Low-Charge-Injection, 8-Channel, High-Voltage

Analog Switches with 20MHz Serial Interface

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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

+185V/-15V, or +40V/-160V. The digital interface oper-

Digital inputs DIN, CLK, LE, and CLR are +6V tolerant,

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

High-Voltage Supplies

The devices allow a wide range of high-voltage sup-

plies.

The

devices

operate

with

50%

50%

90%

DIN

LE

CLK

DOUT

SWITCH

*FOR SLOWER CLK RATES REFER TO THE MAX4800/MAX4801/MAX4802 DATA SHEET.

CLR

OFF

ON

10%

50%

50%

50%

50%

50%

50%

Figure 1. Serial Interface Timing*