LTC2253_15 Datasheet, PDF (1/24 Pages) Linear Technology – 12-Bit, 125/105Msps Low Power 3V ADCs

FEATURES
■ _{Sample Rate: 125Msps/105Msps}
■ _{Single 3V Supply (2.85V to 3.4V)}
■ _{Low Power: 395mW/320mW}
■ _{70.2dB SNR}
■ _{88dB SFDR}
■ _{No Missing Codes}
■ _{Flexible Input: 1VP-P to 2VP-P Range}
■ _{640MHz Full Power Bandwidth S/H}
■ _{Clock Duty Cycle Stabilizer}
■ _{Shutdown and Nap Modes}
■ _{Pin Compatible Family}
125Msps: LTC2253 (12-Bit), LTC2255 (14-Bit)
105Msps: LTC2252 (12-Bit), LTC2254 (14-Bit)
80Msps: LTC2229 (12-Bit), LTC2249 (14-Bit)
65Msps: LTC2228 (12-Bit), LTC2248 (14-Bit)
40Msps: LTC2227 (12-Bit), LTC2247 (14-Bit)
25Msps: LTC2226 (12-Bit), LTC2246 (14-Bit)
10Msps: LTC2225 (12-Bit), LTC2245 (14-Bit)
■ _{32-Pin (5mm × 5mm) QFN Package}
U
APPLICATIO S
■ _{Wireless and Wired Broadband Communication}
■ _{Imaging Systems}
■ _Ultrasound
■ _{Spectral Analysis}
■ _{Portable Instrumentation}
LTC2253/LTC2252
12-Bit, 125/105Msps
Low Power 3V ADCs
DESCRIPTIO
The LTC^®2253/LTC2252 are 12-bit 125Msps/105Msps,
low power 3V A/D converters designed for digitizing high
frequency, wide dynamic range signals. The LTC2253/
LTC2252 are perfect for demanding imaging and commu-
nications applications with AC performance that includes
70.1dB SNR and 85dB SFDR for signals at the Nyquist
frequency.
DC specs include ±0.3LSB INL (typ), ±0.15LSB DNL (typ)
and no missing codes over temperature. The transition
noise is a low 0.32LSB_RMS.
A single 3V supply allows low power operation. A separate
output supply allows the outputs to drive 0.5V to 3.3V
logic.
A single-ended CLK input controls converter operation. An
optional clock duty cycle stabilizer allows high perfor-
mance at full speed for a wide range of clock duty cycles.
, LTC and LT are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
TYPICAL APPLICATIO
REFH
REFL
FLEXIBLE
REFERENCE
ANALOG
INPUT
+
INPUT
S/H
–
12-BIT
PIPELINED
ADC CORE
CLOCK/DUTY
CYCLE
CONTROL
CLK
CORRECTION
LOGIC
OUTPUT
DRIVERS
OV_DD
D11
•
•
•
D0
OGND
22532 TA01
LTC2253: SNR vs Input Frequency,
–1dB, 2V Range, 125Msps
73
72
71
70
69
68
67
66
65
0 50 100 150 200 250 300 350
INPUT FREQUENCY (MHz) 22532 G09
22532fa
1