+ + + + + + LTC1408 6 Channel, 14-Bit, 600ksps Simultaneous Sampling ADC with Shutdown FEATURES DESCRIPTIO 600ksps ADC with 6 Simultaneously Sampled The LTC 1408 is a 14-bit, 600ksps ADC with six simulta- Differential Inputs neously sampled differential inputs. The device draws 100ksps Throughput per Channel only 5mA from a single 3V supply, and comes in a tiny 32 76dB SINAD pin (5mm 5mm) QFN package. A SLEEP shutdown Low Power Dissipation: 15mW feature lowers power consumption to 6W. The combina- 3V Single Supply Operation tion of low power and tiny package makes the LTC1408 2.5V Internal Bandgap Reference, Can be Overdriven suitable for portable applications. with External Reference The LTC1408 contains six separate differential inputs that 3-Wire Serial Interface are sampled simultaneously on the rising edge of the Internal Conversion Triggered by CONV CONV signal. These six sampled inputs are then SLEEP (6W) Shutdown Mode converted at a rate of 100ksps per channel. NAP (3.3mW) Shutdown Mode The 90dB common mode rejection allows users to 0V to 2.5V Unipolar, or 1.25V Bipolar Differential eliminate ground loops and common mode noise by Input Range measuring signals differentially from the source. 90dB 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 The serial interface sends out the six conversion results in other trademarks are the property of their respective owners. Protected by U.S. Patents 96 clocks for compatibility with standard serial interfaces. including 6084440, 6522187. 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 14-BIT LATCH 0 OV DD 3 THREE- 3V 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 600ksps SERIAL 1 14-BIT ADC 14-BIT LATCH 3 OUTPUT 0.1F 14-BIT LATCH 4 PORT 2 14-BIT LATCH 5 OGND MUX TIMING 30 CONV 2.5V LOGIC REFERENCE 32 SCK 31 DGND V GND REF 33 22 23 29 26 27 28 10F 1408 TA01 BIP SEL2 SEL1 SEL0 1408fa 1 W ULTC1408 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 Input Voltage 16 15 14 13 12 11 10 9 + CH4 17 8 CH1 (Note 3) ................................... 0.3V to (V + 0.3V) DD + CH4 18 7 CH1 LTC1408CUH Digital Input Voltage .................... 0.3V to (V + 0.3V) GND 19 6 GND DD + LTC1408IUH CH5 20 5 CH0 Digital Output Voltage .................. 0.3V to (V + 0.3V) DD 33 + CH5 21 4 CH0 Power Dissipation.............................................. 100mW GND 22 3 OV DD V 23 2 OGND Operation Temperature Range REF QFN PART MARKING V 24 1 SDO CC LTC1408C ............................................... 0C to 70C 25 26 27 28 29 30 31 32 LTC1408I............................................ 40C to 85C 1408 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: