HV2818/HV2918 No High-Voltage Bias, Low Harmonic Distortion, 32-Channel, High-Voltage Analog Switch Features General Description 32-Channel (16 2:1 MUX) High-Voltage Analog The HV2818/HV2918 devices are low harmonic Switch distortion, low charge injection, 16 2:1 multi- plexer/demultiplexer, high-voltage analog switches Only +5V Bias Supply Required without high-voltage bias supplies. They are intended 3.3V and 5V CMOS Input Logic Level for use in applications requiring high-voltage switching Asymmetric Switch Topology for Small Size controlled by low-voltage control signals, such as med- 66 MHz Data Shift Clock Frequency ical ultrasound imaging, driving piezoelectric Low-Parasitic Capacitance transducers and printers. Low Harmonic Distortion The HV2818/HV2918 are pin-to-pin compatible to DC to 50 MHz Analog Small-Signal Frequency high-voltage bias HV2801/HV2901, except for bias voltage pins. The HV2818/HV2918 are available in a 200 kHz to 50 MHz Large Signal Frequency 64-pin, 9x9mm QFN package. The devices have -70 dB Typical Off Isolation at 5.0 MHz asymmetric topology to implement a small size in low Excellent Noise Immunity voltage bias high-voltage switches while keeping per- Cascadable Serial Data Register with Latches formance such as peak current. The SW pin can pass Integrated Bleed Resistors on the SW Outputs high-voltage pulsed signals when the switch is ON. (HV2918 only) During the OFF state, high-voltage must not be applied to the SW pin due to its asymmetric topology. Applications In medical ultrasound systems, the Y pin must be con- nected to the analog front end (AFE) and the SW pin Medical Ultrasound Imaging must be connected to a single piezoelectric transducer Non-Destructive Testing (NDT) Metal Flaw element to avoid high voltage in the SW pin during the Detection switch OFF state. Piezoelectric Transducer Drivers HV2818 and HV2918 are identical, except for the Inkjet Printer Head bleed resistors at the SW pins. HV2818 does not have Optical MEMS Modules the bleed resistors at the SW pins like HV2801. HV2918 has the bleed resistors at the SW pins like HV2901. The bleed resistors eliminate possible volt- age build-up on capacitive loads such as piezoelectric transducers. The ON/OFF state of the 32 switches is programmed individually through a digital serial interface. The devices only need a +5V low-voltage bias supply. However, all of the analog switches can pass up to 100V high-voltage pulsed signals. Like other low-volt- age bias switches, the HV2818/HV2918 cannot pass high-voltage DC signals. They can only pass high- voltage pulsed signals up to 2.5 s pulse width. These devices have typical 6 ON resistance and 50 MHz bandwidth for small signals. 2020-2021 Microchip Technology Inc. DS20006375B-page 1HV2818/HV2918 Package Type HV2818/HV2918 9 x 9 x 0.9 mm VQFN (TOP VIEW) 64 1 EP *Includes Exposed Thermal Pad (EP) see Table 2-1. Functional Block Diagram Bleed Level Output Switches Shifters Resistors Latches D SW0 LE CLR Y01 D LE CLR SW1 D SW2 LE CLR CLK Y23 D LE CLR 32-Bit SW3 D IN Shift Register D OUT D SW30 LE CLR Y3031 D LE CLR SW31 R V GND GND V DD LL DGND LE CLR HV2918 has bleed resistor at SWx pins DS20006375B-page 2 2020-2021 Microchip Technology Inc.