19-3775; Rev 2; 5/06
Low-R , Dual-SPST/Single-SPDT Clickless
ON
Switches with Negative Rail Capability
General Description
Features
The MAX4901–MAX4905 switches feature negative
signal capability that allows signals below ground to pass
through without distortion. The MAX4901/MAX4902 are a
dual SPST (single-pole/single-throw) and the MAX4903/
MAX4904/MAX4905 are a single SPDT (single-
pole/double-throw) configuration. These analog switches
operate from a single +1.8V to +5.5V supply and have
low 0.6 on-resistance, making them ideal for switching
audio signals.
♦ Distortion-Free Signal Throughput Down
to V - 5.5V
♦ Comparator for Headphone or
Mute Detection (MAX4905)
♦ Clickless Switches with Internal Shunt Resistors
CC
(MAX4902/MAX4904/MAX4905)
♦ 0.6 (typ) Low On-Resistance (R
♦ 0.25 On-Resistance Flatness
♦ +1.8V to +5.5V Supply Voltage
♦ 0.04% THD
)
ON
The MAX4905 includes a comparator that can be used
for headphone detection or mute/send key function. The
MAX4902/MAX4904/MAX4905 have internal shunt resis-
tors to automatically discharge any capacitance at the
NO_ and NC connection points. This reduces click-and-
pop sounds that occur when switching audio signals
between pre-charged points. A break-before-make fea-
ture and auto-discharge also help to reduce popping.
Pin Configurations
TOP VIEW
BUMPS ON BOTTOM
MAX4903/MAX4904/MAX4905
MAX4901/MAX4902
These SPST and SPDT switches are available in
space-saving 8-pin TDFN and 9-bump UCSP™ pack-
ages and operate over the -40°C to +85°C extended
temperature range.
1
2
3
1
2
3
A
B
C
A
B
C
IN
NO1
N.C.
IN1
V
COM1
NO
CC
Applications
Cell Phones
Notebook Computers
COM N.C. (CMPO) GND
V
GND
IN2
CC
PDAs and Handheld Devices MP3 Players
N.C.
COM2
N.C. (CMP-)
NC
NO2
3 x 3 UCSP
( ) MAX4905 ONLY
3 x 3 UCSP
Pin Configurations continued at end of data sheet.
UCSP is a trademark of Maxim Integrated Products, Inc.
Ordering Information/Selector Guide
PART
PIN-PACKAGE
TOP MARK CONFIGURATION
COMPARATOR
SHUNT
No
PKG CODE
B9-1
MAX4901EBL-T 1.5mm x 1.5mm 9 UCSP-9
AEU
AOW
AEV
AOX
AEY
AOY
AEW
AOZ
AEX
APA
2 x SPST
2 x SPST
2 x SPST
2 x SPST
1 x SPDT
1 x SPDT
1 x SPDT
1 x SPDT
1 x SPDT
1 x SPDT
No
No
No
No
No
No
No
No
Yes
Yes
MAX4901ETA-T
MAX4902EBL-T
MAX4902ETA-T
MAX4903EBL-T
MAX4903ETA-T
MAX4904EBL-T
MAX4904ETA-T
MAX4905EBL-T
MAX4905ETA-T
8 TDFN-8
1.5mm x 1.5mm 9 UCSP-9
8 TDFN-8
No
T833-2
B9-1
Yes
Yes
No
T833-2
B9-1
1.5mm x 1.5mm 9 UCSP-9
8 TDFN-8
No
T833-2
B9-1
1.5mm x 1.5mm 9 UCSP-9
8 TDFN-8
Yes
Yes
Yes
Yes
T833-2
B9-1
1.5mm x 1.5mm 9 UCSP-9
8 TDFN-8
T833-2
Note: All devices operate over the -40°C to +85°C operating temperature range.
________________________________________________________________ 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.