Linear Technology LTC2173-12, Руководство пользователя

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21754312fa
LTC2175-12/
LTC2174-12/LTC2173-12
Typical applicaTion
FeaTures
applicaTions
DescripTion
12-Bit, 125Msps/105Msps/
80Msps Low Power Quad ADCs
LTC2175-12, 125Msps,
2-Tone FFT, f
IN
= 70MHz and 75MHz
The LTC
®
2175-12/LTC2174-12/LTC2173-12 are 4-channel,
simultaneous sampling 12-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 70.6dB SNR and
88dB spurious free dynamic range (SFDR). Ultralow jitter
of 0.15ps
RMS
allows undersampling of IF frequencies with
excellent noise performance.
DC specs include ±0.3LSB INL (typ), ±0.1LSB DNL (typ)
and no missing codes over temperature. The transition
noise is a low 0.3LSB
RMS
.
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
70.6dB SNR
n
88dB SFDR
n
Low Power: 545mW/439mW/369mW Total,
136mW/110mW/92mW per Channel
n
Single 1.8V Supply
n
Serial LVDS Outputs: 1 or 2 Bits per Channel
n
Selectable Input Ranges: 1V
P-P
to 2V
P-P
n
800MHz Full Power Bandwidth S/H
n
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
217512 TA01b
DATA
SERIALIZER
ENCODE
INPUT
SERIALIZED
LVDS
OUTPUTS
1.8V
V
DD
1.8V
OV
DD
OUT1A
OUT1B
OUT2A
OUT2B
OUT3A
OUT3B
OUT4A
OUT4B
DATA
CLOCK
OUT
FRAME
OGND GND
217512 TA01
S/H
CHANNEL 1
ANALOG
INPUT
12-BIT
ADC CORE
S/H
CHANNEL 2
ANALOG
INPUT
12-BIT
ADC CORE
S/H
CHANNEL 3
ANALOG
INPUT
12-BIT
ADC CORE
S/H
CHANNEL 4
ANALOG
INPUT
12-BIT
ADC CORE
PLL