LTC2357CLX-18#PBF

LTC2357CLX-18#PBF is an 18bit, low noise 4-channel simultaneous sampling successive approximation register (SAR) ADC with buffered differential, wide common mode range picoamp inputs. Operating from a 5V low voltage supply, flexible high voltage supplies, and using the internal reference and buffer, each channel of this SoftSpan™ ADC can be independently configured on a conversion-by-conversion basis to accept ±10.24V, 0V to 10.24V, ±5.12V, or 0V to 5.12V signals. Individual channels may also be disabled to increase throughput on the remaining channels. The integrated picoamp-input analogue buffers, wide input common mode range and 128dB CMRR of the device allow the ADC to directly digitize a variety of signals using minimal board space and power. Applications include programmable logic controllers, industrial process control, power line monitoring, test and measurement.

• Simultaneous sampling of 4 buffered channels, rail-to-rail input overdrive tolerance
• Guaranteed 18bit, no missing codes, integrated reference and buffer (4.096V)
• SPI CMOS (1.8V to 5V) and LVDS serial I/O, internal conversion clock, no cycle latency
• Signal-to-noise ratio is 96.4dB typ at (SoftSpans 7 and 6: ±10.24V and ±10V ranges, fIN = 2KHz)
• Total harmonic distortion is -110dB typ at (SoftSpans 7 and 6: ±10.24V and ±10V ranges, fIN = 2KHz)
• 6MHz typical -3dB input bandwidth at (TA = 25°C, AIN = –1dBFS)
• Input common mode rejection ratio is 128dB typ at (TA = 25°C)
• Integral linearity error is ±1LSB typ at (SoftSpans 7 and 6: ±10.24V and ±10V ranges)
• Aperture jitter is 3psRMS typ at (TA = 25°C, AIN = –1dBFS)
• Operating temperature range from 0°C to 70°C, 48-lead plastic LQFP package

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