MAXIM MAX4936, MAX4939 Technical data

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 dur­ing 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 dur­ing 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.

Ordering Information/Selector Guide

Features

S Low Power: Low Impedance (5ω) with 1.5mA Bias

Current Only

S Low Noise < 0.5nV/√Hz (typ) with 1.5mA Bias

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

MAX4936–MAX4939

PART

MAX4936CTN+ Yes Yes Yes
MAX4937CTN+ No Yes Yes
MAX4938CTN+** Yes Yes No
MAX4939CTN+** No Yes No

+Denotes a lead(Pb)-free/RoHS-compliant package.
*EP = Exposed pad.

**Future product—contact factory for availability.

SPI is a trademark of Motorola, Inc.

LOW-VOLTAGE

ISOLATION

_______________________________________________________________ Maxim Integrated Products 1

HIGH-VOLTAGE

PROTECTION

OUTPUT CLAMP TEMP RANGE PIN-PACKAGE

0NC to +70NC
0NC to +70NC
0NC to +70NC
0NC to +70NC

56 TQFN-EP*
56 TQFN-EP*
56 TQFN-EP*
56 TQFN-EP*

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

ABSOLUTE MAXIMUM RATINGS

(All voltages referenced to GND, unless otherwise noted.)

VDD Positive Supply Voltage ...................................-0.3V to +6V

VCC, LVCC_ Positive Supply Voltage ....................-0.3V to +6V

VEE, 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

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)

MAX4936–MAX4939

TQFN

Junction-to-Ambient Thermal Resistance (qJA) ...........44°C/W

Junction-to-Case Thermal Resistance (qJC) ................. 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.

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 (TA = +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

ELECTRICAL CHARACTERISTICS

(VDD = +1.62V to +5.5V, VCC = +2.7V to +5.5V, VEE = -2.7V to -5.5V, V
unless otherwise noted. Typical values are at TA = +25NC.) (Note 2)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

STATIC CHARACTERISTICS

HV_ Input Voltage Range V

|Difference Across Any or All
HV_ |

COM_ Output Voltage Range V

COM_ Input Voltage Range V

|Difference Across Any or All
COM_ |

NO_ Output Voltage Range V

HV_ to COM_ Continuous
Current

HV_ to COM_ Drop V

Diode Bridge Voltage Offset V

IRHV_

ORCM_

IRCM_

ORNO_

I

CN_

CN_

OFF_

MAX4936/MAX4938 only -115 +115 V

MAX4936/MAX4938 only 220 V

|V

| R +2V, I

HV_

= Q100mA (MAX4936/

HV_

MAX4938 only)

V

CC

= +5V, V

= -5V, |V

EE

RL = 200I, CL = 30pF, I
(MAX4936/MAX4937 only)

V

CC

= +5V, V

= -5V, |V

EE

RL = 200I, CL = 30pF, I

V

= 0V (MAX4936/MAX4938 only) -200 +200 mA

COM_

V

COM_

= 0V, I

CN_

= Q2A

(MAX4936/MAX4938 only)

V

= +5V, V

CC

= -5V, COM_ = unconnected,

EE

NO_ = unconnected, ICH = 1.5mA

= 0V, LVCC_ = VCC, LVEE_ = VEE, TA = T

CLR

V

HV_

- 1

V

HV_

0.85

-115 +115 V

| R +2V,

COM_

CH_

COM_

CH_

= 10mA

| < +0.4V,

= 1.5mA

-1

V

COM_

- 0.2

Q0.75

V

COM_

Q 0.1

Q2

-200 +200 mV

Q

V

to T

MIN

V

HV_

+ 1

220 V

+1

COM_

+ 0.2

MAX

V

V

V

,

2 ______________________________________________________________________________________

Octal High-Voltage Transmit/Receive Switches

ELECTRICAL CHARACTERISTICS (continued)

(VDD = +1.62V to +5.5V, VCC = +2.7V to +5.5V, VEE = -2.7V to -5.5V, V
unless otherwise noted. Typical values are at TA = +25NC.) (Note 2)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

