MAX4298 Datasheet, PDF (1/14 Pages) Maxim Integrated Products – Ultra-High PSRR Stereo Drivers + Microphone Amp + 100mA Linear Regulator

19-1743; Rev 1; 2/01
Ultra-High PSRR Stereo Drivers +
Microphone Amp + 100mA Linear Regulator
General Description
The MAX4298 and MAX4299 are audio system ICs
designed for single +5V applications. The MAX4299
features a stereo headphone driver, a microphone
amplifier, and a +3.3V linear regulator; the MAX4298
features the stereo headphone driver only. The
MAX4298/ MAX4299 are designed specifically for harsh
digital environments where board space is at a premi-
um and the digital power supply is noisy. The design
uses innovative design techniques to achieve ultra-high
power-supply rejection across the audio signal band
while, at the same time, delivering a high-current Rail-
to-Rail^® output drive capability. The chip is designed to
drive highly capacitive loads that may be encountered
when driving long cables to a remote load such as
desktop/notebook headphones or speakers. These
devices are fully compliant with PC99 standards.
The amplifiers exhibit 115dB of DC power-supply rejec-
tion and 80dB at 100kHz. The output amplifiers are
capable of driving a 1.5V_RMS signal into a 10kΩ load
with 0.0008% THD+N. They can also drive 32Ω head-
phones to 1.2V_RMS with 0.02% distortion. At +3.3V, the
linear regulator can output 100mA of current. The
MAX4298 is available in a tiny 10-pin µMAX while the
MAX4299 is available in the space-saving 16-pin
TSSOP package.
________________________Applications
Notebook and Desktop Audio
Hands-Free Headsets
USB Audio Peripherals
IP Telephones
Wireless Internet Devices
MP3 Players/Recorders
Rail-to-Rail is a registered trademark of Nippon Motorola, Ltd.
PSRR vs. Frequency
-50
-60
-70
-80
-90
-100
-110
-120
-130
-140
-150
100
1k
10k
100k
FREQUENCY (Hz)
Features
o Audio System IC (MAX4299)
Ultra-High PSRR Stereo Headphone Driver
Ultra-High PSRR Microphone Amp
100mA, 3.3V Linear Regulator
o 93dB typ PSRR at 20kHz Operates Directly from
Noisy Digital Supplies
o Clickless/Popless Power-Up, Power-Down, Mute
and Unmute
o PC99-Compliant Output Drivers:
Better than 1V_RMS Output into 16Ω Load and
1.5V_RMS and 0.0008% THD+N into 10kΩ Load
o PC99-Compliant Microphone Amplifier:
0.005% THD+N into 10kΩ Load
o 22nF Capacitive Load Drive Capability
o 4.5V to 5.5V Single-Supply Operation
o Internally Generated Bias Voltage
o All Gains Externally Adjustable
o Available in Space-Saving Packages
10-Pin µMAX (MAX4298)
16-Pin TSSOP (MAX4299)
Ordering Information
PART
TEMP. RANGE PIN-PACKAGE
MAX4298EUB
MAX4298ESD
MAX4299EWP
MAX4299EUE
-40ºC to +85°C
-40ºC to +85°C
-40ºC to +85°C
-40ºC to +85°C
10 µMAX
14 SO
20 SO
16 TSSOP
Typical Operating Circuit appears at end of data sheet.
Pin Configurations
TOP VIEW
OUT1 1
GND 2
IN1 3
BIAS 4
SV_CC 5
MAX4298
10 V_CC
9 OUT2
8 IN2
7 C_BYPASS
6 MUTE
µMAX
Pin Configurations continued at end of data sheet.
________________________________________________________________ Maxim Integrated Products 1
For price, delivery, and to place orders, please contact Maxim Distribution at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.