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Datasheet: YAC523-VZ (YAMAHA Corp.)

High-quality 7-channel Digital Volume

 

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YAMAHA Corp.
YAC523
EVR2
Electric Variable Resistance 2
Outline
YAC523 (EVR2) is a 7ch high grade digital volume LSI for high-end audio systems.
Owing to its built-in high-quality sound operational amplifier, output with wide dynamic range and low distortion
factor can be obtained.
YAC523 is able to control each channel through a serial data interface in 255 steps at 0.5dB per step, and can
allow configuration of a system with 8 channels or more by using a daisy chain connection.
Owing to its zero-cross detection function, the device is able to suppress audible noise that may occur at a quick
volume change.
YAC523CATALOG
CATALOG No.:LSI-4AC523A2
2003.5
Built-in 7channel high sound quality operational amplifier.
Wide volume range.
31.5dB-95.0dB, MUTE (0.5dB/step, 255 steps)
Maximum input signal amplitude
4.2Vrms (6V power supply)
Low distortion (THD)
0.0004 typ. (Input=1Vrms@1kHz, Gain=0dB
Low residual noise
1.2Vrms typ. (Gain=MUTE, IHF-A)
Power supply voltage
4.75V6.6V
Silicon gate CMOS process.
48-pin plastic LQFP (YAC523-VZ)
Features
YAC523
Terminal configration
YAC523-VZ
2
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
AVSS
ZCEN1
ZCEN2
CSN
SDATAI
SCLK
SDATAO
TE2
DGND
REF
AVSS
REF1A
REF2B
REF2A
REF3B
REF3A
REF4B
REF4A
REF5A
REF5B
REF6A
REF6B
REF7A
AVSS
AVDD
IN1
IN2
IN3
IN4
IN5
IN6
IN7
AVDD
AVSS
REF7B
N
C
N
C
OUT1
OUT2
OUT3
OUT4
OUT6
OUT7
N
C
N
C
OUT5
REF1B
<48 pin LQFP TopView>
TE1
YAC523
3
Terminal function
AVSS
AVDD
IN1
IN2
IN3
IN4
IN5
IN6
IN7
AVSS
REF7B
No.
Name
I/O
Function
REF1A
REF2B
REF2A
REF3B
REF3A
REF4B
REF4A
REF5A
REF5B
REF6A
REF6B
REF7A
NC
NC
OUT1
OUT2
OUT3
OUT4
OUT6
OUT7
NC
NC
OUT5
REF1B
AVSS
ZCEN1
ZCEN2
CSN
SDATAI
SCLK
SDATAO
TE2
DGND
REF
AVSS
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
46
47
48
-
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AO
AO
AO
AO
AO
I
I
I
I
I
OD
I
O
Minus power supply for analog (-6.0V Typ.)
Plus power supply for analog (+6.0V Typ.)
ch1 analog input
ch2 analog input
ch3 analog input
ch4 analog input
ch5 analog input
ch6 analog input
ch7 analog input
ch7 analog reference voltage input 7B Connect to ground directly.
Non connection or connect to ground.
ch5 analog output
ch1 analog output
Non connection or connect to ground.
ch4 analog output
Minus power supply for analog (-6.0V Typ.)
ch7 analog output
ch6 analog output
ch3 analog output
ch2 analog output
Non connection or connect to ground.
Non connection or connect to ground.
Minus power supply for analog (-6.0V Typ.)
Zero-cross control input 1. Select one from four types of zero-cross modes including non-zero-
Chip select input
Serial data input
Serial clock input
Test terminal Non connection or connect to DGND terminal.
Digital ground
-
-
-
-
Note A: analog terminal, OD: Open drain output terminal, "L" level means V
IL
, "H" level means V
IH
.
AVDD
-
-
Plus power supply for analog (+6.0V Typ.)
Minus power supply for analog (-6.0V Typ.)
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ch7 analog reference voltage input 7A
Connect to ground through 33 F.
ch6 analog reference voltage input 6B Connect to ground directly.
ch6 analog reference voltage input 6A
Connect to ground through 33 F.
ch5 analog reference voltage input 5B Connect to ground directly.
ch5 analog reference voltage input 5A
Connect to ground through 33 F.
ch4 analog reference voltage input 4A
Connect to ground through 33 F.
ch4 analog reference voltage input 4B Connect to ground directly.
ch3 analog reference voltage input 3A
Connect to ground through 33 F.
ch3 analog reference voltage input 3B Connect to ground directly.
ch2 analog reference voltage input 2A
Connect to ground through 33 F.
ch2 analog reference voltage input 2B Connect to ground directly.
ch1 analog reference voltage input 1A
