TEA0665T Philips, TEA0665T Datasheet - Page 7

• Manufacturer Part Number: TEA0665T
• Description: Dolby B and C Type Noise Reduction Circuit
• Manufacturer: Philips

Philips Semiconductors
Notes to the characteristics
1. Operation with minimum of 12 dB headroom; system remains functional to 7 V.
2. Attenuation between pins 1 and 3 is 3,5 dB (MPX-filter).
3. System headroom is determined by the line output channel in use.
4. The equation for REC/PB switch input voltage is:
5. The equation for C/B/OFF mode switch input voltage is:
6. TPL is Test Point Level.
May 1992
Dolby B and C type noise reduction circuit
Playback input sensitivity is 45 mV if a switchable MPX-low pass filter is used in playback mode (pins 2 and 3
short-circuited).
For low supply voltages line output 2 (pin 6) will saturate at high signal levels. Headroom for line output 1 (pin 5)
tracks with record output (pin 21).
REC: V
PB: V
OFF: V
B: 0,45 V
B: 0,5 V
C: V
The voltage drop across the external time constant resistor must be taken in to account.
25-27
24-27
25-27
24-27
CC
> 0,75 V
CC
< 0,45 V
(switch in open position),
< 0,38 V
< V
> 0,55 V
25-27
CC
CC
CC
< 0,55 V
CC
V
V
BE
BE
V
V
BE
BE
1 V.
CC
1,5 V.
1 V,
1,5 V,
(external voltage),
Fig.4 REC/PB switch input configuration.
Fig.3 Mode switch input configuration.
7
Product specification
TEA0665T
TEA0665