Features
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LTC2389-16
16-Bit, 2.5Msps SAR ADC
with Pin-Configurable Analog
Input Range and 96dB SNR
Description
The LTC
®
2389-16 is a low noise, high speed 16-bit
successive approximation register (SAR) ADC. Operating
from a single 5V supply, the LTC2389-16 supports pin-
configurable fully differential (±4.096V), pseudo-differ-
ential unipolar (0V to 4.096V), and pseudo-differential
bipolar (±2.048V) 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 96.0dB (fully differential)/
93.5dB (pseudo differential) SNR (typical).
The LTC2389-16 includes a precision internal 4.096V
reference, with a guaranteed 0.5% initial accuracy and a
±20ppm/°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
are provided to further reduce power consumption during
inactive periods.
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 7705765.
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2.5Msps Throughput Rate
±1LSB INL (Max)
Guaranteed 16-Bit, No Missing Codes
Pin-Configurable Analog Input Range:
±4.096V Fully Differential
0V to 4.096V Pseudo-Differential Unipolar
±2.048V Pseudo-Differential Bipolar
96.0dB (Fully Differential)/93.5dB (Pseudo
Differential) SNR (Typ) at f
IN
= 2kHz
–116dB (Fully Differential)/–112dB (Pseudo
Differential) THD (Typ) at f
IN
= 2kHz
Guaranteed Operation to 125°C
Single 5V Supply
Internal 20ppm/°C (Max) Reference
Internal Reference Buffer
162.5mW Power Dissipation at 2.5Msps
No Pipeline Delay, No Cycle Latency
1.8V to 5V I/O Voltages
Parallel and Serial I/O Interface
48-pin 7mm
×
7mm LQFP and QFN Packages
Medical Imaging
High Speed, Wide Dynamic Range Data Acquisition
Industrial Process Control
Instrumentation
ATE
applications
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typical application
4.096V
0V
0V
4.096V
0V
4.096V
0V
4.096V
0V
2.048V
10
49.9
1nF
10µF
5V 1.8V TO 5V
0.1µF
V
DD
OV
DD
0.1µF
10µF
32k Point FFT f
SMPL
= 2.5Msps, f
IN
= 2kHz
SNR = 96.0dB
–20 THD = –116dB
SINAD = 96.0dB
–40 SFDR = 117dB
AMPLITUDE (dBFS)
–60
–80
–100
–120
–140
–160
–180
0
250
500
750
1000
1250
238916 TA01b
0
+
–
10
1nF
49.9
PARALLEL OR 16 BIT
SERIAL INTERFACE
A0
A1
IN
+
MODE0
MODE1
LTC2389-16
RESET
PD
CS
OB/2C
IN
–
PD/FD
BUSY
SAMPLE
CNVST
VCM REFOUT REFIN REFSENSE GND
CLOCK
238916 TA01a
10µF
1µF
FREQUENCY (kHz)
238916f
1
LINER [ LINEAR TECHNOLOGY ]
