max9706etxt Maxim Integrated Products, Inc., max9706etxt Datasheet - Page 13

• Manufacturer Part Number: max9706etxt
• Description: 3-channel, 2.3w, Filterless Class D Amplifiers With Active Crossover
• Manufacturer: Maxim Integrated Products, Inc.

The MAX9706/MAX9707 combine three high-efficiency
Class D amplifiers with an active crossover to provide
stereo highpass outputs, and a mono lowpass output
(Figure 1). All three channels deliver up to 2.3W per
channel into 4Ω when operating from a 5V supply.
An internal active filter processes the stereo inputs (left
and right) into stereo highpass and mono lowpass out-
puts. The crossover frequency is pin-selectable to four
different frequencies to accommodate a variety of
speaker configurations.
The internal Class D amplifiers feature low-EMI, spread-
spectrum outputs. No output filters are required.
The MAX9706 features Maxim’s patented DirectDrive
headphone amplifier, providing ground-referenced
headphone outputs without the need for bulky coupling
capacitors. The headphone outputs are capable of
delivering 95mW per channel into 16Ω from a 3.3V sup-
ply, and are protected against ESD up to ±8kV.
MAX9706 MAX9707
EP
27
28
29
30
32
33
35
36
—
—
3-Channel, 2.3W, Filterless Class D Amplifiers
PIN
16–19
9–13,
EP
27
28
29
30
32
33
35
36
15
______________________________________________________________________________________
MONO_OUT
Detailed Description
OUTM+
MGAIN
OUTM-
NAME
GAIN2
GAIN1
N.C.
INR
INL
I.C.
EP
Right-Channel Audio Input. Connect the right-channel audio signal to INR with a series
capacitor. INR has a 25kΩ typical input impedance.
Mono Gain Control. Connect MGAIN to GND, V
MONO channel with respect to the left and right channels. See Table 3.
Amplifier Gain-Control Input. Connect GAIN1 and GAIN2 to GND or V
left and right channels. See Tables 2 and 4.
Amplifier Gain-Control Input. Connect GAIN1 and GAIN2 to GND or V
left and right channels. See Tables 2 and 4.
Mono-Speaker Negative Terminal
Mono-Speaker Positive Terminal
Mono Line-Level Output. MONO_OUT is the monaural output of the summed left and right low-
frequency signals.
Left-Channel Audio Input. Connect the left-channel audio signal to INL with a series capacitor.
INL has a 25kΩ typical input impedance.
No Connection. Not internally connected.
Internally Connected. Connect to GND.
Exposed Pad. The external pad lowers the package’s thermal impedance by providing a
direct heat conduction path from the die to the PC board. The exposed pad is not internally
connected. Connect the exposed pad to GND.
Figure 1. Speaker Arrangement
with Active Crossover
RIGHT IN
LEFT IN
FUNCTION
Pin Description (continued)
DD
, or leave floating to set the gain of the
MAX9706
MAX9707
LPF
HPF
HPF
DD
DD
AMPLIFIER
AMPLIFIER
AMPLIFIER
CLASS D
CLASS D
CLASS D
to set the gain of the
to set the gain of the
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