YAMAHA YSS906-N Datasheet

YSS906

ASR2P

Analog Surround

YAMAHA CORPORATION

YSS906CATALOG

CATALOG No.:LSI-4SS906A2

1998. 6

INTRODUCTION

YSS906 is an LSI for processing signals that uses Yamaha’s original wide surround technology,

“YMERSION™”, and the tone control/loudness circuit that is built-in the device.

This LSI has the following features.

1. In addition to normal stereophonic input signal processing function, this LSI uses the pseudo­stereophonic sound processing function to give listeners a feeling of extended sound field.

2. Offers the wide surround effect by using “YMERSION™” technology.

3. Use of tone control/loudness function can emphasize specific tones.

When reproducing music in compact audio appliances such as the arcade game or other game applications,
YSS906 is particularly suited to meeting the need of adding a feeling of extended sound field or emphasizing
specific bass or treble tones. This LSI does not require use of the microcomputer, A/D and D/A functions and
memories because it uses analog signals without converting them to digital signal.

FEATURES

Wide Surround : Surround function through the use of amplitude/phase conversion circuit
Tone control : Bass (100 Hz +/- 10 dB), Treble (10 kHz +/- 10 dB) (recommended )
Loudness : -30dB (recommended)

Note: Either the tone control or loudness can be selected.

Other features : Stereophonic/Monaural enabling/disabling switch

Wide surround enabling/disabling switch
Wide control of wide surround
Tone control enabling/disabling switch
Bass/Treble tone control

Every control is made through the voltage at pins.
Operating voltage: Wide operating voltage from 3.0 to 5.5 V
Package : 20SKDIP (YSS906-N)

Process : Silicon gate CMOS process

YMERSION™ is Yamaha's registered trade mark.

YSS906

- 2 -

PIN CONFIGURATION

20 SKDIP

(YSS906-N)

1

10

11

20

WL
FOL
FCL

WR

FOR
FCR

SC2
SC1

AIL

AIR

SW

AVDD

AVSS

VREF

AOR

TBR

TAR

AOL

TBL

TAL

PIN FUNCTION

Pin No. I/O Pin name Function

1 I WL 3D Lch Wide Input
2 O FOL 3D Lch Filter Output
3 O FCL 3D Lch Capacitor
4 I WR 3D Rch Wide Input
5 O FOR 3D Rch Filter Output
6 O FCR 3D Rch Capacitor
7 O SC2 Pseudo Stereo Filter Capacitor 2
8 O SC1 Pseudo Stereo Filter Capacitor 1

9 I AIL Lch Input
10 I AIR Rch Input
11 I SW Pseudo Stereo, 3D and Tone Control ON/OFF Input
12 AVDD Power Supply
13 AVSS Ground
14 O VREF Voltage Reference
15 O AOR Rch Output
16 I TBR Rch Tone Control(B)
17 O TAR Rch Tone Control(A)
18 O AOL Lch Output
19 I TBL Lch Tone Control(B)
20 O TAL Lch Tone Control(A)

YSS906

- 3 -

DESCRIPTION OF PIN FUNCTION

Pin name (Pin No.) Function

1. WL (1) Left channel Wide Surround input
WR (4) Right channel Wide Surround input

The Wide Surround effect is obtained by inputting the signal from FOL(No.2) and FOR(No.5)
to WL and WR respectively after adjusting their output levels.

2. FOL (2) Left channel filter output Refer to the above section.
FOR (5) Right channel filter output

3. FCL (3) Left channel filter capacitor connection
FCR (6) Right channel filter capacitor connection

A capacitor of 0.018 mF is to be connected between each of FCL to Ground and FCR to
Ground.

4. SC2 (7) pseudo-stereophonic filter capacitor connection
SC1 (8) pseudo-stereophonic filter capacitor connection

A capacitor of 0.047 mF is to be connected between SC1 and Ground.
A capacitor of 0.0082 mF is to be connected between SC2 and Ground.

5. AIL(9) Left channel analog signal input
AIR(10) Right channel analog signal input

Left channel signal is to be inputted to AIL through a capacitor of 10 mF.
Right channel signal is to be inputted to AIR through a capacitor of 10 mF.

6. SW(11) Stereophonic/monaural selection, Wide Surround and Tone Control

A lead of the three resistors, 50 kW, 100 kW and 200 kW, is to be connected to this pin, and the
other end of the parts is connected to either AVDD or AVSS to ON/OFF the function.
When 50 kW, 100 kW and/or 200 kW resistor is connected to AVDD, stereophonic / monaural
selection, Wide Surround and/or Tone Control is enabled respectively, or when connected to
AVSS, these functions are disabled accordingly.

7. AVDD(12) Power supply

This pin applies voltage between +3.0 V and +5.5 V DC inclusive with respect to the potential
of AVSS. A capacitor of 10 mF is to be connected between this pin and AVSS(13).

8. AVSS(13) Ground Provides a reference for AVDD and analog signal.

9. VREF(14) Operating voltage

Outputs a voltage that is equal to the difference between the potentials at AVDD and AVSS
divided by 2, or (AVDD - AVSS)/2, that is used as a reference voltage for the internal circuit of
this LSI. A capacitor of 10 mF is to be connected between this pin and AVSS(13).

10. AOR(15) Right channel analog signal output
AOL(18) Left channel analog signal output

A capacitor is to be connected to AOR and AOL pins before outputting analog signals.

11. TBR(16) and TAR(17) Right channel tone control input
TBL(19) and TAL(20) Left channel tone control input

Right channel tone control circuit is formed by connecting AOR(15), TBR(16) and TA
R(17) pins through a circuit that includes capacitors and resistors.
Left channel tone control circuit is formed by connecting AOL(18), TBL(19) and TAL(20) pins
through a circuit that includes capacitors and resistors.

(Refer to the example of application presented in the next page.)

YSS906

- 4 -

BLOCK DIAGRAM

Flow diagram

APF

APF

Pseudo-Stereo

LPF

LPF

YMERSION

Tone

Control

Tone

Control

AIL

AIR

AOL

AOR

fb

fb

-1

-1

-1

Function diagram

ON/
OFF

WIDE

ON/
OFF

AIL

AIR

AOL

AOR

ON/
OFF

WIDE

ON/
OFF

LOUDNESS

ON/
OFF

AIL

AIR

AOL

AOR

ON/
OFF

BASS

TREBLE

Pseudo-stereo+Wide surround+Tone control

Pseudo-stereo+Wide surround+Loudness

Pseudo

stereo

Pseudo

stereo

Wide

surround

Wide

surround

Tone

control

Loudness

EXAMPLE OF APPLICATION

This section presents an example of application of YSS906 that makes Wide Surround and tone controls through
variable resistors.

200

IN R

IN L

50

100

OUTR

OUTL

100

43

20

50

43

100

43

20

50

10

0. 047

VDD (+5V)

GND (0 V)

0. 022

100

6800pF

2200pF 2200pF

43

A recommended application of YSS906 (ASR2P)

10

10

10

10

0. 0082

0. 018

0. 018

GND

10

10

0. 022

470

10

470

k

k
k

k

k

kB

F

kB

k

k

k k

kB

F

F

6800pF

kB

kB

F

F

F

F

F

F

F

F

kB

F

F

GND

GND

GND

GND GND

GND

YSS906 can be made different characteristics with external components at various values.