NTE825 datasheet(2/3 Pages) NTE | Integrated Circuit Battery Operated Audio Amp

2 page

Electrical Characteristics: (TA = 25°C unless otherwise specified)

Parameter

Symbol

Test Conditions

Min

Typ

Max

Unit

Operating Supply Voltage

–

Quiescent Current

VS = 6V, RL = 4Ω, THD = 10%, Note 2

–

Output Power

POUT

VS = 6V, RL = 4Ω, THD = 10%, Note 2

0.8

1.0

–

Voltage Gain

VS = 6V, f = 1kHz 10µF from Pin2 to Pin6

Bandwidth

VS = 6V, Pin2 and Pin6 Open

–

kHz

Total Harmonic Distortion

THD

VS = 6V, RL = 4Ω, POUT = 500mW,

f = 1kHz, Pin2 and Pin6 Open

–

0.2

Power Supply Rejection

Ratio

PSRR

VS = 6V, f = 1kHz, CBYPASS = 10µF,

Pin2 and Pin6 Open, Referred to Output,

Note 3

–

Input Resistance

RIN

–

Ω

Input Bias Current

IBIAS

VS = 6V, Pins 7 and 8 Open

–

250

–

Note 2. If oscillation exists under some load conditions, add a 2.7

Ω and 0.05µF series network from

Pin13 to GND.

Note 3. If load and bypass capacitor are returned to VS rather than GND, PSRR is typically 30dB.

Application Hints:

Gain Control

To make the NTE825 a more versatile amplifier, two pins (Pin2 and Pin6) are provided for gain

control. With Pin2 and Pin6 open, the gain is 20 (26dB). If a capacitor is put from Pin2 to Pin6,

the gain will go up to 200 (46dB). If a resistor is placed in series with the capacitor, the gain

can be set to any value from 20 to 200. A 10

µf Electrolytic with positive to Pin6 is a usual value.

Additional external components can be placed in parallel with the internal feedback resistors

to tailor the gain and frequency response for inidividual applications. For example, a series

RC from Pin6 to Pin13 (paralleling the internal 15k

Ω resistor) yields 6dB effective bass boost

if R

≅ 15kΩ and Pin2 is open. If Pin2 and Pin6 are bypassed, then R as low as 2kΩ can be

used. This restriction is because the amplifier is only compensated for closed–loop gains

greater than 9V/V.

Input Biasing

When using NTE825 with higher gains (bypassing the internal 1.35k

Ω resistor between Pin2

and Pin6) it is necessary to bypass the unused input, preventing degradation of gain and pos-

sible instabilities. This is done with a 0.1

µF capacitor or a short to GND depending on the DC

source resistance on the driven input.

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