Datasheet LTC1854, LTC1855, LTC1856 (Analog Devices)

LTC1854/LTC1855/LTC1856 8-Channel, ±10V Input 12-/14-/16-Bit, 100ksps ADC Converters with Shutdown
FeaTures DescripTion
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
±3LSB INL for the LTC1856, ±1.5LSB INL for the
combinations of both. In addition, all channels are fault
LTC1855, ±1LSB INL for the LTC1854
protected to ±30V. A fault condition on any channel will not n
Power Dissipation: 40mW (Typ)
affect the conversion result of the selected channel. 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 40µW 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 5µs maximum conversion
applicaTions
time and the sampling rate is guaranteed at 100ksps. A 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 applicaTion 100kHz, 12-Bit/14-/16-Bit Sampling ADC LTC1856 Typical INL Curve
2.0 COM CONVST CH0 RD LTC1854/ 1.5 CH1 LTC1855/ SCK µP CH2 LTC1856 SDI CONTROL 1.0 SOFTWARE-PROGRAMMABLE CH3 DGND LINES SINGLE-ENDED OR 0.5 CH4 SDO DIFFERENTIAL INPUTS ±10V BIPOLAR INPUT RANGE CH5 BUSY 0 CH6 OVDD 3V TO 5V INL (LSB) –0.5 CH7 DVDD 5V MUXOUT+ AVDD 5V 0.1µF 10µF 10µF 0.1µF 10µF –1.0 MUXOUT– AGND3 0.1µF ADC+ AGND2 –1.5 ADC– REFCOMP –2.0 AGND1 VREF 2.5V –32768 –16384 0 16384 32767 1µF 10µF 0.1µF CODE 185456 G01 1854565af 1 Document Outline Description Typical Application Absolute Maximum Ratings Pin Configuration Typical Performance Characteristics Pin Functions Applications Information Package Description Typical Application Related Parts