LPV531 datasheet(14/27 Pages) TI

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REXT = 1 M:

LOW

POWER

MODE

REXT = 100 k:

MID

POWER

MODE

REXT = 0:

HIGH

POWER

MODE

VOUT

LPV531

ISEL

VINT = 110 mV

RINT = 11 k:

6 V

2 V

OUT

ISEL

REXT

LPV531

SNOSAK5B – MARCH 2006 – REVISED MARCH 2013

www.ti.com

Figure 36. Single Power Mode

Switched Discrete Power Modes

In this typical application, the LPV531 can operate at two (or more) power modes in order to fulfill the demands

of the design. One of the modes is used to save power. It is a low power mode which is set by using a large

resistor. The others are the higher power modes which are set by one or more smaller resistors. The larger

resistor that sets the low power mode can be permanently connected while the smaller resistor(s) can be

switched in parallel to set the high power mode(s). This configuration allows the designer to get the required

performance from the LPV531 when needed.

Figure 37. Power Modes Set by Resistors and Switches

The switches shown in Figure 37 can be easily implemented with an open drain I/O port of an ASIC or any other

simple pull down switch.

DAC Controlled Power Modes

For voltage controlled filter applications, where control of the gain bandwidth is essential, a DAC and a resistive

voltage divider can be used. In this application the current drawn from the ISEL pin is controlled by the DAC. The

DAC’s total output range is divided to match the V− to VINT voltage which has the range of 0-110 mV.

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