LTC1860L/LTC1861L Power, 3V, 12-Bit, 150ksps 1- and 2-Channel ADCs in MSOP FEATURES DESCRIPTIO n 12-Bit 150ksps ADCs in MSOP Package The LTC 1860L/LTC1861L are 12-bit A/D converters that n Single 3V Supply are offered in MSOP and SO-8 packages and operate on a n Low Supply Current: 450A (Typ) single 3V supply. At 150ksps, the supply current is only n Auto Shutdown Reduces Supply Current 450A. The supply current drops at lower speeds because to 10A at 1ksps the LTC1860L/LTC1861L automatically power down be- n True Differential Inputs tween conversions. These 12-bit switched capacitor suc- n 1-Channel (LTC1860L) or 2-Channel (LTC1861L) cessive approximation ADCs include sample-and-holds. Versions The LTC1860L has a differential analog input with an TM n SPI/MICROWIRE Compatible Serial I/O external reference pin. The LTC1861L offers a software- n High Speed Upgrade to LTC1285/LTC1288 selectable 2-channel MUX and an external reference pin on n Pin Compatible with 16-Bit LTC1864L/LTC1865L the MSOP version. n No Minimum Data Transfer Rate The 3-wire, serial I/O, MSOP or SO-8 package and U extremely high sample rate-to-power ratio make these APPLICATIO S ADCs ideal choices for compact, low power, high speed n High Speed Data Acquisition systems. n Portable or Compact Instrumentation These ADCs can be used in ratiometric applications or with n Low Power Battery-Operated Instrumentation external references. The high impedance analog inputs n Isolated and/or Remote Data Acquisition and the ability to operate with reduced spans down to 1V full scale allow direct connection to signal sources in many applications, eliminating the need for external gain stages. , LTC and LT are registered trademarks of Linear Technology Corporation. MICROWIRE is a trademark of National Semiconductor Corporation. TYPICAL APPLICATIO Supply Current vs Sampling Frequency 1000 Single 3V Supply, 150ksps, 12-Bit Sampling ADC CONV LOW = 1.5s T = 25C A 1F V = 2.7V CC 100 3V LTC1860L 10 1 8 V V REF CC 2 7 + IN SCK ANALOG INPUT SERIAL DATA LINK TO 1 3 6 0V TO 3V ASIC, PLD, MPU, DSP IN SDO OR SHIFT REGISTERS 4 5 GND CONV 1860L TA01 0.1 0.01 0.1 1 10 100 1000 SAMPLING FREQUENCY (kHz) 1860L/61L TA02 18601Lf 1 SUPPLY CURRENT (A) U ULTC1860L/LTC1861L ABSOLUTE AXI U RATI GS (Notes 1, 2) Power Dissipation.............................................. 400mW Supply Voltage (V ) ................................................. 7V CC Operating Temperature Range Ground Voltage Difference LTC1860LC/LTC1861LC......................... 0C to 70C AGND, DGND LTC1861L MSOP Package ......... 0.3V LTC1860LI/LTC1861LI ...................... 40C to 85C Analog Input .................... (GND 0.3V) to (V + 0.3V) CC Storage Temperature Range ................. 65C to 150C Digital Input ..................................... (GND 0.3V) to 7V Lead Temperature (Soldering, 10 sec)................. 300C Digital Output .................. (GND 0.3V) to (V + 0.3V) CC UUW PACKAGE/ORDER I FOR ATIO ORDER PART ORDER PART TOP VIEW TOP VIEW NUMBER NUMBER V 1 8 V REF CC CONV 1 10 V REF + 7 SCK IN 2 CH0 2 9 V CC LTC1860LCMS8 LTC1861LCMS IN 3 6 SDO CH1 3 8 SCK 5 CONV GND 4 LTC1860LIMS8 AGND 4 7 SDO LTC1861LIMS DGND 5 6 SDI MS8 PACKAGE MS8 PART MARKING MS PART MARKING 8-LEAD PLASTIC MSOP MS PACKAGE 10-LEAD PLASTIC MSOP T = 150C, = 210C/W JMAX JA LTD2 LTD4 T = 150C, = 210C/W JMAX JA LTD3 LTD5 ORDER PART ORDER PART TOP VIEW TOP VIEW NUMBER NUMBER 1 8 V 1 8 V CONV V CC REF CC + CH0 2 7 SCK IN 2 7 SCK LTC1860LCS8 LTC1861LCS8 CH1 3 6 SDO IN 3 6 SDO LTC1860LIS8 LTC1861LIS8 GND 4 5 SDI GND 4 5 CONV S8 PART MARKING S8 PART MARKING S8 PACKAGE S8 PACKAGE 8-LEAD PLASTIC SO 1861L 8-LEAD PLASTIC SO 1860L T = 150C, = 175C/W T = 150C, = 175C/W 1861LI JMAX JA JMAX JA 1860LI Consult LTC Marketing for parts specified with wider operating temperature ranges. CO VERTER A D ULTIPLEXER CHARACTERISTICS The l denotes specifications which apply over the full operating temperature range, otherwise specifications are T = 25C. A V = 2.7V, V = 2.5V, f = f as defined in Recommended Operating Conditions, unless otherwise noted. CC REF SCK SCK(MAX) PARAMETER CONDITIONS MIN TYP MAX UNITS Resolution l 12 Bits No Missing Codes Resolution l 12 Bits INL (Note 3) l 1 LSB Transition Noise 0.13 LSB RMS Gain Error l 20 mV Offset Error l 2 5mV + Input Differential Voltage Range V = IN IN l0V V IN REF + Absolute Input Range IN Input 0.05 V + 0.05 V CC IN Input 0.05 V /2 V CC V Input Range LTC1860L S0-8 and MSOP, LTC1861L MSOP 1 V V REF CC Analog Input Leakage Current (Note 4) l 1 A C Input Capacitance In Sample Mode 12 pF IN During Conversion 5 pF 18601Lf 2 WU U U WWW