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LTC2351-14 Datasheet(PDF) 1 Page - Linear Technology |
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LTC2351-14 Datasheet(HTML) 1 Page - Linear Technology |
1 / 20 page LTC2351-14 1 235114fb FEATURES APPLICATIONS DESCRIPTION 6-Channel, 14-Bit, 1.5Msps Simultaneous Sampling ADC with Shutdown The LTC®2351-14 is a 14-bit, 1.5Msps ADC with six simul- taneously sampled differential inputs. The device draws only 5.5mA from a single 3V supply, and comes in a tiny 32-pin (5mm × 5mm) QFN package. A sleep shutdown mode further reduces power consumption to 12μW. The combination of low power and tiny package makes the LTC2351-14 suitable for portable applications. The LTC2351-14 contains six separate differential inputs that are sampled simultaneously on the rising edge of the CONV signal. These six sampled inputs are then converted at a rate of 250ksps per channel. The 83dB common mode rejection allows users to eliminate ground loops and common mode noise by measuring signals differentially from the source. The device converts 0V to 2.5V unipolar inputs differentially, or ±1.25V bipolar inputs also differentially, depending on the state of the BIP pin. Any analog input may swing rail-to-rail as long as the differential input range is maintained. The conversion sequence can be abbreviated to convert fewer than six channels, depending on the logic state of the SEL2, SEL1 and SEL0 inputs. Theserialinterfacesendsoutthesixconversionresultsin96 clocks for compatibility with standard serial interfaces. n 1.5Msps ADC with Six Simultaneously Sampled Differential Inputs n 250ksps Throughput per Channel n 75dB SINAD n Low Power Dissipation: 16.5mW n 3V Single Supply Operation n 2.5V Internal Bandgap Reference, Can Be Overdriven with External Reference n 3-Wire SPI-Compatible Serial Interface n Internal Conversion Triggered by CONV n Sleep (12μW) Shutdown Mode n NAP (4.5mW) Shutdown Mode n 0V to 2.5V Unipolar, or ±1.25V Bipolar Differential Input Range n 83dB Common Mode Rejection n Tiny 32-Pin (5mm × 5mm) QFN Package n Multiphase Power Measurement n Multiphase Motor Control n Data Acquisition Systems n Uninterruptable Power Supplies L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Protected by U.S. Patents, including 6084440, 6522187. BLOCK DIAGRAM – 4 5 25 24 – 7 6 9 12 13 16 19 8 CH0– CH0+ CH1– CH1+ 10 11 – 14 15 CH2– CH2+ CH3– CH3+ – 17 18 – 20 21 S AND H S AND H S AND H S AND H S AND H CH4– CH4+ CH5– CH5+ MUX VREF 10μF BIP SEL2 SEL1 SEL0 GND 2.5V REFERENCE 1.5Msps 14-BIT ADC 14-BIT LATCH 5 14-BIT LATCH 4 14-BIT LATCH 3 14-BIT LATCH 2 14-BIT LATCH 1 14-BIT LATCH 0 10μF 3V VCC VDD 26 29 23 22 33 27 28 2 1 SD0 0.1μF 3 OVDD 3V 32 SCK 31 DGND OGND 30 CONV THREE- STATE SERIAL OUTPUT PORT TIMING LOGIC 235114 TA01 – S AND H |
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