19-4591; Rev 0; 4/09
TION KIT
EVALUA BLE
AVAILA
Dual/Quad, Unipolar/Bipolar,
High-Voltage Digital Pulsers
Features
S
High-Density Quad-Channel Pulser in One
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.
PART
MAX4940CTN+
MAX4940ACTN+
MAX4940/MAX4940A
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
Ordering Information/
Selector Guide
OUTPUT
BLOCKING
DIODE
None
OUT2A,
OUT2B
OUTPUT
CURRENT
(A)
2.0 (typ)
2.0 (typ)
PIN-
PACKAGE
56 TQFN-EP*
56 TQFN-EP*
Applications
Ultrasound Medical Imaging
Flaw Detection
Piezoelectric Drivers
Test Instruments
Cleaning Equipment
TOP VIEW
OUT2A
Note:
Devices operate over the 0°C to +70°C temperature range.
+Denotes
a lead(Pb)-free/RoHS-compliant package.
*EP
= Exposed pad.
Pin Configuration
OUT2B
V
NN1
V
NN2
V
NN2
V
NN1
V
PP2
V
PP2
GND
GND
GND
42 41 40 39 38 37 36 35 34 33 32 31 30 29
OUT1A 43
GND 44
V
PP1
45
C
GP1A
46
C
GN1A
47
C
GN2A
48
C
GP2A
49
C
DP2A
50
C
DN2A
51
C
DN1A
52
C
DP1A
53
V
CC
54
GND 55
V
DD
56
1
INP1A
2
CLP1A
3
INN1A
4
INP2A
5
CLP2A
6
INN2A
7
AGND
8
EN
9
INP2B
10 11 12 13 14
CLP2B
INN2B
INP1B
CLP1B
INN1B
28 OUT1B
27 GND
26 V
PP1
25 C
GP1B
24 C
GN1B
23 C
GN2B
22 C
GP2B
MAX4940
MAX4940A
GND
21 C
DP2B
20 C
DN2B
19 C
DN1B
18 C
DP1B
17 V
CC
16 GND
15 V
EE
N.C.
N.C.
+
*EP
*EP = EXPOSED PAD. CONNECT EP TO V
NN1
.
TQFN
_______________________________________________________________
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.
Dual/Quad, Unipolar/Bipolar,
High-Voltage Digital Pulsers
MAX4940/MAX4940A
ABSOLUTE MAXIMUM RATINGS
(Voltages referenced to GND.)
V
DD
Logic Supply Voltage ......................................-0.3V to +6V
V
CC
Output Driver Positive Supply Voltage ..........-0.3V to +15V
V
EE
Output Driver Negative Supply Voltage ........-15V to +0.3V
V
PP_
High-Positive Supply Voltage ........-0.3V to (V
NN_
+ 220V)
V
NN_
Low-Negative Supply Voltage ...................-220V to +0.3V
V
PP1
- V
NN1
, V
PP2
- V
NN2
Supply Voltage .........-0.6V to +250V
INP_, INN_, CLP_, EN Logic Input ........... -0.3V to (V
DD
+ 0.3V)
C
GN_
Voltage ......................... (-0.3V + V
NN_
) to (+15V + V
NN_
)
C
GP_
Voltage ............................(+0.3V + V
PP_
) to (-15V + V
PP_
)
C
DP_
, C
DN_
Voltage ................................................-0.3V to V
CC
Continuous Power Dissipation (T
A
= +70NC)
56-Pin TQFN (derate 47.6mW/NC above +70NC) .......3809mW
Thermal Resistance (Note 1)
B
JA
................................................................................21NC/W
B
JC
.................................................................................1NC/W
Operating Temperature Range ............................. 0NC to +70NC
Junction Temperature .....................................................+150NC
Storage Temperature Range............................ -65NC to +150NC
Lead Temperature (soldering, 10s) ................................+300NC
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.
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.
