LTC2155-12_15 Datasheet, PDF (1/32 Pages) Linear Technology – Dual 12-Bit 250Msps/ 210Msps/170Msps ADCs

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 0.54LSB_RMS.
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
V_DD
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
OV_DD
DA10_11
•
•
•
DA0_1
DDR
LVDS
OGND
OV_DD
OUTPUT
DRIVERS
DB10_11
•
•
•
DB0_1
DDR
LVDS
21576512 TA01
OGND
LTC2157-12: 32K Points 2-Tone FFT,
f_IN = 71MHZ and 69MHz, 250Msps
0
–20
–40
–60
–80
–100
–120
0
20 40 60 80 100 120
FREQUENCY (MHz)
21576512 G11
For more information www.linear.com/LTC2157-12
21576512fb
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