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.
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 10k
load
with 0.0008% THD+N. They can also drive 32
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 MAX 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
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
Load and
1.5V
RMS
and 0.0008% THD+N into 10k
Load
o
PC99-Compliant Microphone Amplifier:
0.005% THD+N into 10k
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 MAX (MAX4298)
16-Pin TSSOP (MAX4299)
MAX4298/MAX4299
Ultra-High PSRR Stereo Drivers +
Microphone Amp + 100mA Linear Regulator
________________________________________________________________ Maxim Integrated Products
1
TOP VIEW
1
2
3
4
5
10
9
8
7
6
V
CC
OUT2
IN2
BIAS
IN1
GND
OUT1
MAX4298
MAX
MUTE
SV
CC
C
BYPASS
PSRR vs. Frequency
19-1743; Rev 1; 2/01
Ordering Information
Rail-to-Rail is a registered trademark of Nippon Motorola, Ltd.
Typical Operating Circuit appears at end of data sheet.
PART
TEMP. RANGE
PIN-PACKAGE
MAX4298
EUB
-40C to +85
C
10 MAX
MAX4298ESD
-40C to +85
C
14 SO
MAX4299
EWP
-40C to +85
C
20 SO
MAX4299EUE
-40C to +85
C
16 TSSOP
Pin Configurations
100
1k
10k
100k
FREQUENCY (Hz)
PSRR (dB)
-50
-150
-140
-130
-120
-110
-100
-90
-60
-70
-80
MAX4298/9-13
Pin Configurations continued at end of data sheet.
MAX4298/MAX4299
Ultra-High PSRR Stereo Drivers +
Microphone Amp + 100mA Linear Regulator
2
_______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(V
CC
= SV
CC
= +5V, R
L
=
on all outputs, C
BYPASS
= 1F, C
BIAS
= 1F, C
REG
= 10F (MAX4299), T
A
= T
MIN
to T
MAX
, unless other-
wise noted. Load resistors (R
L
) are terminated to 2.25V. Typical values are at T
A
= +25C. Specifications apply to both MAX4298 and
MAX4299, unless otherwise noted.) (Note 1)
Stresses beyond those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
Supply Voltage (V
CC
) to GND ...............................................+6V
Standby Supply Voltage (SV
CC
) to GND ...............................+6V
REG, FB, REGON to GND ..........................-0.3V to (V
CC
+ 0.3V)
BIAS, C
BYPASS
, MUTE, IN_, MICIN to GND ..............-0.3V to the
Larger of (V
CC
+0.3V) or (SV
CC
+0.3V)
OUT_, MICOUT to GND ................................-0.3V to the Smaller
of +5.5V, or (V
CC
+ 0.3V)
Duration of Output Short-Circuit to GND or V
CC
................10min
Continuous Power Dissipation
10-Pin MAX (derate 5.6mW/
C above +70
C) ...........444mW
14-Pin SO (derate 8.3mW/
C above +70
C)................667mW
20-Pin SO (derate 10.0mW/
C above +70
C)..............800mW
16-Pin TSSOP (derate 9.4mW/
C above +70
C) .........755mW
Operating Temperature Range ..........................-40
C to +85
C
Storage Temperature Range .............................-65
C to +150
C
Lead Temperature (soldering, 10s) .................................+300
C
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Supply Voltage Range
V
CC
Inferred from PSRR test
4.5
5.5
V
MAX4298
10.2
17.5
Quiescent Current
I
CC
MAX4299
10.6
18.0
mA
MAX4298
10.2
17.5
Mute Quiescent Current
MAX4299
10.6
18.0
mA
V
BIAS
= 1.125V, V
CC
= 0
300
500
SV
CC
Current (Note 2)
I
SVCC
V
BIAS
= 2.25V, V
CC
= 5.0V
7
A
DRIVER AMPLIFIERS
Input Offset Voltage
V
OS
1
10
mV
Input Bias Current
I
BIAS
0.2
nA
DC, V
CC
= 4.5V to 5.5V
115
f = 20kHz
93
Power-Supply Rejection
Ratio
PSRR
f = 100kHz
80
dB
R
L
= 10k
1.45
1.59
R
L
= 32
1.2
1.53
Output Drive
V
OUT
R
L
= 16
1.0
1.48
V
RMS
A
V
= -1V/V, f = 1kHz, R
L
= 10k
,
V
OUT
= 1.5V
RMS
0.0008
A
V
= -1V/V, f = 1kHz, R
L
= 32
,
V
OUT
= 1.2V
RMS
, (Notes 3, 4)
0.02
0.1
THD + Noise
A
V
= -1V/V, f = 1kHz, R
L
= 16
,
V
OUT
= 1.0V
RMS
0.04
%
Full-Scale Signal-to-Noise Ratio
(Note 4)
SNR
R
L
= 10k
,
V
OUT
= 1.06V
RMS
, A
V
= -1V/V
105
dB
Capacitive Drive
22
nF
Open-Loop Voltage Gain
A
VOL
R
L
= 32
, 0.55V
V
OUT
V
CC
- 0.55V
76
87
dB
Unity-Gain Bandwidth
GBW
1.3
MHz
MAX4298/MAX4299
Ultra-High PSRR Stereo Drivers +
Microphone Amp + 100mA Linear Regulator
_______________________________________________________________________________________
3
ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= SV
CC
= +5V, R
L
=
on all outputs, C
BYPASS
= 1F, C
BIAS
= 1F, C
REG
= 10F (MAX4299), T
A
= T
MIN
to T
MAX
, unless other-
wise noted. Load resistors (R
L
) are terminated to 2.25V. Typical values are at T
A
= +25C. Specifications apply to both MAX4298 and
MAX4299, unless otherwise noted.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
BIAS VOLTAGE OUTPUT
DC BIAS Voltage
V
BIAS
I
L
= 0
2.13
2.25
2.37
V
Line Regulation
120
dB
Load Regulation
I
L
= 0 to 1
A
50
mV
DIGITAL INPUTS
(MUTE for MAX4298/MAX4299, and REG
ON
for MAX4299)
Input Voltage High
V
INH
2.4
V
Input Voltage Low
V
INL
0.8
V
Input Leakage Current
I
IN
V
IN
= 0 or V
CC
1
A
MICROPHONE AMPLIFIER
(MAX4299 only)
Input Offset Voltage
V
OS
2
10
mV
Input Bias Current
I
BIAS
0.2
nA
DC, V
CC
= 4.5V to 5.5V
115
f = 20kHz
93
Power-Supply Rejection Ratio
PSRR
f = 100kHz
80
dB
Voltage Gain
A
VOL
R
L
= 10k
, 0.13V
V
MICOUT
V
CC
- 0.13V
80
100
dB
Output Drive
V
OUT
R
L
= 10k
1.4
1.58
V
RMS
A
V
= -1V/V
0.005
THD + Noise (Note 4)
THD+N
f = 1kHz, R
L
= 10k
,
V
MICOUT
= 1.5V
RMS
A
V
= -10V/V
0.03
%
Full-Scale Signal-to-Noise Ratio
(Note 4)
SNR
R
L
= 10k
, V
M IC OU T
= 1.06V
R M S
, A
V
= - 10V /V
80
dB
All-Hostile Crosstalk
f = 10kHz (Note 5)
80
dB
Unity Gain Bandwidth
GBW
1
MHz
REGULATOR
(MAX4299 only)
Regulator Output Voltage
V
REG
V
CC
= 4.5V to 5.5V. I
L
= 0 to 100mA, using
internal feedback
3.15
3.3
3.45
V
Line Regulation
V
CC
= 4.5V to 5.5V, I
L
= 50mA
0.2
mV
I
L
= 10mA to 100mA
30
mV
Load Regulation
I
L
= 0 to 100mA
50
mV
FB Voltage
V
FB
Reference for regulator adjustment
1.233
V
Note 1:
All devices are 100% production tested at T
A
= +25C. All temperature limits are guaranteed by design.
Note 2:
Current drawn from SV
CC
when V
CC
< 4V.
Note 3:
Guaranteed by design.
Note 4:
Measurement bandwidth is 20Hz to 22kHz.
Note 5:
Voltage at MICOUT with OUT1 = OUT2 = 1V
RMS
into 32
.
MAX4298/MAX4299
Ultra-High PSRR Stereo Drivers +
Microphone Amp + 100mA Linear Regulator
4
_______________________________________________________________________________________
8.5
9.5
9.0
10.5
10.0
11.0
11.5
4.2
4.8
5.0
4.4
4.6
5.2
5.4
5.6
MAX4298
SUPPLY CURRENT vs. SUPPLY VOLTAGE
MAX4298/99-01
V
CC
(V)
I
CC
(mA)
T
A
= +85
C
T
A
= +25
C
T
A
= -40
C
-0.5
1.0
0.5
0
1.5
2.0
2.5
0
1.0
2.0
POWER-UP/POWER-DOWN
MAX4298/9-02
TIME (s)
OUTPUT VOLTAGE (V)
OUT
SPEAKER
R
L
= 32
-2
0
-1
2
1
3
4
0
1.0
0.5
1.5
2.0
MUTE PERFORMANCE
MAX4298/9-03
TIME (s)
OUTPUT VOLTAGE (V)
OUT
SPEAKER
R
L
= 32
C
AC
= 220
F
-1
1
0
3
2
5
4
6
MAX4298/99-04
TIME (s)
VOLTAGE (V)
0
0.5
1.0
1.5
2.0
POWER-DOWN/POWER-UP with SCHOTTKY
DIODE AND RESERVOIR CAPACITOR
V
CC
= 0
SV
CC
V
OUT
V
CC
= 5V
R
L
= 32
C
AC
= 22O
F
0.0001
100
100k
10k
1k
DRIVER OUT
THD+N vs. FREQUENCY
1
0.01
0.001
0.1
MAX4298/99-05
INPUT FREQUENCY (Hz)
THD+N (%)
BW = 80kHz
BW = 22kHz
R
L
= 10k
A
V
= -1
V
OUT
= 1.5V
RMS
0.0001
100
100k
10k
1k
DRIVER OUT
THD+N vs. FREQUENCY
1
0.01
0.001
0.1
MAX4298/99-06
INPUT FREQUENCY (Hz)
THD+N (%)
R
L
= 32
A
V
= -1
V
OUT
= 1.2V
RMS
BW = 80kHz
BW = 22kHz
0.0001
100
100k
10k
1k
DRIVER OUT
THD+N vs. FREQUENCY
1
0.01
0.001
0.1
MAX4298/99-07
INPUT FREQUENCY (Hz)
THD+N (%)
R
L
= 16
A
V
= -1
V
OUT
= 1V
RMS
BW = 80kHz
BW = 22kHz
10
1
0.1
0.01
0.001
0.0001
0
1
1.5
0.5
2
DRIVER OUT
THD+N vs. AMPLITUDE
MAX4298/99toc08
OUTPUT VOLTAGE (V
RMS
)
THD+N (%)
A
V
= -1
R
L
= 10k
f
IN
= 1kHz
BW = 22kHz
10
1
0.1
0.01
0.001
0.0001
0
1
1.5
0.5
2
DRIVER OUT
THD+N vs. AMPLITUDE
MAX4298/99toc09
OUTPUT VOLTAGE (V
RMS
)
THD+N (%)
R
L
= 32
A
V
= -1
f
IN
= 1kHz
BW = 22kHz
Typical Operating Characteristics
(V
CC
= SV
CC
= +5V, typical operating circuit, T
A
= +25C, unless otherwise noted.)
