LTC2401/LTC2402 1-/2-Channel 24-Bit m Power TM No Latency DS ADCs in MSOP-10 FEATURES DESCRIPTIO n 24-Bit ADCs in Tiny MSOP-10 Packages The LTC 2401/LTC2402 are 1- and 2-channel 2.7V to 5.5V n 4ppm INL, No Missing Codes micropower 24-bit analog-to-digital converters with an n 4ppm Full-Scale Error integrated oscillator, 4ppm INL and 0.6ppm RMS noise. n 0.5ppm Offset These ultrasmall devices use delta-sigma technology and n 0.6ppm Noise a new digital filter architecture that settles in a single cycle. n Single Conversion Settling Time for This eliminates the latency found in conventional Multiplexed Applications converters and simplifies multiplexed applications. n 1- or 2-Channel Inputs Through a single pin, the LTC2401/LTC2402 can be n Automatic Channel Selection (Ping-Pong) (LTC2402) configured for better than 110dB rejection at 50Hz or n Zero Scale and Full Scale Set for Reference 60Hz 2%, or can be driven by an external oscillator for and Ground Sensing a user defined rejection frequency in the range 1Hz to n Internal OscillatorNo External Components Required 120Hz. The internal oscillator requires no external fre- n 110dB Min, 50Hz/60Hz Notch Filter quency setting components. n Reference Input Voltage: 0.1V to V CC n These converters accept an external reference voltage Live ZeroExtended Input Range Accommodates from 0.1V to V . With an extended input conversion 12.5% Overrange and Underrange CC n range of 12.5% V to 112.5% V (V = FS Single Supply 2.7V to 5.5V Operation REF REF REF SET n ZS ), the LTC2401/LTC2402 smoothly resolve the off- Low Supply Current (200m A) and Auto Shutdown SET set and overrange problems of preceding sensors or U signal conditioning circuits. APPLICATIO S The LTC2401/LTC2402 communicate through a 2- or n Weight Scales 3-wire digital interface that is compatible with SPI and n Direct Temperature Measurement TM MICROWIRE protocols. n Gas Analyzers , LTC and LT are registered trademarks of Linear Technology Corporation. n Strain Gauge Transducers No Latency is a trademark of Linear Technology Corporation. n MICROWIRE is a trademark of National Semiconductor Corporation. Instrumentation n Data Acquisition n Industrial Process Control TYPICAL APPLICATIO Pseudo Differential Bridge Digitizer 2.7V TO 5.5V 2.7V TO 5.5V V CC 1F 1 = INTERNAL OSC/50Hz REJECTION 110 V CC = EXTERNAL CLOCK SOURCE V F CC O LTC2402 = INTERNAL OSC/60Hz REJECTION 2 LTC2402 FS 9 SET SCK 2 9 REFERENCE VOLTAGE FS SCK SET ZS + 0.1V TO V 4 SET CC 8 3-WIRE CH0 SDO 3 8 3-WIRE ANALOG INPUT RANGE SPI INTERFACE CH1 SDO SPI INTERFACE ZS 0.12V TO 3 SET REF 7 CH1 CS FS + 0.12V 4 7 SET REF CS CH0 (V = FS ZS ) REF SET SET 10 5 ZS 5 6 F SET O INTERNAL OSCILLATOR 0V TO FS 100mV ZS GND SET SET GND 60Hz REJECTION 24012 TA01 6 24012TA02 1 U DS DS ULTC2401/LTC2402 ABSOLUTE MAXIMUM RATINGS (Notes 1, 2) Supply Voltage (V ) to GND.......................0.3V to 7V Operating Temperature Range CC Analog Input Voltage to GND ....... 0.3V to (V + 0.3V) LTC2401/LTC2402C ................................ 0 C to 70 C CC Reference Input Voltage to GND .. 0.3V to (V + 0.3V) LTC2401/LTC2402I ............................ 40 C to 85 C CC Digital Input Voltage to GND ........ 0.3V to (V + 0.3V) Storage Temperature Range ................. 65 C to 150 C CC Digital Output Voltage to GND ..... 0.3V to (V + 0.3V) Lead Temperature (Soldering, 10 sec).................. 300 C CC UUW PACKAGE/ORDER INFORMATION ORDER PART NUMBER ORDER PART NUMBER TOP VIEW TOP VIEW LTC2401CMS V V 1 10 F 1 10 F LTC2402CMS CC O CC O FS FS 2 9 SCK 2 9 SCK SET SET LTC2401IMS LTC2402IMS CH1 V 3 8 SDO 3 8 SDO IN CH0 NC 4 7 CS 4 7 CS ZS ZS 5 6 GND 5 6 GND SET SET MS10 PART MARKING MS10 PART MARKING MS10 PACKAGE MS10 PACKAGE 10-LEAD PLASTIC MSOP 10-LEAD PLASTIC MSOP LTMB LTMD T = 125 C, q = 130 C/W T = 125 C, q = 130 C/W JMAX JA JMAX JA LTMC LTME Consult factory for Military grade parts. CONVERTER CHARACTERISTICS The l denotes specifications which apply over the full operating temperature range, otherwise specifications are at T = 25 C. V = FS ZS . (Notes 3, 4) A REF SET SET PARAMETER CONDITIONS MIN TYP MAX UNITS Resolution l 24 Bits No Missing Codes Resolution 0.1V FS V , ZS = 0V (Note 5) l 24 Bits SET CC SET Integral Nonlinearity FS = 2.5V, ZS = 0V (Note 6) l 2 10 ppm of V SET SET REF FS = 5V, ZS = 0V (Note 6) l 4 15 ppm of V SET SET REF Offset Error 2.5V FS V , ZS = 0V l 0.5 2 ppm of V SET CC SET REF Offset Error Drift 2.5V FS V , ZS = 0V 0.01 ppm of V / C SET CC SET REF Full-Scale Error 2.5V FS V , ZS = 0V l 4 10 ppm of V SET CC SET REF Full-Scale Error Drift 2.5V FS V , ZS = 0V 0.04 ppm of V / C SET CC SET REF Total Unadjusted Error FS = 2.5V, ZS = 0V 5 ppm of V SET SET REF FS = 5V, ZS = 0V 10 ppm of V SET SET REF Output Noise V = 0V (Note 13) 3 m V IN RMS Normal Mode Rejection 60Hz 2% (Note 7) l 110 130 dB Normal Mode Rejection 50Hz 2% (Note 8) l 110 130 dB Power Supply Rejection, DC FS = 2.5V, ZS = 0V, V = 0V 100 dB SET SET IN Power Supply Rejection, 60Hz 2% FS = 2.5V, ZS = 0V, V = 0V, (Notes 7, 15) 110 dB SET SET IN Power Supply Rejection, 50Hz 2% FS = 2.5V, ZS = 0V, V = 0V, (Notes 8, 15) 110 dB SET SET IN 2 U U WWW