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MAX14778 Datasheet Download - Maxim

Номер произв MAX14778
Описание Dual +-25V Above- and Below-the-Rails 4:1 Analog Multiplexer
Производители Maxim
логотип Maxim логотип 



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MAX14778 Даташит, Описание, Даташиты
19-5929; Rev 1; 6/12
EVALUATION KIT AVAILABLE
MAX14778
Dual ±25V Above- and Below-the-Rails
4:1 Analog Multiplexer
General Description
The MAX14778 dual 4:1 analog multiplexer supports
analog signals up to Q25V with a single 3.0 to 5.5V
supply. Each multiplexer has separate control inputs to
allow independent switching, making the device ideal for
multiplexing different communications signals with the
same connector pins. Extended ESD protection of Q6kV
(Human Body Model) enable direct interfacing to cables
and connectors.
The MAX14778 features a low 1.5I (max) on-resistance
and 3mI (typ) flatness to maximize signal integrity over
the entire common-mode voltage range. Each multiplex-
er can carry up to 300mA of continuous current through
the multiplexer in either direction.
The MAX14778 supports switching of full-speed USB 1.1
signals (12Mbps) and RS-485 data rates of up to 20Mbps.
The MAX14778 is available in a 20-pin (5mm x 5mm)
TQFN package and is specified over the -40NC to +85NC
extended temperature range.
Applications
RS-485/RS-232/USB 1.1 Multiplexing
POS Peripherals
Handheld Industrial Devices
Communication Systems
Audio/Data Multiplexing
Connector Sharing
Gaming Machines
Features
S ±25V Signal Range
S Single 3.0V to 5.5V Supply
S Two Independent Multiplexers
S 1.5I RON (max)
S 3mI RON Flatness (typ)
S 300mA Maximum Current Through Multiplexer
S 78pF Input Capacitance
S 75MHz Large-Signal Bandwidth
S Break-Before-Make Operation
S Extended ESD Protection on A_ and B_ Pins
Q6kV Human Body Model (HBM)
Ordering Information appears at end of data sheet.
For related parts and recommended products to use with this part,
refer to www.maxim-ic.com/MAX14778.related.
Functional Diagram
ENA SA0 SA1
CONTROL A
A0
A1
A2
A3
B0
B1
B2
B3
VDD
BIAS
GENERATION
MAX14778
VP
VN
ACOM
BCOM
CONTROL B
ENB SB0 SB1
GND
����������������������������������������������������������������� Maxim Integrated Products  1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
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MAX14778 Даташит, Описание, Даташиты
MAX14778
Dual ±25V Above- and Below-the-Rails
4:1 Analog Multiplexer
ABSOLUTE MAXIMUM RATINGS
(All voltages referenced to GND.)
VDD...........................................................................-0.3V to +6V
VP............................ -0.3V to the lesser of +52V and (VN + 70V)
VN................. The lesser of (VDD - 40V) and (VP - 70V) to +0.3V
VP to VN..................................................................-0.3V to +70V
ENA, ENB, SA_, SB_................................. -0.3V to (VDD + 0.3V)
A_, ACOM, B_,
BCOM... (VN - 0.3V) to the lesser of (VP + 0.3V) and (VN + 52V)
Continuous Current Through Switch.............................. ±500mA
Continuous Power Dissipation (TA = +70NC)
TQFN (derate 33.3mW/NC above +70NC)...............2666.7mW
Operating Temperature Range........................... -40NC to +85NC
Junction Temperature......................................................+150NC
Storage Temperature Range............................. -65NC to +150NC
Lead Temperature (soldering, 10s) ................................+300NC
Soldering Temperature (reflow).......................................+260NC
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional opera-
tion 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.
PACKAGE THERMAL CHARACTERISTICS (Note 1)
TQFN
Junction-to-Ambient Thermal Resistance (BJA)...........30NC/W
Junction-to-Case Thermal Resistance (BJC)..................2NC/W
Note 1: Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-
layer board. For detailed information on package thermal considerations, refer to www.maxim-ic.com/thermal-tutorial.
