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YAC526
EVR3
Electric Variable Resistance 3
Outline
YAC526 (EVR3) is a 2ch 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
www.DataSfhaecteotr4cUa.ncobme obtained.
YAC526 is able to control each channel through a serial data interface in 255 steps at 0.5dB per step, and
daisy chain connection can constitute a multichannel system.
Owing to its zero-cross detection function, the device is able to suppress audible noise that may occur at a quick
volume change.
Features
Built-in 2channel high sound quality operational amplifier.
Wide volume range.
31.5dB95.0dB, MUTE (0.5dB/step, 255 steps)
Maximum input signal amplitude
4.2Vrms (±6V power supply)
Low distortion (THD)
0.0002typ. (Input=1Vrms@1kHz, Gain=0dB
Low residual noise
1.2μVrms typ. (Gain=MUTE, IHF-A)
Power supply voltage
±4.75V〜±6.6V
Silicon gate CMOS process.
24-pin plastic SSOP. The plating of pins is lead-free.(YAC526-EZ)
YAC526 CATALOG
CATALOG No.:LSI-4AC526A2
2003.10

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Terminal configration
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ZCEN1
ZCEN2
CSN
SDATAI
DGND
REF
DVSS
SCLK
SDATAO
TE1
TE2
TE3
1
2
3
4
5
6
7
8
9
10
11
12
YAC526
24 IN1
23 REF1A
22 REF1B
21 OUT1
20 AVDD
19 AVSS
18 AVSS
17 AVDD
16 OUT2
15 REF2B
14 REF2A
13 IN2
Terminal function
24 pin SSOP Top View
No. Name
1 ZCEN1
I/O Function
I Zero-cross control input 1. Select one from four types of zero-cross modes including non-zero-
cross mode. When changing zero-cross modes during operation, set the system so that it
changes at 1 second or more after the rise of CSN signal.
2 ZCEN2
I Zero-cross control input 2. Select one from four types of zero-cross modes including non-zero-
cross mode. When changing zero-cross modes during operation, set the system so that it
changes at 1 second or more after the rise of CSN signal.
3 CSN
I Chip select input
4 SDATAI I Serial data input
5 DGND Digital ground
6 REF
O Reference voltage output for digital For attaining stabilization, connect this terminal to
DVSS terminal through a capacitance of 10µF or higher (CREF).
And please do not use this terminal output for the drive purpose of an external circuit.
7 DVSS Minus power supply for digital (-6.0V Typ.)
8 SCLK
I Serial clock input
9 SDATAO OD 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
through a resistor to the power supply voltage (to be AVDD or less) of a device to be
connected. Do not allow output current of 1.5mA or over.
10 TE1
I Test terminal (Pull-down) Non connection or connect to DGND terminal.
11 TE2
I Test terminal (Pull-down) Non connection or connect to DGND terminal.
12 TE3
I Test terminal (Pull-down) Non connection or connect to DGND terminal.
13 IN2
AI ch2 analog input The output impedance of input signal source is used less than 10kΩ.
When avoid the use of this terminal, connect to ground.
14 REF2A AI ch2 analog reference voltage input A Connect to ground directly.
15 REF2B AI ch2 analog reference voltage input B Connect to ground directly.
16 OUT2 AO ch2 analog output
17 AVDD Plus power supply for analog (+6.0V Typ.)
18 AVSS Minus power supply for analog (-6.0V Typ.)
19 AVSS Minus power supply for analog (-6.0V Typ.)
20 AVDD Plus power supply for analog (+6.0V Typ.)
21 OUT1 AO ch1 analog output
22 REF1B AI ch1 analog reference voltage input B Connect to ground directly.
23 REF1A AI ch1 analog reference voltage input A Connect to ground directly.
24 IN1
AI ch1 analog input The output impedance of input signal source is used less than 10kΩ.
When avoid the use of this terminal, connect to ground.
Note A: analog terminal, OD: Open drain output terminal, "L" level means VIL, "H" level means VIH.
2

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YAC526
Block diagram
IN1
REF1B
REF1A
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AVDD
DGND
REF
AVSS
DVSS
REF2A
REF2B
IN2
Vol B: 10kΩ
0〜-95dB
0〜+31.5dB
OPAmp
100Ω
OUT1
Zero
Crossing
Detector
Zero
Crossing
Detector
Vol A: 15kΩ
Control
Register
S/P
16 Register
Vol A: 15kΩ
TE1
TE2
TE3
ZCEN1
ZCEN2
SDATAO(OpenDrain)
SDATAI
SCLK
CSN
Vol B: 10kΩ
0〜+31.5dB
0〜-95dB
OPAmp
100Ω
OUT2
3

