-2

-1.5

-1

-0.5

0

0.5

1

1.5

2

0

0.5

1

1.5

2

Time (ms)

VIN

VOUT

TS321

SLOS489C – DECEMBER 2005 – REVISED APRIL 2015

www.ti.com

Typical Application (continued)

9.2.3 Application Curve

Figure 9. Input and output voltages of the inverting amplifier

10 Power Supply Recommendations

The TS321 is specified to operate between 3 V and 30 V or a dual supply between ±1.5 V and ±15 V.

CAUTION

Supply voltages larger than 32 V for a single supply, or outside the range of ±16 V for

a dual supply can permanently damage the device (see the Absolute Maximum

Ratings ).

Place 0.1-

μF bypass capacitors close to the power-supply pins to reduce errors coupling in from noisy or high

impedance power supplies. For more detailed information on bypass capacitor placement, refer to the Layout.

11 Layout

11.1 Layout Guidelines

For best operational performance of the device, use good PCB layout practices, including:

•

Noise can propagate into analog circuitry through the power pins of the circuit as a whole, as well as the

operational amplifier. Bypass capacitors are used to reduce the coupled noise by providing low impedance

power sources local to the analog circuitry.

–

Connect low-ESR, 0.1-

μF ceramic bypass capacitors between each supply pin and ground, placed as

close to the device as possible. A single bypass capacitor from V+ to ground is applicable for single

supply applications.

•

Separate grounding for analog and digital portions of circuitry is one of the simplest and most-effective

methods of noise suppression. One or more layers on multilayer PCBs are usually devoted to ground planes.

A ground plane helps distribute heat and reduces EMI noise pickup. Make sure to physically separate digital

and analog grounds, paying attention to the flow of the ground current. For more detailed information, refer to

application note SLOA089.

•

To reduce parasitic coupling, run the input traces as far away from the supply or output traces as possible. If

it is not possible to keep them separate, it is much better to cross the sensitive trace perpendicular as

10

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