1

LTC1405

1405fa

APPLICATIO S

FEATURES

DESCRIPTIO

12-Bit, 5Msps,

Sampling ADC

The LTC

that draws only 115mW 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 LTC1405 has a flexible input circuit that allows full-scale

input ranges of ±2.048V, ±1.024V and ±0.512V. The input

common mode range is rail-to-rail and a common mode

bias voltage 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

71.3dB S/(N + D) and 85dB SFDR at the Nyquist input fre-

quency of 2.5MHz.

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 sepa-

rate output logic supply allows direct connection to 3V

components.

■

Telecommunications

■

High Speed Data Acquisition

Typical INL Curve

CODE

0

1024

2048

3072

4096

1405 TA02

1.00

0.75

0.50

0.25

0

–0.25

–0.50

–0.75

–1.00

DIGITAL CORRECTION

LOGIC

OUTPUT

BUFFERS

1405 TA01

MODE SELECT

S/H

5V

1µF

1µF

0V OR –5V

1µF

1µF

GAIN

5V

1µF

5V

(PIN 23)

(PIN 7)

1µF

OGND

OPTIONAL 3V

LOGIC SUPPLY

OF

D11 (MSB)

D0 (LSB)

5MHz CLK

SENSE

+

GND

(PIN 6)

GND

(PIN 24)

GND

(PIN 8)

2.048V

2.5V

REFERENCE

PIPELINED 12-BIT ADC

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

All other trademarks are the property of their respective owners.