+ + + + + + LTC1408-12 6 Channel, 12-Bit, 600ksps Simultaneous Sampling ADC with Shutdown FEATURES DESCRIPTIO 600ksps ADC with 6 Simultaneously Sampled The LTC 1408-12 is a 12-bit, 600ksps ADC with six Differential Inputs simultaneously sampled differential inputs. The device 100ksps Throughput per Channel draws only 5mA from a single 3V supply, and comes in a 72dB SINAD tiny 32 pin (5mm 5mm) QFN package. A SLEEP shut- Low Power Dissipation: 15mW down feature further reduces power consumption to 3V Single Supply Operation 6W. The combination of low power and tiny package 2.5V Internal Bandgap Reference, Can be Overdriven makes the LTC1408-12 suitable for portable applications. with External Reference The LTC1408-12 contains six separate differential inputs 3-Wire SPI-Compatible Serial Interface that are sampled simultaneously on the rising edge of the 0V to 2.5V Unipolar, or 1.25V Bipolar Differential CONV signal. These six sampled inputs are then Input Range converted at a rate of 100ksps per channel. SLEEP (6W) Shutdown Mode The 83dB common mode rejection allows users to NAP (3.3mW) Shutdown Mode eliminate ground loops and common mode noise by Internal Conversion Triggered by CONV measuring signals differentially from the source. 83dB Common Mode Rejection Tiny 32-Pin (5mm 5mm) QFN Package The device converts 0V to 2.5V unipolar inputs differen- tially, or 1.25V bipolar inputs also differentially, U depending on the state of the BIP pin. Any analog input APPLICATIO S may swing rail-to-rail as long as the differential input Multiphase Power Measurement range is maintained. Multiphase Motor Control The conversion sequence can be abbreviated to convert Data Acquisition Systems fewer than six channels, depending on the logic state of Uninterruptable Power Supplies the SEL2, SEL1 and SEL0 inputs. , LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. The serial interface sends out the six conversion results in Protected by U.S. Patents including 6084440, 6522187. 96 clocks for compatibility with standard serial interfaces. BLOCK DIAGRA + + + + + + 10F3V 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 12-BIT LATCH 0 OV DD 3 3V 12-BIT LATCH 1 THREE- S AND H S AND H S AND H S AND H S AND H S AND H STATE 12-BIT LATCH 2 600ksps SD0 SERIAL 1 12-BIT ADC 12-BIT LATCH 3 OUTPUT 0.1F 12-BIT LATCH 4 PORT 2 12-BIT LATCH 5 OGND MUX TIMING 30 CONV 2.5V LOGIC REFERENCE 32 SCK 31 DGND GND V REF 33 22 23 29 26 27 28 10F 235114 TA01 BIP SEL2 SEL1 SEL0 140812f 1 W ULTC1408-12 O PACKAGE/ORDER I FOR ATIO ABS LUTEXAI U RATI GS (Notes 1, 2) TOP VIEW ORDER PART Supply Voltage (V , V , OV ) .............................. 4V DD CC DD NUMBER Analog and V Input Voltages REF 32 31 30 29 28 27 26 25 1 24 (Note 3) ................................... 0.3V to (V + 0.3V) SDO V CC LTC1408CUH-12 DD 2 23 V OGND REF Digital Input Voltages .................. 0.3V to (V + 0.3V) LTC1408IUH-12 DD OV 3 22 GND DD + Digital Output Voltage .................. 0.3V to (V + 0.3V) CH0 4 21 CH5 DD 33 5 20 CH0 CH5+ Power Dissipation.............................................. 100mW 6 19 GND GND Operation Temperature Range + CH1 7 18 CH4 CH1 8 17 CH4+ QFN PART MARKING LTC1408C-12 .......................................... 0C to 70C 9 10 11 12 13 14 15 16 LTC1408I-12 ...................................... 40C to 85C 1408-12 Storage Temperature Range ................. 65C to 125C QFN PACKAGE 32-PIN (5mm 5mm) PLASTIC QFN T = 125C, = 34C/ W JMAX JA EXPOSED PIN IS GND (PAD 33) MUST BE SOLDERED TO PCB Order Options Tape and Reel: Add TR Lead Free: Add PBF Lead Free Tape and Reel: Add TRPBF Lead Free Part Marking: