MAX14802ECM 데이터 시트보기 (PDF) - Maxim Integrated

부품명

상세내역

제조사

MAX14802ECM

Low-Charge Injection, 16-Channel, High-Voltage Analog Switches

Maxim Integrated 

MAX14802/MAX14803/MAX14803A

Low-Charge Injection, 16-Channel,

High-Voltage Analog Switches

Detailed Description

The MAX14802/MAX14803/MAX14803A provide high-

voltage switching on 16 channels for ultrasound imag-

ing and printer applications. The devices utilize

HVCMOS process technology to provide 16 high-volt-

age low-charge-injection SPST switches, controlled by

a digital interface. Data is clocked into an internal 16-

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 MAX14802/MAX14803/MAX14803A operate with a

wide range of high-voltage supplies including: VPP/VNN

= +100V/-100V, +200V/0V, or +40V/-160V. The digital

interface operates from a separate +2.7V to +5.5V VDD

supply. Digital inputs DIN, CLK, LE, and CLR operate

on the VDD supply voltage. The MAX14803/MAX14803A

provide integrated 35kΩ bleed resistors on each switch

terminal to discharge capacitive loads. The MAX14802/

MAX14803/MAX14803A feature clamping diodes (at

the COM_). These clamping diodes provide overvolt-

age protection against positive overshoot.

Analog Switch

The MAX14802/MAX14803/MAX14803A allow a peak-to-

peak analog signal range from VNN to the minimum of

either VNN + 200V or (VPP - 10V). Analog switch inputs

must be unconnected, or satisfy VNN ≤ (VCOM_, VNO_) ≤

VPP during power-up and power-down.

High-Voltage Supplies

The MAX14802/MAX14803/MAX14803A allow a wide

range of high-voltage supplies. The devices operate

with VNN from -160V to 0 and VPP from +40V to VNN +

250V. When VNN is connected to GND (single-supply

applications), the devices operate with VPP up to

+200V. The VPP and VNN high-voltage supplies are not

required to be symmetrical, but the voltage difference

(VPP - VNN) must not exceed 250V.

Bleed Resistors (MAX14803/MAX14803A)

The MAX14803/MAX14803A feature integrated 35kΩ

bleed resistors to discharge capacitive loads such as

piezoelectric transducers. Each analog switch terminal

is connected to GND with a bleed resistor.

Overvoltage Protection

The MAX14802/MAX14803/MAX14803A feature clamp-

ing diodes (at the COM_). These clamping diodes pro-

vide overvoltage protection against positive overshoot.

Serial Interface

The MAX14802/MAX14803/MAX14803A are controlled

by a serial interface with a 16-bit serial shift register

and transparent latch. Each of the 16 data bits controls

a single analog switch (Table 1). Data on DIN is

clocked with the most significant bit (MSB) first into the

shift register on the rising edge of CLK. Data is clocked

out of the shift register onto DOUT on the rising edge of

CLK. DOUT reflects the status of DIN, delayed by 16

clock cycles (Figures 1 and 2).

Latch Enable (LE)

Drive LE logic-low to change the contents of the latch

and update the state of the high-voltage switches

(Figure 2). Drive LE logic-high to freeze the contents of

the latch and prevent changes to the switch states. To

reduce noise due to clock feedthrough, drive LE logic-

high while data is clocked into the shift register. After

the data shift register is loaded with valid data, pulse

LE logic-low to load the contents of the shift register

into the latch.

Latch Clear (CLR)

The MAX14802/MAX14803/MAX14803A feature a latch

clear input. Drive CLR logic-high to reset the contents

of the latch to zero and open all switches. CLR does

not affect the contents of the data shift register. Pulse

LE logic-low to reload the contents of the shift register

into the latch.

Power-On Reset

The MAX14802/MAX14803/MAX14803A feature a

power-on-reset circuit to ensure all switches are open

at power-on. The internal 16-bit serial shift register and

latch are set to zero on power-up.

10

Maxim Integrated

Share Link: