Analog Devices’ LTC2333 is a 16-/18-bit, 8-channel multiplexed successive approximation register (SAR) ADC with buffered differential, wide common mode range picoamp inputs. These ADCs operating from a 5 V low voltage supply, flexible high voltage supplies, and using the internal reference and buffer, this SoftSpan™ ADC can be configured on a conversion-by-conversion basis to accept ±10.24 V, 0 V to 10.24 V, ±5.12 V, or 0 V to 5.12 V signals on any channel. Alternately, the ADC may be programmed to cycle through a sequence of channels and ranges without further user intervention.
The integrated picoamp-input analog buffers, wide input common mode range and 128 dB CMRR of the LTC2333 allow the ADC to directly digitize a variety of signals using minimal board space and power. This input signal flexibility, no missing codes at 16-/18-bits, and 94.2 dB SNR makes this device an ideal choice for many high voltage applications requiring wide dynamic range. The ADC supports pin-selectable SPI CMOS (1.8 V to 5 V) and LVDS serial interfaces. The LTC2333 is ideal for process control, programmable logic controllers, and test/measurement applications.
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Features
- 8 buffered multiplexed channels
- 800 ksps throughput
- 500 pA/12 nA max. input leakage at +85°C/+125°C
- ±1 LSB INL (max. ±10.24 V range) 16-bit
- ±3 LSB INL (max. ±10.24 V range) 18-bit
- Guaranteed 16-/18-bit, no missing codes
- Differential, wide common mode range inputs
- 8-channel multiplexer with SoftSpan input ranges:
- ±10.24 V, 0 V to 10.24 V, ±5.12 V, 0 V to 5.12 V
- ±12.5 V, 0 V to 12.5 V, ±6.25 V, 0 V to 6.25 V
- -110 dB THD (typ.) at fIN = 2 kHz
- 128 dB CMRR, -125 dB active crosstalk (typ.)
- 420 ns step response (full-scale, 0.005% settling)
- Rail-to-rail input overdrive tolerance
- Programmable sequencer with no-latency control
- Integrated reference and buffer (4.096 V)
- SPI CMOS (1.8 V to 5 V) and LVDS serial I/O
- 268 mW power dissipation (typ.)
- 48-lead (7 mm x 7 mm) LQFP package
Applications
- Programable logic controllers
- Test and measurement
- Direct sensor measurement
- Industrial process and control
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Analog Devices’ LTC2333 is a 16-/18-bit, 8-channel multiplexed successive approximation register (SAR) ADC with buffered differential, wide common mode range picoamp inputs. These ADCs operating from a 5 V low voltage supply, flexible high voltage supplies, and using the internal reference and buffer, this SoftSpan™ ADC can be configured on a conversion-by-conversion basis to accept ±10.24 V, 0 V to 10.24 V, ±5.12 V, or 0 V to 5.12 V signals on any channel. Alternately, the ADC may be programmed to cycle through a sequence of channels and ranges without further user intervention.
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