LTC1096AI(RevB) View Datasheet(PDF) - Linear Technology

Part Name

Description

Manufacturer

LTC1096AI
(Rev.:RevB)

Micropower Sampling 8-Bit Serial I/O A/D Converters

Linear Technology 

LTC1096/LTC1096L

LTC1098/LTC1098L

TYPICAL APPLICATI S

Remote or Isolated Systems

Figure 16 shows a floating system that sends data to a

grounded host system. The floating circuitry is isolated by

two optoisolators and powered by a simple capacitor

diode charge pump. The system has very low power

requirements because the LTC1096 shuts down between

conversions and the optoisolators draw power only when

data is being transferred. The system consumes only

50µA at a sample rate of 10Hz (1ms on-time and 99ms off-

time). This is easily within the current supplied by the

charge pump running at 5MHz. If a truly isolated system

is required, the system’s low power simplifies generating

an isolated supply or powering the system from a battery.

0.001µF

2kV

5MHz

300Ω

CLK

10k

DATA 500k

1N5817

1N5817

100k

FLOATING SYSTEM

+

2N3904

47µF

0.1µF

0.022µF

100k

1N5817

VCC VREF

20k

CS

LTC1096

+IN

–IN

CLK

DOUT

GND

ANALOG

INPUT

1k

75k

LT1004-2.5

LTC1096/8 • F16

Figure 16. Power for This Floating A/D System Is Provided by a Simple Capacitor Diode Charge Pump. The Two Optoisolators

Draw No Current Between Samples, Turning On Only to Send the Clock and Receive Data

26

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