LTC2248/LTC2247/LTC2246
14-Bit, 65/40/25Msps
Low Power 3V ADCs
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FEATURES
DESCRIPTIO
The LTC®2248/LTC2247/LTC2246 are 14-bit 65Msps/
40Msps/25Msps, low power 3V A/D converters designed
for digitizing high frequency, wide dynamic range signals.
The LTC2248/LTC2247/LTC2246 are perfect for demand-
ing imaging and communications applications with AC
performance that includes 74.3dB 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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74.3dB SNR
90dB SFDR
No Missing Codes
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■
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Flexible Input: 1VP-P to 2VP-P Range
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575MHz Full Power Bandwidth S/H
DCspecsinclude±1LSBINL(typ), ±0.5LSBDNL(typ)and
no missing codes over temperature. The transition noise
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Clock Duty Cycle Stabilizer
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Shutdown and Nap Modes
is a low 1LSBRMS
.
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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 3.6V
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.
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, LTC and LT are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
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
LTC2248: SNR vs Input Frequency,
–1dB, 2V Range, 65Msps
REFH
FLEXIBLE
REFERENCE
75
REFL
OV
DD
74
73
72
71
70
D13
+
14-BIT
PIPELINED
ADC CORE
•
•
•
CORRECTION
LOGIC
ANALOG
INPUT
OUTPUT
DRIVERS
INPUT
S/H
–
D0
OGND
CLOCK/DUTY
CYCLE
CONTROL
0
50
100
150
200
2249 TA01a
INPUT FREQUENCY (MHZ)
2249 TAO1b
CLK
224876fa
1