LTC2258-12
LTC2257-12/LTC2256-12
12-Bit, 65/40/25Msps
Ultralow Power 1.8V ADCs
FeaTures
DescripTion
The LTC®2258-12/LTC2257-12/LTC2256-12 are sam-
pling 12-bit A/D converters designed for digitizing high
frequency, wide dynamic range signals. They are perfect
for demanding communications applications with AC
performancethatincludes71.1dBSNRand88dBspurious
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71.1dB SNR
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88dB SFDR
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Low Power: 79mW/47mW/34mW
Single 1.8V Supply
CMOS, DDR CMOS or DDR LVDS Outputs
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Selectable Input Ranges: 1V to 2V
free dynamic range (SFDR). Ultralow jitter of 0.17ps
P-P
P-P
RMS
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800MHz Full-Power Bandwidth S/H
Optional Data Output Randomizer
Optional Clock Duty Cycle Stabilizer
Shutdown and Nap Modes
allows undersampling of IF frequencies with excellent
noise performance.
DC specs include 0.3LSB INL (typical), 0.1LSB DNL
(typical) and no missing codes over temperature. The
Serial SPI Port for Configuration
transition noise is a low 0.3LSB
.
RMS
Pin Compatible 14-Bit and 12-Bit Versions
40-Pin (6mm × 6mm) QFN Package
The digital outputs can be either full rate CMOS, double
data rate CMOS, or double data rate LVDS. A separate
output power supply allows the CMOS output swing to
range from 1.2V to 1.8V.
applicaTions
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Communications
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 al-
lows high performance at full speed for a wide range of
clock duty cycles.
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Cellular Base Stations
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Software Defined Radios
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Portable Medical Imaging
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Multi-Channel Data Acquisition
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Nondestructive Testing
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
Typical applicaTion
LTC2258-12 2-Tone FFT,
fIN = 68MHz and 69MHz
1.8V
1.2V
TO 1.8V
V
DD
0
OV
DD
–10
–20
–30
–40
–50
–60
–70
D11
+
–
12-BIT
PIPELINED
ADC CORE
CMOS
OR
LVDS
•
•
•
CORRECTION
LOGIC
ANALOG
INPUT
OUTPUT
DRIVERS
INPUT
S/H
D0
OGND
–80
–90
CLOCK/DUTY
CYCLE
CONTROL
–100
–110
–120
225812 TA01a
GND
0
20
10
FREQUENCY (MHz)
30
65MHz
CLOCK
225812 TA01b
225812fd
1
For more information www.linear.com/LTC2258-12