LTC2228/LTC2227/LTC2226
12-Bit, 65/40/25Msps
Low Power 3V ADCs
FEATURES
DESCRIPTION
The LTC®2228/LTC2227/LTC2226 are 12-bit 65Msps/
40Msps/25Msps, low power 3V A/D converters designed
for digitizing high frequency, wide dynamic range signals.
The LTC2228/LTC2227/LTC2226 are perfect for demand-
ing imaging and communications applications with AC
performance that includes 71.3dB SNR and 90dB SFDR
for signals at the Nyquist frequency.
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Sample Rate: 65Msps/40Msps/25Msps
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Single 3V Supply (2.7V to 3.4V)
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Low Power: 205mW/120mW/75mW
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71.3dB SNR
90dB SFDR
No Missing Codes
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Flexible ꢀnput: 1V to 2V Range
575MHz Full Power Bandwidth S/H
P-P
P-P
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DC specs include 0.3LSB ꢀNL ꢁtypꢂ, 0.15LSB DNL ꢁtypꢂ
and no missing codes over temperature. The transition
noise is a low 0.25LSB
Clock Duty Cycle Stabilizer
Shutdown and Nap Modes
.
RMS
Pin Compatible Family
A single 3V supply allows low power operation. A separate
output supply allows the outputs to drive 0.5V to 3.6V
logic.
125Msps: LTC2253 ꢁ12-Bitꢂ, LTC2255 ꢁ14-Bitꢂ
105Msps: LTC2252 ꢁ12-Bitꢂ, LTC2254 ꢁ14-Bitꢂ
80Msps: LTC2229 ꢁ12-Bitꢂ, LTC2249 ꢁ14-Bitꢂ
65Msps: LTC2228 ꢁ12-Bitꢂ, LTC2248 ꢁ14-Bitꢂ
40Msps: LTC2227 ꢁ12-Bitꢂ, LTC2247 ꢁ14-Bitꢂ
25Msps: LTC2226 ꢁ12-Bitꢂ, LTC2246 ꢁ14-Bitꢂ
10Msps: LTC2225 ꢁ12-Bitꢂ, LTC2245 ꢁ14-Bitꢂ
32-Pin ꢁ5mm × 5mmꢂ QFN Package
Asingle-endedCLKinputcontrolsconverteroperation.An
optionalclockdutycyclestabilizerallowshighperformance
at full speed for a wide range of clock duty cycles.
L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
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APPLICATIONS
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Wireless and Wired Broadband Communication
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ꢀmaging Systems
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Ultrasound
Spectral Analysis
Portable ꢀnstrumentation
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TYPICAL APPLICATION
LTC2228: SNR vs Input Frequency,
–1dB, 2V Range, 65Msps
72
REFH
FLEXꢀBLE
REFERENCE
REFL
OV
DD
71
70
69
68
D11
+
12-BꢀT
PꢀPELꢀNED
ADC CORE
•
•
•
CORRECTꢀON
LOGꢀC
ANALOG
ꢀNPUT
OUTPUT
DRꢀVERS
ꢀNPUT
S/H
–
D0
OGND
CLOCK/DUTY
CYCLE
CONTROL
0
100
150
200
50
ꢀNPUT FREQUENCY ꢁMHzꢂ
222876 TA01
2228 G09
CLK
222876fb
1