LTC2255/LTC2254
14-Bit, 125/105Msps
Low Power 3V ADCs
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FEATURES
DESCRIPTIO
The LTC®2255/LTC2254 are 14-bit 125Msps/105Msps,
low power 3V A/D converters designed for digitizing high
frequency, wide dynamic range signals. The LTC2255/
LTC2254 are perfect for demanding imaging and commu-
nications applications with AC performance that includes
72.3dB SNR and 85dB SFDR for signals at the Nyquist
frequency.
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Sample Rate: 125Msps/105Msps
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Single 3V Supply (2.85V to 3.4V)
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Low Power: 395mW/320mW
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72.4dB SNR
88dB SFDR
No Missing Codes
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■
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Flexible Input: 1VP-P to 2VP-P Range
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640MHz Full Power Bandwidth S/H
DCspecsinclude±1LSBINL(typ), ±0.5LSBDNL(typ)and
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Clock Duty Cycle Stabilizer
no missing codes over temperature. The transition noise
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Shutdown and Nap Modes
is a low 1.3 LSBRMS
.
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Pin Compatible Family
A single 3V supply allows low power operation. A separate
output supply allows the outputs to drive 0.5V to 3.3V
logic.
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)
Asingle-endedCLKinputcontrolsconverteroperation.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.
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32-Pin (5mm × 5mm) QFN Package
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APPLICATIO S
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Wireless and Wired Broadband Communication
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Imaging Systems
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Ultrasound
Spectral Analysis
Portable Instrumentation
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TYPICAL APPLICATIO
LTC2255: SNR vs Input Frequency,
–1dB, 2V Range, 125Msps
75
REFH
FLEXIBLE
REFERENCE
REFL
74
73
72
71
70
69
68
67
66
65
OV
DD
D13
+
14-BIT
PIPELINED
ADC CORE
•
•
•
CORRECTION
LOGIC
ANALOG
INPUT
OUTPUT
DRIVERS
INPUT
S/H
–
D0
OGND
CLOCK/DUTY
CYCLE
CONTROL
0
100 150 200 250 300 350
50
33554 G09
INPUT FREQUENCY (MHz)
22554 TA01a
CLK
22554f
1