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PDF MAX4852 Data sheet ( Hoja de datos )
| Número de pieza | MAX4852 | |
| Descripción | (MAX4850 / MAX4852) Dual SPDT Analog Switches | |
| Fabricantes | Maxim Integrated Products | |
| Logotipo |  |
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19-3375; Rev 0; 7/04
Dual SPDT Analog Switches with
Over-Rail Signal Handling
General Description
The MAX4850/MAX4850H/MAX4852/MAX4852H family
of dual SPDT (single-pole/double-throw) switches oper-
ate from a single +2V to +5.5V supply and can handle
signals greater than the supply rail. These switches fea-
ture low 3.5Ω or 3.5Ω/7Ω on-resistance with low on-
capacitance, making them ideal for switching audio
and data signals.
The MAX4850/MAX4850H are configured with two
SPDT switches and feature two comparators for head-
phone detection or mute/send key functions. The
MAX4852 has two SPDT switches with no comparators
for low 1µA supply current.
For over-rail applications, these devices offer either the
pass-through or high-impedance option. For the
MAX4850/MAX4852, the signal (up to 5.5V) passes
through the switch without distortion even when the posi-
tive supply rail is exceeded. For the MAX4850H/
MAX4852H, the switch input becomes high impedance
when the input signal exceeds the supply rail.
The MAX4850/MAX4850H/MAX4852/MAX4852H are
available in the space-saving (3mm x 3mm), 16-pin
TQFN package and operate over the extended temper-
ature range of -40°C to +85°C.
Applications
USB Switching
Audio-Signal Routing
Cellular Phones
Notebook Computers
PDAs and Other Handheld Devices
Features
o USB 2.0 Full Speed (12MB) and USB 1.1 Signal
Switching Compliant
o Switch Signals Greater than VCC
o 0.1ns Differential Skew
o 3.5Ω/7Ω On-Resistance
o 135MHz -3dB Bandwidth
o +2V to +5.5V Supply Range
o 1.8V Logic Compatible
o Low Supply Current
1µA (MAX4852)
5µA (MAX4850)
10µA (MAX4850H/MAX4852H)
o Available in a Space-Saving (3mm x 3mm),
16-Pin TQFN Package
Ordering Information
PART
TEMP RANGE
MAX4850ETE -40°C to +85°C
MAX4850HETE -40°C to +85°C
MAX4852ETE -40°C to +85°C
MAX4852HETE -40°C to +85°C
*EP = Exposed paddle.
PIN-PACKAGE
16 TQFN-EP*
16 TQFN-EP*
16 TQFN-EP*
16 TQFN-EP*
TOP
MARK
ABU
ABV
ABZ
ACA
Pin Configurations and Selector Guide appear at end of
data sheet.
Block Diagrams/Truth Table
NC1
NO1
NC2
NO2
COUT1
COUT2
MAX4850
MAX4850H
3.5Ω
COM1
IN1
IN2
3.5Ω COM2
VCC
3
CIN1
VCC
3
CIN2
MAX4852
MAX4852H
NC1 3.5Ω
COM1
NO1 7Ω IN1
NC2 3.5Ω IN2
COM2
NO2 7Ω
MAX4850_
MAX4852_
IN_ NO_ NC_
0 OFF ON
1 ON OFF
SWITCHES SHOWN FOR
LOGIC 0 INPUT
________________________________________________________________ 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.
1 page  
Dual SPDT Analog Switches with
Over-Rail Signal Handling
(VCC = 3.0V, TA = +25°C, unless otherwise noted.)
