+ + + + + + LTC2351-14 6-Channel, 14-Bit, 1.5Msps Simultaneous Sampling ADC with Shutdown FEATURES DESCRIPTION n 1.5Msps ADC with Six Simultaneously Sampled The LTC 2351-14 is a 14-bit, 1.5Msps ADC with six simul- Differential Inputs taneously sampled differential inputs. The device draws n 250ksps Throughput per Channel only 5.5mA from a single 3V supply, and comes in a tiny n 75dB SINAD 32-pin (5mm 5mm) QFN package. A sleep shutdown n Low Power Dissipation: 16.5mW mode further reduces power consumption to 12W. The n 3V Single Supply Operation combination of low power and tiny package makes the n 2.5V Internal Bandgap Reference, Can Be Overdriven LTC2351-14 suitable for portable applications. with External Reference The LTC2351-14 contains six separate differential inputs n 3-Wire SPI-Compatible Serial Interface that are sampled simultaneously on the rising edge of the n Internal Conversion Triggered by CONV CONV signal. These six sampled inputs are then converted n Sleep (12W) Shutdown Mode at a rate of 250ksps per channel. n NAP (4.5mW) Shutdown Mode The 83dB common mode rejection allows users to eliminate n 0V to 2.5V Unipolar, or 1.25V Bipolar Differential ground loops and common mode noise by measuring Input Range signals differentially from the source. n 83dB Common Mode Rejection n Tiny 32-Pin (5mm 5mm) QFN Package The device converts 0V to 2.5V unipolar inputs differentially, or 1.25V bipolar inputs also differentially, depending on the APPLICATIONS state of the BIP pin. Any analog input may swing rail-to-rail as long as the differential input range is maintained. n Multiphase Power Measurement n Multiphase Motor Control The conversion sequence can be abbreviated to convert n Data Acquisition Systems fewer than six channels, depending on the logic state of n Uninterruptable Power Supplies the SEL2, SEL1 and SEL0 inputs. L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. The serial interface sends out the six conversion results in 96 All other trademarks are the property of their respective owners. Protected by U.S. Patents, including 6084440, 6522187. clocks for compatibility with standard serial interfaces. BLOCK DIAGRAM 10F 3V + + + + + + CH5 CH5 CH4 CH4 CH3 CH3 CH2 CH2 CH1 CH1 CH0 CH0 V V CC DD 21 20 19 18 17 16 15 14 12 11 10 9 8 7 6 5 4 24 25 13 OV DD 14-BIT LATCH 0 3V 3 THREE- 14-BIT LATCH 1 S AND H S AND H S AND H S AND H S AND H S AND H STATE 14-BIT LATCH 2 SD0 1.5Msps SERIAL 1 14-BIT ADC 14-BIT LATCH 3 OUTPUT 0.1F 14-BIT LATCH 4 OGND PORT 2 14-BIT LATCH 5 MUX CONV TIMING 30 2.5V LOGIC SCK REFERENCE 32 DGND 31 33 22 23 29 26 27 28 235114 TA01 10F GND V BIP SEL2 SEL1 SEL0 REF 235114fb 1LTC2351-14 ABSOLUTE MAXIMUM RATINGS PIN CONFIGURATION (Notes 1, 2) TOP VIEW Supply Voltage (V , V , OV ) ................................ 4V DD CC DD Analog and V Input Voltages REF (Note 3) ................................... 0.3V to (V + 0.3V) DD 16 15 14 13 12 11 10 9 + Digital Input Voltages ................... 0.3V to (V + 0.3V) CH4 17 8 CH1 DD + CH4 18 7 CH1 Digital Output Voltage .................. 0.3V to (V + 0.3V) DD GND GND 19 6 Power Dissipation ...............................................100mW + CH5 20 5 CH0 Operation Temperature Range 33 + CH5 21 4 CH0 LTC2351C-14 ........................................... 0C to 70C GND 22 3 OV DD LTC2351I-14 ........................................ 40C to 85C V 23 2 OGND REF LTC2351H-14 ..................................... 40C to 125C V SDO 24 1 CC Storage Temperature Range ................... 65C to 150C 25 26 27 28 29 30 31 32 QFN PACKAGE 32-PIN (5mm s 5mm) PLASTIC QFN T = 150C, = 34C/W JMAX JA EXPOSED PAD (PIN 33) IS GND, MUST BE SOLDERED TO PCB ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LTC2351CUH-14 PBF LTC2351CUH-14 TRPBF 235114 0C to 70C 32-Pin (5mm 5mm) Plastic QFN LTC2351IUH-14 PBF LTC2351IUH-14 TRPBF 235114 40C to 85C 32-Pin (5mm 5mm) Plastic QFN LTC2351HUH-14 PBF LTC2351HUH-14 TRPBF 235114 32-Pin (5mm 5mm) Plastic QFN 40C to 125C Consult LTC Marketing for parts speci ed with wider operating temperature ranges. *The temperature grade is identi ed by a label on the shipping container. For more information on lead free part marking, go to: