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YAC526

Electric Variable Resistance 3

YAC526
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 factor can be 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
YAC526 CATALOG CATALOG No.:LSI-4AC526A2 2003.10
YAC526
Terminal configration
ZCEN1 ZCEN2 CSN SDATAI DGND REF DVSS SCLK SDATAO TE1 TE2 TE3 1 2 3 4 5 6 7 8 9 10 11 12 24 23 22 21 20 19 18 17 16 15 14 13 IN1 REF1A REF1B OUT1 AVDD AVSS AVSS AVDD OUT2 REF2B REF2A IN2
24 pin SSOP Top View Terminal function
YAC526
Block diagram
0-95dB 0+31.5dB OPAmp
REF1B REF1A
AVDD DGND REF AVSS DVSS
Zero Crossing Detector
Control Register
Zero Crossing Detector 16
S / P Register
TE1 TE2 TE3 ZCEN1 ZCEN2 SDATAO(OpenDrain) SDATAI SCLK CSN
REF2A REF2B
10k 0+31.5dB 0-95dB OPAmp
YAC526
Description of functions
1Vrms 6.3Vrms 200Vrms
Residual noise produced by a configuration that adopts YAC526
1.2Vrms
YAC526
38Vrms
+16dB
Volume
PreAMP
MainAMP
-+16dB Volume + PreAMP MainAMP
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 SDATAI SDATAO
D115 D114 D113 D112 D111 D110 D17 D16 D15 D14 D13 D12 D11 D10
D015 D014 D013 D012 D011 D010
Assignment of volume control data
Channel1
Volume
D115:0
volume
value
change. D
Channel2
Volume
D015:0
present
volume
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 5V YAC526 SDATAO CSN SDATAI SCLK
YAC523 SDATAO CSN SDATAI SCLK
D71:64
YAC526
Channel1
Volume
D63:56
YAC526
Channel2
Volume
data D55:48
YAC523
Channel1
Volume
data D47:40
YAC523
Channel2
Volume
data D39:32
YAC523
Channel3
Volume
data D31:24
YAC523
Channel4
Volume
data D23:16
YAC523
Channel5
Volume
data D15:
YAC523
Channel6
Volume
data D
YAC523
Channel7
Volume
5V Controller
CSN SCLK SDATAI
D71 D70 D69 D68 D67 D66 D7 D6 D5 D4 D3 D2 D1 D0
YAC526
Volume setting The relationship between input code and volume value is as shown in the following table. (As for an input code, the left serves as MSB.) Input code
Gain or attenuate(dB)
MUTE +31.5
The input codes ALL"0" and ALL"1" are set for mute. Zero-cross mode YAC526 incorporates the zero-cross detection function to suppress audible noise when the volume is changed quickly. A mode is selected from the following four modes by setting ZCEN1 and 2 pins. ZCEN2:1 00 01 10 11 Normal Zero-cross mode A Zero-cross mode B Zero-cross mode C Mode Operation Zero-cross is not detected, and the volume value is changed immediately after the rising of CSN. Zero-cross is detected after the rising of CSN, or after tTM1 (20ms) passes, volume value is changed. Zero-cross is detected after the rising of CSN, or after tTM2 (10ms) passes, volume value is changed. When the next data is written within tTM1 (20ms) for zero-cross mode A, the changed is performed at the falling of CSN by using the volume value immediately before.
No zero-cross
CSN SDATAI Volume
value (Zero-cross mode
B) Volume
value (Zero-cross mode
-12dB -9dB -6dB -15dB(Last
value) -3dB 0dB 0dB
-15dB(Last
value)
-12dB
Operation in each zero-cross mode when zero-cross is not detected Be careful not to change the zero-cross mode during the operation of the device, or an erroneous operation may be caused. Perform change of zero-cross mode after the elapse of 1 second or more from the rising of CSN signal. Power on reset YAC526 builds in the power on reset function that resets the volume value when the power is turned on. Since a system that perform the reset by detecting the power supply voltage level, when turning on the power supply again, do it after the power supply voltage AVDD and AVSS has reduced sufficiently (to +1.0V / -1.0V or less). Moreover, although a volume register is reset at the time of a power supply injection, since shocking sound occurs in the case of power supply ON / OFF, please apply mute to the whole set.
YAC526
Electrical
characteristics
Typ. 6.00 -6.00 -6.00
Max. 6.60 -4.75 -4.75 85
Max. +31.5
Unit dB dB dB dB dB k k pF pF Vrms Vrms Vrms Vrms Vrms dB
Unit mW
Symbol VIH VIL VOL ILI
Condition
Min. 2.2 -0.3
Max. AVDD+0.3 0.8 0.4 10
YAC526
tCSPH
VIH VIH
tCSVS SCLK
VIH VIL
tLTH tSDVS
VIH VIL
VIH VIL VIH VIL
SDATAI
tCSDH
SDATAO
MSB tSSD
Fig 1 Serial port timing
YAC526
Example of system configuration
When there is a fear that voltage exceeding the maximum rating is applied to the analog input pins (IN1 and IN2) of YAC526, connect diodes between AVDD and AVSS as shown below to prevent application of voltage exceeding the maximum rating to the input pins. Please make an analog domain and a digital domain into the ground side separated, respectively, and arrange YAC526 to an analog domain and the impedance to an AVSS pin should become small as much as possible. And please secure an area large enough, and a radiation noise should fully be stopped and an analog ground and a digital ground also make it. Control signals, such as serial interface, should wire a digital ground side collectively. In order to prevent interference with a control signal and an analog signal, be careful for an analog signal and a digital signal not to cross or not to adjoin.
Analog input terminal protection AVDD
5V Since SDATAO is an open drain output pin, connect it to the power supply of the destination device connected through a resistor. SDATAI of YAC523 / YAC526 Digital Controller VDD VSS
YAC526
1 2 3 4 5 6 -6V 7 8 9 10 11 12 ZCEN1 ZCEN2 CSN SDATAI DGND REF DVSS SCLK SDATAO TE1 TE2 TE3 IN1 REF1A REF1B OUT1 AVDD AVSS AVSS AVDD OUT2 REF2B REF2A IN2 24 23 22 21 20 19 18 17 16 15 14 13 +6V -6V
Digital ground Analog ground
YAC526
Frequency response
YAC526
THD vs Input voltage 1kHz
Input voltage (Vrms)
THD vs Input voltage 20kHz
Input voltage (Vrms)
YAC526
External dimensions of package
C-PK24EP-1
P-0.65TYP
(UNIT) : mm (millimeters) The figure in the parenthesis ( ) should be used as a reference. Plastic body dimensions do not include burr of resin. UNIT: mm
0 MIN. (STAND OFF)
2.10MAX.
YAC526
Note) The specifications of this product are subject to change without notice. Agency
Semiconductor Sales & Marketing Department
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