LTC2249 데이터 시트보기 (PDF) - Linear Technology

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LTC2249

14-Bit, 125/105Msps Low Power 3V ADCs

Linear Technology 

FEATURES

■ Sample Rate: 125Msps/105Msps

■ Single 3V Supply (2.85V to 3.4V)

■ Low Power: 395mW/320mW

■ 72.4dB SNR

■ 88dB SFDR

■ No Missing Codes

■ Flexible Input: 1VP-P to 2VP-P Range

■ 640MHz Full Power Bandwidth S/H

■ Clock Duty Cycle Stabilizer

■ Shutdown and Nap Modes

■ Pin Compatible Family

125Msps: LTC2253 (12-Bit), LTC2255 (14-Bit)

105Msps: LTC2252 (12-Bit), LTC2254 (14-Bit)

80Msps: LTC2229 (12-Bit), LTC2249 (14-Bit)

65Msps: LTC2228 (12-Bit), LTC2248 (14-Bit)

40Msps: LTC2227 (12-Bit), LTC2247 (14-Bit)

25Msps: LTC2226 (12-Bit), LTC2246 (14-Bit)

10Msps: LTC2225 (12-Bit), LTC2245 (14-Bit)

■

32-Pin

(5mm

×

5mm)

U

QFN

Package

APPLICATIO S

■ Wireless and Wired Broadband Communication

■ Imaging Systems

■ Ultrasound

■ Spectral Analysis

■ Portable Instrumentation

LTC2255/LTC2254

14-Bit, 125/105Msps

Low Power 3V ADCs

DESCRIPTIO

The LTC®2255/LTC2254 are 14-bit 125Msps/105Msps,

low power 3V A/D converters designed for digitizing high

frequency, wide dynamic range signals. The LTC2255/

LTC2254 are perfect for demanding imaging and commu-

nications applications with AC performance that includes

72.3dB SNR and 85dB SFDR for signals at the Nyquist

frequency.

DC specs include ±1LSB INL (typ), ±0.5LSB DNL (typ) and

no missing codes over temperature. The transition noise

is a low 1.3 LSBRMS.

A single 3V supply allows low power operation. A separate

output supply allows the outputs to drive 0.5V to 3.3V

logic.

A single-ended CLK input controls converter operation. An

optional clock duty cycle stabilizer allows high perfor-

mance at full speed for a wide range of clock duty cycles.

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

All other trademarks are the property of their respective owners.

TYPICAL APPLICATIO

REFH

REFL

FLEXIBLE

REFERENCE

ANALOG

INPUT

+

INPUT

S/H

–

14-BIT

PIPELINED

ADC CORE

CORRECTION

LOGIC

CLOCK/DUTY

CYCLE

CONTROL

CLK

OUTPUT

DRIVERS

OVDD

D13

•

•

•

D0

OGND

22554 TA01a

LTC2255: SNR vs Input Frequency,

–1dB, 2V Range, 125Msps

75

74

73

72

71

70

69

68

67

66

65

0

50 100 150 200 250 300 350

INPUT FREQUENCY (MHz) 33554 G09

22554fa

1

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