Datasheet

_
+
V
DD
V
O+
V
O-
GND
ToBattery
C
s
Bias
Circuitry
IN-
IN+
+
-
IN
SHUTDOWN
R
I
R
I
R
F
R
F
C
I
C
I
C
( )
BYPASS
(Optional)
_
+
V
DD
V
O+
V
O-
GND
ToBattery
C
s
Bias
Circuitry
IN-
IN+
IN
SHUTDOWN
R
I
R
F
C
I
C
I
R
I
R
F
C
( )
BYPASS
(Optional)
Bypass Capacitor (C
BYPASS
) and Start-Up Time
Selecting Components
Resistors (R
F
and R
I
)
Gain = R
F
/R
I
(1)
TPA6203A1
SLOS364F – MARCH 2002 – REVISED JUNE 2008 .......................................................................................................................................................... www.ti.com
Figure 29. Differential Input Application Schematic Optimized With Input Capacitors
Figure 30. Single-Ended Input Application Schematic
The internal voltage divider at the BYPASS pin of this
device sets a mid-supply voltage for internal
references and sets the output common mode
The input (R
I
) and feedback resistors (R
F
) set the
voltage to V
DD
/2. Adding a capacitor to this pin filters
gain of the amplifier according to Equation 1 .
any noise into this pin and increases the k
SVR
.
C
(BYPASS)
also determines the rise time of V
O+
and V
O-
when the device is taken out of shutdown. The larger
R
F
and R
I
should range from 1 k Ω to 100 k Ω . Most
the capacitor, the slower the rise time. Although the
graphs were taken with R
F
= R
I
= 20 k Ω .
output rise time depends on the bypass capacitor
Resistor matching is very important in fully differential
value, the device passes audio 4 µ s after taken out of
amplifiers. The balance of the output on the reference
shutdown and the gain is slowly ramped up based on
voltage depends on matched ratios of the resistors.
C
(BYPASS)
.
CMRR, PSRR, and the cancellation of the second
To minimize pops and clicks, design the circuit so the
harmonic distortion diminishes if resistor mismatch
impedance (resistance and capacitance) detected by
occurs. Therefore, it is recommended to use 1%
both inputs, IN+ and IN-, is equal.
tolerance resistors or better to keep the performance
optimized.
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