LTC2404/LTC2408 4-/8-Channel 24-Bit m Power TM No Latency DS ADCs FEATURES DESCRIPTIO n Pin Compatible 4-/8-Channel 24-Bit ADCs The LTC 2404/LTC2408 are 4-/8-channel 2.7V to 5.5V n Single Conversion Digital Filter Settling Time micropower 24-bit A/D converters with an integrated Simplifies Multiplexing oscillator, 4ppm INL and 0.3ppm RMS noise. They use n 4ppm INL, No Missing Codes delta-sigma technology and provide single cycle digital n 4ppm Full-Scale Error filter settling time (no latency delay) for multiplexed n 0.5ppm Offset applications. The first conversion after the channel is n 0.3ppm Noise changed is always valid. Through a single pin the LTC2404/ n Internal OscillatorNo External Components LTC2408 can be configured for better than 110dB rejec- Required tion at 50Hz or 60Hz 2%, or can be driven by an external n 110dB Min, 50Hz/60Hz Notch Filter oscillator for a user defined rejection frequency in the n Reference Input Voltage: 0.1V to V range 1Hz to 120Hz. The internal oscillator requires no CC n Live ZeroExtended Input Range Accommodates external frequency setting components. 12.5% Overrange and Underrange The converters accept any external reference voltage from n Single Supply 2.7V to 5.5V Operation 0.1V to V . With their extended input conversion range of CC n Low Supply Current (200m A) and Auto Shutdown 12.5% V to 112.5% V the LTC2404/LTC2408 REF REF U smoothly resolve the offset and overrange problems of APPLICATIO S preceding sensors or signal conditioning circuits. n Weight Scales The LTC2404/LTC2408 communicate through a flexible n Direct Temperature Measurement 4-wire digital interface which is compatible with SPI and TM n Gas Analyzers MICROWIRE protocols. n Strain Gauge Transducers , LTC and LT are registered trademarks of Linear Technology Corporation. No Latency DS is a trademark of Linear Technology Corporation. n Instrumentation MICROWIRE is a trademark of National Semiconductor Corporation. n Data Acquisition n Industrial Process Control n 6-Digit DVMs TYPICAL APPLICATIO Total Unadjusted Error vs Output Code 0.1V TO V 2.7V TO 5.5V CC 10 V = 5V DD 8 V = 5V 7 4 3 2, 8 REF 1F T = 25C A MUXOUT ADCIN V V 6 REF CC F = LOW O SERIAL DATA LINK 9 CH0 4 MICROWIRE AND 23 10 CH1 CSADC SPI COMPATABLE 2 20 11 CH2 CSMUX 0 19 ANALOG 12 CH3 SCK 24-BIT 4-/8-CHANNEL INPUTS 25 2 13 CH4* S ADC CLK MPU MUX 0.12V TO REF 21 4 1.12V 14 CH5* REF D IN 24 15 CH6* SDO 6 17 CH7* V CC 8 LTC2404/LTC2408 = INTERNAL OSC/50Hz REJECTION 26 = EXTERNAL CLOCK SOURCE 10 F O GND = INTERNAL OSC/60Hz REJECTION 0 8,338,608 16,777,215 2404/08 TA01 1, 5, 6, 16, 18, 22, 27, 28 OUTPUT CODE (DECIMAL) *THESE PINS ARE NO CONNECTS ON THE LTC2404 2404/08 TA02 1 LINEARITY ERROR (ppm) U ULTC2404/LTC2408 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) LTC2404C/LTC2408C .............................. 0 C to 70 C CC Reference Input Voltage to GND .. 0.3V to (V + 0.3V) LTC2404I/LTC2408I ........................... 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 PACKAGE/ORDER INFORMATION ORDER ORDER TOP VIEW TOP VIEW PART NUMBER PART NUMBER 1 GND 1 GND GND 28 GND 28 2 GND 2 GND V 27 V 27 CC CC LTC2404CG LTC2408CG 3 F 3 F V 26 V 26 REF O REF O LTC2404IG LTC2408IG 4 SCK 4 SCK ADCIN 25 ADCIN 25 5 SDO 5 SDO GND 24 GND 24 6 CSADC 6 CSADC GND 23 GND 23 7 GND 7 GND MUXOUT 22 MUXOUT 22 8 D 8 D V 21 V 21 CC IN CC IN 9 CSMUX 9 CSMUX CH0 20 CH0 20 10 CLK 10 CLK CH1 19 CH1 19 11 GND 11 GND CH2 18 CH2 18 12 NC 12 CH7 CH3 17 CH3 17 13 GND 13 GND NC 16 CH4 16 14 NC 14 CH6 NC 15 CH5 15 G PACKAGE G PACKAGE 28-LEAD PLASTIC SSOP 28-LEAD PLASTIC SSOP T = 125 C, q = 130 C/W T = 125 C, q = 130 C/W JMAX JA JMAX JA 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. (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 2 U U W U U WWW