NJU8758 datasheet(4/8 Pages) NJRC

4 / 8 page

NJU8758

- 4 -

Ver.2009-11-10

(4) EQ for Active filter (IN, EQ1, EQ2)

The NJU8758 has EQ1 and EQ2, which is for active filter.

The band-pass filter is calculated as shown below.

Example: The band-pass filter

()

⎟⎟

⎠

⎞

⎜⎜

⎝

⎛

−

CF1>100 pF

(5) Low Voltage Detector

When the power supply voltage drops down to below VDD(MIN), the internal circuit is halted, and the output

terminals(OUTP and OUTN) become in high impedance.

(6) Short Protection Circuit

The short protector is enabled in response to following accidents.

Short between OUTP and OUTN

Short between OUTP and VSS

Short between OUTN and VSS

When the Short Protector enable, the output terminals (OUTP and OUTN) become in high impedance, and

OUTTEST enable” H”(H=VDD). By setting the STBYb terminal to “L”, the NJU8758 returns to normal operation.

Note 1) The detectable current and the period for the protection depend on the power supply voltage and

ambient temperature.

Note 2) The short protector is not effective for a long term short-circuit but for an instantaneous accident.

Continuous high-current may cause permanent damage to NJU8758.

VIN

EQ1

EQ2

RS1

RF1

CS1

CF1

CF2

NJU8758

RS=27 kΩ

RF=32 kΩ

NJU8758 Datasheet(PDF) 4 Page - New Japan Radio