LTC2224_15 Datasheet, PDF (1/24 Pages) Linear Technology – 12-Bit, 135Msps ADC

LTC2224
12-Bit, 135Msps ADC
FEATURES
■ _{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}
U
APPLICATIO S
■ _{Wireless and Wired Broadband Communication}
■ _{Cable Head-End Systems}
■ _{Power Amplifier Linearization}
■ _{Communications Test Equipment}
TYPICAL APPLICATIO
3.3V
V_DD
REFH
REFL
FLEXIBLE
REFERENCE
ANALOG
INPUT
+
INPUT
S/H
–
12-BIT
PIPELINED
ADC CORE
CORRECTION
LOGIC
CLOCK/DUTY
CYCLE
CONTROL
ENCODE
INPUT
DESCRIPTIO
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
0.15ps_RMS 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 0.5LSB_RMS.
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.
, LTC and LT are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
OUTPUT
DRIVERS
0.5V TO 3.6V
OV_DD
D11
•
•
•
D0
OGND
2224 TA01
SFDR vs Input Frequency
95
90
4th OR HIGHER
85
80
75
2nd OR 3rd
70
65
60
55
50
0
100 200 300 400 500 600
INPUT FREQUENCY (MHz)
2224 TA01b
2224fa
1