MAX4298/MAX4299
Ultra-High PSRR Stereo Drivers +
Microphone Amp + 100mA Linear Regulator
_______________________________________________________________________________________
5
10
1
0.1
0.01
0.001
0.0001
0
1
1.5
0.5
2
DRIVER OUT
THD+N vs. AMPLITUDE
MAX4298/99toc10
OUTPUT VOLTAGE (V
RMS
)
THD+N (%)
R
L
= 16
A
V
= -1
f
IN
= 1kHz
BW = 22kHz
100
1k
10k
100k
DRIVER OUT
CHANNEL SEPARATION
vs. INPUT FREQUENCY
MAX4298/9-11
INPUT FREQUENCY (Hz)
CHANNEL SEPARATION (dB)
-60
-120
-110
-100
-90
-80
-70
OUT2 TO OUT1
OUT1 TO OUT2
R
L
= 10k
A
V
= -1
V
OUT
= 1V
RMS
100
1k
10k
100k
DRIVER OUT
MUTED OUTPUT ATTENUATION
vs. INPUT FREQUENCY
MAX4298/9-12
INPUT FREQUENCY (Hz)
MUTED OUTPUT ATTENUATION (dB)
-80
-120
-115
-110
-105
-100
-95
-85
-90
B
C
A
R
L
= 16
A = R
I
= 20k
,
R
F
= 20k
B = R
I
= 10k
,
R
F
= 10k
C = R
I
= 10k
,
R
F
= 20k
100
1k
10k
100k
DRIVER OUT
POWER-SUPPLY REJECTION
RATIO vs. FREQUENCY
MAX4298/9-13
FREQUENCY (Hz)
PSRR (dB)
-50
-150
-140
-130
-120
-110
-100
-90
-60
-70
-80
DRIVER OUT
OPEN-LOOP FREQUENCY RESPONSE
INPUT FREQUENCY (kHz)
0.01
10
100
1000
0.1
1
10,000
GAIN (dB)
90
-10
0
10
20
30
40
50
80
70
60
0
PHASE (deg)
200
20
40
60
80
100
120
180
160
140
GAIN
PHASE
32
|| 15pF
MAX4298/9-14
DRIVER OUT
OPEN-LOOP FREQUENCY RESPONSE
INPUT FREQUENCY (kHz)
0.01
10
100
1000
0.1
1
10,000
GAIN (dB)
90
-10
0
10
20
30
40
50
80
70
60
0
PHASE (deg)
200
20
40
60
80
100
120
180
160
140
GAIN
PHASE
32
|| 1.5nF
MAX4298/9-15
Typical Operating Characteristics (continued)
(V
CC
= SV
CC
= +5V, typical operating circuit, T
A
= +25C, unless otherwise noted.)
DRIVER OUT
OPEN-LOOP FREQUENCY RESPONSE
INPUT FREQUENCY (kHz)
0.01
10
100
1000
0.1
1
10,000
GAIN (dB)
90
-10
0
10
20
30
40
50
80
70
60
0
PHASE (deg)
200
20
40
60
80
100
120
180
160
140
GAIN
PHASE
32k
|| 22nF
MAX4298/9-16
DRIVER OUT
OPEN-LOOP FREQUENCY RESPONSE
INPUT FREQUENCY (kHz)
0.01
10
100
1000
0.1
1
10,000
GAIN (dB)
90
-10
0
10
20
30
40
50
80
70
60
0
PHASE (deg)
200
20
40
60
80
100
120
180
160
140
GAIN
PHASE
10k
|| 15pF
MAX4298/9-17
DRIVER OUT
OPEN-LOOP FREQUENCY RESPONSE
INPUT FREQUENCY (kHz)
0.01
10
100
1000
0.1
1
10,000
GAIN (dB)
90
-10
0
10
20
30
40
50
80
70
60
0
PHASE (deg)
200
20
40
60
80
100
120
180
160
140
GAIN
PHASE
10k
|| 1.5nF
MAX4298/9-18
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