5 kW

10-mA max

V+

V

IN

V

OUT

I

OVERLOAD

Device

R

G

R

F

R

2

R

1

C

2

V

IN

V

OUT

1

2pRC

f

=

-

3 dB

C

1

R

R = R

C

C = C

Q = Peaking factor

(Butterworth Q = 0.707)

1

1

2

2

=

=

R

G =

(

(

R

F

2 -

1

Q

18

TLV314, TLV2314, TLV4314

SBOS754A – MARCH 2016 – REVISED MARCH 2016

www.ti.com

Product Folder Links: TLV314 TLV2314 TLV4314

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Copyright © 2016, Texas Instruments Incorporated

System Examples (continued)

If even more attenuation is needed, a multiple pole filter is required. The Sallen-Key filter can be used for this

task, as Figure 18 shows. For best results, the amplifier must have a bandwidth that is eight to ten times the filter

frequency bandwidth. Failure to follow this guideline can result in phase shift of the amplifier.

Figure 18. Two-Pole, Low-Pass, Sallen-Key Filter

10 Power Supply Recommendations

The TLV314 family is specified for operation from 1.8 V to 5.5 V (±0.9 V to ±2.75 V); many specifications apply

from –40°C to +125°C. The Typical Characteristics section presents parameters that can exhibit significant

variance with regard to operating voltage or temperature.

CAUTION

Supply voltages larger than 7 V can permanently damage the device (see the Absolute

Maximum Ratings table).

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; see the Layout

Guidelines section.

10.1 Input and ESD Protection

The TLV314 family incorporates internal electrostatic discharge (ESD) protection circuits on all pins. In the case

of input and output pins, this protection primarily consists of current-steering diodes connected between the input

and power-supply pins. These ESD protection diodes also provide in-circuit, input overdrive protection, as long

as the current is limited to 10 mA as stated in the Absolute Maximum Ratings table. Figure 19 shows how a

series input resistor can be added to the driven input to limit the input current. The added resistor contributes

thermal noise at the amplifier input, which must be kept to a minimum in noise-sensitive applications.

Figure 19. Input Current Protection