ELECTRICAL CHARACTERISTICS
(VDD = 3.0V to 5.5V, TA = -40NC to +85NC, unless otherwise noted. Typical values are at VDD = 5V, TA = +25NC.) (Note 2)
PARAMETER
DC CHARACTERISTICS
Supply Voltage Range
Supply Current
Charge-Pump Threshold
Analog Signal Range
Continuous Current
Through Switch
SYMBOL
VDD
IDD
VDDTH
VIN
ICOM
CONDITIONS
ENA = ENB = high
VENA = VENB = VDD/2
(Note 3)
VDD P VDDTH
VDD > VDDTH
VDD P VDDTH
VDD > VDDTH
Figure 1, switch open or closed
MIN
3.0
-25
-300
TYP
4.27
2.54
4.31
2.59
4.64
MAX
5.5
10
6
10
6
+25
+300
UNITS
V
mA
V
V
mA
On-Resistance
On-Resistance Flatness
A_, B_ Off-Leakage
Current
ACOM, BCOM
Off-Leakage Current
A_, B_ On-Leakage
Current
RON
RFLAT(ON)
IA(OFF),
IB(OFF)
IACOM(OFF),
IBCOM(OFF)
IA(ON),
IB(ON)
Figure 1, ICOM = Q300mA, VIN = Q25V
Figure 1, -25V P VIN P +25V,
ICOM = Q300mA
Figure 2, VIN = 25V, VOUT = 0V
Figure 2, VOUT = 15V, VIN = 0V
Figure 2, VIN = Q25V, ACOM or BCOM
is unconnected
-200
-1
-1
0.84
3
1.5
+200
+1
+1
mΩ
nA
FA
FA
����������������������������������������������������������������� Maxim Integrated Products  2
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MAX14778 Даташит, Описание, Даташиты
MAX14778
Dual ±25V Above- and Below-the-Rails
4:1 Analog Multiplexer
ELECTRICAL CHARACTERISTICS (continued)
(VDD = 3.0V to 5.5V, TA = -40NC to +85NC, unless otherwise noted. Typical values are at VDD = 5V, TA = +25NC.) (Note 2)
PARAMETER
SYMBOL
LOGIC INPUTS (ENA, ENB, SA_, SB_)
Input Logic-Low Voltage
VIL
Input Logic-High Voltage
VIH
AC CHARACTERISTICS
Power-Up Time
Enable Turn-On Time
Enable Turn-Off Time
Break-Before-Make
Interval
Charge Injection
Off-Isolation
Crosstalk
tPOR
tON
tOFF
tBBM
Q
VISO
VCT
CONDITIONS
VDD = 5.5V
VDD = 4.5V
VDD = 3.6V
VDD = 3.0V
VDD = 5.5V
VDD = 4.5V
VDD = 3.6V
VDD = 3.0V
Figure 3, VIN = Q10V, RL = 10kI,
CL = 15pF
Figure 3, VIN = Q10V, RL = 10kI,
CL = 15pF
Figure 4, VIN = Q10V, RL = 10kI,
CL = 15pF
Figure 5, VA_ = 0V, CL = 1nF
Figure 6, VA_ = 1VRMS, f = 100kHz,
RL = 50I, CL = 15pF
Figure 6, f = 100kHz, RS = RL = 50I
MIN
TYP
MAX
UNITS
0.8
0.8
0.7
V
0.7
2.1
2.0
V
1.9
1.7
404
2
ms
ms
1.5 ms
840
1720
-80
-103
Fs
pC
dB
dB
-3dB Bandwidth
BW Figure 6, RS = 50I, RL = 50I
75 MHz
Total Harmonic Distortion
Plus Noise
THD+N
RS = RL = 1kI, f = 20Hz to 20kHz
0.003
%
Input Capacitance
THERMAL PROTECTION
CIN
A_, B_ pins
78 pF
Thermal-Shutdown
Threshold
TSHUT
145 NC
Thermal-Shutdown
Hysteresis
THYST
25 NC
ESD PROTECTION
A_, B_ Pins (Note 4)
All Other Pins
Human Body Model
Human Body Model
Q6 kV
Q2 kV
Note 2: All units are production tested at TA = +25NC. Specifications over temperature are guaranteed by design.
Note 3: When VDD is higher than the charge-pump threshold, the internal 5V regulated charge pump is turned off and the input to
the high-voltage charge pumps is provided by VDD.
Note 4: The MAX14778 requires a 100nF capacitor on both VP and VN to GND to guarantee full ESD protection. See the
Applications Information section for details on ESD test conditions.
����������������������������������������������������������������� Maxim Integrated Products  3
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