LTC2391-16
16-Bit, 250ksps SAR ADC
with 94dB SNR
FeATures
DesCrIPTION
The LTC®2391-16 is a low noise, high speed 16-bit suc-
cessive approximation register (SAR) ADC. Operating
from a single 5V supply, the LTC2391-16 supports a large
±±.ꢀ96V fully differential input range, making it ideal for
high performance applications which require maximum
dynamicrange.TheLTC2391-16achieves±2LSBINLmax,
no missing codes at 16-bits and 9±dB SNR (typ).
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250ksps Throughput Rate
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2ꢀLS ꢁIꢀ ꢂ(aꢃx
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Guaranteed 16-Sit Io (issing Codes
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94dS LIR ꢂTypx at f = 20kHz
ꢁI
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Guaranteed Operation to 125/C
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Single 5V Supply
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1.8V to 5V IꢁO Voltages
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95mW Power Dissipation
The LTC2391-16 includes a precision internal reference
with a guaranteed ꢀ.5% initial accuracy and a ±2ꢀppmꢁ/C
(max) temperature coefficient. Fast 25ꢀksps throughput
with no cycle latency in both parallel and serial interface
modes makes the LTC2391-16 ideally suited for a wide
variety of high speed applications. An internal oscillator
setstheconversiontime,easingexternaltimingconsider-
ations.TheLTC2391-16dissipatesonly95mWat25ꢀksps,
whilebothnapandsleeppower-downmodesareprovided
to further reduce power during inactive periods.
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±±.ꢀ96V Differential Input Range
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Internal Reference (2ꢀppmꢁ/C Max)
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No Pipeline Delay, No Cycle Latency
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Parallel and Serial Interface
Internal Conversion Clock
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±8-Pin 7mm × 7mm LQFP and QFN Packages
APPLICATIONs
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Medical Imaging
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.
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High Speed Data Acquisition
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Digital Signal Processing
Industrial Process Control
Instrumentation
ATE
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TYPICAL APPLICATION
16k Point FFT fL = 250ksps,
fꢁI = 20kHz
5V
5V
0.1µF
1.8V TO 5V
4.7µF
0
–20
SNR = 94dB
10µF
0.1µF
10µF
THD ꢀ –103dB
SINAD = 93.5dB
SFDR = 104dB
–40
ANALOG INPUT
0V TO 4.096V
AVP
DVP
OVP
PARALLEL
OR
SERIAL
INTERFACE
–60
249Ω
16 BIT
+
IN
–80
–100
–120
–140
–160
2200pF
249Ω
LTC2391-16
LT6350
SER/PAR
BYTESWAP
OB/2C
CS
–
IN
RD
SINGLE-ENDED-
TO-DIFFERENTIAL
DRIVER
BUSY
VCM REFIN REFOUT CNVST PD RESET GND OGND
10µF 1µF
–180
239116 TA01
0
100
125
25
50
75
SAMPLE CLOCK
FREQUENCY (kHz)
239116 G08
239116f
ꢀ