SA572DTBR2 ON Semiconductor, SA572DTBR2 Datasheet - Page 6

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SA572DTBR2

Manufacturer Part Number
SA572DTBR2
Description
IC COMPANDOR 2CHAN GAIN 16-TSSOP
Manufacturer
ON Semiconductor
Type
Compandorr
Datasheet

Specifications of SA572DTBR2

Applications
Automatic Level Control, Stereo Expander
Mounting Type
Surface Mount
Package / Case
16-TSSOP
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
SA572DTBR2G
Quantity:
2 490
Buffer Amplifier
and slow recovery time for a tone burst input. The fast
attack time reduces transient channel overload but also
causes low-frequency ripple distortion. The low-frequency
ripple distortion can be improved with the slow recovery
time. If different attack times are implemented in
corresponding frequency spectrums in a split band audio
system, high quality performance can be achieved. The
buffer amplifier is designed to make this feature available
with minimum external components. Referring to
Figure 5, the rectifier output current is mirrored into the
input and output of the unipolar buffer amplifier A
Q
accuracy and provide common-mode bias for A
positive-going input signal, the buffer amplifier acts like a
voltage-follower. Therefore, the output impedance of A
makes the contribution of capacitor C
insignificant. Neglecting diode impedance, the gain Ga(t)
for DG can be expressed as follows:
8
In audio systems, it is desirable to have fast attack time
, Q
9
and Q
10
. Diodes D
Q
17
11
and D
Q
I
R
8
+
C
V IN
Q
R
12
A
9
improve tracking
R
10kW
Figure 5. Buffer Amplifier Schematic
to attack time
D
Q
11
10
3
IR
3
through
1
. For a
V+
http://onsemi.com
D
+
12
TRACKING
3
A3
TRIM
6
Ga(t) + (Ga
Ga
Ga
t
where t
internal resistor. Diode D
for a negative-going signal if the value of capacitor C
larger than capacitor C
on C
the dynamic gain G
where t
internal resistor. The gain control current is mirrored to the
gain cell through Q
bias current of A
tracking trim pin into A
A
= R
INT
FNL
D
R
15
A
= Initial Gain
• R
= Final Gain
C
• C
R
A
R
G
G
R
is the recovery time constant and R
is the attack time constant and R
R
R
A
. If the diode impedance is assumed negligible,
(t) + (G
(t) + (G
= 10 k
INT
t
10kW
IR
R
D
2
* Ga
= R
13
2
Q
14
W
14
R
R
and A
. The low level gain errors due to input
I
RINT
RINT
Q
• C
• C
(t) for DG is expressed as follows:
= 2IR
A
3
FNL
. The recovery time depends only
R
A
with a current source of "3.0 mA.
15
* G
* G
) e
= 10 kW • C
2
3
opens the feedback loop of A
*t
can be trimmed through the
t A
Q
Q
X2
X2
RFNL
RFNL
) Ga
16
18
) e
) e
R
*t
*t
FNL
t R
t R
) G
) G
A
RFNL
RFNL
R
is a 10 kW
is a 10 kW
R
is
3

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