NTE825 Просмотр технического описания (PDF) - NTE Electronics

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производитель

NTE825

Integrated Circuit Battery Operated Audio Amp

NTE Electronics 

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

Parameter

Symbol

Test Conditions

Min Typ Max Unit

Operating Supply Voltage

Quiescent Current

Output Power

Voltage Gain

Bandwidth

Total Harmonic Distortion

VS

4–

IQ VS = 6V, RL = 4Ω, THD = 10%, Note 2 – 10

POUT VS = 6V, RL = 4Ω, THD = 10%, Note 2 0.8 1.0

AV VS = 6V, f = 1kHz 10µF from Pin2 to Pin6 23 26

BW VS = 6V, Pin2 and Pin6 Open

– 46

THD VS = 6V, RL = 4Ω, POUT = 500mW,

f = 1kHz, Pin2 and Pin6 Open

– 0.2

9V

20 mA

–W

30 dB

– kHz

1%

Power Supply Rejection PSRR VS = 6V, f = 1kHz, CBYPASS = 10µF,

– 50 – dB

Ratio

Pin2 and Pin6 Open, Referred to Output,

Note 3

Input Resistance

Input Bias Current

RIN

IBIAS

VS = 6V, Pins 7 and 8 Open

10 50 – kΩ

– 250 – mA

Note 2. If oscillation exists under some load conditions, add a 2.7Ω 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 10µf 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 15kΩ 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 1.35kΩ 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 0.1µF capacitor or a short to GND depending on the DC

source resistance on the driven input.

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