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LTC1090CN

Single Chip 10-Bit Data Acquisition System

Linear Technology 

TYPICAL PERFOR A CE CHARACTERISTICS

Digital Input Logic Threshold vs

Supply Voltage

4

TA = 25°C

3

2

1

0

45

6

7

8

9 10

SUPPLY VOLTAGE, VCC (V)

LTC1090 • TPC19

Input Channel Leakage Current

vs Temperature

1000

900

GUARANTEED

800

700

600

500

400

300

ON CHANNEL

200

OFF CHANNELS

100

–50 –25 0 25 50 75 100 125

AMBIENT TEMPERATURE, TA (°C)

LTC1090 • TPC20

LTC1090

Noise Error vs Reference Voltage

2.0

LTC1090 NOISE = 200µV PEAK-TO-PEAK

1.75

1.5

1.25

1.0

0.75

0.5

0.25

0.2

1

5

REFERENCE VOLTAGE, VREF (V)

LTC1090 • TPC21

APPLICATIO S I FOR ATIO

The LTC1090 is a data acquisition component which

contains the following functional blocks:

1. 10-bit successive approximation capacitive

A/D converter

2. Analog multiplexer (MUX)

3. Sample and hold (S/H)

4. Synchronous, full duplex serial interface

5. Control and timing logic

DIGITAL CONSIDERATIONS

1. Serial Interface

The LTC1090 communicates with microprocessors and

other external circuitry via a synchronous, full duplex,

four wire serial interface (see Operating Sequence). The

shift clock (SCLK) synchronizes the data transfer with

each bit being transmitted on the falling SCLK edge

and captured on the rising SCLK edge in both transmit-

ting and receiving systems. The data is transmitted and

received simultaneously (full duplex).

Operating Sequence

(Example: Differential Inputs (CH3 to CH2), Bipolar, MSB First and 10-Bit Word Length)

1

SCLK

CS

tCYC

5

8

10

DON’T CARE

tSMPL

tCONV

DIN

DOUT

SGL/

DIFF

ODD/

SEL1

SEL0

UNI MSBF WL1

WL0

SIGN

SHIFT CONFIGURATION

WORD IN

DON’T CARE

B9 B8 B7 B6 B5 B4 B3 B2 B1 B0

(SB)

SHIFT A/D RESULT OUT AND

NEW CONFIGURATION WORD IN

LTC1090 • AI01

1090fc

9

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