ELECTRICAL CHARACTERISTICS
(V
DD
= +3V, V
CC
= +12V, V
EE
= -12V, V
PP_
= +100V, V
NN_
= -100V, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are
at T
A
= +25NC.) (Note 2)
PARAMETER
Logic Supply Voltage
Positive Drive Supply Voltage
Negative Drive Supply Voltage
High-Side Supply Voltage
Low-Side Supply Voltage
High-Side Supply Voltage
Low-Side Supply Voltage
V
PP_
- V
NN_
Supply Voltage
SUPPLY CURRENT (for single channel)
V
INN_
/V
INP_
/V
CLP_
= 0 or V
DD
, V
EN
= 0
V
DD
Supply Current
I
DD
V
EN
= V
DD
, V
CLP_
= 0 or V
DD
, V
INN_
=
V
INP_
, f = 5MHz, one channel switching
V
EN
= 0 (static)
V
EN
= V
DD
(static)
V
EN
= V
DD
, V
CLP_
= 0 or V
DD
, V
INN_
=
V
INP_
, f = 5MHz, V
CC
= +12V, V
DD
= +3V,
one channel switching
V
EN
= V
DD
, V
CLP_
= 0 or V
DD
, V
INN_
=
V
INP_
, f = 5MHz, V
CC
= +5V, V
DD
= +3V,
one channel switching
36
mA
15
100
1
200
1
10
FA
FA
FA
SYMBOL
V
DD
V
CC
V
EE
V
PP1
V
NN1
V
PP2
V
NN2
CONDITIONS
MIN
2.37
4.75
1.05 x
(-V
CC
)
0
-200
0
V
NN1
0
TYP
3
12
-V
CC
MAX
6
12.6
0.95 x
(-V
CC
)
+200
0
V
PP1
0
+200
UNITS
V
V
V
V
V
V
V
V
POWER SUPPLY (V
DD
, V
CC
, V
EE
, V
PP_
, V
NN_
)
V
CC
Supply Current
I
CC_
2
______________________________________________________________________________________
Dual/Quad, Unipolar/Bipolar,
High-Voltage Digital Pulsers
ELECTRICAL CHARACTERISTICS (continued)
(V
DD
= +3V, V
CC
= +12V, V
EE
= -12V, V
PP_
= +100V, V
NN_
= -100V, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are
at T
A
= +25NC.) (Note 2)
PARAMETER
SYMBOL
CONDITIONS
V
EN
= 0 or V
DD
(static)
V
EE
= -5V, V
EN
= V
DD
, V
CLP_
= V
DD
,
PRF = 10kHz, f = 5MHz, four pulses,
no load, one channel switching
V
EE
= -12V, V
EN
= V
DD
, V
CLP_
= V
DD
,
PRF = 10kHz, f = 5MHz, four pulses,
no load, one channel switching
V
EN
= 0 or V
DD
(static)
V
EN
= V
DD
, V
CLP_
= 0 or V
DD
, V
INN_
=
V
INP_
, f = 5MHz, V
PP_
= +5V, V
NN_
= -5V,
no load, one channel switching
V
EN
= V
DD
, V
CLP_
= 0 or V
DD
,
V
PP_
= +80V, V
NN_
= -80V, PRF = 10kHz,
f = 10MHz, four pulses, no load,
one channel switching
V
EN
= 0 or V
DD
(static)
V
EN
= V
DD
, V
CLP_
= 0 or V
DD
, V
INN_
=
V
INP_
, f = 5MHz, V
PP_
= +5V, V
NN_
= -5V,
no load, one channel switching
V
EN
= V
DD
, V
INC_
= 0 or V
DD
,
V
PP_
= +80V, V
NN_
= -80V, PRF = 10kHz,
f = 10MHz, four pulses, no load,
one channel switching
9
mA
0.6
9
mA
0.6
MIN
TYP
MAX
1
100
FA
200
1
FA
UNITS
MAX4940/MAX4940A
V
EE_
Supply Current
I
EE_
V
PP_
Supply Current
I
PP_
1
FA
V
NN_
Supply Current
I
NN_
LOGIC INPUTS (EN, INN_, INP_, CLP_)
Low-Level Input Voltage
High-Level Input Voltage
Logic-Input Capacitance
Logic-Input Leakage
OUTPUT (OUT_)
No load at OUT_
OUT_ Output-Voltage Range
V
