yac526 Yamatake Corporation, yac526 Datasheet - Page 4

• Manufacturer Part Number: yac526
• Description: Electric Variable Resistance
• Manufacturer: Yamatake Corporation

■Description of functions
●Analog functions
●Realization of low residual noise system
4
・Maximum input voltage
・Maximum output voltage
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 YAC526 (Gain=MUTE) is 1.2 Vrms (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 1 V, the conventional configuration produces noise of
approximately 200
small.
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.
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 100
Volume
Residual noise produced by
conventional configuration
1μVrms
μ
V at the speakers. For the configuration that uses YAC526, the noise is 38 V which is very
+16dB
PreAMP
6.3μVrms
MainAMP
+30dB
％
200μVrms
μ
μ
Zin=10k
Residual noise produced by a
configuration that adopts YAC526
Ω
Volume + PreAMP
-∞〜+16dB
YAC526
YAC526
1.2μVrms
μ
MainAMP
+30dB
Ω
38μVrms
(typ.).