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MAX4939CTN Datasheet(PDF) 1 Page - Maxim Integrated Products |
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MAX4939CTN Datasheet(HTML) 1 Page - Maxim Integrated Products |
1 / 19 page _______________________________________________________________ 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 19-5541; Rev 1; 3/11 Ordering Information/Selector Guide 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. 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 SPI is a trademark of Motorola, Inc. +Denotes a lead(Pb)-free/RoHS-compliant package. *EP = Exposed pad. **Future product—contact factory for availability. PART LOW-VOLTAGE ISOLATION HIGH-VOLTAGE PROTECTION OUTPUT CLAMP TEMP RANGE PIN-PACKAGE MAX4936CTN+ Yes Yes Yes 0NC to +70NC 56 TQFN-EP* MAX4937CTN+ No Yes Yes 0NC to +70NC 56 TQFN-EP* MAX4938CTN+** Yes Yes No 0NC to +70NC 56 TQFN-EP* MAX4939CTN+** No Yes No 0NC to +70NC 56 TQFN-EP* |
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