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Dual/Quad, Unipolar/Bipolar,

High-Voltage Digital Pulsers

MAX4940/MAX4940A

General Description

The MAX4940/MAX4940A integrated circuits generate

high-voltage, high-frequency, unipolar or bipolar pulses

from low-voltage logic inputs. These quad/dual pulsers

feature independent logic inputs, independent high-volt-

age pulser outputs with active clamps and independent

high-voltage supply inputs.

The MAX4940/MAX4940A feature quad, high-voltage puls-

ers with 8.5I output impedance for the high-voltage

outputs and a 21I impedance for the active clamp. The

high-voltage outputs can provide 2.0A (typ) output current.

All devices use two logic inputs per channel to con-

trol the positive and negative pulses. The MAX4940/

MAX4940A have a dedicated input to control the active

clamp. All devices feature an independent enable input

EN. All digital inputs are CMOS compatible (see the

Ordering Information/Selector Guide).

The MAX4940/MAX4940A are available in a 56-pin, 8mm x

8mm, TQFN exposed pad package and are specified over

the 0NC to +70NC commercial temperature range.

Warning: Exercise caution. The MAX4940/MAX4940A are

designed to operate with high voltages.

Applications

Ultrasound Medical Imaging

Flaw Detection

Piezoelectric Drivers

Test Instruments

Cleaning Equipment

Features

S High-Density Quad-Channel Pulser in One

Package

S 0 to +220V Unipolar or Q110V Bipolar Outputs

S 8.5I (typ) Output Impedance and 2.0A (typ)

Output Current

S 21I (typ) Always-On Active Clamp with Integrated

Blocking Diodes

S Integrated Output Diodes (MAX4940A Only)

S No Special Power-Supply Sequencing Required

for Trilevel Applications

S Matched Rise/Fall Times and Matched

Propagation Delays

S CMOS-Compatible Logic Inputs

S 56-Pin, 8mm x 8mm, TQFN Package

19-4591; Rev 0; 4/09

Pin Configuration

Ordering Information/

Selector Guide

Note: Devices operate over the 0°C to +70°C temperature range.

+Denotes a lead(Pb)-free/RoHS-compliant package.

*EP = Exposed pad.

EVALUATION KIT

AVAILABLE

PART

OUTPUT

BLOCKING

DIODE

OUTPUT

CURRENT

(A)

PIN-

PACKAGE

MAX4940CTN+ None 2.0 (typ) 56 TQFN-EP*

MAX4940ACTN+

OUT2A,

OUT2B

2.0 (typ) 56 TQFN-EP*

TOP VIEW

MAX4940

MAX4940A

TQFN

GND

*EP = EXPOSED PAD. CONNECT EP TO V

NN1

*EP

DP1B

DN1B

DN2B

DP2B

GP2B

GN2B

GN1B

GP1B

PP1

GND

OUT1B

GND

DP1A

DN1A

DN2A

DP2A

GP2A

GN2A

GN1A

GP1A

PP1

GND

OUT1A

1 2 3 4 5 6 7 8 9 10 11 12 13 14

42 41 40 39 38 37 36 35 34 33 32 31 30 29

INP1B

CLP1B

INN1B

INN2B

CLP2B

INP2B

AGND

INN2A

CLP2A

INP2A

INN1A

CLP1A

INP1A

NN2

NN1

GND

N.C.

OUT2B

GND

PP2

GND

OUT2A

N.C.

NN2

NN1

GND

Summary of content (18 pages)

