1

LTC1420

12-Bit, 10Msps,

Sampling ADC

The LTC

that draws only 250mW from either single 5V or dual

±5V

supplies. This easy-to-use device includes a high dynamic

range sample-and-hold, a precision reference and a PGA

input circuit.

The LTC1420 has a flexible input circuit that allows full-

scale input ranges of

±2.048V ±1.024V and ±0.512V. The

input common mode voltage is arbitrary, though a 2.5V

reference is provided for single supply applications. The

input PGA has a digitally selectable 1x or 2x gain.

Maximum DC specs include

±1LSB INL and ±1LSB DNL

over temperature. Outstanding AC performance includes

71dB S/(N + D) and 83dB SFDR at the Nyquist input

frequency of 5MHz.

The unique differential input sample-and-hold can acquire

single-ended or differential input signals up to its 100MHz

bandwidth. The 75dB common mode rejection allows

users to eliminate ground loops and common mode noise

by measuring signals differentially from the source. A

separate output logic supply allows direct connection to

3V components.

s

10Msps Sample Rate

s

Single 5V Supply or

s

Integral Nonlinearity Error <0.35LSB

s

Differential Nonlinearity <0.25LSB

s

71dB S/(N + D) and 83dB SFDR at Nyquist

s

100MHz Full-Power Bandwidth Sampling

s

±2.048V, ±1.024V and ±0.512V Bipolar Input Range

s

Input PGA

s

Out-of-Range Indicator

s

True Differential Inputs with 75dB CMRR

s

Power Dissipation: 250mW

s

28-Pin Narrow SSOP Package

s

Telecommunications

s

Digital Signal Processing

s

Multiplexed Data Acquisition Systems

s

High Speed Data Acquisition

s

Spectral Analysis

s

Imaging Systems

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

Typical INL Curve

CODE

0

1024

2048

3072

4096

1420 TA02

1.00

0.75

0.50

0.25

0

–0.25

–0.50

–0.75

–1.00

DIGITAL CORRECTION

LOGIC

OUTPUT

BUFFERS

1420 TA01

MODE SELECT

PIPELINED 12-BIT ADC

S/H

0V OR –5V

GAIN

5V

28

7

23

22

21

OPTIONAL 3V

LOGIC SUPPLY

OF

D11 (MSB)

D0 (LSB)

CLK

27

10

20

26

10MHz CLK

DIGITAL

OUTPUT

SENSE

+

VIN

+

–

3

4

5

2

1

24

8

25

6

OGND

GND

GND

GND

2.048V

2.5V

REFERENCE

1

µF

5V

5V

1

µF

1

µF

1

µF

1

µF

1

µF

FEATURES

DESCRIPTIO

APPLICATIO S

TYPICAL APPLICATIO