MAX9759ETE+T Maxim Integrated Products, MAX9759ETE+T Datasheet - Page 11

• Manufacturer Part Number: MAX9759ETE+T
• Description: IC AMP AUDIO PWR 3.2W D 16TQFN
• Manufacturer: Maxim Integrated Products
• Type: Class Dr

Specifications of MAX9759ETE+T

• Output Type: 1-Channel (Mono)
• Max Output Power X Channels @ Load: 4.3W x 1 @ 3 Ohm
• Voltage - Supply: 3 V ~ 5.5 V
• Features: Depop, Differential Inputs, Mute, Short-Circuit and Thermal Protection, Shutdown
• Mounting Type: Surface Mount
• Package / Case: 16-TQFN Exposed Pad
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

The MAX9759 features a unique spread-spectrum mode
that reduces peak component energy in the wideband
spectrum, improving EMI emissions that may be radiat-
ed by the speaker and cables by 5dB. Proprietary tech-
Figure 1. MAX9759 Outputs with an Input Signal Applied
Table 1. Operating Modes
SYNC INPUT
Clocked
FLOAT
GND
V
DD
V
V
V
IN+
OUT+
IN-
Spread-Spectrum Modulation (SSM) Mode
- V
3.2W, High Efficiency, Low-EMI, Filterless,
OUT-
OUT+
OUT-
______________________________________________________________________________________
FFM with f
FFM with f
SSM with f
FFM with f
t
ON(MIN)
S
S
S
S
= 1100kHz
= 1500kHz
= external clock frequency
= 1200kHz ±70kHz
MODE
t
SW
Class D Audio Amplifier
niques ensure that the cycle-to-cycle variation of the
switching period does not degrade audio reproduction
or efficiency (see the Typical Operating Characteristics).
Select SSM mode by setting SYNC = V
mode, the switching frequency varies by ±70kHz around
the center frequency (1.2MHz). The modulation scheme
remains the same, but the period of the sawtooth wave-
form changes from cycle to cycle (Figure 2). Instead of a
large amount of spectral energy present at multiples of
the switching frequency, the energy is now spread over
a bandwidth that increases with frequency. Above a few
megahertz, the wideband spectrum looks like white
noise for EMI purposes (Figure 3).
DD
. In SSM
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