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21754314fa
LTC2175-14/
LTC2174-14/LTC2173-14
Typical applicaTion
FeaTures
applicaTions
DescripTion
14-Bit, 125Msps/105Msps/
80Msps Low Power Quad ADCs
LTC2175-14, 125Msps,
2-Tone FFT, fIN = 70MHz and 75MHz
TheLTC2175-14/LTC2174-14/LTC2173-14are4-channel,
simultaneous sampling 14-bit A/D converters designed
for digitizing high frequency, wide dynamic range signals.
They are perfect for demanding communications applica-
tions with AC performance that includes 73.1dB SNR and
88dB spurious free dynamic range (SFDR). Ultralow jitter
of 0.15psRMSallowsundersamplingofIFfrequencieswith
excellent noise performance.
DC specs include ±1LSB INL (typ), ±0.3LSB DNL (typ)
and no missing codes over temperature. The transition
noise is a low 1.2LSBRMS.
The digital outputs are serial LVDS to minimize the num-
ber of data lines. Each channel outputs two bits at a time
(2-lane mode). At lower sampling rates there is a one bit
per channel option (1-lane mode). The LVDS drivers have
optional internal termination and adjustable output levels
to ensure clean signal integrity.
The ENC+ and ENC– inputs may be driven differentially
or single-ended with a sine wave, PECL, LVDS, TTL, or
CMOS inputs. An internal clock duty cycle stabilizer al-
lows high performance at full speed for a wide range of
clock duty cycles.
n
4-Channel Simultaneous Sampling ADC
n
73.1dB SNR
n
88dB SFDR
n
Low Power: 558mW/450mW/376mW Total,
140mW/113mW/94mW per Channel
n
Single 1.8V Supply
n
Serial LVDS Outputs: 1 or 2 Bits per Channel
n
Selectable Input Ranges: 1VP-P to 2VP-P
n
800MHz Full Power Bandwidth S/H
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Shutdown and Nap Modes
n
Serial SPI Port for Configuration
n
Pin Compatible 14-Bit and 12-Bit Versions
n
52-Pin (7mm × 8mm) QFN Package
n
Communications
n
Cellular Base Stations
n
Software Defined Radios
n
Portable Medical Imaging
n
Multichannel Data Acquisition
n
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.
FREQUENCY (MHz)
0
–100
–110
–120
–70
–60
–80
–90
AMPLITUDE
(dBFS) –50
–30
–40
–20
–10
0
10
20
30
40
50
60
217514 TA01b
DATA
SERIALIZER
ENCODE
INPUT
SERIALIZED
LVDS
OUTPUTS
1.8V
VDD
1.8V
OVDD
OUT1A
OUT1B
OUT2A
OUT2B
OUT3A
OUT3B
OUT4A
OUT4B
DATA
CLOCK
OUT
FRAME
OGND
GND
217514 TA01
S/H
CHANNEL 1
ANALOG
INPUT
14-BIT
ADC CORE
S/H
CHANNEL 2
ANALOG
INPUT
14-BIT
ADC CORE
S/H
CHANNEL 3
ANALOG
INPUT
14-BIT
ADC CORE
S/H
CHANNEL 4
ANALOG
INPUT
14-BIT
ADC CORE
PLL
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