

99.9

99.8

Lum NL Step 4

99.9

Lum NL Step 5

99.9

99.7

Diff Gain pos

Diff Gain neg

-0.7

-0.6

Diff Gain pp

0.7

0.6

Diff Gain Step1

-0.5

-0.3

Diff Gain Step2

-0.7

-0.6

Diff Gain Step3

-0.3

-0.5

Diff Gain Step4

-0.1

-0.3

Diff Gain Step5

-0.4

-0.5

Diff Phase pos

0.1

deg

Diff Phase neg

-0.2

-0.4

deg

Diff Phase pp

0.2

0.5

deg

Diff Phase Step1

-0.2

-0.4

deg

Diff Phase Step2

-0.1

-0.4

deg

Diff Phase Step3

-0.1

-0.3

deg

Diff Phase Step4

0.1

deg

Diff Phase Step5

-0.2

-0.1

deg

Vcc+

OUT

Cin

Cout

Vcc+

OUT

Cin

Cout

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