LTC2400 24-Bit m Power TM No Latency DS ADC in SO-8 FEATURES DESCRIPTIO n 24-Bit ADC in SO-8 Package The LTC 2400 is a 2.7V to 5.5V micropower 24-bit n 4ppm INL, No Missing Codes converter with an integrated oscillator, 4ppm INL and n 4ppm Full-Scale Error 0.3ppm RMS noise. It uses delta-sigma technology and n Single Conversion Settling Time provides single cycle settling time for multiplexed appli- for Multiplexed Applications cations. Through a single pin the LTC2400 can be config- n 0.5ppm Offset ured for better than 110dB rejection at 50Hz or 60Hz 2%, n 0.3ppm Noise or it can be driven by an external oscillator for a user n Internal OscillatorNo External Components defined rejection frequency in the range 1Hz to 120Hz. Required The internal oscillator requires no external frequency n 110dB Min, 50Hz/60Hz Notch Filter setting components. n Reference Input Voltage: 0.1V to V CC The converter accepts any external reference voltage from n Live ZeroExtended Input Range Accommodates 0.1V to V . With its extended input conversion range of CC 12.5% Overrange and Underrange 12.5% V to 112.5% V , the LTC2400 smoothly REF REF n Single Supply 2.7V to 5.5V Operation resolves the offset and overrange problems of preceding n Low Supply Current (200m A) and Auto Shutdown sensors or signal conditioning circuits. U The LTC2400 communicates through a flexible 3-wire APPLICATIO S digital interface which is compatible with SPI and TM n Weight Scales MICROWIRE protocols. n Direct Temperature Measurement , LTC and LT are registered trademarks of Linear Technology Corporation. No Latency S is a trademark of Linear Technology Corporation. n Gas Analyzers MICROWIRE is a trademark of National Semiconductor Corporation. n Strain-Gage Transducers n Instrumentation n Data Acquisition n Industrial Process Control n 6-Digit DVMs TYPICAL APPLICATIO Total Unadjusted Error vs Output Code 10 V = 5V CC 2.7V TO 5.5V 8 V = 5V REF V CC 1F T = 25C A = INTERNAL OSC/50Hz REJECTION 6 F = LOW O = EXTERNAL CLOCK SOURCE V F CC O 4 = INTERNAL OSC/60Hz REJECTION 2 LTC2400 REFERENCE 0 V SCK VOLTAGE REF 2 0.1V TO V CC 3-WIRE 4 ANALOG SPI INTERFACE INPUT RANGE V SDO IN 6 0.12V TO 1.12V REF REF GND CS 8 2400 TA01 10 0 8,338,608 16,777,215 OUTPUT CODE (DECIMAL) 2400 TA02 1 LINEARITY ERROR (ppm) U ULTC2400 UUW ABSOLUTE MAXIMUM RATINGS PACKAGE/ORDER INFORMATION (Notes 1, 2) ORDER PART NUMBER TOP VIEW Supply Voltage (V ) to GND.......................0.3V to 7V CC Analog Input Voltage to GND ....... 0.3V to (V + 0.3V) V 1 8 F CC CC O LTC2400CS8 Reference Input Voltage to GND .. 0.3V to (V + 0.3V) V 2 7 SCK CC REF LTC2400IS8 Digital Input Voltage to GND ........ 0.3V to (V + 0.3V) V 3 6 SDO CC IN Digital Output Voltage to GND ..... 0.3V to (V + 0.3V) GND 4 5 CS CC S8 PART MARKING Operating Temperature Range S8 PACKAGE 8-LEAD PLASTIC SO 2400 LTC2400C ............................................... 0 C to 70 C T = 125 C, q = 130 C/W JMAX JA 2400I LTC2400I............................................ 40 C to 85 C Storage Temperature Range ................. 65 C to 150 C Consult factory for Military grade parts. Lead Temperature (Soldering, 10 sec).................. 300 C CONVERTER CHARACTERISTICS The l denotes specifications which apply over the full operating temperature range, otherwise specifications are at T = 25 C. (Notes 3, 4) A PARAMETER CONDITIONS MIN TYP MAX UNITS Resolution (No Missing Codes) 0.1V V V , (Note 5) l 24 Bits REF CC Integral Nonlinearity V = 2.5V (Note 6) l 2 10 ppm of V REF REF V = 5V (Note 6) l 4 15 ppm of V REF REF Offset Error 2.5V V V l 0.5 2 ppm of V REF CC REF Offset Error Drift 2.5V V V 0.01 ppm of V / C REF CC REF Full-Scale Error 2.5V V V l 4 10 ppm of V REF CC REF Full-Scale Error Drift 2.5V V V 0.02 ppm of V / C REF CC REF Total Unadjusted Error V = 2.5V 5 ppm of V REF REF V = 5V 10 ppm of V REF REF Output Noise V = 0V (Note 13) 1.5 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 V = 2.5V, V = 0V 100 dB REF IN Power Supply Rejection, 60Hz 2% V = 2.5V, V = 0V, (Notes 7, 15) 110 dB REF IN Power Supply Rejection, 50Hz 2% V = 2.5V, V = 0V, (Notes 8, 15) 110 dB REF IN A ALOG I PUT A D REFERE CE The l denotes specifications which apply over the full operating temperature range, otherwise specifications are at T = 25 C. (Note 3) A SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS V Input Voltage Range (Note 14) l 0.125 V 1.125 V V IN REF REF V Reference Voltage Range l 0.1 V V REF CC C Input Sampling Capacitance 10 pF S(IN) C Reference Sampling Capacitance 15 pF S(REF) I Input Leakage Current CS = V l 10 1 10 nA IN(LEAK) CC I Reference Leakage Current V = 2.5V, CS = V l 10 1 10 nA REF(LEAK) REF CC 2 U U U U U U WWW