1
LTC2239
2239fa
10-Bit, 80Msps
Low Noise 3V ADC
FEATURES
DESCRIPTIO
U
TYPICAL APPLICATIO
U
Sample Rate: 80Msps
Single 3V Supply (2.7V to 3.4V)
Low Power: 211mW
61.6dB SNR at 70MHz Input
85dB SFDR at 70MHz Input
No Missing Codes
Flexible Input: 1VP-P to 2VP-P Range
575MHz Full Power Bandwidth S/H
Clock Duty Cycle Stabilizer
Shutdown and Nap Modes
Pin Compatible Family
125Msps: LTC2253 (12-Bit), LTC2251 (10-Bit)
105Msps: LTC2252 (12-Bit), LTC2250 (10-Bit)
80Msps: LTC2229 (12-Bit), LTC2239 (10-Bit)
65Msps: LTC2228 (12-Bit), LTC2238 (10-Bit)
40Msps: LTC2227 (12-Bit), LTC2237 (10-Bit)
25Msps: LTC2226 (12-Bit), LTC2236 (10-Bit)
10Msps: LTC2225 (12-Bit)
32-Pin (5mm
× 5mm) QFN Package
The LTC
2239 is a 10-bit 80Msps, low power 3V A/D
converter designed for digitizing high frequency, wide
dynamic range signals. The LTC2239 is perfect for de-
manding imaging and communications applications with
AC performance that includes 61.6dB SNR and 85dB
SFDR for signals well beyond the Nyquist frequency.
DC specs include
±0.1LSB INL (typ), ±0.1LSB DNL (typ)
and
±0.5LSB INL, ±0.5LSB DNL over temperature. 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 perfor-
mance at full speed for a wide range of clock duty cycles.
+
INPUT
S/H
CORRECTION
LOGIC
OUTPUT
DRIVERS
10-BIT
PIPELINED
ADC CORE
CLOCK/DUTY
CYCLE
CONTROL
FLEXIBLE
REFERENCE
D9
D0
CLK
REFH
REFL
ANALOG
INPUT
2239 TA01
OVDD
OGND
SNR vs Input Frequency,
–1dB, 2V Range
APPLICATIO S
U
Wireless and Wired Broadband Communication
Imaging Systems
Ultrasound
Spectral Analysis
Portable Instrumentation
INPUT FREQUENCY (MHz)
0
55
SNR
(dBFS)
56
58
59
60
65
62
50
100
2239 G09
57
63
64
61
150
200
, LTC and LT are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
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