OUT_
100mA load (MAX4940), V
CC
= +12V
Q5%
100mA load (MAX4940A), V
CC
= +12V
Q5%
Low-Side Output Impedance
(MAX4940)
High-Side Output Impedance
(MAX4940)
R
OLS
R
OHS
I
OUT_
= -50mA
I
OUT_
= -50mA
V
CC
= +12V
Q5%
V
CC
= +5V
Q5%
V
CC
= +12V
Q5%
V
CC
= +5V
Q5%
V
NN_
V
NN_
+
1.5
V
NN_
+
2.5
7.5
8
9
10.5
V
PP_
V
PP_
-
1.5
V
PP_
-
2.5
14
18
14
18
V
V
V
I
I
V
IL
V
IH
C
IN
I
IN
V
IN
= 0 or V
DD
0.75 x
V
DD
5
0
Q1
0.25 x
V
DD
V
V
pF
FA
_______________________________________________________________________________________
3
Dual/Quad, Unipolar/Bipolar,
High-Voltage Digital Pulsers
MAX4940/MAX4940A
ELECTRICAL CHARACTERISTICS (continued)
(V
DD
= +3V, V
CC
= +12V, V
EE
= -12V, V
PP_
= +100V, V
NN_
= -100V, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are
at T
A
= +25NC.) (Note 2)
PARAMETER
Low-Side Output Impedance
(MAX4940A)
High-Side Output Impedance
(MAX4940A)
Low-Side Signal CLAMP Output
Impedance
High-Side Signal CLAMP Output
Impedance
PEAK CURRENT
Low-Side Output Current
High-Side Output Current
Low-Side Output Current Clamp
High-Side Output Current Clamp
Off-Output Capacitance
Off-Output Leakage Current
GATE-SOURCE RESISTANCE
Gate-Source Resistance
Logic Input-to-Output Rise
Propagation Delay (Figure 1)
Logic Input-to-Output Fall
Propagation Delay (Figure 1)
Logic Input-to-Output Rise
Propagation Delay Clamp
(Figure 1)
Logic Input-to-Output Fall
Propagation Delay Clamp
(Figure 1)
OUT_ Rise Time (GND to V
PP_
)
(Figure 1)
OUT_ Rise Time (V
NN_
to V
PP_
)
(Figure 1)
OUT_ Fall Time (GND to V
NN_
)
(Figure 1)
OUT_ Fall Time (V
PP_
to V
NN_
)
(Figure 1)
OUT_ Rise Time (V
NN_
to GND)
(Figure 1)
R
GS
V
EN
= V
DD
INN_/INP_ at 50% to OUT_ 10/90%,
V
CC
= +12V, V
PP_
= +5V, V
NN_
= -5V
INN_/INP_ at 50% to OUT_ 10/90%,
V
CC
= +12V, V
PP_
= +5V, V
NN_
= -5V
INN_/INP_ at 50% to OUT_ 10/90%,
V
CC
= +12V, V
PP_
= +5V, V
NN_
= -5V
INN_/INP_ at 50% to OUT_ 10/90%,
V
CC
= +12V, V
PP_
= +5V, V
NN_
= -5V
V
PP_
= +100V, V
NN_
= -100V, 10% to 90%,
V
CC_
= +12V
Q5%,
V
EE_
= -V
CC_
V
PP_
= +100V, V
NN_
= -100V, 10% to 90%,
V
CC_
= +12V
Q5%,
V
EE_
= -V
CC_
V
PP_
= +100V, V
NN_
= -100V, 10% to 90%,
V
CC_
= +12V
Q5%,
V
EE_
= -V
CC_
V
PP_
= +100V, V
NN_
= -100V, 10% to 90%,
V
CC
= +12V
Q5%,
V
EE_
= -V
CC_
V
PP_
= +100V, V
NN_
= -100V, 10% to 90%,
V
CC
= +12V
Q5%,
V
EE_
= -V
CC_
5
7.5
10
kI
DYNAMIC CHARACTERISTICS (R
L
= 100I, C
L
= 100pF, unless otherwise noted)
t
PLH
t
PHL
15
15
ns
ns
I
OL
I
OH
I
OLC
I
OHC
C
O(OFF)
I
LK
V
CC
= +12V
Q5%,
V
OUT_
- V
NN_
= 100V
V
CC
= +12V
Q5%,
V
OUT_
- V
PP_
= 100V
V
CC
= +12V
Q5%,
V
OUT_
= +40V
V
CC
= +12V
Q5%,
V
OUT_
= +40V
MAX4940, MAX4940A (OUT1_)
MAX4940A (OUT2_)
V
NN_
= -100V, V
PP_
= +100V, V
