LTC2157-14_15 Datasheet, PDF (1/34 Pages) Linear Technology – Dual 14-Bit 250Msps/ 210Msps/170Msps ADCs

FEATURES
n _{70dB SNR}
n _{90dB SFDR}
n _{Low Power: 650mW/616mW/567mW 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 12-Bit Versions}
n _{64-Pin (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}
LTC2157-14/
LTC2156-14/LTC2155-14
Dual 14-Bit 250Msps/
210Msps/170Msps ADCs
DESCRIPTION
The LTC^®2157-14/LTC2156-14/LTC2155-14 are 2-channel
simultaneous sampling 250Msps/210Msps/170Msps
14-bit A/D converters designed for digitizing high fre-
quency, wide dynamic range signals. They are perfect
for demanding communications applications with AC
performance that includes 70dB SNR and 90dB spurious
free dynamic range (SFDR). The 1.25GHz input bandwidth
allows the ADC to undersample high frequencies with
good performance. The latency is only six clock cycles.
DC specs include ±0.85LSB INL (typ), ±0.25LSB DNL (typ)
and no missing codes over temperature. The transition
noise is 1.82LSB_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
14-BIT
PIPELINED
ADC CORE
CORRECTION
LOGIC
CLOCK
CLOCK/DUTY
CYCLE
CONTROL
ANALOG
INPUT
S/H
CHANNEL B
14-BIT
PIPELINED
ADC CORE
CORRECTION
LOGIC
GND
OUTPUT
DRIVERS
OV_DD
DA12_13
•
•
•
DA0_1
DDR
LVDS
OGND
OV_DD
OUTPUT
DRIVERS
DB12_13
•
•
•
DB0_1
DDR
LVDS
21576514 TA01
OGND
LTC2157-14 32K Point FFT,
f_IN = 15MHz, –1dBFS, 250Msps
0
–20
–40
–60
–80
–100
–120
0
20 40 60 80 100 120
FREQUENCY (MHz)
21576514 TA01b
For more information www.linear.com/LTC2157-14
21576514fb
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