NXP Semiconductors TEA0678T
The TEA0678 is a bipolar integrated circuit that provides two channels of Dolby B noise reduction for playback applications in car radios. It includes head and equalization amplifiers with electronically switchable time constants. This device also detects pauses of music in Automatic Music Search (AMS) mode, with a delay time fixed externally by a resistor.| Part No. | TEA0678T |
|---|---|
| Datasheet | TEA0678T Download |
| Manufacturer |  NXP Semiconductors |
| Description | Dual Dolby* B-type noise reduction circuit/ automatic music search/ with differential outputs and mute |
| Buy | Stock & Price |
FEATURES
● Dual noise reduction (NR) channels● Head pre-amplifiers
● Reverse head switching
● Automatic Music Search (AMS)
● Mute position
● Equalization with electronically switched time constants
● Dolby reference level = 387.5 mV
● 32 pins
● Switch inputs TTL compatible
● Differential output stage has: – Capability to drive 1.2 nF capacitive load – Capability to drive 1 kΩ load – Short-circuit proof – Short-circuit proof to 16 V via coupling capacitor.
● Improved EMC behaviour.
GENERAL DESCRIPTION
TEA0678 Furthermore it includes electronically switchable inputs for tape drivers with reverse heads. The short-circuit proof output stage of the TEA0678 is differential and provides muting. The device will operate with power supplies in the range of 7.6 to 12 V, output overload level increasing with increase in supply voltage. Current drain varies with supply voltage, noise reduction on/off and AMS on/off so it is advisable to use a regulated power supply or a supply with a long time constant. .Current drain varies with these variables: Supply voltage Noise reduction on/off AMS on/off.
