cxa2511aq Sony Electronics, cxa2511aq Datasheet - Page 17

• Manufacturer Part Number: cxa2511aq
• Description: Dolby B-c Type Noise Reduction System With Playback Equalizer Amplifier
• Manufacturer: Sony Electronics

5. Operating mode control method
The CXA2511AQ has a Dolby NR mode select switch (NRMODE), Dolby NR switch (NRSW), playback
equalizer amplifier select switch (TAPESW), head input select switch (DRSW), music sensor mode select
switch (MSMODE) and music sensor switch (MSSW).
The operating modes for each switch are shown in the following table.
Notes on Operation
1. Dolby NR
2. Playback equalizer amplifier
3. Music sensor
Pin No.
Dolby NR functions by using the current that flows into DIREF (Pin 25) as standard.
The Dolby NR attack/recovery time is determined by the capacitance connected to TCH (Pins 8 and 23)
and TCL (Pins 9 and 22).
Use the parts connected to these pins with high accuracy and small temperature characteristics.
(It is recommended that the resistance tolerance of 2% <metal-oxide> and capacitance tolerance of 10%
<film>.)
All playback equalizer amplifier characteristics are determined by the external constants. Use the parts
which satisfies the accuracy required for the playback equalizer amplifier.
The current on DIREF (Pin 25), and the resistance and capacitance connected to G2FB (Pin 10) and G1FB
(Pin 11) determine the detection level and the HPF cut-off frequency.
The response time is determined by the resistance and capacitance connected to MSTC (Pin 12).
Use the parts which satisfies the accuracy required for the music sensor.
15
16
17
18
19
20
21
NRMODE
NRSW
INSW
TAPESW
DRSW
MSMODE
MSSW
Pin name
PBIN FORWARD
– 17 –
Dolby B type NR
Dolby NR OFF
Low (OPEN)
MS ON
120µs
TAPE
G1
Pin voltage
Dolby C type NR
PBIN REVERSE
Dolby NR ON
MS OFF
High
70µs
AUX
G2
CXA2511AQ