LTC2251/LTC2250
10-Bit, 125/105Msps
Low Noise 3V ADCs
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FEATURES
DESCRIPTIO
The LTC®2251/LTC2250 are 10-bit 125Msps/105Msps,
low noise 3V A/D converters designed for digitizing high
frequency, wide dynamic range signals. The LTC2251/
LTC2250 are perfect for demanding imaging and commu-
nications applications with AC performance that includes
61.6dB 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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61.6dB SNR
85dB SFDR
No Missing Codes
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Flexible Input: 1VP-P to 2VP-P Range
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640MHz Full Power Bandwidth S/H
DC specs include ±0.1LSB INL (typ), ±0.05LSB DNL (typ)
and ±0.6LSB INL, ±0.6LSB DNL over temperature. The
transition noise is a low 0.08LSBRMS
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Clock Duty Cycle Stabilizer
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Shutdown and Nap Modes
.
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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: LTC2251 (10-Bit), LTC2253 (12-Bit)
105Msps: LTC2250 (10-Bit), LTC2252 (12-Bit)
80Msps: LTC2239 (10-Bit), LTC2229 (12-Bit)
65Msps: LTC2238 (10-Bit), LTC2228 (12-Bit)
40Msps: LTC2237 (10-Bit), LTC2227 (12-Bit)
25Msps: LTC2236 (10-Bit), LTC2226 (12-Bit)
Asingle-endedCLKinputcontrolsconverteroperation.An
optional clock duty cycle stabilizer allows high perfor-
mance at full speed for a wide range of clock duty cycles.
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32-Pin (5mm × 5mm) QFN Package
, LTC and LT are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
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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
LTC2251: SNR vs Input Frequency,
–1dB, 2V Range, 125Msps
REFH
REFL
FLEXIBLE
REFERENCE
65
64
OV
DD
63
62
61
60
59
58
57
56
55
D9
•
•
•
D0
+
10-BIT
PIPELINED
ADC CORE
CORRECTION
LOGIC
ANALOG
INPUT
OUTPUT
DRIVERS
INPUT
S/H
–
OGND
CLOCK/DUTY
CYCLE
CONTROL
0
100 150 200 250 300 350
50
22510 TA01
22510 G09
INPUT FREQUENCY (MHz)
CLK
22510fa
1