LTC2123_15 Datasheet, PDF (1/50 Pages) Linear Technology – Dual 14-Bit 250Msps ADC with JESD204B Serial Outputs

FEATURES
n _{5Gbps JESD204B Interface}
n _{70dBFS SNR}
n _{90dBFS SFDR}
n _{Low Power: 864mW Total}
n _{Single 1.8V Supply}
n _{Easy to Drive 1.5VP-P Input Range}
n _{1.25GHz Full Power Bandwidth S/H}
n _{Optional Clock Divide by Two}
n _{Optional Clock Duty Cycle Stabilizer}
n _{Low Power Sleep and Nap Modes}
n _{Serial SPI Port for Configuration}
n _{48-Lead (7mm × 7mm) QFN Package}
APPLICATIONS
n _{Communications}
n _{Cellular Base Stations}
n _{Software Defined Radios}
n _{Medical Imaging}
n _{High Definition Video}
n _{Test and Measurement Instrumentation}
LTC2123
Dual 14-Bit 250Msps ADC
with JESD204B Serial Outputs
DESCRIPTION
The LTC^®2123 is a 2-channel simultaneous sampling
250Msps 14-bit A/D converter with serial JESD204B
outputs. It is designed for digitizing high frequency,
wide dynamic range signals. It is perfect for demanding
communications applications with AC performance that
includes 70dBFS SNR and 90dBFS spurious free dynamic
range (SFDR). The 1.25GHz input bandwidth allows the
ADC to under-sample high frequencies.
The 5Gbps JESD204B serial interface simplifies the PCB
design by minimizing the number of data lines required.
The DEVCLK⁺ and DEVCLK^– inputs can be driven differ-
entially with sine wave, PECL, or LVDS signals. An optional
clock divide-by-two circuit or clock duty cycle stabilizer
maintains 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
14-BIT ADC
LTC2123
JESD204B
LOGIC
SERIALIZER
CLOCK
(250MHz OR
500MHz)
ANALOG
INPUT
CLOCK
÷ 2 OR ÷ 1
PLL
14-BIT ADC
JESD204B
LOGIC
SERIALIZER
OV_DD
1.2V TO 1.9V
50Ω 50Ω
5Gbps
OV_DD
1.2V TO 1.9V
JESD204B
FPGA OR ASIC
50Ω 50Ω
5Gbps
2123 TA01a
64k Point 2-Tone FFT,
f_IN = 71.1MHz and 69MHz,
–7dBFS, 250Msps
0
–20
–40
–60
–80
–100
–120
0
20 40 60 80 100 120
FREQUENCY (MHz)
2123 TA01b
For more information www.linear.com/LTC2123
2123fb
1