MAX4940, MAX4940A：Dual/Quad, Unipolar/Bipolar, High-Voltage Digital Pulsers

Ideal for High-Voltage Applications Such As Portable Ultrasound Imaging and Industrial Flaw Detection

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. The MAX4940/MAX4940A feature quad, high-voltage pulsers with 8.5Ω output impedance for the high-voltage outputs and a 21Ω 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 control 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 in the full data sheet). The MAX4940/MAX4940A are available in a 56-pin, 8mm x 8mm, TQFN exposed pad package and are specified over the 0°C to +70°C commercial temperature range. Warning: Exercise caution. The MAX4940/MAX4940A are designed to operate with high voltages.

Key Features

High-Density Quad-Channel Pulser in One Package
0 to +220V Unipolar or ±110V Bipolar Outputs
8.5Ω (typ) Output Impedance and 2.0A (typ) Output Current
21Ω (typ) Always-On Active Clamp with Integrated Blocking Diodes
Integrated Output Diodes (MAX4940A Only)
No Special Power-Supply Sequencing Required for Trilevel Applications
Matched Rise/Fall Times and Matched Propagation Delays
CMOS-Compatible Logic Inputs
56-Pin, 8mm x 8mm, TQFN Package

Applications/Uses

Cleaning Equipment
Flaw Detection
Piezoelectric Drivers
Test Instruments
Ultrasound Medical Imaging

DataSheet

title	Download file
MAX4940-MAX4940A Data Sheet	MAX4940-MAX4940A.pdf

Parametrics

Part Number	Functions	Channels	V_SUPPLY (Single) (V)	V_SUPPLY (Single) (V)	C_OFF (pF)	Package/Pins	Budgetary Price
Part Number	Functions	Channels	min	max	C_OFF (pF)	Package/Pins	See Notes
MAX4940	Pulser	4	2.3	6	75	TQFN/56	$14.96 @1k

Design kits & evaluation modules

Quality and Environmental Data

Ordering Information

Part Number	Status	Package	Temp	RoHS
MAX4940ACTN+	Active	TQFN,;56 pin;65.6 mm²	0°C to +70°C	Lead Free
MAX4940ACTN+T	Active	TQFN,;56 pin;65.6 mm²	0°C to +70°C	Lead Free
MAX4940BETN+	No Longer Available	TQFN,;56 pin;65.6 mm²	-40°C to +85°C	Lead Free
MAX4940BETN+T	No Longer Available	TQFN,;56 pin;65.6 mm²	-40°C to +85°C	Lead Free
MAX4940CTN+	Active	TQFN,;56 pin;65.6 mm²	0°C to +70°C	Lead Free
MAX4940CTN+T	Active	QFN;	0°C to +70°C	See data sheet

MAX4940-MAX4940A.pdf MAX4940

MAX4940A.pdf MAX4940

MAX4940.pdf MAX4940