Typical Operating Characteristics
MAX4850/MAX4852
ON-RESISTANCE vs. COM VOLTAGE
10
9
VCC = 1.8V
3.5Ω SWITCH
8
7 VCC = 2.0V
6 VCC = 2.3V
5 VCC = 2.5V
4 VCC = 3.0V
3 VCC = 5.0V
2
1
0
0246
COM VOLTAGE (V)
MAX4850H/MAX4852H
ON-RESISTANCE vs. COM VOLTAGE
10
9
VCC = 1.8V
3.5Ω SWITCH
8
VCC = 2.0V
7
6 VCC = 2.3V
5 VCC = 2.5V
4
VCC = 3.0V
3 VCC = 5.0V
2
1
0
0246
COM VOLTAGE (V)
MAX4852
ON-RESISTANCE vs. COM VOLTAGE
45
7Ω SWITCH
40
35 VCC = 1.8V
30
25
VCC = 2.0V
20
15 VCC = 2.3V
10 VCC = 2.5V
VCC = 3.0V VCC = 5.0V
5
0
0246
COM VOLTAGE (V)
MAX4850/MAX4852
ON-RESISTANCE vs. COM VOLTAGE
4.5
VCC = 3.0V
4.0 3.5Ω SWITCH
3.5 TA = +85°C
3.0 TA = +25°C
2.5
2.0
1.5 TA = -40°C
1.0
0.5
0
24
COM VOLTAGE (V)
6
MAX4850H/MAX4852H
ON-RESISTANCE vs. COM VOLTAGE
5.0
VCC = 3.0V
4.5 3.5Ω SWITCH
TA = +85°C
4.0
TA = +25°C
3.5
3.0
2.5
2.0 TA = -40°C
1.5
1.0
0
0.5 1.0 1.5 2.0 2.5 3.0
COM VOLTAGE (V)
MAX4852
ON-RESISTANCE vs. COM VOLTAGE
8
VCC = 3.0V
7Ω SWITCH
7
TA = +85°C
6
5
4 TA = +25°C
3 TA = -40°C
2
0246
COM VOLTAGE (V)
MAX4850/MAX4852
ON-RESISTANCE vs. COM VOLTAGE
3.5
VCC = 5.0V
3.5Ω SWITCH
3.0
TA = +85°C
2.5
TA = +25°C
2.0
1.5
1.0 TA = -40°C
0.5
0
24
COM VOLTAGE (V)
6
MAX4850H/MAX4852H
ON-RESISTANCE vs. COM VOLTAGE
3.5
VCC = 5.0V
3.5Ω SWITCH
3.0
TA = +85°C
2.5 TA = +25°C
2.0
1.5
1.0 TA = -40°C
0.5
0
1234
COM VOLTAGE (V)
5
MAX4852
ON-RESISTANCE vs. COM VOLTAGE
5.5
VCC = 5.0V
5.0 7Ω SWITCH
4.5 TA = +85°C
4.0
TA = +25°C
3.5
3.0
2.5
2.0
1.5
0
TA = -40°C
123456
COM VOLTAGE (V)
_______________________________________________________________________________________ 5
5 Page 
Dual SPDT Analog Switches with
Over-Rail Signal Handling
Detailed Description
The MAX4850/MAX4850H/MAX4852/MAX4852H are low
on-resistance, low-voltage, analog switches that operate
from a +2V to +5.5V single supply and are fully specified
for nominal 3.0V applications. These devices feature
over-rail signal capability that allows signals up to 5.5V
with supply voltages down to 2.0V. These devices are
configured as dual SPDT switches.
These switches have low 50pF on-channel capacitance,
which allows for 12Mbps switching of the data signals for
USB 2.0 full speed/1.1 applications. The MAX485_ _ are
designed to switch D+ and D- USB signals with a guaran-
teed skew of less than 1ns (see Figure 1), as measured
from 50% of the input signal to 50% of the output signal.
The MAX4850_ features a comparator that can be used
for headphone or mute detection. The comparator
threshold is internally generated to be approximately 1/3
of VCC.
Applications Information
Digital Control Inputs
The logic inputs (IN_) accept up to +5.5V even if the
supply voltages are below this level. For example, with a
+3.3V VCC supply, IN_ can be driven low to GND and
high to +5.5V, allowing for mixing of logic levels in a
system. Driving IN_ rail-to-rail minimizes power con-
sumption. For a +2V supply voltage, the logic thresholds
are 0.5V (low) and 1.4V (high); for a +5V supply voltage,
the logic thresholds are 0.8V (low) and 1.8V (high).
Analog Signal Levels
The on-resistance of these switches changes very little
for analog input signals across the entire supply volt-
age range (see Typical Operating Characteristics). The
switches are bidirectional, so NO_, NC_, and COM_
can be either inputs or outputs.
Comparator
The positive terminal of the comparator is internally set to
VCC/3. When the negative terminal (CIN_) is below the
threshold (VCC/3), the comparator output (COUT_) goes
high. When CIN_ rises above VCC/3, COUT_ goes low.
The comparator threshold allows for detection of head-
phones since headphone audio signals are typically
biased to VCC/2.
Power-Supply Sequencing
Caution: Do not exceed the absolute maximum ratings
because stresses beyond the listed ratings may cause
permanent damage to the device.
Proper power-supply sequencing is recommended for
all CMOS devices. Always apply VCC before applying
analog signals, especially if the analog signal is not
current-limited.
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet MAX4852.PDF ] | |
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