Connect to ground through 33 F.
ch1 analog reference voltage input 1B Connect to ground directly.
-
AO
AO
-
-
TE1
45
I Test terminal Non connection or connect to DGND terminal.
-
changes at 1 second or more after the rise of CSN signal.
cross mode. When changing zero-cross modes during operation, set the system so that it
Zero-cross control input 2. Select one from four types of zero-cross modes including non-zero-
changes at 1 second or more after the rise of CSN signal.
cross mode. When changing zero-cross modes during operation, set the system so that it
Serial data output
Serial data are outputted from this terminal when CSN pin is "L" level. This terminal becomes
high-impedance state when CSN pin is "H". Since it is an open drain output pin, pull it up
connected. Do not allow output current of 1.5mA or over.
through a resistor to the power supply voltage (to be AVDD or less) of a device to be
Reference voltage output for digital For attaining stabilization, connect this terminal to
AVSS terminal through a capacitance of 10F or higher (C
REF
).
When avoid the use of this terminal, connect to ground.
And please use the output impedance of the source of input
signal less than 2.2k .
And please do not use this terminal output for the drive purpose of an external circuit.
YAC523
4
Internal block diagram
IN1
REF1A
0-95dB
0+31.5dB
Vol A: 15k
OPAmp
IN2
REF2A
0-95dB
0+31.5dB
OPAmp
IN3
REF3A
0-95dB
0+31.5dB
OPAmp
IN4
REF4A
0-95dB
0+31.5dB
OPAmp
OPAmp
0-95dB
0+31.5dB
REF5A
IN5
OPAmp
0-95dB
0+31.5dB
REF6A
IN6
OPAmp
0-95dB
0+31.5dB
REF7A
IN7
Zero
Crossing
Detector
Zero
Crossing
Detector
Control
Register
S/P
Register
56
TE1
TE2
ZCEN2
SDATAO(OpenDrain)
SDATAI
SCLK
CSN
AVSS
DGND
REF
AVDD
ZCEN1
REF1B
Vol A: 15k
REF2B
REF3B
REF4B
Vol A: 15k
Vol A: 15k
REF5B
REF6B
REF7B
Vol A: 15k
Vol A: 15k
Vol A: 15k
100
100
100
100
100
100
100
CH1,2,3,4 Control
CH5,6,7 Control
OUT1
OUT2
OUT3
OUT4
OUT5
OUT6
OUT7
Vol B: 50k
Vol B: 50k
Vol B: 50k
Vol B: 50k
Vol B: 50k
Vol B: 50k
Vol B: 50k
YAC523
5
Description of functions
Analog functions
Maximum input voltage
The maximum amplitude of the input signal that is inputted to the analog input pin of YAC523 is 4.2Vrms when
power supply voltage is 6V.
For a system to which a signal exceeding the power supply voltage (AVDD/AVSS) may be applied, use external
diodes to suppress the signal to the maximum rating or less.
Maximum output voltage
The maximum output voltage(THD<1
) of the signal that is outputted from the analog output pin of YAC523 is
4.2Vrms when power supply voltage is 6V and no load is connected. The output impedance is 100
(typ.).
Realization of low residual noise system
General audio amplifiers are designed to have input sensitivity of approximately 150mV, and have a gain of
approximately 16dB at the preamplifier (PreAMP) section and approximately 30dB at the main amplifier section
(MainAMP).
The residual noise of YAC523 (Gain=-) is 1.2 Vrms (typ.) which is very small, and the device has positive side
gain (max: 31.5dB). Therefore, by using YAC523 also as "PreAMP", systems with a very small residual noise
and amplification of volume control noise can be configured.
For conventional configurations that need a "PreAMP", even if the residual noise of the volume control itself is
zero, the noise that is produced at the "PreAMP" is amplified by the gain, the noise becomes very high when it is
heard at the speakers.
When the input converted noise of "PreAMP" is 1 V, the conventional configuration produces noise of
approximately 200
V at the speakers. For the configuration that uses YAC523, the noise is 38 V which is very
small.
1Vrms
6.3Vrms
200Vrms
Volume
PreAMP
MainAMP
+16dB
+30dB
Residual noise produced by
conventional configuration
Residual noise produced by a
configuration that adopts YAC523
YAC523
1.2Vrms
38Vrms
Volume + PreAMP
MainAMP
-+16dB
+30dB
Zin=50k
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