LTC2321-16 Dual, 16-Bit, 2Msps Differential Input ADC with Wide Input Common Mode Range FEATURES DESCRIPTION n 2Msps Throughput Rate The LTC 2321-16 is a low noise, high speed dual 16-bit n 4LSB INL (Typ) successive approximation register (SAR) ADC with n Guaranteed 16-Bit, No Missing Codes differential inputs and wide input common mode range. n 8V Differential Inputs with Wide Input Common Operating from a single 3.3V or 5V supply, the LTC2321- P-P Mode Range 16 has an 8V differential input range, making it ideal P-P n 81dB SNR (Typ) at f = 500kHz for applications which require a wide dynamic range with IN n 90dB THD (Typ) at f = 500kHz high common mode rejection. The LTC2321-16 achieves IN n No Cycle Latency 4LSB INL typical, no missing codes at 16 bits and 81dB n Guaranteed Operation to 125C SNR. n Single 3.3V or 5V Supply The LTC2321-16 has an onboard low drift (20ppm/C n Low Drift (20ppm/C Max) 2.048V or 4.096V Internal max) 2.048V or 4.096V temperature-compensated Reference reference. The LTC2321-16 also has a high speed SPI- n 1.8V to 2.5V I/O Voltages compatible serial interface that supports CMOS or LVDS. n CMOS or LVDS SPI-Compatible Serial I/O The fast 2Msps per channel throughput with no cycle n Power Dissipation 31mW/Ch (Typ) latency makes the LTC2321-16 ideally suited for a wide n Small 28-Lead (4mm 5mm) QFN Package variety of high speed applications. The LTC2321-16 dissipates only 31mW per channel and offers nap and APPLICATIONS sleep modes to reduce the power consumption to 5W n for further power savings during inactive periods. High Speed Data Acquisition Systems n Communications All registered trademarks and trademarks are the property of their respective owners. n Remote Data Acquisition n Imaging n Optical Networking n Automotive n Multiphase Motor Control TYPICAL APPLICATION 32k Point FFT f = 2Msps, f = 500kHz S IN 3.3V OR 5V 0 DIFFERENTIAL INPUTS 10F SNR = 81.0dB NO CONFIGURATION REQUIRED THD = 94.6dB + 20 IN , IN SINAD = 80.8dB V REFOUT1 DD INSTRUMENTATION DIFFERENTIAL 10F SFDR = 100.9dB 40 25 VBYP1 A + IN1 1F LTC2321-16 60 REFOUT2 0V 0V 10F 220pF 80 VBYP2 1F BIPOLAR UNIPOLAR 25 100 A SDO1 IN1 TO CONTROL A + SDO2 IN2 LOGIC A CLKOUT IN2 (FPGA, CPLD, 120 CMOS/LVDS SCK DSP, ETC.) 0V 0V V DD REFINT CNV 140 GND OGND OV 1.8V TO 2.5V DD 0 0.2 0.4 0.6 0.8 1 1F FREQUENCY (MHz) 232116 TA01a 232116 TA01b Rev. D 1 Document Feedback For more information www.analog.com AMPLITUDE (dBFS)LTC2321-16 ABSOLUTE MAXIMUM RATINGS PIN CONFIGURATION (Notes 1, 2) TOP VIEW Supply Voltage (V ) ..................................................6V DD Supply Voltage (OV ) ................................................3V DD Supply Bypass Voltage (V , V ) .......................3V BYP1 BYP2 Analog Input Voltage 28 27 26 25 24 23 A +, A (Note 3) ................... 0.3V to (V + 0.3V) V 1 22 SCK IN IN DD DD + A + 2 21 SCK REFOUT1,2 ............................0.3V to (V + 0.3V) IN2 DD A 3 20 SDO2 IN2 CNV (Note 15) .......................... 0.3V to (V + 0.3V) DD 29 + GND 4 19 SDO2 Digital Input Voltage GND GND 5 18 CLKOUT (Note 3) .......................... (GND 0.3V) to (OV + 0.3V) DD + 6 17 A CLKOUT IN1 Digital Output Voltage A + 7 16 SDO1 IN1 (Note 3) .......................... (GND 0.3V) to (OV + 0.3V) + DD V 8 15 SDO1 DD Power Dissipation ...............................................200mW 9 10 11 12 13 14 Operating Temperature Range LTC2321C ................................................ 0C to 70C LTC2321I..............................................40C to 85C UFD PACKAGE 28-LEAD (4mm 5mm) PLASTIC QFN LTC2321H .......................................... 40C to 125C T = 125C, = 43C/W JMAX JA Storage Temperature Range .................. 65C to 150C EXPOSED PAD (PIN 29) IS GND, MUST BE SOLDERED TO PCB ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LTC2321CUFD-16 PBF LTC2321CUFD-16 TRPBF 23216 28-Lead (4mm 5mm) Plastic QFN 0C to 70C LTC2321IUFD-16 PBF LTC2321IUFD-16 TRPBF 23216 28-Lead (4mm 5mm) Plastic QFN 40C to 85C LTC2321HUFD-16 PBF LTC2321HUFD-16 TRPBF 23216 28-Lead (4mm 5mm) Plastic QFN 40C to 125C Contact the factory for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container. Tape and reel specifications. Some packages are available in 500 unit reels through designated sales channels with TRMPBF suffix. ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at T = 25C (Note 4). A SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS V + Absolute Input Range (A +, A +) (Note 5) l 0 V V IN IN1 IN2 DD l V Absolute Input Range (A , A ) (Note 5) 0 V V IN IN1 IN2 DD V + V Input Differential Voltage Range V = V + V l REFOUT1,2 REFOUT1,2 V IN IN IN IN IN + l V Common Mode Input Range V = (V V )/2 0 V V CM IN IN IN DD I Analog Input DC Leakage Current l 1 1 A IN C Analog Input Capacitance 10 pF IN CMRR Input Common Mode Rejection Ratio f = 500kHz 85 dB IN I External Reference Current REFINT = 0V, REFOUT = 4.096V 310 A REFOUT Rev. D 2 For more information www.analog.com CNV REFINT GND REFRTN2 REFRTN1 REFOUT2 REFOUT1 CMOS/LVDS VBYP1 VBYP2 OV OGND DD