LTC2268-12 datasheet(1/36 Pages) LINER

Part #	LTC2268-12

Description	12-Bit, 65Msps/ 40Msps/25Msps Low Power Dual ADCs

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Manufacturer	LINER [Linear Technology]

Direct Link	http://www.linear.com

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Electrical Specifications Subject to Change

1

21421012p

LTC2142-12/

LTC2141-12/LTC2140-12

TYPICAL APPLICATION

FEATURES

APPLICATIONS

DESCRIPTION

12-Bit, 65Msps/

40Msps/25Msps Low Power

Dual ADCs

n Communications

n Cellular Base Stations

n Software Defined Radios

n Portable Medical Imaging

n Multi-Channel Data Acquisition

n Nondestructive Testing

n 2-Channel Simultaneously Sampling ADC

n 70.8dB SNR

n 89dB SFDR

n Low Power: 92mW/65mW/48mW Total

46mW/33mW/24mW per Channel

n Single 1.8V Supply

n CMOS, DDR CMOS, or DDR LVDS Outputs

n Selectable Input Ranges: 1VP-P to 2VP-P

n 800MHz Full Power Bandwidth S/H

n Optional Data Output Randomizer

n Optional Clock Duty Cycle Stabilizer

n Shutdown and Nap Modes

n Serial SPI Port for Configuration

n 64-Pin (9mm

× 9mm) QFN Package

The LTC

®2142-12/LTC2141-12/LTC2140-12 are 2-channel

simultaneous sampling 12-bit A/D converters designed

for digitizing high frequency, wide dynamic range signals.

They are perfect for demanding communications applica-

tions with AC performance that includes 70.8dB SNR and

89dB spurious free dynamic range (SFDR). Ultralow jitter

of 0.08psRMS allows undersampling of IF frequencies with

excellent noise performance.

DC specs include ±0.3LSB INL (typ), ±0.1LSB DNL (typ)

and no missing codes over temperature. The transition

noise is 0.3LSBRMS.

The digital outputs can be either full rate CMOS, double

data rate CMOS, or double data rate LVDS. A separate

output power supply allows the CMOS output swing to

range from 1.2V to 1.8V.

The ENC+ and ENC– inputs may be driven differentially

or single-ended with a sine wave, PECL, LVDS, TTL, or

CMOS inputs. An optional clock duty cycle stabilizer al-

lows high performance at full speed for a wide range of

clock duty cycles.

L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear

Technology Corporation. All other trademarks are the property of their respective owners.

2-Tone FFT, fIN = 70MHz and 69MHz

CMOS

OR

LVDS

OUTPUTS

1.8V

VDD

1.8V

OVDD

CLOCK

CONTROL

D1_11

D1_0

21421012 TA01a

CH 1

ANALOG

INPUT

OUTPUT

DRIVERS

•

GND

OGND

S/H

12-BIT

ADC CORE

CH 2

ANALOG

INPUT

S/H

12-BIT

ADC CORE

D2_11

D2_0

•

65MHz

CLOCK

FREQUENCY (MHz)

–100

–110

–120

–70

–60

–80

–90

–50

–30

–40

–20

–10

0

21821012 TA01b

FREQUENCY (MHz)

21821012 TA01b

0

10

20

30

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