LTC2353-18 Buffered Dual, 18-Bit, 550ksps/Ch Differential 10.24V ADC with 30V Common Mode Range P-P FEATURES DESCRIPTION n Simultaneous Sampling of 2 Buffered Channels The LTC 2353-18 is an 18-bit, low noise 2-channel n 550ksps per Channel Throughput simultaneous sampling successive approximation regis- n 500pA/12nA Max Input Leakage at 85C/125C ter (SAR) ADC with buffered differential, wide common n 3.5LSB INL (Maximum, 10.24V Range) mode range picoamp inputs. Operating from a 5V low n Guaranteed 18-Bit, No Missing Codes voltage supply, flexible high voltage supplies, and using n Differential, Wide Common Mode Range Inputs the internal reference and buffer, both channels of this TM n Per-Channel SoftSpan Input Ranges: SoftSpan ADC can be independently configured on a n 10.24V, 0V to 10.24V, 5.12V, 0V to 5.12V conversion-by-conversion basis to accept 10.24V, 0V n 12.5V, 0V to 12.5V, 6.25V, 0V to 6.25V to 10.24V, 5.12V, or 0V to 5.12V signals. One channel n 96.4dB Single-Conversion SNR (Typical) may also be disabled to increase throughput on the other n 110dB THD (Typical) at f = 2kHz channel. IN n 124dB CMRR (Typical) at f = 200Hz IN The integrated picoamp-input analog buffers, wide n Rail-to-Rail Input Overdrive Tolerance input common mode range and 124dB CMRR of the n Integrated Reference and Buffer (4.096V) LTC2353-18 allow the ADC to directly digitize a variety n SPI CMOS (1.8V to 5V) and LVDS Serial I/O of signals using minimal board space and power. This n Internal Conversion Clock, No Cycle Latency input signal flexibility, combined with 3.5LSB INL, no n 162mW Power Dissipation (Typical) missing codes at 18 bits, and 96.4dB SNR, makes the n 48-Lead (7mm x 7mm) LQFP Package LTC2353-18 an ideal choice for many high voltage appli- cations requiring wide dynamic range. APPLICATIONS The LTC2353-18 supports pin-selectable SPI CMOS (1.8V to 5V) and LVDS serial interfaces. Either one or two lanes n Programmable Logic Controllers of data output may be employed in CMOS mode, allowing n Industrial Process Control the user to optimize bus width and throughput. n Power Line Monitoring All registered trademarks and trademarks are the property of their respective owners. Protected n Test and Measurement by U.S. Patents, including 7705765, 7961132, 8319673, 9197235. TYPICAL APPLICATION 15V 5V 1.8V TO 5V 0.1F 0.1F 2.2F 0.1F Integral Nonlinearity vs CMOS OR LVDS Output Code and Channel I/O INTERFACE 2.0 V V V OV FULLY CC DD DDLBYP DD LVDS/CMOS 10.24V RANGE ARBITRARY DIFFERENTIAL BUFFERS PD TRUE BIPOLAR DRIVE (IN = 0V) 1.5 +10V +5V ALL CHANNELS + IN0 S/H LTC2353-18 1.0 IN0 0V 0V 0.5 10V 5V SDO0 18-BIT 0 MUX SDO1 SAR ADC TRUE BIPOLAR UNIPOLAR SCKO 0.5 +10V +10V SCKI SDI 1.0 0V 0V + CS IN1 S/H BUSY IN1 10V 10V SAMPLE 1.5 CNV CLOCK + V REFBUF REFIN GND DIFFERENTIAL INPUTS IN /IN WITH EE 2.0 WIDE INPUT COMMON MODE RANGE 235318 TA01a 131072 65536 0 65536 131072 47F 0.1F OUTPUT CODE TWO BUFFERED 0.1F 235318 TA01b SIMULTANEOUS SAMPLING CHANNELS 15V 235318f 1 For more information www.linear.com/LTC2353-18 INL ERROR (LSB)LTC2353-18 ABSOLUTE MAXIMUM RATINGS PIN CONFIGURATION (Notes 1, 2) TOP VIEW Supply Voltage (V ) .....................0.3V to (V + 40V) CC EE Supply Voltage (V ) ................................ 17.4V to 0.3V EE Supply Voltage Difference (V V ) ......................40V CC EE Supply Voltage (V ) ..................................................6V DD Supply Voltage (OV ) ................................................6V DD GND 1 36 GND Internal Regulated Supply Bypass (V ) ... (Note 3) DDLBYP GND 2 35 SDO + IN1 3 34 SDO Analog Input Voltage + IN1 4 33 SCKO /SDO1 + + + IN0 , IN1 , GND 5 32 SCKO /SCKO GND 6 31 OV DD IN0 , IN1 (Note 4) ............(V 0.3V) to (V + 0.3V) EE CC GND 7 30 GND GND 8 29 SCKI /SCKI REFIN .................................................... 0.3V to 2.8V + IN0 9 28 SCKI /SDO0 + IN0 10 27 SDI REFBUF, CNV (Note 5) ............. 0.3V to (V + 0.3V) DD + GND 11 26 SDI Digital Input Voltage (Note 5) ..... 0.3V to (OV + 0.3V) GND 12 25 GND DD Digital Output Voltage (Note 5) .. 0.3V to (OV + 0.3V) DD Power Dissipation .............................................. 500mW Operating Temperature Range LTC2353C ................................................ 0C to 70C LTC2353I .............................................40C to 85C LTC2353H .......................................... 40C to 125C LX PACKAGE 48-LEAD (7mm 7mm) PLASTIC LQFP Storage Temperature Range .................. 65C to 150C T = 150C, = 53C/W JMAX JA