LTC1859| Datasheet

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LTC1857/LTC1858/LTC1859 8-Channel, 12-/14-/16-Bit, 100ksps SoftSpan A/D Converters with Shutdown FEATURES
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DESCRIPTION
The LTC 1857/LTC1858/LTC1859 are 8-channel, low power, 12-/14-/16-bit, 100ksps, analog-to-digital converters (ADCs). These SoftSpanTM 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. 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 5s maximum conversion time and the sampling rate is guaranteed at 100ksps. A separate convert start input and data ready signal (BUSY) ease connectio
ns to FIFOs, DSPs and microprocessors.
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.

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Sample Rate: 100ksps 8-Channel Multiplexer with 25V Protection Single 5V Supply Software-Programmable Input Ranges: 0V to 5V, 0V to 10V, 5V or 10V Single Ended or Differential 3LSB INL for the LTC1859, 1.5LSB INL for the LTC1858, 1LSB INL for the LTC1857 Power Dissipation: 40mW (Typ) SPI/MICROWIRETM Compatible Serial I/O Power Shutdown: Nap and Sleep Signal-to-Noise Ratio: 87dB (Typ) for the LTC1859 Operates with Internal or External Reference Internal Synchronized Clock 28-Pin SSOP Package

APPLICATIONS
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Industrial Process Control Multiplexed Data Acquisition Systems High Speed Data Acquisition for PCs Digital Signal Processing

TYPICAL APPLICATION
100kHz, 12-Bit/14-Bit/16-Bit Sampling ADC
2.0 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 1.5 P CONTROL LINES INL (LSB) 1.0 0.5 0 0.5 1.0 1.5 2.5V 1F 10F 2.0 32768 16384 0 CODE 16384 32767
1859 TA02

LTC1859 Typical INL Curve

SOFTWARE-PROGRAMMABLE SINGLE-ENDED OR DIFFERENTIAL INPUTS (0V TO 5V, 0V TO 10V, 5V OR 10V)

10F

3V TO 5V 5V 5V 10F

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