HV_ Off-Leakage Current I

LHV_

- V

HV_

(MAX4936/MAX4938 only)

|V

- V

HV_

COM_

COM_

| < +0.3V, V

| < +0.3V, V

|V

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) -1 +1

|V

| < +0.3V,

NO_ Off-Leakage Current I

LNO_

NO_

switch is off

DYNAMIC CHARACTERISTICS

V

= +5V, VEE = -5V, RL = 200I,

Diode Bridge Turn-On Time t

ON

CC

ICH = 1.5mA, CL = 30pF, V
Figure 1

V

= +5V, VEE = -5V, RL = 200I,

Diode Bridge Turn-Off Time t

OFF

CC

ICH = 1.5mA, CL = 30pF, V
Figure 1

Reverse Recovery Time t
SPI Power-Up Delay t

Small-Signal COM_ to NO_ On
Impedance

R

RR

DLY

ICOM_

I

= I

FWD

V

CC

= 10mA 450 ns

RVR

= +5V, VEE = -5V, V

ICH = 1.5mA, f = 5MHz

COM_ to NO_, switch is on,

-3dB Bandwidth BW

|V

COM_

| < +0.4V, V

RL = 200I, CL = 30pF, ICH = 1.5mA

= 0V, LVCC_ = VCC, LVEE_ = VEE, TA = T

CLR

= 0V

COM_

HV_

= 0V,

-3 +3

-3 +3

-1 +1

MAX4936/MAX4937 -2 +2
MAX4938/MAX4939 -1 +1

COM_

COM_

= Q0.4V,

= Q0.4V,

200 ns

500

= 0V,

NO_

= +5V, VEE = -5V,

CC

4.5

65 MHz

5

MIN

to T

MAX

FA

FA

FA

FA

FA

ms

Fs

I

MAX4936–MAX4939

,

Off-Isolation V

Crosstalk V

_______________________________________________________________________________________ 3

ISO

CT

HV_ to COM_, |V
V

= +5V, VEE = -5V, RL = 100I,

CC

HV_

- V

COM_

| < +0.3V,

CL = 100pF, f = 1MHz
(MAX4936/MAX4938 only)

COM_ to NO_, switch is off, V

CC

= +5V,

VEE = -5V, RL = 200I, CL = 30pF, f = 1MHz

Between any two HV_ to COM_ channels,
|V

| R +2V, V

HV_

CC

= +5V,
VEE = -5V, RL = 100I, CL = 100pF,
f = 5MHz (MAX4936/MAX4938 only)

Between any two COM_ to NO_ channels,
switch is on, |V

COM_

| < +0.4V, V

CC

= +5V,
VEE = -5V, RL = 200I, CL = 30pF,
ICH = 1.5mA, f = 5MHz

-50
dB

-75

-60

dB

-71

Octal High-Voltage Transmit/Receive Switches

ELECTRICAL CHARACTERISTICS (continued)

(VDD = +1.62V to +5.5V, VCC = +2.7V to +5.5V, VEE = -2.7V to -5.5V, V
unless otherwise noted. Typical values are at TA = +25NC.) (Note 2)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

HV_ to COM_, |V
VEE = -5V, RL = 100I, CL = 100pF,
f = 5MHz (MAX4936/MAX4938 only)

2nd Harmonic Distortion HD2

COM_ to NO_, switch is on, |V
V

= +5V, VEE = -5V, RL = 200I,

CC

CL = 30pF, ICH = 1.5mA, f = 5MHz

HV_ to COM_, |V
VEE = -5V, RL = 100I, CL = 100pF,
f = 5MHz (MAX4936/MAX4938 only)

3rd Harmonic Distortion HD3

COM_ to NO_, switch is on, |V
V

= +5V, VEE = -5V, RL = 200I,

CC

MAX4936–MAX4939

CL = 30pF, ICH = 1.5mA, f = 5MHz

COM_ to NO_, switch is on,
Two-Tone Intermodulation
Distortion (Note 3)

IMD3

|V

| < +0.4V, V

COM_

RL = 200I, CL = 30pF, ICH = 1.5mA,

f1 = 5MHz, f2 = 5.01MHz

|V

- V

HV_

HV_

- V

COM_

COM_

HV_ Off Capacitance C

COM_ Off Capacitance C

HV_(OFF)

COM_(OFF)

(MAX4936/MAX4938 only)

|V

(MAX4936/MAX4938 only)

Switch is off (MAX4937/MAX4939 only) 12
NO_ On Capacitance C
NO_ Off Capacitance C

NO_(ON)

NO_(OFF)

|V

| < +0.4V, switch is on 20 pF

NO_

|V

| < +0.4V, switch is off 7.5 pF

NO_

DIGITAL I/Os (CLR, DIN, DOUT, CLK, LE)

Input High Voltage V

IH

VDD = +2.25V to +5.5V

VDD = +1.62V to +1.98V 1.4

Input Low Voltage V

Input Hysteresis V

Input Leakage Current I
Input Capacitance C
DOUT Low Voltage V

DOUT High Voltage V

IL

HYST

IL

IN

OL

OH

VDD = +2.25V to +5.5V 0.6

VDD = +1.62V to +1.98V 0.4

VDD = +3V 50

VDD = +1.8V 90

CLR, DIN, CLK, LE = GND or V

I

= 5mA 0.4 V

SINK

I

SOURCE

= 5mA

POWER SUPPLY (VDD, VCC, VEE)

