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LTC1412

12-Bit, 3Msps,

Sampling A/D Converter

The LTC

verter. This high performance device includes a high

dynamic range sample-and-hold and a precision refer-

ence. Operating from

±5V supplies it draws only 150mW.

The

±2.5V input range is optimized for low noise and low

distortion. Most high performance op amps also perform

best over this range, allowing direct coupling to the analog

inputs and eliminating the need for special translation

circuitry. Outstanding AC performance includes 72dB

S/(N + D) and 82dB SFDR at the Nyquist input frequency

of 1.5MHz.

The unique differential input sample-and-hold can acquire

single-ended or differential input signals up to its 40MHz

bandwidth. The 60dB common mode rejection allows

users to eliminate ground loops and common mode noise

by measuring signals differentially from the source.

The ADC has a high speed 12-bit parallel output port. There

is no pipeline delay in the conversion results. A separate

convert start input and converter status signal (BUSY)

ease connections to FIFOs, DSPs and microprocessors. A

digital output driver power supply pin allows direct con-

nection to 3V logic.

FEATURES

12-BIT ADC

12

5V

OPTIONAL

3V LOGIC

SUPPLY

10

µF

OGND

1412 TA01

DGND

D11 (MSB)

D0 (LSB)

BUSY

S/H

BUFFER

LTC1412

4.0625V

2k

–5V

2.5V

REFERENCE

TIMING AND

LOGIC

OUTPUT

BUFFERS

•

•

•

CS

CONVST

AGND

10

µF

10

µF

COMP

–

+

Effective Bits and Signal-to-Noise + Distortion

vs Input Frequency

INPUT FREQUENCY (Hz)

2

4

6

8

10

1k

100k

1M

10M

1412 G01

0

10k

12

62

74

56

68

s

Telecommunications

s

Digital Signal Processing

s

Mulitplexed Data Acquisition Systems

s

High Speed Data Acquisition

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Spectrum Analysis

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Imaging Systems

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

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Sample Rate: 3Msps

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72dB S/(N + D) and 82dB SFDR at Nyquist

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±0.35LSB INL and ±0.25LSB DNL (Typ)

s

Power Dissipation: 150mW

s

External or Internal Reference Operation

s

True Differential Inputs Reject Common Mode Noise

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40MHz Full Power Bandwidth Sampling

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±2.5V Bipolar Input Range

s

No Pipeline Delay

s

28-Pin SSOP Package