LTC2249 Datasheet, PDF (1/20 Pages) Linear Technology – 14-Bit, 80Msps Low Power 3V ADC

FEATURES
■ _{Sample Rate: 80Msps}
■ _{Single 3V Supply (2.7V to 3.4V)}
■ _{Low Power: 222mW}
■ _{73dB SNR at 70MHz Input}
■ _{90dB 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}
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)
■ _{32-Pin (5mm × 5mm) QFN Package}
U
APPLICATIO S
■ _{Wireless and Wired Broadband Communication}
■ _{Imaging Systems}
■ _Ultrasound
■ _{Spectral Analysis}
■ _{Portable Instrumentation}
LTC2249
14-Bit, 80Msps
Low Power 3V ADC
DESCRIPTIO
The LTC^®2249 is a 14-bit 80Msps, low power 3V A/D
converter designed for digitizing high frequency, wide
dynamic range signals. The LTC2249 is perfect for de-
manding imaging and communications applications with
AC performance that includes 73dB SNR and 90dB SFDR
for signals well beyond the Nyquist frequency.
DC specs include ±1LSB INL (typ), ±0.5LSB DNL (typ) and
no missing codes over temperature. The transition noise
is a low 1.2LSB_RMS.
A single 3V supply allows low power operation. A separate
output supply allows the outputs to drive 0.5V to 3.3V
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.
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATIO
REFH
REFL
FLEXIBLE
REFERENCE
ANALOG
INPUT
+
INPUT
S/H
–
14-BIT
PIPELINED
ADC CORE
CLOCK/DUTY
CYCLE
CONTROL
CLK
CORRECTION
LOGIC
OUTPUT
DRIVERS
OV_DD
D13
•
•
•
D0
OGND
2229 TA01
SNR vs Input Frequency,
–1dB, 2V Range
75
74
73
72
71
70
69
68
67
66
65
0
50
100
150
200
INPUT FREQUENCY (MHz)
2249 G09
2249f
1