Positive Logic Supply Voltage V
Positive Analog Supply Voltage V

Negative Analog Supply
Voltage

DD

CC

V

EE

COM_

COM_

| < +0.3V

| < +0.3V, switch is off

= 0V, LVCC_ = VCC, LVEE_ = VEE, TA = T

CLR

| R +2V, V

| R +2V, V

= +5V, VEE = -5V,

CC

COM_

COM_

= +5V,

CC

| < +0.4V,

= +5V,

CC

| < +0.4V,

V

-

DD

0.5

DD

-1 +1

V

-

DD

0.4

+1.62 +5.5 V

+2.7 +5.5 V

-5.5 -2.7 V

MIN

-90

-95

-90

-115

-77 dBc

12 pF

17

5 pF

to T

MAX

dBc

dBc

pF

V

V

mV

FA

V

,

4 ______________________________________________________________________________________

Octal High-Voltage Transmit/Receive Switches

ELECTRICAL CHARACTERISTICS (continued)

(VDD = +1.62V to +5.5V, VCC = +2.7V to +5.5V, VEE = -2.7V to -5.5V, V
unless otherwise noted. Typical values are at TA = +25NC.) (Note 2)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Positive Logic Supply Current I

Positive Analog Supply Current I

Positive Analog Shutdown
Supply Current

I

CC_SHDN

Negative Analog Supply
Current

Negative Analog Shutdown
Supply Current

On Power-Supply Rejection
Ratio

Off Power-Supply Rejection
Ratio

I

EE_SHDN

PSRR

PSRR

I

DD

CC

EE

CLR, DIN, CLK, LE = GND or V

Per channel, switch is on, V

VEE = -5V, ICH = 1.5mA

CLR = high +1

Per channel, switch is on, V

VEE = -5V, ICH = 1.5mA

CLR = high -1

VCC to NO_ or VEE to NO_, switch is on,

V

ON

= +5V, VEE = -5V, RL = 200I,

CC

CL = 30pF, ICH = 1.5mA, f = 1MHz

VCC to NO_ or VEE to NO_, switch is off,

V

OFF

= +5V, VEE = -5V, RL = 200I,

CC

CL = 30pF, f = 1MHz

LOGIC TIMING (CLR, DIN, DOUT, CLK, LE) (Figure 1)

V

= 3V Q10%

CLK Period t

CLK High Time t

CLK Low Time t

CLK to DOUT Delay t

DIN to CLK Setup Time t

DIN to CLK Hold Time t

CLK to LE Setup Time

LE Low Pulse Width

CLR High Pulse Width t

t

t

CP

CH

CL

DO

DS

DH

CS

WL

WC

DD

V

= 1.8V Q10%

DD

V

= 3V Q10%

DD

V

= 1.8V Q10%

DD

V

= 3V Q10%

DD

V

= 1.8V Q10%

DD

V

= 3V Q10%, CL P 20pF

DD

V

= 1.8V Q10%, CL P 20pF

DD

V

= 3V Q10%

DD

V

= 1.8V Q10%

DD

V

= 3V Q10%

DD

V

= 1.8V Q10%

DD

V

= 3V Q10%

DD

V

= 1.8V Q10%

DD

V

= 3V Q10%

DD

V

= 1.8V Q10%

DD

V

= 3V Q10%

DD

V

= 1.8V Q10%

DD

Note 2: All specifications are 100% production tested at TA = +70NC, unless otherwise noted. Specifications at 0NC are guaran-

teed by design.

Note 3: See the Ultrasound-Specific IMD3 Specification section.

= 0V, LVCC_ = VCC, LVEE_ = VEE, TA = T

CLR

DD

= +5V,

CC

CC

= +5V,

+1.15 +1.5 +2 mA

-2 -1.5 -1.15 mA

-77 dB

-80 dB

50

100

20
45
20
45

3 30

7 70
10
16

4

4
36
65
14
22
20
40

+1

MIN

to T

FA

FA

FA

MAX

ns

ns

ns

ns

ns

ns

ns

ns

ns

MAX4936–MAX4939

,

_______________________________________________________________________________________ 5

Octal High-Voltage Transmit/Receive Switches

OFF

D

N + 1

ON

DIN

LE

CLK

DOUT

T/R SWITCH

MAX4936–MAX4939

CLR

t

WC

Figure 1. Serial Interface Timing

50%

50%

D

N

50%

t

DS

50%50%

50%

t

WL

50%

t

CS

t

DH

t

DO

50%

t

OFF

90%

50%

10%

D

N - 1

t

ON

6 ______________________________________________________________________________________