MUSES72320 Datasheet, PDF (11/26 Pages) New Japan Radio – ±18V Operation 2-Channel Electronic Volume

MUSES72320
 NOTES
It is necessary to add RD to 10k for the over-current protection. Without this resistor, the IC may be damaged, depending on
the power procedure.
+15V
V+
No Current
+5V
D_VDD
125kΩ
125kΩ
V-(sub)
D_REF
a) The power[V+] is greater than the power[D_VDD].
0V
V+
Current flow s
+5V
D_VDD
125kΩ
125kΩ
V-(sub)
D_REF
b) The power[V+] is less than the power[D_VDD].
Fig.1 Damaged path of the MUSES72320
The input coupling capacitors(CIN) and the input resistance(RIN=20k) form a high-pass filter with the corner frequency
determined in [fc=1/(2RINCIN)].
The Rbias affects the Volume(Att.) linearity characteristic. When Rbias value is too small, the amount of attenuation increases,
so that the output amplitude becomes small and THD deteriorates by an internal analog switch. On the other hand, when Rbias is
too large, it may be affected at the noise from the outside. Please decide resistance value after it verifies it enough by an actual
application.
Separate for REF terminals for High and Middle voltage(AC) and REF terminals for Low voltage(AC) in the pattern design.
Pin No.
2
4
6
11
13
15
Function
Purpose
Lch Reference Voltage
for Low voltage(AC) signal
Lch Reference Voltage
for Middle voltage(AC) signal
Lch Reference Voltage
for High voltage(AC) signal
Rch Reference Voltage
for High voltage(AC) signal
Rch Reference Voltage
for Middle voltage(AC) signal
Rch Reference Voltage
for Low voltage(AC) signal
Table.1 Purpose of Reference Voltage Terminal
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