MAX4410EUD Maxim Integrated Products, MAX4410EUD Datasheet - Page 15

• Manufacturer Part Number: MAX4410EUD
• Description: Audio Amplifiers
• Manufacturer: Maxim Integrated Products

Specifications of MAX4410EUD

• Product: Audio Line Drivers / Receivers
• Output Power: 80 mW
• Thd Plus Noise: 0.00%
• Supply Current: 7 mA
• Maximum Power Dissipation: 727 mW
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Package / Case: TSSOP-14
• Audio Load Resistance: 16 Ohms
• Input Offset Voltage: 0.5 mV
• Minimum Operating Temperature: - 40 C
• Lead Free Status / Rohs Status: No

An additional benefit of the MAX4410 is the internally
generated, negative supply voltage (-V
is used by the MAX4410 to provide the ground-refer-
enced output level. It can, however, also be used to
power other devices within a design. Current draw from
this negative supply (PV
exceeding this will affect the operation of the head-
phone driver. The negative supply voltage appears on
the PV
to adjust the contrast of LCD modules.
When considering the use of PV
that the charge-pump voltage at PV
portional to -V
charge-pump output impedance plot appears in the
Typical Operating Characteristics.
External feedback components set the gain of the
MAX4410. Resistors R
Circuit) set the gain of each amplifier as follows:
To minimize V
than 10kΩ increase V
which in turn increases the amount of DC current flow
to the speaker.
The stability of the MAX4410 is affected by the value of
the feedback resistor (R
the input and parasitic trace capacitance introduces an
additional pole. Adding a capacitor in parallel with R
compensates for this pole. Under typical conditions
with proper layout, the device is stable without the
additional capacitor.
The input capacitor (C
highpass filter that removes the DC bias from an incom-
ing signal (see Typical Application Circuit). The AC-cou-
pling capacitor allows the amplifier to bias the signal to
Table 1. Suggested Capacitor Manufacturers
Note: Please indicate you are using the MAX4410 when contacting these component suppliers.
Taiyo Yuden
TDK
SS
80mW, DirectDrive Stereo Headphone Driver
pin. A typical application is a negative supply
SUPPLIER
OS
DD
Powering Other Circuits from a
, set R
______________________________________________________________________________________
and is not a regulated voltage. The
IN
F
A
OS
V
), in conjunction with R
and R
F
F
SS
= −
due to the input bias current,
). The combination of R
equal to 10kΩ. Values other
) should be limited to 5mA,
Component Selection



Compensation Capacitor
IN
R
R
IN
Gain-Setting Resistors
F
(see Typical Application
SS



Negative Supply
in this manner, note
SS
800-348-2496
847-803-6100
DD
Input Filtering
is roughly pro-
PHONE
). This voltage
IN,
forms a
F
and
F
an optimum DC level. Assuming zero-source impedance,
the -3dB point of the highpass filter is given by:
Choose R
tion. Choose the C
lowest frequency of interest. Setting f
the low-frequency response of the amplifier. Use capaci-
tors whose dielectrics have low-voltage coefficients,
such as tantalum or aluminum electrolytic. Capacitors
with high-voltage coefficients, such as ceramics, may
result in increased distortion at low frequencies.
Other considerations when designing the input filter
include the constraints of the overall system and the
actual frequency band of interest. Although high-fidelity
audio calls for a flat-gain response between 20Hz and
20kHz, portable voice-reproduction devices such as
cellular phones and two-way radios need only concen-
trate on the frequency range of the spoken human voice
(typically 300Hz to 3.5kHz). In addition, speakers used
in portable devices typically have a poor response
below 150Hz. Taking these two factors into considera-
tion, the input filter may not need to be designed for a
20Hz to 20kHz response, saving both board space and
cost due to the use of smaller capacitors.
Use capacitors with an ESR less than 100mΩ for opti-
mum performance. Low-ESR ceramic capacitors mini-
mize the output resistance of the charge pump. For
best performance over the extended temperature
range, select capacitors with an X7R dielectric. Table 1
lists suggested manufacturers.
The value of the flying capacitor (C1) affects the load
regulation and output resistance of the charge pump. A
C1 value that is too small degrades the device’s ability
to provide sufficient current drive, which leads to a loss
of output voltage. Increasing the value of C1 improves
load regulation and reduces the charge-pump output
resistance to an extent. See the Output Power vs.
Charge-Pump Capacitance and Load Resistance
graph in the Typical Operating Characteristics. Above
2.2µF, the on-resistance of the switches and the ESR of
C1 and C2 dominate.
847-925-0899
847-390-4405
IN
FAX
according to the Gain-Setting Resistors sec-
f
−
3
dB
IN
Charge-Pump Capacitor Selection
with Shutdown
=
2π
such that f
R C
IN IN
1
www.t-yuden.com
www.component.tdk.com
Flying Capacitor (C1)
-3dB
-3dB
WEBSITE
is well below the
too high affects
15