TLV3541IDBVT datasheet(21/45 Pages) TI2

21 / 45 page

5 kW

10-mA max

V+

OUT

OVERLOAD

Device

OUT

2pRC

3 dB

R = R

C = C

Q = Peaking factor

(Butterworth Q = 0.707)

G =

(

2 -

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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 shown in Figure 31. 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 31. Two-Pole, Low-Pass, Sallen-Key Filter

9 Power Supply Recommendations

The TLV354x family is specified from 2.7 V to 5.5 V (±1.35 V to ±2.75 V), although the devices can operate from

2.5 V to 5.5 V (±1.25 V to ±2.75 V); many specifications apply from –40°C to +125°C. Typical Characteristics

presents parameters that can exhibit significant variance with regard to operating voltage or temperature.

CAUTION

Supply voltages larger than 7.5 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 Layout

Guidelines.

9.1 Input and ESD Protection

The TLV354x 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 32 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 32. Input Current Protection

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