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LTC1859CG#PBF
LTC1857/LTC1858/LTC1859 8-Channel, 12-/14-/16-Bit, 100ksps SoftSpan A/D Converters with Shutdown FEATURES DESCRIPTION n n n n The LTC®1857/LTC1858/LTC1859 are 8-channel, low power, 12-/14-/16-bit, 100ksps, analog-to-digital converters (ADCs). These SoftSpan™ ADCs can be softwareprogrammed for 0V to 5V, 0V to 10V, ±5V or ±10V input spans and operate from a single 5V supply. The 8‑channel multiplexer can be programmed for single-ended inputs or pairs of differential inputs or combinations of both. In addition, all channels are fault protected to ±25V. A fault condition on any channel will not affect the conversion result of the selected channel. Sample Rate: 100ksps 8-Channel Multiplexer with ±25V Protection Single 5V Supply Software-Programmable Input Ranges: n 0V to 5V, 0V to 10V, ±5V or ±10V n Single-Ended or Differential ±3LSB INL for the LTC1859, ±1.5LSB INL for the LTC1858, ±1LSB INL for the LTC1857 n Power Dissipation: 40mW (Typ) n SPI/MICROWIRE™ Compatible Serial I/O n Power Shutdown: Nap and Sleep n Signal-to-Noise Ratio: 87dB (Typ) for the LTC1859 n Operates with Internal or External Reference n Internal Synchronized Clock n 28-Pin SSOP Package n APPLICATIONS n n n n An onboard high performance sample-and-hold and precision reference minimize external components. The low 40mW power dissipation is made even more attractive with two user selectable power shutdown modes. DC specifications include ±3LSB INL for the LTC1859, ±1.5LSB INL for the LTC1858 and ±1LSB for the LTC1857. The internal clock is trimmed for 5µs maximum conversion time and the sampling rate is guaranteed at 100ksps. A separate convert start input and data ready signal (BUSY) ease connections to FIFOs, DSPs and microprocessors. Industrial Process Control Multiplexed Data Acquisition Systems High Speed Data Acquisition for PCs Digital Signal Processing L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. SoftSpan is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. TYPICAL APPLICATION 100kHz, 12-Bit/14-Bit/16-Bit Sampling ADC 2.0 1.5 µP CONTROL LINES 1.0 10µF 10µF 3V TO 5V 5V 5V 10µF 2.5V 1µF 10µF INL (LSB) SOFTWARE-PROGRAMMABLE SINGLE-ENDED OR DIFFERENTIAL INPUTS (0V TO 5V, 0V TO 10V, ±5V OR ±10V) COM CONVST CH0 LTC1857/ RD CH1 LTC1858/ SCK CH2 LTC1859 SDI CH3 DGND CH4 SDO CH5 BUSY CH6 OVDD DVDD CH7 AVDD MUXOUT+ MUXOUT– AGND3 ADC+ AGND2 ADC– REFCOMP AGND1 VREF LTC1859 Typical INL Curve 0.5 0 –0.5 –1.0 –1.5 –2.0 –32768 –16384 0 CODE 16384 32767 1859 TA02 185789fb For more information www.linear.com/LTC1857 1
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