 The LTC®2389-18 is a low
noise, high speed 18-bit successive
approximation register (SAR) ADC.
Operating from a single 5V supply, the
LTC2389-18 supports pinconfigurable
fully differential (±4.096V), pseudodifferential
unipolar (0V to 4.096V), and
pseudo-differential bipolar (±2.048V)
analog input ranges, allowing it to
interface with multiple signal chain
formats without requiring additional
level translation or signal conditioning.
The LTC2389-18 achieves ±3LSB INL
(maximum), no missing codes at 18-bits,
and 99.8dB (fully differential)/ 95.2dB
(pseudo differential) SNR (typical).
The LTC2389-18 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 LTC2389-18
ideally suited for a wide variety of high speed applications. An internal oscillator sets the conversion time, easing external timing considerations. The LTC2389-
18 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.
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Features
- 2.5Msps Throughput Rate
- ±3LSB INL (Max)
- Guaranteed 18-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
- 99.8dB (Fully Differential)/95.2dB (Pseudo Differential) SNR (Typ) at fIN = 2kHz
- –116dB (Fully Differential)/–112dB (Pseudo Differential) THD (Typ) at fIN = 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
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Applications
- Medical Imaging
- High Speed, Wide Dynamic Range Data Acquisition
- Industrial Process Control
- Instrumentation
- ATE
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