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YAC526
Description of functions
Analog functions
Maximum input voltage
The maximum amplitude of the input signal that is inputted to the analog input pin of YAC526 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 YAC526 is
4.2Vrms when power supply voltage is ±6V and no load is connected. The output impedance is 100Ω (typ.).
Realization of low residual noise system
www.DatGaSenheereatl4aUud.cioomamplifiers 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 YAC526 (Gain=MUTE) is 1.2μVrms (typ.) which is very small, and the device has positive
side gain (max: 31.5dB). Therefore, by using YAC526 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 1μV, the conventional configuration produces noise of
approximately 200μV at the speakers. For the configuration that uses YAC526, the noise is 38μV which is very
small.
Residual noise produced by
conventional configuration
1μVrms
6.3μVrms 200μVrms
+16dB
+30dB
Residual noise produced by a
configuration that adopts YAC526
1.2μVrms 38μVrms
YAC526
Zin=10kΩ
+30dB
Volume
PreAMP MainAMP
-∞〜+16dB
Volume + PreAMP
MainAMP
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YAC526
Digital functions
Serial data interface
Writing of volume control data into YAC526 is performed through a serial interface. SDATAI is a serial data input
pin, SCLK is a clock input pin, and CSN is a chip select pin for writing the value of volume. 16-bit serial data that
is inputted from SDATAI (MSB first) is taken into YAC526 at the rising edge of SCLK when CSN terminal is at
"L" level. The serial data is latched at the rising edge of CSN, and volume value of each channel is set into the
register. The present volume value is outputted from SDATAO pin as serial data. With this data, the control by
using daisy chain connection and verification of the present volume value can be performed easily.
Note that the register value after turning the power supply on is ALL"0" (muted state) and the interface is
enabled after a predetermined period (tPUP) has elapsed. (Serial access is prohibited in tPUP period.)
CSN
SCLK
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SDATAO
D1[15] D1[14] D1[13] D1[12] D1[11] D1[10]
D0[15] D0[14] D0[13] D0[12] D0[11] D0[10]
D1[7] D1[6] D1[5] D1[4] D1[3] D1[2] D1[1] D1[0]
D0[7] D0[6] D0[5] D0[4] D0[3] D0[2] D0[1] D0[0] D1[15]
Assignment of volume control data
D[15: 8] : Channel1 Volume data D1[15:0] is volume data value to change.
D[ 7: 0] : Channel2 Volume data D0[15:0] is present volume data value.
Daisy chain
YAC526 is extensible to a multichannel system with daisy chain connection.
For example, by connecting the device with YAC523 (7ch digital volume) through daisy chain, 8.1ch system can
be attained. By connecting SDATAO pin of YAC526 (or YAC523) to SDATAI pin of YAC523 (or YAC526),
YAC526 and YAC523 can be controlled simultaneously without need of a complex addressing.
(It is also possible to connect multiple YAC526.)
The volume data is taken into S/P (serial / parallel) registers of each LSI by setting CSN pin to "L" for 8 clock
period on all channels that are connected with daisy chain. And, by setting CSN pin to "H" after the elapse of 8
clock period on all channels, the data is written from S/P registers of all YAC526 (or YAC523) that are connected
with daisy chain into the control registers simultaneously to change the volume value.
Example: Assignment of volume control data when a combination of YAC526 and YAC523 as described below
is used.
Audio source
2
OUT
27
IN OUT
7
IN
YAC526
5V
YAC523
SDATAO
CSN
SDATAI
SCLK
SDATAO
CSN
SDATAI
SCLK
5V
D[71:64] : [YAC526] Channel1 Volume data
D[63:56] : [YAC526] Channel2 Volume data
D[55:48] : [YAC523] Channel1 Volume data
D[47:40] : [YAC523] Channel2 Volume data
D[39:32] : [YAC523] Channel3 Volume data
D[31:24] : [YAC523] Channel4 Volume data
D[23:16] : [YAC523] Channel5 Volume data
D[15: 8] : [YAC523] Channel6 Volume data
D[ 7: 0] : [YAC523] Channel7 Volume data
Controller
CSN
SCLK
SDATAI
D[71] D[70] D[69] D[68] D[67] D[66]
D[7] D[6] D[5] D[4] D[3] D[2] D[1] D[0]
5