TSH110ILT datasheet(14/19 Pages) STMICROELECTRONICS

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TSH110-TSH111-TSH112-TSH113-TSH114

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Printed Circuit Board Layout Considerations

In this range of frequency, printed circuit board

parasitics can affect the closed-loop performance.

The implementation of a proper ground plane in

both sides of the PCB is mandatory to provide low

inductance and low resistance common return.

Most important for controlling the gain flatness

and the bandwidth are stray capacitances at the

output and inverting input. For minimizing the cou-

pling, the space between signal lines and ground

plane will be increased. Connections of the feed-

back components must be as short as possible on

order to decrease the associated inductance

which affect high frequency gain errors. It is very

important to choose external components as small

as possible such as surface mounted devices,

SMD, in order to minimize the size of all the dc and

ac connections.

Power Supply Bypassing

A proper power supply bypassing comes very im-

portant for optimizing the performance in high fre-

quency range. Bypass capacitors must be placed

as close as possible to the IC pins to improve high

frequency bypassing. A capacitor greater than

µF is necessary to minimize the distortion. For a

better quality bypassing a capacitor of 0.1

µF will

be added following the same condition of imple-

mentation. These bypass capacitors must be in-

corporated for the negative and the positive sup-

plies.

(fig.32): Circuit for power supply bypassing.

Channel Separation or Crosstalk

The following figure show the crosstalk from an

amplifier to a second amplifier. This phenomenon,

accented in high frequencies, is unavoidable and

intrinsic of the circuit.

Nevertheless, the PCB layout has also an effect

on the crosstalk level. Capacitive coupling be-

tween signal wires, distance between critical sig-

nal nodes, power supply bypassing, are the most

significant points.

(fig.33): Crosstalk vs. Frequency.

AV=+2, Rfb=680Ω, Cfb=2pF, RL=100Ω, Vcc=±6V, ±2.5V

Single Power Supply

The TSH11x operates from 12V down to 5V power

supplies. This is achieved with a dual power sup-

ply of ±6V and ±2.5V or a single power supply of

12V and 5V referenced to the ground. In the case

of this asymmetrical supplying, a biasing is neces-

sary to assume a positive output dynamic range

between 0V and +Vcc supply rails. Considering

the values of VOH and VOL, the amplifier will pro-

vide an ouput dynamic from +1.35V to 10.75V for

a 12V supplying, from 0.6V to 4.5V for a 5V sup-

plying.

The following figure show the case of a 5V single

power supply configuration.

(fig.34): Circuit for +5V single supply.

-VCC

0.1

µF

+VCC

µF

0.1

µF

TSH11x

-VCC

0.1

µF

+VCC

µF

0.1

µF

TSH11x

10k

100k

10M

100M

-100

-80

-60

-40

-20

Frequency (Hz)

Ω

680

Ω

+5V

Ω

OUT

Ω

Rfb, 680

Ω

µF

+ 1

µF

Cfb

2pF

TSH11x

100

µF

Ω

+5V

10nF

Rin

Ω

680

Ω

+5V

Ω

OUT

Ω

Rfb, 680

Ω

µF

+ 1

µF

Cfb

2pF

TSH11x

100

µF

Ω

+5V

10nF

Rin

Ω

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