MAX14800 데이터 시트보기 (PDF) - Maxim Integrated

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MAX14800

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

Maxim Integrated 

Low-Charge Injection, 16-Channel,

High-Voltage Analog Switches

Applications Information

For medical ultrasound applications, see Figures 4, 5,

and 6.

Logic Levels

The MAX14800–MAX14803 digital interface inputs CLK,

DIN, LE, and CLR operate on the VDD supply voltage.

Daisy-Chaining Multiple Devices

Digital output DOUT is provided to allow the connection

of multiple MAX14800–MAX14803 devices by daisy-

chaining (Figure 3). Connect each DOUT to the DIN of

the subsequent device in the chain. Connect CLK, LE,

and CLR inputs of all devices, and drive LE logic-low to

update all devices simultaneously. Drive CLR high to

open all the switches simultaneously. Additional shift

registers can be included anywhere in series with the

MAX14800–MAX14803 data chain.

Supply Sequencing and Bypassing

The MAX14800–MAX14803 do not require special

sequencing of the VDD, VPP, and VNN supply voltages;

however, analog switch inputs must be unconnected,

or satisfy VNN ≤ (VCOM_, VNO_) ≤ VPP during power-up

and power-down. Bypass VDD, VPP, and VNN to GND

with a 0.1µF ceramic capacitor as close as possible to

the device.

Application Diagrams

U10

U11

U1n

DIN1

DIN

DOUT

DIN

DOUT

DIN

DOUT

MAX14800–

MAX14800–

MAX14803

MAX14803

CLK

CLK

CLK

LE

LE

CLR

LE

CLR

MAX14800–

MAX14803

CLK

LE

CLR

CLR

U20

U21

U2n

DIN2

DIN

DOUT

DIN

DOUT

DIN

DOUT

MAX14800–

MAX14803

CLK

LE

CLR

MAX14800–

MAX14803

CLK

LE

CLR

MAX14800–

MAX14803

CLK

LE

CLR

Figure 3. Interfacing Multiple Devices by Daisy-Chaining

12 ______________________________________________________________________________________

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