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
庐
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 10k鈩?load
with 0.0008% THD+N. They can also drive 32鈩?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 碌MAX while the
MAX4299 is available in the space-saving 16-pin
TSSOP package.
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 16鈩?Load and
1.5V
RMS
and 0.0008% THD+N into 10k鈩?Load
o
PC99-Compliant Microphone Amplifier:
0.005% THD+N into 10k鈩?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 碌MAX (MAX4298)
16-Pin TSSOP (MAX4299)
MAX4298/MAX4299
________________________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.
PART
MAX4298EUB
MAX4298ESD
MAX4299EWP
MAX4299EUE
Ordering Information
TEMP. RANGE
-40潞C to +85掳C
-40潞C to +85掳C
-40潞C to +85掳C
-40潞C to +85掳C
PIN-PACKAGE
10 碌MAX
14 SO
20 SO
16 TSSOP
Typical Operating Circuit appears at end of data sheet.
PSRR vs. Frequency
MAX4298/9-13
Pin Configurations
TOP VIEW
OUT1 1
GND
IN1
BIAS
SV
CC
2
3
4
5
10 V
CC
9
OUT2
IN2
C
BYPASS
MUTE
-50
-60
-70
-80
PSRR (dB)
-90
-100
-110
-120
-130
-140
-150
100
1k
10k
MAX4298
8
7
6
100k
碌MAX
Pin Configurations continued at end of data sheet.
1
FREQUENCY (Hz)
________________________________________________________________
Maxim Integrated Products
For price, delivery, and to place orders, please contact Maxim Distribution at 1-888-629-4642,
or visit Maxim鈥檚 website at www.maxim-ic.com.
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