LTC2281
Dual 10-Bit, 125Msps
Low Power 3V ADC
FEATURES
DESCRIPTION
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The LTC®2281 is a 10-bit 125Msps, low power dual 3V
A/D converter designed for digitizing high frequency,
wide dynamic range signals. The LTC2281 is perfect for
demanding imaging and communications applications
with AC performance that includes 61.6dB SNR and 82dB
SFDR for signals at the Nyquist frequency.
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Integrated Dual 10-Bit ADCs
Sample Rate: 125Msps
Single 3V Supply (2.85V to 3.4V)
Low Power: 790mW
61.6dB SNR, 88dB SFDR
110dB Channel Isolation at 100MHz
Flexible Input: 1VP-P to 2VP-P Range
640MHz Full Power Bandwidth S/H
Clock Duty Cycle Stabilizer
Shutdown and Nap Modes
Data Ready Output Clock
Pin Compatible Family
125Msps: LTC2283 (12-Bit), LTC2281 (10-Bit)
105Msps: LTC2282 (12-Bit), LTC2280 (10-Bit)
80Msps: LTC2294 (12-Bit), LTC2289 (10-Bit)
65Msps: LTC2293 (12-Bit), LTC2288 (10-Bit)
40Msps: LTC2292 (12-Bit), LTC2287 (10-Bit)
64-Pin (9mm × 9mm) QFN Package
Typical DC specs include ±0.1LSB INL, ±0.1LSB DNL. The
transition noise is a low 0.08LSBRMS.
A single 3V supply allows low power operation. A separate
output supply allows the outputs to drive 0.5V to 3.6V
logic.
A single-ended CLK input controls converter operation.
An optional clock duty cycle stabilizer allows high performance at full speed for a wide range of clock duty cycles.
A data ready output clock (CLKOUT) can be used to latch
the output data.
L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other
trademarks are the property of their respective owners.
APPLICATIONS
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Wireless and Wired Broadband Communication
Imaging Systems
Spectral Analysis
Portable Instrumentation
TYPICAL APPLICATION
+
ANALOG
INPUT A
INPUT
S/H
–
SNR vs Input Frequency,
–1dB, 2V Range
OVDD
10-BIT
PIPELINED
ADC CORE
OUTPUT
DRIVERS
D9A
65
•
•
•
64
D0A
63
OGND
CLK B
OF
CLOCK/DUTY CYCLE
CONTROL
CLOCK/DUTY CYCLE
CONTROL
MUX
SNR (dBFS)
CLK A
62
61
60
59
58
CLKOUT
57
56
OVDD
+
ANALOG
INPUT B
INPUT
S/H
–
10-BIT
PIPELINED
ADC CORE
OUTPUT
DRIVERS
D9B
•
•
•
55
0
50
100 150 200 250 300 350
INPUT FREQUENCY (MHz) 2281 TA01b
D0B
OGND
2281 TA01
2281fb
1
