NTE823 Low Voltage Audio Amplifier PDIP-8

Info als pdf File

Description:

The NTE823 is an audio power amplifier in an 8-Lead DIP type package designed for use in low voltage consumer applications.

Absolute Maximum Ratings:

Supply Voltage, VS		15V
Power Dissipation, PD		660mW
Input Voltage, VI		±0.4V
Operating Junction Temperature, TJ		+150°C
Operating Temperature Range, Topr		0° to +70°C
Storage Temperature Range, Tstg		-65° to +150°C
Lead Temperature (During Soldering, 10sec), TL		+300°C

Electrical Characteristics: (V_S = 6V, T_A = +25°C unless otherwise specified)

Parameter	Symbol	Test Conditions	Min	Typ	Max	Unit
Operating Supply Voltage	VS		4	-	12	V
Quiescent Current	ICC	VIN = 0	-	4	8	mA
Power Output	PO	RL = 8 Ohm	250	325	-	mW
Voltage Gain	AV	f = 1kHz 10µF from Pin1 to Pin8	-	26	-	dB
Bandwidth	BW	Pin1 and Pin8 Open	-	300	-	kHz
Total Harmonic Distortion	THD	RL = 8 Ohm, PO = 125mW, f = 1kHz, Pin1 and Pin8 Open	-	0.2	-	%
Power Supply Rejection Ratio	PSRR	f = 1kHz, CBYPASS = 10µF, Pin1 and Pin8 Open	250	-	-	dB
Output Resistance	ZO		-	50	-	k Ohm
Output Bias Current		Pin2 and Pin3 Open	-	250	-	nA

Application Hints:

Gain Control
To make the NTE823 a more versatile amplifier, two pins (Pin1 and Pin8) are provided for gain control. With Pin1 and Pin8 open the 1.35k Ohm resistor sets the gain at 20 (26dB). If a capacitor is put from Pin1 to Pin8, bypassing the 1.35k Ohm resistor, 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. gain control can also be done by capacitively coupling a resistor (or FET) from Pin1 to GND.

Additional external components can be placed in parallel with the internal feedback resistors to tailor the gain and frequency response for individual applications. For example, we can compensate speaker bass response by frequency shaping the feedback path. This is done with a series RC from Pin1 to Pin5 (paralleling the internal 15k Ohm resistor). For 6dB effective bass boost:   R is equivalent to 15k Ohm, the lowest value for good stable operation is R = 10k Ohm if Pin8 is open. If pin1 and Pin8 are bypassed then R as low as 2k Ohm can be used. This restriction is because the amplifier is only compensated for closed-loop gains greater than 9V / V.

Input Biasing
Pin2 and Pin3 of the NTE823 are biased to GND with a 50k Ohm resistor. The base current of the input transistors is about 250nA, so the inputs are at about 12.5mV when left open. If the DC source resistance driving the NTE823 is higher than 250k Ohm it will contribute very little additional offset (about 2.5mV at the input, 50mV at the output). If the DC source resistance is less than 10k Ohm, then shorting the unused input to GND will keep the offset low (about 2.5mV at the input, 50mV at the output). For DC source resistanceses between thses values we can eliminate offset by putting a resistor from the unused input to GND, equal in value to the DC source resistance. Of course all offset problems are eliminated if the input is capacitely coupled.
When using the NTE823 with higher gains (bypassing the 1.35k Ohm resistor between Pin1 and Pin8) it is necessary to bypass the unused input, preventing degradation of gain and possible 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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