LTC1414IGN データシートの表示（PDF） - Linear Technology

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LTC1414IGN

14-Bit, 2.2Msps, Sampling A/D Converter

Linear Technology 

LTC1414

14-Bit, 2.2Msps,

Sampling A/D Converter

FEATURES

s Sample Rate: 2.2Msps

s Outstanding Spectral Purity:

80dB S/(N + D) and 95dB SFDR at 100kHz

78dB S/(N + D) and 84dB SFDR at Nyquist

s Ultralow Distortion with Single-Ended or

Differential Inputs

s ±2.5V Bipolar Input Range Eliminates Level Shifting

and Rail-to-Rail Op Amp Requirements

s Easy Hookup for External or Internal Reference

s No Pipeline Delay

s Power Dissipation: 175mW on ±5V Supplies

s 28-Pin Narrow SSOP Package

U

APPLICATIO S

s Telecommunications

s Digital Signal Processing

s Multiplexed Data Acquisition Systems

s High Speed Data Acquisition

s Spectrum Analysis

s Imaging Systems

DESCRIPTIO

The LTC ®1414 is a 14-bit, 2.2Msps, sampling A/D con-

verter which draws only 175mW from ±5V supplies. This

high performance ADC includes a high dynamic range

sample-and-hold, a precision reference and requires no

external components.

The LTC1414’s high performance sample-and-hold has a

full-scale input range of ±2.5V. Outstanding AC perfor-

mance includes 80dB S/(N + D) and 95dB SFDR with a

100kHz input. The performance remains high at the Nyquist

input frequency of 1.1MHz with 78dB S/(N + D) and 84dB

SFDR.

The unique differential input sample-and-hold can acquire

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

bandwidth. The 70dB common mode rejection can elimi-

nate ground loops and common mode noise by measuring

signal differentially from the source

The ADC has a microprocessor compatible, 14-bit parallel

output port. There is no pipline delay in the conversion

results.

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

TYPICAL APPLICATIO

AIN+

AIN–

COMP

10µF

VREF

1µF

LTC1414

5V

10µF

AVDD

DVDD

OPTIONAL 3V

LOGIC SUPPLY

OVDD

S/H

4.0625V

BUFFER

14-BIT ADC

14

OUTPUT

BUFFERS

D13 (MSB)

•

•

•

D0 (LSB)

10µF

2k

2.5V

REFERENCE

VSS

– 5V

AGND

TIMING AND

LOGIC

DGND

OGND

BUSY

CONVST

1414 TA01

Effective Bits and Signal-to-Noise + Distortion

vs Input Frequency

14

86

13

80

12

74

11

68

10

9

8

7

6

5

4

3 fSAMPLE = 2.2MHz

2

1k

10k

100k

1M

INPUT FREQUENCY (Hz)

10M

1414 TA02

1

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