Linear Technology Corporation introduces the LTC2338-18, an 18-bit 1 Msps no latency analog-to-digital converter (ADC) with a wide ±10.24 V fully differential, true bipolar input range for high voltage, industrial applications. The device operates from a single 5 V supply, achieves 100 dB SNR and -110 dB THD and features an internal 2.048 V (20 ppm/°C max) reference and reference buffer. An input divider network scales and level shifts the input signal, eliminating complicated circuitry required to directly interface true bipolar signals.
The LTC2338-18 leads a pin- and software-compatible family of 18-bit serial SPI SAR ADCs with speeds ranging from 250 ksps to 1 Msps. A pin-compatible 16-bit and 18-bit family with pseudo differential true bipolar inputs (LTC2328-18) will also be available. The proprietary internal reference buffer maintains less than 1LSB error during sudden burst of conversions, enabling true one-shot operation after lengthy idle periods. These ADCs operate from a single 5 V supply and consume just 50mW at 1Msps. Power further reduces linearly at slower sample rates. A shutdown mode dissipates only 300 μW when idle.
The DC1908A demonstration board enables easy evaluation of the LTC2338 family in conjunction with the DC590B (QuikEval™) or DC718C (PScope™) data collection boards. The fully differential LTC2338-18 and pseudo differential LTC2328-18 families are available in small MSOP-16 packages in commercial, industrial and automotive temperature grades. Pricing begins at $29.10 in 1,000 piece quantities.
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| The DC1908A demonstration board. |
Summary of Features: LTC2338-18
- 1Msps Throughput Rate
- ±4 LSB INL Max
- Fully Differential Inputs
- True Bipolar Input Ranges ±6.25 V, ±10.24 V, ±12.5 V
- 100 dB SNR (Typ) at fIN = 2 kHz
- –110 dB THD (Typ) at fIN = 2 kHz
- Guaranteed Operation to 125 °C
- 5 V Supply
- Low Drift (20 ppm/°C Max) 2.048 V Internal Reference
- Onboard Single-Shot Capable Reference Buffer
- No Pipeline Delay, No Cycle Latency
- 1.8 V to 5 V I/O Voltages
- SPI-Compatible Serial I/O with Daisy-Chain Mode
- Internal Conversion Clock
- Power Dissipation 50 mW (Typ)
- 16-Lead MSOP Package
