19-5541; Rev 1; 3/11
Octal High-Voltage Transmit/Receive Switches
General Description
The MAX4936–MAX4939 are octal, high-voltage, transmit/
receive (T/R) switches. The T/R switches are based on
a diode bridge topology, and the amount of current
in the diode bridges can be programmed through an
SPIK interface. All devices feature a latch-clear input
to asynchronously turn off all T/R switches and put the
device into a low-power shutdown mode. The MAX4936/
MAX4938 include the T/R switch and grass-clipping
diodes, performing both transmit and receive operations.
The MAX4937/MAX4939 include just the T/R switch and
perform the receive operation only.
The MAX4936/MAX4938 transmit path is low impedance
during high-voltage transmit and high impedance during
low-voltage receive, providing isolation between transmit
and receive circuitry. The high-voltage transmit path is
high bandwidth, low distortion, and low jitter.
The receive path for all devices is low impedance dur-
ing low-voltage receive and high impedance during
high-voltage transmit, providing protection to the receive
circuitry. The low-voltage receive path is high bandwidth,
low noise, low distortion, and low jitter. Each T/R switch
can be individually programmed on or off, allowing these
devices to also be used as receive path multiplexers.
The MAX4936/MAX4937 feature clamping diodes to
protect the receiver input from voltage spikes due to
leakage currents flowing through the T/R switches dur-
ing transmission. The MAX4938/MAX4939 do not have
clamping diodes and rely on clamping diodes integrated
in the receiver front end.
All devices are available in a small, 56-pin, 5mm x 11mm
TQFN package, and are specified over the commercial
0NC to +70NC temperature range.
Current Only
S
Low Noise < 0.5nV/√Hz (typ) with 1.5mA Bias
Features
S
Low Power: Low Impedance (5ω) with 1.5mA Bias
MAX4936–MAX4939
Current Only
S
Wide -3dB Bandwidth 65MHz (typ)
S
Easy Programming with SPI Interface
S
High Density (8 Channels per Package)
S
Grass-Clipping Diodes with Low-Voltage Isolation
(MAX4936/MAX4938)
S
Output Clamp Diodes for Receiver Protection
(MAX4936/MAX4937)
S
Global Shutdown Control (CLR)
S
Each T/R Switch Can Be Individually Programmed
On or Off
S
Low-Voltage Receive Path with High-Voltage
Protection
S
Space-Saving, 5mm x 11mm, 56-Pin TQFN Package
Applications
Medical/Industrial Imaging
Ultrasound
High-Voltage Transmit and Low-Voltage Isolation
Ordering Information/Selector Guide
PART
MAX4936CTN+
MAX4937CTN+
MAX4938CTN+**
MAX4939CTN+**
LOW-VOLTAGE
ISOLATION
Yes
No
Yes
No
HIGH-VOLTAGE
PROTECTION
Yes
Yes
Yes
Yes
OUTPUT CLAMP
Yes
Yes
No
No
TEMP RANGE
0NC to +70NC
0NC to +70NC
0NC to +70NC
0NC to +70NC
PIN-PACKAGE
56 TQFN-EP*
56 TQFN-EP*
56 TQFN-EP*
56 TQFN-EP*
+Denotes
a lead(Pb)-free/RoHS-compliant package.
*EP
= Exposed pad.
**Future product—contact factory for availability.
SPI is a trademark of Motorola, Inc.
_______________________________________________________________
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.
Octal High-Voltage Transmit/Receive Switches
MAX4936–MAX4939
ABSOLUTE MAXIMUM RATINGS
(All voltages referenced to GND, unless otherwise noted.)
V
DD
Positive Supply Voltage ...................................-0.3V to +6V
V
CC
, LVCC_ Positive Supply Voltage ....................-0.3V to +6V
V
EE
, LVEE_ Negative Supply Voltage ....................-6V to +0.3V
CLK, DIN, CLR,
LE
Input Voltage ..........................-0.3V to +6V
DOUT Output Voltage ..............................-0.3V to (V
DD
+ 0.3V)
HV_ Input Voltage (MAX4936/MAX4938) ..........-120V to +120V
COM_ Input/Output Voltage ...............................-120V to +120V
NO_ Output Voltage (MAX4936/MAX4937) ......................
Q1.5V
NO_ Output Voltage (MAX4938/MAX4939) .........................
Q6V
Voltage Difference Across Any or
All HV_ (MAX4936/MAX4938) ......................................
Q230V
Voltage Difference Across Any or All COM_ ..................
Q230V
Continuous Current (HV_ to COM_ ) (MAX4936/MAX4938)..Q250mA
Continuous Current (Any Other Terminal).....................
