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MAX4800ACQI Datasheet(PDF) 9 Page - Maxim Integrated Products |
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MAX4800ACQI Datasheet(HTML) 9 Page - Maxim Integrated Products |
9 / 15 page Low-Charge-Injection, 8-Channel, High-Voltage Analog Switches with 20MHz Serial Interface _______________________________________________________________________________________ 9 Detailed Description The MAX4800A/MAX4802A provide high-voltage switching on eight channels for ultrasound imaging and printer applications. The devices utilize BCDMOS process technology to provide eight high-voltage low- charge-injection SPST switches, controlled by a 20MHz serial interface. Data is clocked into an internal 8-bit shift register and retained by a programmable latch with enable and clear inputs. A power-on reset function ensures that all switches are open on power-up. The devices operate with a wide range of high-voltage supplies including: VPP/VNN = +100V/-100V, +185V/-15V, or +40V/-160V. The digital interface oper- ates from a separate VDD supply from +2.7V to +6V. Digital inputs DIN, CLK, LE, and CLR are +6V tolerant, independent of the VDD supply voltage. The MAX4802A provides integrated 35k Ω bleed resistors on each switch terminal to discharge capacitive loads. The devices are drop-in replacements for the Supertex HV2203 and HV2303, respectively. Analog Switch The devices allow a peak-to-peak analog-signal range from VNN + 10V to VPP - 10V. Analog switch inputs must be unconnected, or satisfy VNN ≤ (VCOM_, VNO_) ≤ VPP during power-up and power-down. High-Voltage Supplies The devices allow a wide range of high-voltage sup- plies. The devices operate with VNN from -160V to -15V and VPP from +40V to (VNN + 200V). When VNN is connected to GND (single-supply applica- tions), the devices operate with VPP up to +200V. 50% 50% tWC 90% tON DIN LE CLK DOUT SWITCH *FOR SLOWER CLK RATES REFER TO THE MAX4800/MAX4801/MAX4802 DATA SHEET. CLR OFF ON 10% tOFF tDO tDH tDS 50% 50% 50% 50% 50% 50% DN DN-1 DN+1 tWL tCS Figure 1. Serial Interface Timing* |
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