EVALUATION KIT AVAILABLE MAX4936A/MAX4937A Octal High-Voltage Transmit/Receive Switches General Description Benefits and Features The MAX4936A/MAX4937A are octal, high-voltage, trans- Save SpaceOptimized for High-Channel-Count mit/receive (T/R) switches. The T/R switches are based Systems on a diode bridge topology, and the amount of current High Density (Eight Transmit/Receive Switches in the diode bridges can be programmed by three digital per Package) inputs (S0, S1, and S2). Two control inputs (EN1 and Two Banks of Four Channels with Independent EN2) allow enabling/disabling channels 14 and channels Enable Control (EN1, EN2) 58, respectively. The MAX4936A includes the T/R switch Low-Capacitance Anti-Parallel Diodes to Be and grass-clipping diodes, performing both transmit and Used as Grass-Clipping or Clamping Diodes receive operations. The MAX4937A includes just the T/R (MAX4936A Only) switch and performs the receive operation only. Small, 42-Pin, 3.5mm x 9mm, TQFN Package These devices feature low on-impedance in the entire Save Power ultrasound frequency range with extremely low power dis- Low 6 (typ) On-Impedance with 1.5mA Bias sipation of 15mW (typ) per channel. Current Only Adjustable Bias Resistors Allow Operation with The receive path for both devices is low impedance Different Voltage Supplies during low-voltage receive and high impedance during high-voltage transmit, providing protection to the receive High PerformanceDesigned to Enhance Image circuitry. The low-voltage receive path is high bandwidth, Quality low noise, low distortion, and low jitter. Low Noise at Low Power Consumption (< 0.5nV/Hz (typ) with 1.5mA Bias Current) The MAX4936A SWC pins can be driven with high- Wide -3dB Bandwidth 100MHz (typ) voltage signals using the anti-parallel diodes as grass clippers while connecting the SWB pins to the low-noise Low-Voltage Receive Path with High-Voltage amplifier (LNA). Connecting SWC to GND allows the Protection internal anti-parallel diodes to be used as clamps. Grass- clipping diodes can then be connected to SWB and the Functional Diagram LNA to SWA see the Applications Information section. V V DD CC Both devices are available in a small, 42-pin, 3.5mm x 9mm TQFN package, and are specified over the com- MAX4936A mercial 0C to +70C temperature range. MAX4937A (SINGLE CHANNEL) (MAX4936A * Applications ONLY) SWC V CC Medical/Industrial Imaging V EE Ultrasound High-Voltage Transmit and Low-Voltage Isolation SWA SWB Ordering Information/Selector Guide appears at end of V data sheet. CC V EE LOGIC GND EN2 EN1 S2 S1 S0 V EE *ANTI-PARALLEL DIODES AVAILABLE ON MAX4936A ONLY. 19-6071 Rev 0 10/11MAX4936A/MAX4937A Octal High-Voltage Transmit/Receive Switches Absolute Maximum Ratings (All voltages referenced to GND unless otherwise noted.) Continuous Current (any other terminal) ........................100mA V Positive Supply Voltage ...................................-0.3V to +6V Peak Current (SWC to SWA ) DD V Positive Supply Voltage ...................................-0.3V to +6V (pulsed at 1ms, 0.1% duty cycle) ...................................2.5A CC V Negative Supply Voltage .................................-6V to +0.3V Continuous Power Dissipation (T = +70C) EE A S0, S1, S2, EN1, EN2 Input Voltage .......................-0.3V to +6V TQFN (single-layer board) SWC Input Voltage ...........................................-120V to +120V (derate 25mW/C above +70C) ...............................2000mW SWA Input/Output Voltage ...............................-120V to +120V TQFN (multilayer board) SWB Input/Output Voltage ...............................-120V to +120V (derate 34.5mW/C above +70C) ............................2758mW Voltage Difference Between SWC and SWA ....................1V Operating Temperature Range ...............................0C to +70C Voltage Difference Across Any or All SWC .....................230V Storage Temperature Range ............................ -65C to +150C Voltage Difference Across Any or All SWA ......................230V Junction Temperature ......................................................+150C Voltage Difference Across Any or All SWB ......................230V Lead Temperature (soldering, 10s) .................................+300C Continuous Current (SWC to SWA ) ...........................250mA Soldering Temperature (reflow) .......................................+260C 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) TQFN Junction-to-Ambient Thermal Resistance ( ) ..........29C/W JA Junction-to-Case Thermal Resistance ( ) .................2C/W JC 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.maximintegrated.com/thermal-tutorial. Electrical Characteristics (V = +1.62V to +5.5V, V = +2.5V to +5.5V, V = -2.5V to -5.5V, T = T to T , unless otherwise noted. Typical values are DD CC EE A MIN MAX at V = +5V, V = -5V, V = +3.3V, T = +25C.) (Note 2) CC EE DD A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS STATIC CHARACTERISTICS SWA , SWB , SWC Input (SWC input voltage range for V -115 +115 V IRSW Voltage Range MAX4936A only) Voltage Difference Across Any or (SWC voltage difference for V 220 V DIFF All SWA , SWB , SWC MAX4936A only) V V V V 2V , I = 100mA SWC SWC SWC SWC SWC SWA Output Voltage Range V V SWA - 1 0.85 + 1 (MAX4936A only) V = +5V, V = -5V, V 2V, CC EE SWB V = 0V, R = 200, SWC L SWA Output Clamp Voltage V -1 0.75 +1 V CLMPSWA C = 30pF, I = 1.5mA L CH (MAX4936A only) (Note 3) SWC to SWA Continuous I V = 0V, (MAX4936A only) -200 +200 mA CN SWA Current V = 0V, I = 2A SWA SWC to SWA Voltage Drop V 2 V CN (MAX4936A only) Maxim Integrated 2 www.maximintegrated.com