Q100mA
Peak Current (HV_ to COM_ ) (MAX4936/MAX4938)
(Pulsed at 1ms, 0.1% Duty Cycle) ................................
Q2.5A
Continuous Power Dissipation (T
A
= +70NC)
TQFN (derate 41.0mW/NC above +70NC) .................3279mW
Operating Temperature Range ............................. 0NC to +70NC
Storage Temperature Range............................ -65NC to +150NC
Junction Temperature ................................................... +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
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.
PACKAGE THERMAL CHARACTERISTICS (Note 1)
TQFN
Junction-to-Ambient Thermal Resistance (q
JA
) ...........44°C/W
Junction-to-Case Thermal Resistance (q
JC
) .................10°C/W
Note 1:
Package thermal resistance 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
(V
DD
= +1.62V to +5.5V, V
CC
= +2.7V to +5.5V, V
EE
= -2.7V to -5.5V, V
CLR
= 0V, LVCC_ = V
CC
, LVEE_ = V
EE
, T
A
= T
MIN
to T
MAX
,
unless otherwise noted. Typical values are at T
A
= +25NC.) (Note 2)
PARAMETER
STATIC CHARACTERISTICS
HV_ Input Voltage Range
|Difference Across Any or All
HV_ |
COM_ Output Voltage Range
COM_ Input Voltage Range
|Difference Across Any or All
COM_ |
V
CC
= +5V, V
EE
= -5V, |V
COM_
|
R
+2V,
R
L
= 200I, C
L
= 30pF, I
CH_
= 10mA
(MAX4936/MAX4937 only)
V
CC
= +5V, V
EE
= -5V, |V
COM_
| < +0.4V,
R
L
= 200I, C
L
= 30pF, I
CH_
= 1.5mA
HV_ to COM_ Continuous
Current
HV_ to COM_ Drop
Diode Bridge Voltage Offset
I
CN_
V
CN_
V
OFF_
V
COM_
= 0V (MAX4936/MAX4938 only)
V
COM_
= 0V, I
CN_
=
Q2A
(MAX4936/MAX4938 only)
V
CC
= +5V, V
EE
= -5V, COM_ = unconnected,
NO_ = unconnected, I
CH
= 1.5mA
-200
-1
V
COM_
- 0.2
-200
Q2
+200
Q0.75
V
COM_
Q
0.1
V
ORCM_
V
IRCM_
V
IRHV_
MAX4936/MAX4938 only
MAX4936/MAX4938 only
|V
HV_
|
R
+2V, I
HV_
=
Q100mA
(MAX4936/
MAX4938 only)
V
HV_
-1
-115
V
HV_
Q
0.85
-115
+115
220
V
HV_
+1
+115
220
V
V
V
V
V
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
+1
V
V
COM_
+ 0.2
+200
mA
V
mV
NO_ Output Voltage Range
V
ORNO_
2
______________________________________________________________________________________
Octal High-Voltage Transmit/Receive Switches
ELECTRICAL CHARACTERISTICS (continued)
(V
DD
= +1.62V to +5.5V, V
CC
= +2.7V to +5.5V, V
EE
= -2.7V to -5.5V, V
CLR
= 0V, LVCC_ = V
CC
, LVEE_ = V
EE
, T
A
= T
MIN
to T
MAX
,
unless otherwise noted. Typical values are at T
A
= +25NC.) (Note 2)
PARAMETER
HV_ Off-Leakage Current
SYMBOL
I
LHV_
CONDITIONS
|V
HV_
- V
COM_
| <
+0.3V,
V
COM_
= 0V
(MAX4936/MAX4938 only)
|V
HV_
- V
COM_
| < +0.3V, V
HV_
= 0V,
switch is off (MAX4936/MAX4938 only)
COM_ Off-Leakage Current
I
LCOM_
HV_ = unconnected, switch is off
(MAX4936/MAX4938 only)
Switch is off (MAX4937/MAX4939 only)
NO_ Off-Leakage Current
DYNAMIC CHARACTERISTICS
Diode Bridge Turn-On Time
t
ON
V
CC
= +5V, V
