LTC2355-12/LTC2355-14 Serial 12-Bit/14-Bit, 3.5Msps Sampling ADCs with Shutdown FEATURES DESCRIPTION n 3.5Msps Conversion Rate The LTC 2355-12/LTC2355-14 are 12-bit/14-bit, 3.5Msps n 74.2dB SINAD at 14-Bits, 71.1dB SINAD at 12-Bits serial ADCs with differential inputs. The devices draw n Low Power Dissipation: 18mW only 5.5mA from a single 3.3V supply and come in a n 3.3V Single Supply Operation tiny 10-lead MSOP package. A Sleep shutdown feature n 2.5V Internal Bandgap Reference can be Overdriven further reduces power consumption to 13W. The com- n 3-Wire SPI-Compatible Serial Interface bination of speed, low power and tiny package makes the n Sleep (13W) Shutdown Mode LTC2355-12/LTC2355-14 suitable for high speed, portable n Nap (4mW) Shutdown Mode applications. n 80dB Common Mode Rejection The 80dB common mode rejection allows users to eliminate n 0V to 2.5V Unipolar Input Range ground loops and common mode noise by measuring n Tiny 10-Lead MSOP Package signals differentially from the source. The devices convert 0V to 2.5V unipolar inputs differentially. APPLICATIONS + The absolute voltage swing for A and A extends from IN IN ground to the supply voltage. n Communications n Data Acquisition Systems The serial interface sends out the conversion results during n Uninterrupted Power Supplies the 16 clock cycles following a CONV rising edge for com- n Multiphase Motor Control patibility with standard serial interfaces. If two additional n Multiplexed Data Acquisition clock cycles for acquisition time are allowed after the data n RFID stream in between conversions, the full sampling rate of L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and 3.5Msps can be achieved with a 63MHz clock. SoftSpan is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. BLOCK DIAGRAM 10F 3.3V THD, 2nd, 3rd and SFDR vs Input Frequency 50 7 V LTC2355-14 DD 56 62 + A THREE- IN 1 + THD STATE 68 2nd S & H 14-BIT ADC SDO SERIAL 8 74 OUTPUT 3rd A IN 2 PORT 80 14 86 V REF 92 3 10 CONV 2.5V TIMING 98 10F REFERENCE LOGIC GND 104 4 9 SCK 110 2355 TA01 0.1 1 10 100 5 6 11 EXPOSED PAD FREQUENCY (MHz) 2355 G02 2355fb 1 For more information www.linear.com/LTC2355-12 14-BIT LATCH THD, 2nd, 3rd (dB)LTC2355-12/LTC2355-14 ABSOLUTE MAXIMUM RATINGS PIN CONFIGURATION (Notes 1, 2) TOP VIEW Supply Voltage (V ) ..................................................4V DD + A 1 10 CONV IN A 2 9 SCK Analog and V Input Voltages IN REF 11 V 3 8 SDO REF GND (Note 3) ....................................0.3V to (V + 0.3V) GND 4 7 V DD DD GND 5 6 GND Digital Input Voltages ................... 0.3V to (V + 0.3V) DD MSE PACKAGE Digital Output Voltage ...................0.3V to (V + 0.3V) DD 10-LEAD PLASTIC MSOP T = 125C, = 40C/W Power Dissipation ...............................................100mW JMAX JA EXPOSED PAD (PIN 11) IS GND, MUST BE SOLDERED TO PCB Operation Temperature Range LTC2355C-12/LTC2355C-14 ..................... 0C to 70C LTC2355I-12/LTC2355I-14 ...................40C to 85C Storage Temperature Range .................. 65C to 150C Lead Temperature (Soldering, 10 sec) ...................300C