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NTE2004

Integrated Circuit Dolby Noise Reduction Circuit

NTE Electronics 

NTE2004

Integrated Circuit

Dolby[ Noise Reduction Circuit

Description:

The NTE2004 is a monolithic audio noise reduction circuit in a 16–Lead DIP type package designed

for use in Dolby B–Type noise reduction systems. This device is used to reduce the level of back-

ground noise introduced during recording and playback of audio signals on magnetic tape and to im-

prove the noise level in FM broadcast reception.

Features:

D Accurate Record Mode Frequency Response

D Excellent Frequency Response Tracking with Temperature and VCC ±0.4dB Typ

D Excellent Back–to–Back Dynamic Response – DC Shift Less Than 20mV Typ

D Improved Stability of all OP Amps

D High Reliability Packaging

Absolute Maximum Ratings:

Supply Voltage, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24V

Operating Temperature Range, Topr . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0° to +70°C

Storage Temperature Range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –65° to +150°C

Lead Temperature (During Soldering, 60sec max), TL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +300°C

Electrical Characteristics: (TA = +25°C, VCC = 12V, f = 20Hz to 20kHz. All levels referenced to

580mVrms(0dB) unless otherwised specified)

Parameter

Test Conditions

Min Typ Max Unit

Supply Voltage Range

Supply Current

Voltage Gain

(Pin5–3)

VCC = 12V

f = 1kHz, Pin6 and Pin2 Connected

8 – 20 V

– 16 24 mA

dB

24.5 26.0 27.5

(Pin3–7)

Total Harmonic Distortion

2nd Harmonic

3rd Harmonic

f = 1kHz, 0dB at Pin3, Noise Reduction Out –0.5 0 +0.5 dB

f = 20Hz to 10kHz, 0dB

f = 20Hz to 10kHz, +10dB

– 0.05 0.2 %

– 0.2 0.5 %

Signal Handling

Signal–to–Noise Ratio

Record Mode

Playback Mode

VCC = 12V, 1% Distortion at 1kHz

Note 1

+12 +15 – dB

64 72 – dB

74 82 – dB

Note 1. All noise levels are measured CCIR/ARM weighted using a 10K source with respect to

Dolby level.

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