EE
= -5V, R
L
= 200I,
I
CH
= 1.5mA, C
L
= 30pF, V
COM_
=
Q0.4V,
Figure 1
V
CC
= +5V, V
EE
= -5V, R
L
= 200I,
I
CH
= 1.5mA, C
L
= 30pF, V
COM_
=
Q0.4V,
Figure 1
I
FWD
= I
RVR
= 10mA
V
CC
= +5V, V
EE
= -5V, V
NO_
= 0V,
I
CH
= 1.5mA, f = 5MHz
COM_ to NO_, switch is on,
|V
COM_
| < +0.4V, V
CC
= +5V, V
EE
= -5V,
R
L
= 200I, C
L
= 30pF, I
CH
= 1.5mA
HV_ to COM_, |V
HV_
- V
COM_
| < +0.3V,
V
CC
= +5V, V
EE
= -5V, R
L
= 100I,
C
L
= 100pF, f = 1MHz
(MAX4936/MAX4938 only)
COM_ to NO_, switch is off, V
CC
= +5V,
V
EE
= -5V, R
L
= 200I, C
L
= 30pF, f = 1MHz
Between any two HV_ to COM_ channels,
|V
HV_
|
R
+2V, V
CC
= +5V,
V
EE
= -5V, R
L
= 100I, C
L
= 100pF,
f = 5MHz (MAX4936/MAX4938 only)
Between any two COM_ to NO_ channels,
switch is on, |V
COM_
| < +0.4V, V
CC
= +5V,
V
EE
= -5V, R
L
= 200I, C
L
= 30pF,
I
CH
= 1.5mA, f = 5MHz
450
500
4.5
200
ns
I
LNO_
|V
NO_
| < +0.3V,
switch is off
MAX4936/MAX4937
MAX4938/MAX4939
MIN
-3
-3
-1
-1
-2
-1
TYP
MAX
+3
+3
+1
+1
+2
+1
UNITS
FA
FA
FA
FA
FA
MAX4936–MAX4939
Diode Bridge Turn-Off Time
Reverse Recovery Time
SPI Power-Up Delay
Small-Signal COM_ to NO_ On
Impedance
-3dB Bandwidth
t
OFF
t
RR
t
DLY
R
ICOM_
5
ms
ns
Fs
I
BW
65
MHz
-50
dB
-75
Off-Isolation
V
ISO
-60
dB
-71
Crosstalk
V
CT
_______________________________________________________________________________________
3
Octal High-Voltage Transmit/Receive Switches
MAX4936–MAX4939
ELECTRICAL CHARACTERISTICS (continued)
(V
DD
= +1.62V to +5.5V, V
CC
= +2.7V to +5.5V, V
EE
= -2.7V to -5.5V, V
CLR
= 0V, LVCC_ = V
CC
, LVEE_ = V
EE
, T
A
= T
MIN
to T
MAX
,
unless otherwise noted. Typical values are at T
A
= +25NC.) (Note 2)
PARAMETER
SYMBOL
CONDITIONS
HV_ to COM_, |V
COM_
|
R
+2V, V
CC
= +5V,
V
EE
= -5V, R
L
= 100I, C
L
= 100pF,
f = 5MHz (MAX4936/MAX4938 only)
COM_ to NO_, switch is on, |V
COM_
| < +0.4V,
V
CC
= +5V, V
EE
= -5V, R
L
= 200I,
C
L
= 30pF, I
CH
= 1.5mA, f = 5MHz
HV_ to COM_, |V
COM_
|
R
+2V, V
CC
= +5V,
V
EE
= -5V, R
L
= 100I, C
L
= 100pF,
f = 5MHz (MAX4936/MAX4938 only)
COM_ to NO_, switch is on, |V
COM_
| <
+0.4V,
V
CC
= +5V, V
EE
= -5V, R
L
= 200I,
C
L
= 30pF, I
CH
= 1.5mA, f = 5MHz
COM_ to NO_, switch is on,
|V
COM_
| < +0.4V, V
CC
= +5V, V
EE
= -5V,
R
L
= 200I, C
L
= 30pF, I
CH
= 1.5mA,
f
1
= 5MHz, f
2
= 5.01MHz
|V
HV_
- V
COM_
| < +0.3V
(MAX4936/MAX4938 only)
|V
HV_
- V
COM_
| < +0.3V, switch is off
(MAX4936/MAX4938 only)
Switch is off (MAX4937/MAX4939 only)
NO_ On Capacitance
NO_ Off Capacitance
C
NO_(ON)
C
NO_(OFF)
|V
NO_
| < +0.4V, switch is on
|V
NO_
| < +0.4V, switch is off
V
DD
-
0.5
1.4
0.6
0.4
50
90
-1
5
I
SINK
= 5mA
I
SOURCE
= 5mA
V
DD
-
0.4
+1.62
+2.7
-5.5
+5.5
+5.5
-2.7
0.4
+1
V
mV
FA
pF
V
V
MIN
TYP
-90
dBc
-95
MAX
UNITS
2nd Harmonic Distortion
HD2
-90
dBc
-115
3rd Harmonic Distortion
HD3
Two-Tone Intermodulation
Distortion (Note 3)
IMD3
