LTC2222/LTC2223
12-Bit,105Msps/
80Msps ADCs
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FEATURES
DESCRIPTIO
The LTC®2222 and LTC2223 are 105Msps/80Msps, sam-
pling 12-bit A/D converters designed for digitizing high
frequency, wide dynamic range signals. The LTC2222/
LTC2223 are perfect for demanding communications
applicationswithACperformancethatincludes68dBSNR
and 80dB spurious free dynamic range for signals
up to 170MHz. Ultralow jitter of 0.15psRMS allows
undersampling of IF frequencies with excellent noise
performance.
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Sample Rate: 105Msps/80Msps
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68dB SNR up to 140MHz Input
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80dB SFDR up to 170MHz Input
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775MHz Full Power Bandwidth S/H
■
Single 3.3V Supply
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Low Power Dissipation: 475mW/366mW
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Selectable Input Ranges: ±0.5V or ±1V
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No Missing Codes
■
Optional Clock Duty Cycle Stabilizer
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Shutdown and Nap Modes
DC specs include ±0.3LSB INL (typ), ±0.2LSB DNL (typ)
■
Data Ready Output Clock
and no missing codes over temperature. The transition
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Pin Compatible Family
noise is a low 0.5LSBRMS
.
135Msps: LTC2224 (12-Bit), LTC2234 (10-Bit)
105Msps: LTC2222 (12-Bit), LTC2232 (10-Bit)
80Msps: LTC2223 (12-Bit), LTC2233 (10-Bit)
Aseparateoutputpowersupplyallowstheoutputstodrive
0.5V to 3.6V logic.
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The ENC+ and ENC– inputs may be driven differentially or
singleendedwithasinewave, PECL, LVDS, TTL, orCMOS
inputs. An optional clock duty cycle stabilizer allows high
performance at full speed for a wide range of clock duty
cycles.
48-Pin QFN Package
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APPLICATIO S
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Wireless and Wired Broadband Communication
■
Cable Head-End Systems
■
Power Amplifier Linearization
Communications Test Equipment
, LTC and LT are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
■
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TYPICAL APPLICATIO
V
DD
3.3V
SFDR vs Input Frequency
100
REFH
REFL
FLEXIBLE
95
REFERENCE
4th OR HIGHER
0V
DD
90
85
80
75
70
65
60
0.5V TO 3.6V
D11
+
12-BIT
PIPELINED
ADC CORE
•
•
•
CORRECTION
LOGIC
ANALOG
INPUT
OUTPUT
DRIVERS
INPUT
S/H
2nd or 3rd
–
D0
0GND
CLOCK/DUTY
CYCLE
CONTROL
0
200
300
400
500
22223 TA01b
600
100
INPUT FREQUENCY (MHz)
22201 TA01
ENCODE
INPUT
22223fa
1