LTC2281
Dual 10-Bit, 125Msps
Low Power 3V ADC
FEATURES
DESCRIPTION
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.
n
Integrated Dual 10-Bit ADCs
n
Sample Rate: 125Msps
n
Single 3V Supply (2.85V to 3.4V)
n
Low Power: 790mW
61.6dB SNR, 88dB SFDR
n
n
110dB Channel ꢀsolation at 100MHz
n
Flexible ꢀnput: 1V to 2V Range
P-P
P-P
Typical DC specs include 0.1LSB ꢀNL, 0.1LSB DNL. The
transition noise is a low 0.08LSB
n
n
n
n
n
640MHz Full Power Bandwidth S/H
.
RMS
Clock Duty Cycle Stabilizer
A single 3V supply allows low power operation. A separate
output supply allows the outputs to drive 0.5V to 3.6V
logic.
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
A single-ended CLK input controls converter operation.
An optional clock duty cycle stabilizer allows high perfor-
mance 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.
n
L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other
trademarks are the property of their respective owners.
APPLICATIONS
n
Wireless and Wired Broadband Communication
n
ꢀmaging Systems
n
Spectral Analysis
Portable ꢀnstrumentation
n
TYPICAL APPLICATION
SNR vs Input Frequency,
–1dB, 2V Range
OV
DD
+
10-BꢀT
PꢀPELꢀNED
ADC CORE
ꢀNPUT
S/H
ANALOG
ꢀNPUT A
65
64
63
62
61
60
59
58
57
56
55
D9A
OUTPUT
DRꢀVERS
•
•
•
–
D0A
OGND
OF
CLOCK/DUTY CYCLE
CONTROL
CLK A
CLK B
MUX
CLOCK/DUTY CYCLE
CONTROL
CLKOUT
OV
DD
0
50 100 150 200 250 300 350
D9B
+
2281 TA01b
ꢀNPUT FREQUENCY (MHz)
OUTPUT
DRꢀVERS
•
•
•
10-BꢀT
PꢀPELꢀNED
ADC CORE
ANALOG
ꢀNPUT B
ꢀNPUT
S/H
D0B
–
OGND
2281 TA01
2281fb
1