-77
dBc
HV_ Off Capacitance
C
HV_(OFF)
12
17
12
20
7.5
pF
COM_ Off Capacitance
C
COM_(OFF)
pF
pF
pF
DIGITAL I/Os (CLR, DIN, DOUT, CLK,
LE)
Input High Voltage
V
IH
V
DD
= +2.25V to +5.5V
V
DD
= +1.62V to +1.98V
Input Low Voltage
Input Hysteresis
Input Leakage Current
Input Capacitance
DOUT Low Voltage
DOUT High Voltage
POWER SUPPLY (V
DD
, V
CC
, V
EE
)
Positive Logic Supply Voltage
Positive Analog Supply Voltage
Negative Analog Supply
Voltage
4
V
DD
V
CC
V
EE
V
V
V
V
IL
V
HYST
I
IL
C
IN
V
OL
V
OH
V
DD
= +2.25V to +5.5V
V
DD
= +1.62V to +1.98V
V
DD
= +3V
V
DD
= +1.8V
CLR, DIN, CLK,
LE
= GND or V
DD
V
______________________________________________________________________________________
Octal High-Voltage Transmit/Receive Switches
ELECTRICAL CHARACTERISTICS (continued)
(V
DD
= +1.62V to +5.5V, V
CC
= +2.7V to +5.5V, V
EE
= -2.7V to -5.5V, V
CLR
= 0V, LVCC_ = V
CC
, LVEE_ = V
EE
, T
A
= T
MIN
to T
MAX
,
unless otherwise noted. Typical values are at T
A
= +25NC.) (Note 2)
PARAMETER
Positive Logic Supply Current
Positive Analog Supply Current
Positive Analog Shutdown
Supply Current
Negative Analog Supply
Current
Negative Analog Shutdown
Supply Current
On Power-Supply Rejection
Ratio
Off Power-Supply Rejection
Ratio
SYMBOL
I
DD
I
CC
I
CC_SHDN
I
EE
I
EE_SHDN
CONDITIONS
CLR, DIN, CLK,
LE
= GND or V
DD
Per channel, switch is on, V
CC
= +5V,
V
EE
= -5V, I
CH
= 1.5mA
CLR = high
Per channel, switch is on, V
CC
= +5V,
V
EE
= -5V, I
CH
= 1.5mA
CLR = high
V
CC
to NO_ or V
EE
to NO_, switch is on,
V
CC
= +5V, V
EE
= -5V, R
L
= 200I,
C
L
= 30pF, I
CH
= 1.5mA, f = 1MHz
V
CC
to NO_ or V
EE
to NO_, switch is off,
V
CC
= +5V, V
EE
= -5V, R
L
= 200I,
C
L
= 30pF, f = 1MHz
50
100
20
45
20
45
3
7
10
16
4
4
36
65
14
22
20
40
30
70
-2
-1
-1.5
MIN
TYP
MAX
+1
+1.15
+1.5
+2
+1
-1.15
UNITS
FA
mA
FA
mA
FA
MAX4936–MAX4939
PSRR
ON
-77
dB
PSRR
OFF
-80
dB
LOGIC TIMING (CLR, DIN, DOUT, CLK,
LE)
(Figure 1)
V
DD
= 3V
Q10%
CLK Period
t
CP
V
DD
= 1.8V
Q10%
CLK High Time
CLK Low Time
CLK to DOUT Delay
DIN to CLK Setup Time
DIN to CLK Hold Time
CLK to
LE
Setup Time
LE
Low Pulse Width
CLR High Pulse Width
t
CH
t
CL
t
DO
t
DS
t
DH
t
CS
t
WL
t
WC
V
DD
= 3V
Q10%
V
DD
= 1.8V
Q10%
V
DD
= 3V
Q10%
V
DD
= 1.8V
Q10%
V
DD
= 3V
Q10%,
C
L
P
20pF
V
DD
= 1.8V
Q10%,
C
L
P
20pF
V
DD
= 3V
Q10%
V
DD
= 1.8V
Q10%
V
DD
= 3V
Q10%
V
DD
= 1.8V
Q10%
V
DD
= 3V
Q10%
V
DD
= 1.8V
Q10%
V
DD
= 3V
Q10%
V
DD
= 1.8V
Q10%
V
DD
= 3V
Q10%
V
DD
= 1.8V
Q10%
ns
ns
ns
ns
ns
ns
ns
ns
ns
Note 2:
All specifications are 100% production tested at T
A
= +70NC, unless otherwise noted. Specifications at 0NC are guaran-
teed by design.
Note 3:
See the
Ultrasound-Specific IMD3 Specification
section.
_______________________________________________________________________________________
5
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