1

LTC1405

Final Electrical Specifications

Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However,

no responsibility is assumed for its use. Linear Technology Corporation makes no representation that the

interconnection of its circuits as described herein will not infringe on existing patent rights.

12-Bit, 5Msps,

Sampling ADC

January 2000

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 applica-

tions. 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

frequency 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

separate output logic supply allows direct connection to

3V components.

DESCRIPTIO

s

5Msps Sample Rate

s

Low Power Dissipation: 115mW

s

Single 5V Supply or

±5V Supplies

s

Integral Nonlinearity Error <0.35LSB

s

Differential Nonlinearity <0.25LSB

s

71.3dB S/(N + D) and 85dB 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

28-Pin Narrow SSOP Package

s

Pin-Compatible 10Msps Version (LTC1420)

FEATURES

TYPICAL APPLICATIO

s

Telecommunications

s

Digital Signal Processing

s

Multiplexed Data Acquisition Systems

s

High Speed Data Acquisition

s

Spectral Analysis

s

Imaging Systems

APPLICATIO S

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

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

1

µF

1

µF

0V OR –5V

1

µF

1

µF

GAIN

5V

1

µF

5V

1

µF

OGND

OPTIONAL 3V

LOGIC SUPPLY

OF

D11 (MSB)

D0 (LSB)

5MHz CLK

SENSE

+

DGND

AGND

2.048V

2.5V

REFERENCE

PIPELINED 12-BIT ADC