LTC2389-16_12 Datasheet, PDF (1/40 Pages) –

LTC2389-16
16-Bit, 2.5Msps SAR ADC
with Pin-Configurable Analog
Input Range and 96dB SNR
Features
Description
n _{2.5Msps Throughput Rate}
n _{±1LSB INL (Max)}
n _{Guaranteed 16-Bit, No Missing Codes}
n _{Pin-Configurable Analog Input Range:}
±4.096V Fully Differential
0V to 4.096V Pseudo-Differential Unipolar
±2.048V Pseudo-Differential Bipolar
n _{96.0dB (Fully Differential)/93.5dB (Pseudo}
Differential) SNR (Typ) at f_IN = 2kHz
n _{–116dB (Fully Differential)/–112dB (Pseudo}
Differential) THD (Typ) at f_IN = 2kHz
n _{Guaranteed Operation to 125°C}
n _{Single 5V Supply}
n _{Internal 20ppm/°C (Max) Reference}
n _{Internal Reference Buffer}
n _{162.5mW Power Dissipation at 2.5Msps}
n _{No Pipeline Delay, No Cycle Latency}
n _{1.8V to 5V I/O Voltages}
n _{Parallel and Serial I/O Interface}
n _{48-pin 7mm × 7mm LQFP and QFN Packages}
Applications
n _{Medical Imaging}
n _{High Speed, Wide Dynamic Range Data Acquisition}
n _{Industrial Process Control}
n _{Instrumentation}
n _ATE
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.
typical application
5V 1.8V TO 5V
4.096V
0V
0V
4.096V
0V
4.096V
0V
4.096V
0V
2.048V
10µF
0.1µF
0.1µF
10µF
V_DD OV_DD
PARALLEL OR
SERIAL INTERFACE
16 BIT
10Ω
49.9Ω _IN+
+
1nF
A0
A1
MODE0
MODE1
LTC2389-16
RESET
–
10Ω
1nF
IN^–
49.9Ω
PD
CS
OB/2C
PD/FD
BUSY
VCM REFOUT REFIN REFSENSE GND
CNVST
SAMPLE
CLOCK
10µF
238916 TA01a
1µF
32k Point FFT f_SMPL = 2.5Msps, f_IN = 2kHz
0
SNR = 96.0dB
–20 ^{THD = –116dB}
SINAD = 96.0dB
–40 SFDR = 117dB
–60
–80
–100
–120
–140
–160
–180
0
250 500 750 1000 1250
FREQUENCY (kHz)
238916 TA01b
238916f
1