Linear Technology Electronic Components Datasheet

LTC2156CUP-12 Datasheet

Dual 12-Bit 250Msps/210Msps/170Msps ADCs

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FEATURES

n 68.5dB SNR

n 90dB SFDR

n Low Power: 628mW/592mW/545mW Total

n Single 1.8V Supply

n DDR LVDS Outputs

n Easy-to-Drive 1.5VP-P Input Range

n 1.25GHz Full-Power Bandwidth S/H

n Optional Clock Duty Cycle Stabilizer

n Low Power Sleep and Nap Modes

n Serial SPI Port for Configuration

n Pin Compatible 14-Bit Versions

n 64-Lead (9mm × 9mm) QFN Package

APPLICATIONS

n Communications

n Cellular Basestations

n Software Defined Radios

n Medical Imaging

n High Definition Video

n Testing and Measurement Instruments

LTC2157-12/

LTC2156-12/LTC2155-12

Dual 12-Bit 250Msps/

210Msps/170Msps ADCs

DESCRIPTION

The LTC®2157-12/LTC2156-12/LTC2155-12 are a family of

dual 250Msps/210Msps/170Msps 12-bit A/D converters

designed for digitizing high frequency, wide dynamic range

signals. They are perfect for demanding communications

applications with AC performance that includes 68.5dB

SNR and 90dB spurious free dynamic range (SFDR). The

1.25GHz input bandwidth allows the ADC to achieve high

undersampling ratio with very low attenuation. The latency

is only six clock cycles.

DC specs include ±0.26LSB INL (typ), ±0.16LSB DNL (typ)

and no missing codes over temperature. The transition

noise is 0.54LSBRMS.

The digital outputs are double data rate (DDR) LVDS.

The ENC+ and ENC– inputs can be driven differentially with

a sine wave, PECL, LVDS, TTL, or CMOS inputs. An optional

clock duty cycle stabilizer allows 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.

TYPICAL APPLICATION

ANALOG

INPUT

S/H

VDD

CHANNEL A

12-BIT

PIPELINED

ADC CORE

CORRECTION

LOGIC

CLOCK

CLOCK/DUTY

CYCLE

CONTROL

ANALOG

INPUT

S/H

CHANNEL B

12-BIT

PIPELINED

ADC CORE

CORRECTION

LOGIC

GND

OUTPUT

DRIVERS

OVDD

DA10_11

•

DA0_1

DDR

LVDS

OGND

OVDD

OUTPUT

DRIVERS

DB10_11

•

DB0_1

DDR

LVDS

21576512 TA01

OGND

LTC2157-12: 32K Points 2-Tone FFT,

fIN = 71MHZ and 69MHz, 250Msps

–20

–40

–60

–80

–100

–120

20 40 60 80 100 120

FREQUENCY (MHz)

21576512 G11

For more information www.linear.com/LTC2157-12

21576512fb

Linear Technology Electronic Components Datasheet

LTC2156CUP-12 Datasheet

Dual 12-Bit 250Msps/210Msps/170Msps ADCs

No Preview Available !

LTC2157-12/

LTC2156-12/LTC2155-12

ABSOLUTE MAXIMUM RATINGS

(Notes 1, 2)

Supply Voltage

VDD, OVDD................................................. –0.3V to 2V

Analog Input Voltage

AINA/B+, AINA/B–, PAR/SER,

SENSE (Note 3)......................... –0.3V to (VDD + 0.2V)

Digital Input Voltage

ENC+, ENC– (Note 3)................. –0.3V to (VDD + 0.3V)

CS, SDI, SCK (Note 4)............................ –0.3V to 3.9V

SDO (Note 4).............................................. –0.3V to 3.9V

Digital Output Voltage................. –0.3V to (OVDD + 0.3V)

Operating Temperature Range

LTC2157C, LTC2156C, LTC2155C............. 0°C to 70°C

LTC2157I, LTC2156I, LTC2155I.............–40°C to 85°C

Storage Temperature Range................... –65°C to 150°C

PIN CONFIGURATION

TOP VIEW

VDD 1

VDD 2

GND 3

AINA+ 4

AINA– 5

GND 6

SENSE 7

VREF 8

GND 9

GND

VCM 10

GND 11

AINB– 12

AINB+ 13

GND 14

VDD 15

VDD 16

48 OGND

47 DA2_3+

46 DA2_3–

45 DA0_1+

44 DA0_1–

43 NC

42 NC

41 CLKOUT+

40 CLKOUT–

39 DB10_11+

38 DB10_11–

37 DB8_9+

36 DB8_9–

35 DB6_7+

34 DB6_7–

33 OGND

UP PACKAGE

64-LEAD (9mm × 9mm) PLASTIC QFN

TJMAX = 150°C, θJA = 20°C/W

EXPOSED PAD (PIN 65) IS GND, MUST BE SOLDERED TO PCB

ORDER INFORMATION

LEAD FREE FINISH

TAPE AND REEL

PART MARKING*

PACKAGE DESCRIPTION

TEMPERATURE RANGE

LTC2157CUP-12#PBF

LTC2157CUP-12#TRPBF LTC2157UP-12