PAGE 1
9-4591; Rev 0; 4/09 TION KIT EVALUA BLE IL AVA A Dual/Quad, Unipolar/Bipolar, High-Voltage Digital Pulsers Features The MAX4940/MAX4940A integrated circuits generate high-voltage, high-frequency, unipolar or bipolar pulses from low-voltage logic inputs. These quad/dual pulsers feature independent logic inputs, independent high-voltage pulser outputs with active clamps and independent high-voltage supply inputs.
PAGE 2
MAX4940/MAX4940A Dual/Quad, Unipolar/Bipolar, High-Voltage Digital Pulsers ABSOLUTE MAXIMUM RATINGS (Voltages referenced to GND.) VDD Logic Supply Voltage.......................................-0.3V to +6V VCC Output Driver Positive Supply Voltage...........-0.3V to +15V VEE Output Driver Negative Supply Voltage ........-15V to +0.3V VPP_ High-Positive Supply Voltage.........-0.3V to (VNN_ + 220V) VNN_ Low-Negative Supply Voltage....................-220V to +0.3V VPP1 - VNN1, VPP2 - VNN2 Supply Voltage...
PAGE 3
Dual/Quad, Unipolar/Bipolar, High-Voltage Digital Pulsers (VDD = +3V, VCC = +12V, VEE = -12V, VPP_ = +100V, VNN_ = -100V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25NC.
PAGE 4
MAX4940/MAX4940A Dual/Quad, Unipolar/Bipolar, High-Voltage Digital Pulsers ELECTRICAL CHARACTERISTICS (continued) (VDD = +3V, VCC = +12V, VEE = -12V, VPP_ = +100V, VNN_ = -100V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25NC.
PAGE 5
Dual/Quad, Unipolar/Bipolar, High-Voltage Digital Pulsers (VDD = +3V, VCC = +12V, VEE = -12V, VPP_ = +100V, VNN_ = -100V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25NC.
PAGE 6
Typical Operating Characteristics (continued) (VDD = +3.3V, VCC = +12V, VEE = -12V, VPP_ = +100V, VNN_ = -100V, fOUT = 5MHz, RL = 100I, CL = 100pF, TA = +25NC, unless otherwise noted.) MAX4940 toc05 20 RL = 100I CL = 100pF 15 10 10 5 5 20 30 40 50 TEMPERATURE (NC) 60 1 IPP_ vs. TEMPERATURE 4 PULSES AT 10MHz, PRF = 10kHz 0.75 6 IPP_ (mA) 0.65 0.55 7 9 11 FREQUENCY (MHz) 13 1 15 40 5 4 0.40 0 60 0 70 10 TEMPERATURE (NC) RL = 100I CL = 100pF 4 PULSES AT 10MHz, PRF = 10kHz 0.
PAGE 7
Dual/Quad, Unipolar/Bipolar, High-Voltage Digital Pulsers OUT_ FALL TIME (GND TO VNN_) vs. VCC/VEE SUPPLY VOLTAGE 14 12 10 12 10 8 8 6 6 4 4 2 2 0 0 Q5 Q7.5 Q10 Q12 Q12.6 VCC/VEE SUPPLY VOLTAGE (V) Q4.75 INP_ TO OUT_ RISE PROPAGATION DELAY vs. TEMPERATURE RL = 100I, CL = 100pF Q10 Q12 5 0 10 20 30 40 50 TEMPERATURE (NC) 60 Q7.5 Q10 Q12 Q12.6 INP_ TO OUT_ FALL PROPAGATION DELAY vs. VCC/VEE SUPPLY VOLTAGE INP_ TO OUT_ FALL PROPAGATION DELAY vs.
PAGE 8
MAX4940/MAX4940A Dual/Quad, Unipolar/Bipolar, High-Voltage Digital Pulsers Pin Description PIN NAME 1 INP1A Channel 1A High-Side Logic Input. See the Truth Tables section. FUNCTION 2 CLP1A Channel 1A Clamp Logic Input. Clamp is turned on when CLP1A is high and when INP1A and INN1A are low. See the Truth Table section. 3 INN1A Channel 1A Low-Side Logic Input. See the Truth Tables section. 4 INP2A Channel 2A High-Side Logic Input. See the Truth Tables section.
PAGE 9
Dual/Quad, Unipolar/Bipolar, High-Voltage Digital Pulsers PIN NAME FUNCTION 26, 45 VPP1 28 OUT1B 30, 41 VNN1 Channel 1A, 1B Low-Side Negative Supply Voltage Input. Bypass VNN1 to GND with a 0.1FF capacitor as close as possible to the device. 31, 40 VNN2 Channel 2A, 2B Low-Side Negative Supply Voltage Input. Bypass VNN2 to GND with a 0.1FF capacitor as close as possible to the device. 32, 39 N.C. No Connection. Not connected internally.
PAGE 10
MAX4940/MAX4940A Dual/Quad, Unipolar/Bipolar, High-Voltage Digital Pulsers Detailed Description The MAX4940/MAX4940A are quad high-voltage, highspeed pulsers that can be independently configured for either unipolar/bipolar/multilevel pulse outputs (see Figures 5 and 6.). These devices have independent logic inputs for full pulse control and independent active clamps.
PAGE 11
Dual/Quad, Unipolar/Bipolar, High-Voltage Digital Pulsers The MAX4940/MAX4940A feature protected clamp devices, allowing the clamp circuit to be used in bipolar pulsing circuits (see Figures 3 and 4). A diode in series with the OUT_ output prevents the body diode of the low-side FET from turning on when a voltage lower than GND is present. Another diode in series with the OUT_ output prevents the body diode of the high-side FET from turning on when a voltage higher than ground is present.
PAGE 12
MAX4940/MAX4940A Dual/Quad, Unipolar/Bipolar, High-Voltage Digital Pulsers Exposed Pad and Layout Concerns particular attention to�� minimize �� trace�� lengths �� and use sufficient trace width to reduce inductance. Use of surfacemount components is recommended. The MAX4940/MAX4940A provide an exposed pad (EP) underneath the TQFN package for improved�� thermal performance.
PAGE 13
Dual/Quad, Unipolar/Bipolar, High-Voltage Digital Pulsers OUT_ (INP_ = HIGH) GND 10% OUT_ (INN_ = HIGH) 10% tDI EN 50% tEN 50% CLP_ = HIGH Figure 2.
PAGE 14
MAX4940/MAX4940A Dual/Quad, Unipolar/Bipolar, High-Voltage Digital Pulsers Functional Diagrams VDD VCC_ VDD CDP_ CGP_ VPP_ VCC_ LEVEL SHIFTER INP_ CDP_ CGP_A GND VDD LEVEL SHIFTER CLP_ CGP_A VEE_ EN OUT_ MAX4940 VDD VCC_ LEVEL SHIFTER GND VDD VCC_ LEVEL SHIFTER INN_ CGN_ CDN_ VNN_ GND VEE_ CDN_ CGN_ Figure 3.
PAGE 15
Dual/Quad, Unipolar/Bipolar, High-Voltage Digital Pulsers VDD VCC_ VDD CDP_ CGP_ VPP_ VCC_ LEVEL SHIFTER INP_ CDP_ CGP_A * GND VDD LEVEL SHIFTER CLP_ CGP_A VEE_ EN OUT_ MAX4940A VDD VCC_ LEVEL SHIFTER GND VDD * VCC_ LEVEL SHIFTER INN_ CGN_ CDN_ VNN_ GND VEE_ CDN_ CGN_ *OUT2A/OUT2B ONLY. Figure 4.
PAGE 16
Typical Application Circuits 3.3nF 3.3nF 3.3nF +3.3V 3.3nF +12V VPP GND OUT1A VPP1 CGP1A CGN1A CGP2A CGN2A CDP2A CDN2A CDN1A VCC CDP1A VDD GND 56 55 54 53 52 51 50 49 48 47 46 45 44 43 + 1 INP1A GND 42 2 CLP1A VNN1 41 3 INN1A VNN2 40 4 INP2A N.C.
PAGE 17
Dual/Quad, Unipolar/Bipolar, High-Voltage Digital Pulsers 3.3nF 3.3nF 3.3nF +3.3V 3.3nF +12V VPP_H GND OUT1A VPP1 CGP1A CGN1A CGP2A CGN2A CDP2A CDN2A CDN1A VCC CDP1A VDD GND 56 55 54 53 52 51 50 49 48 47 46 45 44 43 + 1 INP1A GND 42 2 CLP1A VNN1 41 3 INN1A VNN2 40 4 INP2A N.C.
PAGE 18
MAX4940/MAX4940A Dual/Quad, Unipolar/Bipolar, High-Voltage Digital Pulsers Chip Information PROCESS: BiCMOS Package Information For the latest package outline information and land patterns, go to www.maxim-ic.com/packages. PACKAGE TYPE PACKAGE CODE DOCUMENT NO. 56 TQFN T5688-3 21-0135 Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied.