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YAC520 Schematic ( PDF Datasheet ) - YAMAHA CORPORATION

Teilenummer YAC520
Beschreibung High Grade Volume Control
Hersteller YAMAHA CORPORATION
Logo YAMAHA CORPORATION Logo 




Gesamt 16 Seiten
YAC520 Datasheet, Funktion
YAC520
HGVC1
High Grade Volume Control
s Outline
YAC520(HGVC1) is a high grade stereophonic digital volume for high end audio system.
www.DataShIsetteeptp4rsoUvw.icdiotehms w0.i5dedBdypnearmsitcerpa.nTgheeanudseloowf
distortion as
16 bit serial
well,
data
and can control individual channels in 256
interface allows daisy chain connection of
several devices for multi channel system.
Zero Crossing Detection function suppresses audible noise at quick change of the volume.
YAC520 operates on a single 5 volt power supply, and it is possible to input signal of up to 7.9Vrms by
using three types of connection methods.
Development evaluation board, DMB-HGVC1, equipped with PC interface is available.
s Features
q Wide volume range
(can be used in three ways)
q Adjustment step
q Gain Error
q Low distortion factor
q Low residual noise
A: +32.0 to 95.0dB IN1=IN2
(Input < 2.0Vrms @VDD=5V)
B: +29.5 to 97.5dB IN2=GND (Input < 2.6Vrms @VDD=5V)
C: +20.0 to 107.0dB IN1=GND (Input < 7.9Vrms @VDD=5V)
adjustable in 256 steps, with 0.5dB per step
± 0.1dB
0.001% (input=150 mVrms, gain=+16dB)
1 µVrms (gain=- )
s Others
Process
Package
Power supply voltage
Operating temperature
Power consumption
CMOS process
20 SSOP (YAC520-E)
5V
0 to +70 ºC
100 mW @VDD=5.0 V
YAC520 CATALOG
CATALOG No.: LSI-4AC520A4
2001.12






YAC520 Datasheet, Funktion
s Realization of system with low residual noise
YAC520
Configuration that uses HGVC1
HGVC1
+
16dB to -
1µ
Vrms
+30dB
30µ
Vrms
Conventional configuration
0
Vrms
+
-
+16dB
1µ
Vrms
+30dB
30µ
Vrms
Volume+PreAMP
MainAMP
Volume
PreAMP
MainAMP
General audio amplifiers are designed with the input sensitivity of approximately 150mV, and has gain
www.DataSofhaepeptr4oUx.icmoamtely 16 dB at PreAMP section, and approximately 30 dB at Power AMP section.
For passive volume, they are given configuration of “Volume””PreAMP””MainAMP” as shown in the
above right figure. System with very small residual noise can be made by giving HGVC1 also the
function of “PreAMP” because HGVC1 has the positive side gain (max : 32 dB).
Since the residual noise of HGVC1 (gain=- ) is 1 µVrms(typ.), the noise level at the speaker end becomes
30 µVrms if the noise of MainAMP is neglected. On the other hand, when conventional configuration is
used, the noise at the speaker end becomes very large because the noise produced by the initial stage of
PreAMP is amplified approximately by 46 dB (200 times) even if the level of noise produced by the
volume section during mute is zero.
To achieve the noise level at the speaker end that is equivalent to the one obtained with configuration
using HGVC1, the level of the noise converted to that of input of PreAMP is required to be approximately
0.16 µVrms (-136 dBV), which is very difficult to achieve.
As described above, HGVC1 provides advantage of making the residual noise very small because it has
built-in amplifiers.
6

6 Page









YAC520 pdf, datenblatt
s Example of System Configuration (2)
YAC520
www.DataSheet4U.com
MUTE -
RELAY
DRIVER
MUTE
DRIVER
BassOut:Main
Center:None
Front:None
MICRO
CONTROLLER
6ch INPUT
INPUT
REC OUT
12

12 Page





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