LTC2389-16
16-Bit, 2.5Msps SAR ADC
with Pin-Configurable Analog
Input Range and 96dB SNR
Features
Description
The LTC®2389-16 is a low noise, high speed 16-bit
successiveapproximationregister(SAR)ADC. Operating
from a single 5V supply, the LTC2389-16 supports pin-
configurable fully differential (±±.ꢀ96V), pseudo-differ-
ential unipolar (ꢀV to ±.ꢀ96V), and pseudo-differential
bipolar (±2.ꢀ±8V) analog input ranges, allowing it to
interface with multiple signal chain formats without re-
quiring additional level translation or signal conditioning.
The LTC2389-16 achieves ±1LSB INL (maximum), no
missing codes at 16-bits, and 96.ꢀdB (fully differential)/
93.5dB (pseudo differential) SNR (typical).
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2.5Msps Throughput Rate
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±±LSB INL (Max)
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Guaranteed ±6-Bit, No Missing Codes
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Pin-Configurable Analog Input Range:
±ꢀ.ꢁ06ꢂ ꢃullꢄ ꢅifferential
ꢁꢂ to ꢀ.ꢁ06ꢂ Pseudo-ꢅifferential Unipolar
±2.ꢁꢀ4ꢂ Pseudo-ꢅifferential Bipolar
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06.ꢁdB (ꢃullꢄ ꢅifferential)/03.5dB (Pseudo
ꢅifferential) SNR (Tꢄp) at f = 2kHz
IN
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–116dB (Fully Differential)/–112dB (Pseudo
Differential) THD (Typ) at f = 2kHz
IN
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Guaranteed Operation to 125ꢁC
The LTC2389-16 includes a precision internal ±.ꢀ96V
reference, with a guaranteed ꢀ.5% initial accuracy and a
±2ꢀppm/ꢁC (maximum) temperature coefficient, as well
as an internal reference buffer. Fast 2.5Msps throughput
with no cycle latency in the parallel interface modes
makes the LTC2389-16 ideally suited for a wide variety
of high speed applications. An internal oscillator sets
the conversion time, easing external timing considera-
tions. The LTC2389-16 dissipates only 162.5mW at
2.5Msps, while both nap and sleep power-down modes
areprovidedtofurtherreducepowerconsumptionduring
inactive periods.
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Single 5V Supply
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Internal 2ꢀppm/ꢁC (Max) Reference
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Internal Reference Buffer
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162.5mW Power Dissipation at 2.5Msps
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No Pipeline Delay, No Cycle Latency
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1.8V to 5V I/O Voltages
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Parallel and Serial I/O Interface
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±8-pin 7mm × 7mm LQFP and QFN Packages
applications
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Medical Imaging
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High Speed, Wide Dynamic Range Data Acquisition
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and
SoftSpan is a trademark of Linear Technology Corporation. All other trademarks are the property
of their respective owners. Protected by U.S. Patents, including 77ꢀ5765.
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Industrial Process Control
Instrumentation
ATE
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typical application
32k Point ꢃꢃT fSMPL = 2.5Msps, fIN = 2kHz
5V 1.8V TO 5V
0
10µF
0.1µF
V
0.1µF
10µF
SNR = 96.0dB
THD = –116dB
SINAD = 96.0dB
4.096V
–20
0V
0V
OV
PARALLEL OR
SERIAL INTERFACE
DD
DD
–40 SFDR = 117dB
16 BIT
A0
–60
–80
10Ω
49.9Ω
1nF
+
A1
IN
IN
4.096V
MODE0
MODE1
RESET
PD
+
–
0V
4.096V
LTC2389-16
–100
–120
–140
–160
–180
CS
1nF
49.9Ω
10Ω
0V
–
OB/2C
PD/FD
BUSY
4.096V
CNVST
SAMPLE
CLOCK
VCM REFOUT REFIN REFSENSE GND
0V
238916 TA01a
0
250
500
750
1000
1250
10µF
2.048V
FREQUENCY (kHz)
238916 TA01b
1µF
238916f
1