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LTC2224
1
2224fa
FEATURES
DESCRIPTIO
U
TYPICAL APPLICATIO
U
■ Sample Rate: 135Msps
■
67.3dB SNR up to 140MHz Input
■ 80dB SFDR up to 150MHz Input
■ 775MHz Full Power Bandwidth S/H
■
Single 3.3V Supply
■ Low Power Dissipation: 630mW
■ CMOS Outputs
■
Selectable Input Ranges:
±0.5V or ±1V
■ No Missing Codes
■ Optional Clock Duty Cycle Stabilizer
■
Shutdown and Nap Modes
■ Data Ready Output Clock
■ Pin Compatible Family
135Msps: LTC2224 (12-Bit), LTC2234 (10-Bit)
105Msps: LTC2222 (12-Bit), LTC2232 (10-Bit)
80Msps: LTC2223 (12-Bit), LTC2233 (10-Bit)
■
48-Pin 7mm
× 7mm QFN Package
■ Wireless and Wired Broadband Communication
■ Cable Head-End Systems
■
Power Amplifier Linearization
■ Communications Test Equipment
12-Bit, 135Msps ADC
The LTC
2224 is a 135Msps, sampling 12-bit A/D con-
verter designed for digitizing high frequency, wide dy-
namic range signals. The LTC2224 is perfect for demand-
ing communications applications with AC performance
that includes 67.3dB SNR and 80dB spurious free dy-
namic range for signals up to 150MHz. Ultralow jitter of
0.15psRMS allows undersampling of IF frequencies with
excellent noise performance.
DC specs include
±0.4LSB INL (typ), ±0.3LSB DNL (typ)
and no missing codes over temperature. The transition
noise is a low 0.5LSBRMS.
A separate output power supply allows the CMOS output
swing to range from 0.5V to 3.6V.
The ENC+ and ENC– inputs may be driven differentially or
single ended with a sine wave, PECL, LVDS, TTL, or CMOS
inputs. An optional clock duty cycle stabilizer allows high
performance at full speed for a wide range of clock duty
cycles.
0.5V TO 3.6V
OVDD
OGND
–
+
INPUT
S/H
CORRECTION
LOGIC
OUTPUT
DRIVERS
12-BIT
PIPELINED
ADC CORE
CLOCK/DUTY
CYCLE
CONTROL
FLEXIBLE
REFERENCE
D11
D0
ENCODE
INPUT
REFH
REFL
ANALOG
INPUT
2224 TA01
3.3V
VDD
APPLICATIO S
U
SFDR vs Input Frequency
SFDR
(dBFS)
INPUT FREQUENCY (MHz)
0
600
500
400
2224 TA01b
100
200
300
95
90
85
80
75
70
65
60
55
50
4th OR HIGHER
2nd OR 3rd
, LTC and LT are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
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