LTC2326-18_15 Datasheet, PDF (1/26 Pages) Linear Technology – True Bipolar, Pseudo-Differential Input ADC with 95dB SNR

LTC2326-18
18-Bit, 250ksps, ±10.24V
True Bipolar, Pseudo-Differential
Input ADC with 95dB SNR
Features
Description
n _{250ksps Throughput Rate}
n _{±5LSB INL (Max)}
n _{Guaranteed 18-Bit No Missing Codes}
n _{Pseudo-Differential Inputs}
n _{True Bipolar Input Ranges ±6.25V, ±10.24V, ±12.5V}
n _{95dB SNR (Typ) at fIN = 2kHz}
n _{–111dB THD (Typ) at fIN = 2kHz}
n _{Guaranteed Operation to 125°C}
n _{Single 5V Supply}
n _{Low Drift (20ppm/°C Max) 2.048V Internal Reference}
n _{Onboard Single-Shot Capable Reference Buffer}
n _{No Pipeline Delay, No Cycle Latency}
n _{1.8V to 5V I/O Voltages}
n _{SPI-Compatible Serial I/O with Daisy-Chain Mode}
n _{Internal Conversion Clock}
n _{Power Dissipation 28mW (Typ)}
n _{16-Lead MSOP Package}
Applications
n _{Programmable Logic Controllers}
n _{Industrial Process Control}
n _{High Speed Data Acquisition}
n _{Portable or Compact Instrumentation}
n _ATE
The LTC^®2326-18 is a low noise, high speed 18-bit suc-
cessive approximation register (SAR) ADC with pseudo-
differential inputs. Operating from a single 5V supply,
the LTC2326-18 has a ±10.24V true bipolar input range,
making it ideal for high voltage applications which require
a wide dynamic range. The LTC2326-18 achieves ±5LSB
INL maximum, no missing codes at 18 bits with 95dB SNR.
The LTC2326-18 has an onboard single-shot capable
reference buffer and low drift (20ppm/°C max) 2.048V
temperature compensated reference. The LTC2326-18
also has a high speed SPI-compatible serial interface that
supports 1.8V, 2.5V, 3.3V and 5V logic while also featuring
a daisy-chain mode. The fast 250ksps throughput with
no cycle latency makes the LTC2326-18 ideally suited
for a wide variety of high speed applications. An internal
oscillator sets the conversion time, easing external timing
considerations. The LTC2326-18 dissipates only 28mW
and automatically naps between conversions, leading to
reduced power dissipation that scales with the sampling
rate. A sleep mode is also provided to reduce the power
consumption of the LTC2326-18 to 300μW for further
power savings 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, 7961132.
Typical Application
+10.24V
–10.24V
+
LT^®1468
–
5V
1.8V TO 5V
10µF
2.2µF
0.1µF
V_DD
IN⁺
V_DDLBYP OV_DD
LTC2326-18
IN^–
RERFEBFUF
REFIN GND
47µF
100nF
CHAIN
RDL/SDI
SDO
SCK
BUSY
CNV
232618 TA01
SAMPLE CLOCK
For more information www.linear.com/LTC2326-18
0
–20
–40
–60
–80
–100
–120
–140
–160
–180
0
32k Point FFT f_S = 250ksps,
f_IN = 2kHz
SNR = 95.3dB
THD = –113dB
SINAD = 95.2dB
SFDR = –117dB
25
50
75 100 125
FREQUENCY (kHz)
232618 TA01b
232618fa
1