MAX9754ETI+T Maxim Integrated Products, MAX9754ETI+T Datasheet - Page 15

• Manufacturer Part Number: MAX9754ETI+T
• Description: IC AMP AUDIO PWR 2.2W D 28TQFN
• Manufacturer: Maxim Integrated Products
• Series: DirectDrive™r
• Type: Class Dr

Specifications of MAX9754ETI+T

• Output Type: 2-Channel (Stereo) with Stereo Headphones
• Max Output Power X Channels @ Load: 2.2W x 2 @ 4 Ohm; 62mW x 2 @ 16 Ohm
• Voltage - Supply: 4.5 V ~ 5.5 V
• Features: Depop, Short-Circuit and Thermal Protection, Shutdown
• Mounting Type: Surface Mount
• Package / Case: 28-TQFN Exposed Pad
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Figure 7. Distortion Contributed by DC-Blocking Capacitors
Table 1. MAX9752 Gain Settings
The MAX9752/MAX9753/MAX9754 feature a low-noise
charge pump. The 600kHz switching frequency is well
beyond the audio range, and does not interfere with the
audio signals. The switch drivers feature a controlled
switching speed that minimizes noise generated by turn-
on and turn-off transients. Limiting the switching speed
of the charge pump minimizes the di/dt noise caused by
the parasitic bond wire and trace inductance. Although
not typically required, additional high-frequency ripple
attenuation can be achieved by increasing the size of C2
(see the Functional Diagrams).
The headphone sense input (HPS) monitors the head-
phone jack, and automatically configures the device
based upon the voltage applied at HPS. A voltage of
less than 0.8V sets the device to speaker mode. A volt-
age of greater than 2V disables the speaker amplifiers
and enables the headphone amplifiers.
For automatic headphone detection, connect HPS to the
control pin of a 3-wire headphone jack as shown in
Figure 8. With no headphone present, the output imped-
GAIN2
2.2W, Low-EMI, Stereo, Class D Power Amplifiers
0
0
1
1
0.0001
0.001
GAIN1
0.01
0.1
10
1
0
1
0
1
10
______________________________________________________________________________________
TO DC-BLOCKING CAPACITORS
ALUM/ELEC
ADDITIONAL THD+N DUE
100
Headphone Sense Input (HPS)
MAX9752A
FREQUENCY (Hz)
TANTALUM
10.5
12.0
13.5
with DirectDrive Headphone Amplifiers
9.0
1k
SPEAKER MODE GAIN (dB)
10k
Charge Pump
MAX9752B
100k
15.0
16.5
18.0
19.5
MAX9752C
ance of the headphone amplifier pulls HPS low. When a
headphone plug is inserted into the jack, the control pin
is disconnected from the tip contact and HPS is pulled
to V
The MAX9752/MAX9753/MAX9754 feature an internally
generated, power-supply-independent, common-mode
bias voltage referenced to GND. BIAS provides both
click-and-pop suppression and sets the DC bias level
for the amplifiers. Choose the value of the bypass
capacitor as described in the BIAS Capacitor section.
No external load should be applied to BIAS.
The MAX9752 features externally controlled gain with
four pin-selectable gain ranges. GAIN1 and GAIN2 set
the maximum gain of the MAX9752 speaker and head-
phone amplifiers (Table 1). The voltage at VOL varies
the gain of the speaker and headphone amplifiers, pro-
viding a user-adjusted volume control, see the Analog
Volume Control (VOL, MAX9752) section.
Figure 8. HPS Configuration
10.5
6.0
7.5
9.0
DD
through the internal 100kΩ pullup resistor.
MAX9752
MAX9753
MAX9754
100kΩ
OUTR
HEADPHONE MODE GAIN (dB)
OUTL
HPS
R1
V
DD
0
0
3
3
Gain Selection
MAX9752
Bias
15