Linear Technology LTC2412CGN, 2 Channel 24-Bit Differential ADC (req DC590) DC746A DC746A 数据表

LTC2412

1

2412f

The LTC

®

2412 is a 2-channel differential input micropower

24-bit No Latency 

∆Σ

TM

 analog-to-digital converter with

an integrated oscillator. It provides 2ppm INL and 0.16ppm
RMS noise over the entire supply range. The two differen-
tial channels are converted alternately with channel ID
included in the conversion results. It uses delta-sigma
technology and provides single conversion settling of the
digital filter. Through a single pin, the LTC2412 can be
configured for better than 110dB input differential mode
rejection at 50Hz or 60Hz 

±

2%, or it can be driven by an

external oscillator for a user defined rejection frequency.
The internal oscillator requires no external frequency
setting components.

The converter accepts any external differential reference
voltage from 0.1V to V

CC

 for flexible ratiometric and

remote sensing measurement configurations. The full-
scale differential input range is from – 0.5V

REF

 to 0.5V

REF

.

The reference common mode voltage, V

REFCM

, and the

input common mode voltage, V

INCM

, may be indepen-

dently set anywhere within the GND to V

CC

. The DC

common mode input rejection is better than 140dB.

The LTC2412 communicates through a flexible 3-wire
digital interface which is compatible with SPI and
MICROWIRE

TM

 protocols.

■

Direct Sensor Digitizer

■

Weight Scales

■

Direct Temperature Measurement

■

Gas Analyzers

■

Strain-Gage Transducers

■

Instrumentation

■

Data Acquisition

■

Industrial Process Control

■

6-Digit DVMs

, LTC and LT are registered trademarks of Linear Technology Corporation.

■

■

µ

µ

■

■

■

■

■

No Latency: Digital Filter Settles in a Single Cycle and
Each Channel Conversion is Accurate

■

Internal Oscillator—No External Components
Required

■

110dB Min, 50Hz or 60Hz Notch Filter

■

Narrow SSOP-16 Package

■

Single Supply 2.7V to 5.5V Operation

2-Channel Differential Input

24-Bit No Latency 

∆Σ

 ADC

No Latency 

∆Σ

 is a trademark of Linear Technology Corporation.

MICROWIRE is a trademark of National Semiconductor Corporation.

V

CC

REF

+

F

O

CH0

+

CH0

–

SCK

REF

–

CH1

+

SDO

GND

CS

1

14

4

13

3

5

THERMOCOUPLE

6

CH1

–

7

12

8, 9, 10, 15, 16

11

2412 TA01

2

= INTERNAL OSC/50Hz REJECTION
= EXTERNAL CLOCK SOURCE
= INTERNAL OSC/60Hz REJECTION

3-WIRE
SPI INTERFACE

1

µ

F

2.7V TO 5.5V

LTC2412

V

CC

V

IN

 (V)

–1.5

TUE (ppm OF V

REF

)

–0.5

0.5

1.5

–1.0

0

1.0

–1.5

–0.5

0.5

1.5

2412 TA02

2.5

–2

–2.5

–1

0

1

2

T

A

 = 90

°

C

T

A

 = –45

°

C

T

A

 = 25

°

C

V

CC

 = 5V

REF

+

 = 5V

REF

–

 = GND

V

REF

 = 5V

V

INCM

 = 2.5V

F

O

 = GND