|Beschreibung||High Grade Volume Control|
Gesamt 16 Seiten
High Grade Volume Control
YAC520(HGVC1) is a high grade stereophonic digital volume for high end audio system.
16 bit serial
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.
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
0.001% (input=150 mVrms, gain=+16dB)
1 µVrms (gain=- )
Power supply voltage
20 SSOP (YAC520-E)
0 to +70 ºC
100 mW @VDD=5.0 V
CATALOG No.: LSI-4AC520A4
s Realization of system with low residual noise
− Configuration that uses HGVC1 −
16dB to -
− Conventional configuration −
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
s Example of System Configuration (2)
|Seiten||Gesamt 16 Seiten|
|PDF Download||[ YAC520 Schematic.PDF ]|
|YAC520||High Grade Volume Control|
|YAC523||Electric Variable Resistance 2|
|YAC526||Electric Variable Resistance 3|
Hex D-Type Flip-Flop / Quad D-Type Flip-Flop.
EPITAXIAL PLANAR NPN TRANSISTOR.
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