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LTC1856 Dataheets PDF



Part Number LTC1856
Manufacturers Linear Technology
Logo Linear Technology
Description 100ksps ADC Converters
Datasheet LTC1856 DatasheetLTC1856 Datasheet (PDF)

Features n Single 5V Supply n Sample Rate: 100ksps n 8-Channel Multiplexer with ±30V Protection n ±10V Bipolar Input Range Single Ended or Differential n ±3LSB INL for the LTC1856, ±1.5LSB INL for the LTC1855, ±1LSB INL for the LTC1854 n Power Dissipation: 40mW (Typ) n SPI/MICROWIRE™ Compatible Serial I/O n Power Shutdown: Nap and Sleep n SINAD: 87dB (LTC1856) n Operates with Internal or External Reference n Internal Synchronized Clock n 28-Pin SSOP Package Applications n Industri.

  LTC1856   LTC1856


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Features n Single 5V Supply n Sample Rate: 100ksps n 8-Channel Multiplexer with ±30V Protection n ±10V Bipolar Input Range Single Ended or Differential n ±3LSB INL for the LTC1856, ±1.5LSB INL for the LTC1855, ±1LSB INL for the LTC1854 n Power Dissipation: 40mW (Typ) n SPI/MICROWIRE™ Compatible Serial I/O n Power Shutdown: Nap and Sleep n SINAD: 87dB (LTC1856) n Operates with Internal or External Reference n Internal Synchronized Clock n 28-Pin SSOP Package Applications n Industrial Process Control n Multiplexed Data Acquisition Systems n High Speed Data Acquisition for PCs n Digital Signal Processing LTC1854/LTC1855/LTC1856 8-Channel, ±10V Input 12-/14-/16-Bit, 100ksps ADC Converters with Shutdown Description The LTC®1854/LTC1855/LTC1856 are 8-channel, low power, 12-/14-/16-bit, 100ksps, analog-to-digital converters (ADCs). These ADCs operate from a single 5V supply and the 8‑channel multiplexer can be programmed for single-ended inputs, pairs of differential inputs, or combinations of both. In addition, all channels are fault protected to ±30V. A fault condition on any channel will not affect the conversion result of the selected channel. An onboard precision reference minimizes external components. Power dissipation is 40mW at 100ksps and lower in two power shutdown modes (27.5mW in Nap mode and 40µW in Sleep mode.) DC specifications include ±3LSB INL for the LTC1856, ±1.5LSB INL for the LTC1855 and ±1LSB for the LTC1854. 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. L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Typical Application 100kHz, 12-Bit/14-/16-Bit Sampling ADC SOFTWARE-PROGRAMMABLE SINGLE-ENDED OR DIFFERENTIAL INPUTS ±10V BIPOLAR INPUT RANGE COM CONVST CH0 LTC1854/ RD CH1 LTC1855/ SCK CH2 LTC1856 SDI CH3 DGND CH4 SDO CH5 BUSY CH6 OVDD CH7 MUXOUT+ MUXOUT– DVDD AVDD AGND3 ADC+ AGND2 ADC– REFCOMP AGND1 VREF µP CONTROL LINES 0.1µF 10µF 10µF 0.1µF 10µF 1µF 10µF 0.1µF 3V TO 5V 5V 5V 0.1µF 2.5V INL (LSB) LTC1856 Typical INL Curve 2.0 1.5 1.0 0.5 0 –0.5 –1.0 –1.5 –2.0 –32768 –16384 0 CODE 16384 32767 185456 G01 1854565af 1 LTC1854/LTC1855/LTC1856 Absolute Maximum Ratings (Notes 1, 2) Supply Voltage (OVDD = DVDD = AVDD = VDD)............. 6V Ground Voltage Difference DGND, AGND1, AGND2, AGND3........................ ±0.3V Analog Input Voltage ADC+, ADC– (Note 3)....................(AGND1 – 0.3V) to (AVDD + 0.3V) CH0-CH7, COM .................................................... ±30V Digital Input Voltage (Note 4) .......(DGND – 0.3V) to 10V Digital Output Voltage .....(DGND – 0.3V) to (DVDD + 0.3V) Power Dissipation................................................. 500mW Operating Temperature Range LTC1854C/LTC1855C/LTC1856C............... 0°C to 70°C LTC1854I/LTC1855I/LTC1856I.............. – 40°C to 85°C Storage Temperature Range.................... –65°C to 150°C Lead Temperature (Soldering, 10 sec)................... 300°C Package/order information TOP VIEW COM 1 CH0 2 CH1 3 CH2 4 CH3 5 CH4 6 CH5 7 CH6 8 CH7 MUXOUT+ MUXOUT– ADC+ ADC– 9 10 11 12 13 AGND1 14 28 CONVST 27 RD 26 SCK 25 SDI 24 DGND 23 SDO 22 BUSY 21 OVDD 20 DVDD 19 AVDD 18 AGND3 17 AGND2 16 REFCOMP 15 VREF G PACKAGE 28-LEAD PLASTIC SSOP TJMAX = 125°C, θJA = 160°C/W EXPOSED PAD (PIN #) IS GND, MUST BE SOLDERED TO PCB ORDER PART NUMBER LTC1854CG LTC1854IG LTC1855CG LTC1855IG LTC1856CG LTC1856IG Order Options Tape and Reel: Add #TR Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF Lead Free Part Marking: http://www.linear.com/leadfree/ Consult LTC Marketing for parts specified with wider operating temperature ranges. converter and multiplexer characteristics The l denotes the specifications which apply over MUXOUT connected to ADC inputs. (Notes 5, 6) the full operating temperature range, otherwise specifications are at TA = 25°C. PARAMETER Resolution CONDITIONS LTC1854 MIN TYP MAX l 12 LTC1855 MIN TYP MAX 14 LTC1856 MIN TYP MAX 15 UNITS Bits No Missing Codes l 12 14 15 Bits Transition Noise Integral Linearity Error (Note 7) 0.06 l ±1 0.25 ±1.5 1 LSBRMS ±3 LSB Differential Linearity Error l –1 1 –1 1.5 –2 4 LSB Bipolar Zero Error (Note 8) l ±5 ±8 ±23 LSB Bipolar Zero Error Drift ±0.1 ±0.1 ±0.1 ppm/°C Bipolar Zero Error Match 3 4 10 LSB Bipolar Full-Scale Error Bipolar Full-Scale Error Drift Bipolar Full-Scale Error Match External Reference (Note 11) l Internal Reference (Note 11) External Reference Internal Reference ±0.34 ±0.45 ±2.5 ±7 5 ±0.14 ±0.40 ±2.5 ±7 10 ±0.1 % ±0.4 % ±2.5 ppm/°C ±7 ppm/°C 15 LSB Input Common Mode Range l ±10 ±+.


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