NJU72014RB2 View Datasheet(PDF) - Japan Radio Corporation
Part Name
Description
Manufacturer
NJU72014RB2 Datasheet PDF : 10 Pages
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NJU72014
1.1.4 To reducing output signal level
Output Gain level(Gv) is adjustable by the value of the R1 and R2 connected to Input pin (Pin 1,10).
Add ATT to input pin of NJU72014 as shown in Fig.4.
Gv
=
11.25
+
20
log
R1
R2 // (R3 +
+ R2 // (R3
R4 )
+ R4
)
+
20
log
R3
R4
+ R4
(1)
NJUNJ7U270210412
C1
RR11=1k
IN
R3=18k
OUT
R2
R4=200k
Fig.4 NJU72014 with ATT.
Ex) In the case of R1=1kΩ and R2=82kΩ
Gv
=
11.25
+
20
log
R1
R2 // (R3 +
+ R2 // (R3
R4 )
+ R4
)
+
20
log
R3
R4
+ R4
=
11.25
+
20
log
1k
82k // (18k +
+ 82k // (18k
200k )
+ 200k
)
+
20
log
200k
18k + 200k
= 10.36 [dB]
1.2 Control of V+ terminal and Mute terminal
1.2.2 Power-on procedure
Turn on the V+ in the condition of MUTE terminal is “Low”. After 100msec from power on, change the
control voltage of MUTE terminal (Vcnt) from "Low" to "High".
* It is necessary to stabilize an IC for 100msec.
1.2.3 Power-off procedure
Change the control voltage of MUTE terminal (Vcnt) from "High" to "Low".By the MUTE function, the
output signals are stopped from output terminal.
Turn off the V+.
V+
(3pin)
MUTE
(7pin)
100msec
t
100msec
t
MUTE ON
MUTE OFF
MUTE ON
Fig.5 Power-on / Power-off timing chart
–6–
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