LTC2285
Dual 14-Bit, 125Msps
Low Power 3V ADC
DESCRIPTION
The LTC®2285 is a 14-bit 125Msps, low power dual 3V
A/D converter designed for digitizing high frequency,
wide dynamic range signals. The LTC2285 is perfect for
demanding imaging and communications applications
with AC performance that includes 72.2dB SNR and 82dB
SFDR for signals at the Nyquist frequency.
FEATURES
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Integrated Dual 14-Bit ADCs
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Sample Rate: 125Msps
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Single 3V Supply (2.85V to 3.4V)
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Low Power: 790mW
72.4dB SNR, 88dB SFDR
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11ꢁdB Channel ꢀsolation at 1ꢁꢁMHz
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Flexible ꢀnput: 1V to 2V Range
P-P
P-P
Typical DC specs include 1.5LSB ꢀNL, ꢁ.0LSB DNL. The
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04ꢁMHz Full Power Bandwidth S/H
transition noise is a low 1.3LSB
.
RMS
Clock Duty Cycle Stabilizer
A single 3V supply allows low power operation. A separate
output supply allows the outputs to drive ꢁ.5V to 3.0V
logic.
Shutdown and Nap Modes
Data Ready Output Clock
Pin Compatible Family
125Msps: LTC2283 (12-Bit), LTC2285 (14-Bit)
1ꢁ5Msps: LTC2282 (12-Bit), LTC2284 (14-Bit)
8ꢁMsps: LTC2294 (12-Bit), LTC2299 (14-Bit)
05Msps: LTC2293 (12-Bit), LTC2298 (14-Bit)
4ꢁMsps: LTC2292 (12-Bit), LTC2297 (14-Bit)
04-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.
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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
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ꢀmaging Systems
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Spectral Analysis
Portable ꢀnstrumentation
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TYPICAL APPLICATION
SNR vs Input Frequency,
OV
–1dB, 2V Range
DD
+
14-BꢀT
PꢀPELꢀNED
ADC CORE
ꢀNPUT
S/H
ANALOG
ꢀNPUT A
D13A
75
74
73
72
71
7ꢁ
09
08
07
00
05
OUTPUT
DRꢀVERS
•
•
•
–
DꢁA
OGND
OF
CLOCK/DUTY CYCLE
CONTROL
CLK A
CLK B
MUX
CLOCK/DUTY CYCLE
CONTROL
CLKOUT
OV
DD
ꢁ
1ꢁꢁ 15ꢁ 2ꢁꢁ 25ꢁ 3ꢁꢁ 35ꢁ
5ꢁ
D13B
+
OUTPUT
DRꢀVERS
•
•
•
2285 TAꢁ1b
ꢀNPUT FREQUENCY (MHz)
14-BꢀT
PꢀPELꢀNED
ADC CORE
ANALOG
ꢀNPUT B
ꢀNPUT
S/H
DꢁB
–
OGND
2285 TAꢁ1
2285fb
1