MAX9702 Datasheet, PDF (1/32 Pages) Maxim Integrated Products – 1.8W, Filterless, Stereo, Class D Audio Power Amplifier and DirectDrive Stereo Headphone Amplifier

19-3608; Rev 0; 6/05
1.8W, Filterless, Stereo, Class D Audio Power
Amplifier and DirectDrive Stereo Headphone Amplifier
General Description
The MAX9702 combines a highly efficient Class D
speaker amplifier with a high-linearity Class AB head-
phone amplifier. This ensures maximum battery life in
speaker mode and maximum performance in head-
phone mode. The MAX9702 delivers up to 1.8W per
channel into an 8Ω load from a 5V power supply.
Maxim’s 2nd-generation, spread-spectrum modulation
scheme renders the traditional Class D output filter
unnecessary.
The MAX9702 speaker amplifier offers two modulation
schemes: a fixed-frequency (FFM) mode and a spread-
spectrum (SSM) mode that reduces EMI-radiated emis-
sions. The MAX9702 speaker amplifier features a fully
differential architecture, full-bridged (BTL) output, and
comprehensive click-and-pop suppression. The
MAX9702 speaker amplifier features high 75dB PSRR,
low 0.07% THD+N, and SNR in excess of 97dB. Short-
circuit and thermal-overload protection prevent the
device from being damaged during a fault condition.
The headphone amplifier uses Maxim’s patented
DirectDrive^TM architecture that produces a ground-ref-
erenced output from a single supply, eliminating the
need for large DC-blocking capacitors, saving cost,
board space, and component height. A high 80dB
PSRR and low 0.02% THD+N ensures clean, low-distor-
tion amplification of the audio signal.
An I²C interface sets the speaker and headphone gain,
mono, stereo, and mute functions.
The MAX9702 is available in 28-pin thin QFN-EP (5mm
x 5mm x 0.8mm) and 28-pin TSSOP packages. The
MAX9702 is specified over the extended -40°C to
+85°C temperature range.
Applications
Cellular Phones
Notebook PCs
PDAs
Handheld Gaming Consoles
Features
♦ Patented Spread-Spectrum Modulation Reduces
EMI Emissions
♦ Programmable Mono, Stereo, Mute, and Mix
Functions
♦ 1.1W Stereo Output (8Ω, V_DD = 5V)
♦ 48mW Headphone Output (32Ω, V_DD = 3.3V)
♦ 95% Efficiency (R_L = 8Ω, P_O = 1.1W)
♦ High 73dB PSRR (f = 217Hz)
♦ I²C Programmable Gain Up to +21dB
♦ Integrated Click-and-Pop Suppression
♦ Low-Power Shutdown Mode (0.1µA)
♦ Short-Circuit and Thermal-Overload Protection
♦ ±8kV (HBM) ESD-Protected Headphone Driver
Outputs
Ordering Information
PART
PIN–PACKAGE
I²C SLAVE
ADDRESS
PKG
CODE
MAX9702EUI+ 28 TSSOP
MAX9702BEUI+ 28 TSSOP
MAX9702ETI+ 28 TQFN-EP*
MAX9702BETI+ 28 TQFN-EP*
1001100
1001110
1001100
1001110
U28-1
U28-1
T2855-6
T2855-6
Note: All devices specified for -40°C to +85°C operating tem-
perature range.
*EP = Exposed paddle.
+ Denotes lead-free package.
Simplified Block Diagram
RIGHT MODULATOR
AND H-BRIDGE
INR
∑
INM
GAIN
CONTROL
INL
∑
LEFT MODULATOR
AND H-BRIDGE
Pin Configurations appear at end of data sheet.
SHDN
SDA
SCL
*Purchase of I²C components from Maxim Integrated Products,
Inc. or one of its sublicensed Associated Companies, conveys
a license under the Philips I²C Patent Rights to use these com-
SYNC
ponents in an I²C system, provided that the system conforms
to the I²C Standard Specification as defined by Philips.
OSCILLATOR
MAX9702
SYNC_OUT
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.