EN
= 0,
V
OUT_
= -100V to +100V
1.3
1.3
0.47
0.47
2.0
2.0
0.9
0.9
75
45
Q1
A
A
A
pF
FA
SYMBOL
R
OLS
R
OHS
R
OLSC
R
OHSC
CONDITIONS
I
OUT_
= -50mA
I
OUT_
= -50mA
I
OUT_
= -50mA
I
OUT_
= -50mA
V
CC
= +12V
Q5%
V
CC
= +5V
Q5%
V
CC
= +12V
Q5%
V
CC
= +5V
Q5%
V
CC
= +12V
Q5%
V
CC
= +5V
Q5%
V
CC
= +12V
Q5%
V
CC
= +5V
Q5%
MIN
TYP
8.5
10.0
11.5
13.0
18.7
20
26.5
37.0
MAX
17
21
17
21
45
60
45
60
UNITS
I
I
I
I
t
PLO
15
ns
t
PHO
15
ns
t
ROP
t
RNP
t
FON
t
FPN
t
RNO
9
10.5
9
10.5
17
20
35
20
35
35
ns
ns
ns
ns
ns
4
______________________________________________________________________________________
Dual/Quad, Unipolar/Bipolar,
High-Voltage Digital Pulsers
ELECTRICAL CHARACTERISTICS (continued)
(V
DD
= +3V, V
CC
= +12V, V
EE
= -12V, V
PP_
= +100V, V
NN_
= -100V, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are
at T
A
= +25NC.) (Note 2)
PARAMETER
OUT_ Fall Time (V
PP_
to GND)
(Figure 1)
Output Enable Time from EN
(Figure 2)
Output Disable Time from EN
(Figure 2)
2nd Harmonic Distortion LV
2nd Harmonic Distortion HV
SYMBOL
t
FPO
t
EN
t
DI
THD2_LV
THD2_HV
CONDITIONS
V
PP_
= +100V, V
NN_
= -100V, 10% to 90%,
V
CC
= +12V
Q5%,
V
EE_
= -V
CC_
V
PP_
= +5V, V
NN_
= -5V
V
PP_
= +5V, V
NN_
= -5V
f
OUT_
= 5MHz, V
PP_
= -V
NN_
= +5V,
V
CC
= +12V
f
OUT_
= 5MHz, V
PP_
= -V
NN_
= +50V, V
CC
= +12V, 10 periods
f
OUT_
= 5MHz, V
PP_
= -V
NN_
= +50V,
V
CC
= +12V, 10 periods, 1st harmonic
cancellation
Adjacent channels, f = 5MHz
-40
-45
MIN
TYP
17
MAX
35
100
150
UNITS
ns
ns
ns
dB
dB
MAX4940/MAX4940A
Pulse Cancellation
RMS Output Jitter
Crosstalk
2HD
t
J
CT
-43
10
-60
dB
ps
dB
Note 2:
Specifications are guaranteed for the stated global conditions, unless otherwise noted. 100% production tested at
T
A
= +70NC. Specifications at T
A
= 0NC are guaranteed by design.
Typical Operating Characteristics
(V
DD
= +3.3V, V
CC
= +12V, V
EE
= -12V, V
PP_
= +100V, V
NN_
= -100V, f
OUT
= 5MHz, R
L
= 100I, C
L
= 100pF, T
A
= +25NC, unless
otherwise noted.)
I
CC
vs. OUTPUT FREQUENCY
MAX4940 toc01
I
CC
vs. OUTPUT FREQUENCY
MAX4940 toc02
0.48
0.46
0.44
I
CC
(mA)
0.42
0.40
0.38
0.36
0.34
0.32
0.30
1
4 PULSES, PRF = 10kHz
RL = 100I
CL = 100pF
35
30
I
CC
(mA)
25
20
15
10
5
0
I
CC
(FA)
CONTINUOUS SWITCHING,
V
PP_
= V
CC
= +5V,
V
NN_
= V
EE
= -5V,
V
DD
= +3.3V
R
L
= 100I
C
L
= 100pF
0.48
0.46
0.44
0.42
0.40
0.38
0.36
0.34
0.32
0.30
4 PULSES AT 10MHz, PRF = 10kHz
3
5
7
9
11
FREQUENCY (MHz)
13
15
1
2
3
4
5
6
7
FREQUENCY (MHz)
8
9
10
0
10
20
30
40
50
TEMPERATURE (NC)
60
70
_______________________________________________________________________________________
MAX4940 toc03
0.50
40
0.50
I
CC
vs. TEMPERATURE
5
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