LTC1854/LTC1855/LTC1856 8-Channel, 10V Input 12-/14-/16-Bit, 100ksps ADC Converters with Shutdown FeaT DescripT n Single 5V Supply The LTC 1854/LTC1855/LTC1856 are 8-channel, low n Sample Rate: 100ksps power, 12-/14-/16-bit, 100ksps, analog-to-digital con- n 8-Channel Multiplexer with 30V Protection verters (ADCs). These ADCs operate from a single 5V n 10V Bipolar Input Range supply and the 8-channel multiplexer can be programmed Single Ended or Differential for single-ended inputs, pairs of differential inputs, or n combinations of both. In addition, all channels are fault 3LSB INL for the LTC1856, 1.5LSB INL for the protected to 30V. A fault condition on any channel will not LTC1855, 1LSB INL for the LTC1854 n affect the conversion result of the selected channel. Power Dissipation: 40mW (Typ) n SPI/MICROWIRE Compatible Serial I/O An onboard precision reference minimizes external com- n Power Shutdown: Nap and Sleep ponents. Power dissipation is 40mW at 100ksps and lower n SINAD: 87dB (LTC1856) in two power shutdown modes (27.5mW in Nap mode and n Operates with Internal or External Reference 40W in Sleep mode.) DC specifications include 3LSB n Internal Synchronized Clock INL for the LTC1856, 1.5LSB INL for the LTC1855 and n 28-Pin SSOP Package 1LSB for the LTC1854. The internal clock is trimmed for 5s maximum conversion time and the sampling rate is guaranteed at 100ksps. A Ta separate convert start input and data ready signal (BUSY) n Industrial Process Control ease connections to FIFOs, DSPs and microprocessors. n Multiplexed Data Acquisition Systems L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. n High Speed Data Acquisition for PCs All other trademarks are the property of their respective owners. n Digital Signal Processing Typical Ta 100kHz, 12-Bit/14-/16-Bit Sampling ADC LTC1856 Typical INL Curve 2.0 COM CONVST 1.5 CH0 RD LTC1854/ CH1 LTC1855/ SCK P 1.0 LTC1856 CONTROL CH2 SDI LINES SOFTWARE-PROGRAMMABLE CH3 DGND 0.5 SINGLE-ENDED OR CH4 SDO DIFFERENTIAL INPUTS 0 CH5 BUSY 10V BIPOLAR INPUT RANGE 3V TO 5V CH6 OV DD 0.5 CH7 DV 5V DD + 5V MUXOUT AV DD 1.0 0.1F 10F 10F 0.1F 10F MUXOUT AGND3 0.1F + 1.5 ADC AGND2 ADC REFCOMP 2.0 AGND1 V 2.5V REF 32768 16384 0 16384 32767 1F 10F 0.1F CODE 185456 G01 1854565af 1 INL (LSB) ion pplica ions pplica ion uresLTC1854/LTC1855/LTC1856 Ta e aximum mTar ackage/orpDer inFT (Notes 1, 2) TOP VIEW Supply Voltage (OV = DV = AV = V ) ............ 6V DD DD DD DD 1 CONVST COM 28 Ground Voltage Difference CH0 2 27 RD 3 SCK CH1 26 DGND, AGND1, AGND2, AGND3 ....................... 0.3V CH2 4 25 SDI Analog Input Voltage CH3 5 24 DGND + ADC , ADC 6 23 SDO CH4 CH5 7 22 BUSY (Note 3) ...................(AGND1 0.3V) to (AV + 0.3V) DD 8 21 OV CH6 DD CH0-CH7, COM ................................................... 30V CH7 9 20 DV DD + Digital Input Voltage (Note 4) ......(DGND 0.3V) to 10V 10 AV MUXOUT 19 DD MUXOUT 11 18 AGND3 Digital Output Voltage ....(DGND 0.3V) to (DV + 0.3V) DD + ADC 12 17 AGND2 Power Dissipation ................................................ 500mW 13 16 REFCOMP ADC Operating Temperature Range AGND1 14 15 V REF LTC1854C/LTC1855C/LTC1856C .............. 0C to 70C G PACKAGE 28-LEAD PLASTIC SSOP LTC1854I/LTC1855I/LTC1856I ............. 40C to 85C T = 125C, = 160C/W JMAX JA EXPOSED PAD (PIN ) IS GND, MUST BE SOLDERED TO PCB Storage Temperature Range ................... 65C to 150C Lead Temperature (Soldering, 10 sec) .................. 300C ORDER PART NUMBER LTC1854CG LTC1855CG LTC1856CG LTC1854IG LTC1855IG LTC1856IG Order Options Tape and Reel: Add TR Lead Free: Add PBF Lead Free Tape and Reel: Add TRPBF Lead Free Part Marking: