LTC2240CUP-12#PBF【PDF 1/30 页】IC ADC 12BIT 170MSPS 64-QFN

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LTC2240-12

224012fd

TYPICAL APPLICATION

FEATURES

APPLICATIONS

DESCRIPTION

12-Bit, 170Msps ADC

The LTC2240-12 is a 170Msps, sampling 12-bit A/D con-

verter designed for digitizing high frequency, wide dynamic

range signals. The LTC2240-12 is perfect for demanding

communications applications with AC performance that

includes 65.6dB SNR and 80dB SFDR. Ultralow jitter of

95fsRMS allows IF undersampling with excellent noise

performance.

DC specs include ±0.6LSB INL (typ), ±0.4LSB DNL (typ)

and no missing codes over temperature.

The digital outputs can be either differential LVDS, or

single-ended CMOS. There are three format options for

the CMOS outputs: a single bus running at the full data

rate or two demultiplexed buses running at half data rate

with either interleaved or simultaneous update. A separate

output power supply allows the CMOS output swing to

range from 0.5V to 2.625V.

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 allows high

performance over a wide range of clock duty cycles.

SFDR vs Input Frequency

n Sample Rate: 170Msps

n 65.6dB SNR

n 80dB SFDR

n 1.2GHz Full Power Bandwidth S/H

n Single 2.5V Supply

n Low Power Dissipation: 445mW

n LVDS, CMOS, or Demultiplexed CMOS Outputs

n Selectable Input Ranges: ±0.5V or ±1V

n No Missing Codes

n Optional Clock Duty Cycle Stabilizer

n Shutdown and Nap Modes

n Data Ready Output Clock

n Pin Compatible Family

250Msps: LTC2242-12 (12-Bit), LTC2242-10 (10-Bit)

210Msps: LTC2241-12 (12-Bit), LTC2241-10 (10-Bit)

170Msps: LTC2240-12 (12-Bit), LTC2240-10 (10-Bit)

185Msps: LTC2220-1 (12-Bit)*

170Msps: LTC2220 (12-Bit), LTC2230 (10-Bit)*

135Msps: LTC2221 (12-Bit), LTC2231 (10-Bit)*

n 64-Pin 9mm

× 9mm QFN Package

n Wireless and Wired Broadband Communication

n Cable Head-End Systems

n Power Amplier Linearization

n Communications Test Equipment

–

INPUT

S/H

CORRECTION

LOGIC

OUTPUT

DRIVERS

12-BIT

PIPELINED

ADC CORE

CLOCK/DUTY

CYCLE

CONTROL

FLEXIBLE

REFERENCE

D11

ENCODE

INPUT

REFH

REFL

ANALOG

INPUT

224012 TA01

CMOS

LVDS

0.5V

TO 2.625V

2.5V

VDD

OVDD

OGND

INPUT FREQUENCY (MHz)

SFDR

(dBFS)

800

224012 G11

200

100

400

300

600 700

900

500

1000

1V RANGE

2V RANGE

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.

*LTC2220-1, LTC2220, LTC2221, LTC2230, LTC2231 are 3.3V parts.

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