MAX4233 Maxim, MAX4233 Datasheet - Page 9

• Manufacturer Part Number: MAX4233
• Description: The MAX4230–MAX4234 single/dual/quad, high-output-drive CMOS op amps feature 200mA of peak output current, rail-to-rail input, and output capability from single 2
• Manufacturer: Maxim

For example, the circuit in Figure 1 has a package
power dissipation of 196mW:
where:
V
I
V
ponent of the output voltage.
I
ponent of the output current.
Therefore:
Adding a coupling capacitor improves the package
power dissipation because there is no DC current to the
load, as shown in Figure 2:
Figure 1. MAX4230/MAX4231 Used in Single-Supply Operation
Circuit Example
DC
PEAK
DC
PEAK
V
Rail-to-Rail I/O Op Amps with Shutdown in SC70
IN
= the DC component of the output current.
= the DC component of the output voltage.
= 2V
= the highest positive excursion of the AC com-
I
RMS
RMS
= the highest positive excursion of the AC com-
P-P
≅
=
≅
=
P
C
IC(DISS)
(
I
78 4
3 6
DC
V
.
DD
.
V
_______________________________________________________________________________________
+
mA
−
R
R
−
I
PEAK
RMS
= V
= 196mW
1 8
V
DC
.
2
V
RMS
)
MAX4230
MAX4231
+
+
=
1 0
3.6V
I
V
1 8
.
RMS
32
PEAK
2
.
V
Ω
2
V
High-Output-Drive, 10MHz, 10V/µs,
COS θ
=
+
2 507
1 0
.
.
V
V
/
2
32
RMS
Ω
32Ω
Therefore:
If the configuration in Figure 1 were used with all four of
the MAX4234 amplifiers, the absolute maximum power-
dissipation rating of this package would be exceeded
(see the Absolute Maximum Ratings section).
Two MAX4230/MAX4231s can be used as a single-sup-
ply, stereo headphone driver. The circuit shown in
Figure 2 can deliver 60mW per channel with 1% distor-
tion from a single 5V supply.
The input capacitor (C
a highpass filter that removes the DC bias from the
incoming signal. The -3dB point of the highpass filter is
given by:
Figure 2. Circuit Example: Adding a Coupling Capacitor
Greatly Reduces Power Dissipation of its Package
AUDIO INPUT
AUDIO INPUT
RIGHT
V
LEFT
I
RMS
RMS
C
C
IN
IN
≅
=
≅
=
P
IC(DISS)
I
22 1
1 0
DC
V
PEAK
.
f
V
2
.
−
R
R
V
BIAS
IN
IN
2
3
+
mA
dB
60mW Single-Supply Stereo
=
I
PEAK
RMS
IN
= 15.6mW
= V
=
0 707
.
), in conjunction with R
2
2π
RMS
R C
IN IN
R
MAX4230
V
R
1
=
F
F
RMS
I
0
RMS
A
Headphone Driver
+
C
C
COS θ
OUT
OUT
1 0
.
V
/
2
HEADPHONE JACK
32
TO 32Ω STEREO
HEADSET
Ω
IN
, forms
9