LM26LVCISDX-080SLASHNOPB datasheet(19/33 Pages) TI1

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VTEMP

LM26LV

VDD

GND

CLOAD >

1100 pF

OPTIONAL

BYPASS

CAPACITANCE

VTEMP

LM26LV

VDD

GND

OPTIONAL

BYPASS

CAPACITANCE

CLOAD d 1100 pF

LM26LV

www.ti.com

SNIS144F – JULY 2007 – REVISED FEBRUARY 2013

NOISE IMMUNITY

The LM26LV/LM26LV-Q1 is virtually immune from false triggers on the OVERTEMP and OVERTEMP digital

outputs due to noise on the power supply. Test have been conducted showing that, with the die temperature

within 0.5°C of the temperature trip point, and the severe test of a 3 Vpp square wave "noise" signal injected on

the VDD line, over the VDD range of 2V to 5V, there were no false triggers.

TRIP TEST Digital Input

The TRIP TEST pin simply provides a means to test the OVERTEMP and OVERTEMP digital outputs

electronically by causing them to assert, at any operating temperature, as a result of forcing the TRIP TEST pin

high.

When the TRIP TEST pin is pulled high the VTEMP pin will be at the VTRIP voltage.

If not used, the TRIP TEST pin may either be left open or grounded.

VTEMP Analog Temperature Sensor Output

The VTEMP push-pull output provides the ability to sink and source significant current. This is beneficial when, for

example, driving dynamic loads like an input stage on an analog-to-digital converter (ADC). In these applications

the source current is required to quickly charge the input capacitor of the ADC. See the Applications Circuits

section for more discussion of this topic. The LM26LV/LM26LV-Q1 is ideal for this and other applications which

require strong source or sink current.

NOISE CONSIDERATIONS

The LM26LV/LM26LV-Q1's supply-noise rejection (the ratio of the AC signal on VTEMP to the AC signal on VDD)

was measured during bench tests. It's typical attenuation is shown in the Typical Performance Characteristics

section. A load capacitor on the output can help to filter noise.

For operation in very noisy environments, some bypass capacitance should be present on the supply within

approximately 2 inches of the LM26LV/LM26LV-Q1.

CAPACITIVE LOADS

The VTEMP Output handles capacitive loading well. In an extremely noisy environment, or when driving a switched

sampling input on an ADC, it may be necessary to add some filtering to minimize noise coupling. Without any

precautions, the VTEMP can drive a capacitive load less than or equal to 1100 pF as shown in Figure 21. For

capacitive loads greater than 1100 pF, a series resistor is required on the output, as shown in Figure 22, to

maintain stable conditions.

Figure 21. LM26LV/LM26LV-Q1 No Decoupling Required for Capacitive Loads Less than 1100pF.

Figure 22. LM26LV/LM26LV-Q1 with series resistor for capacitive loading greater than 1100pF

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