LTC2436-1 2-Channel Differential Input 16-Bit No Latency DS ADC FEATURES DESCRIPTIO n 2-Channel Differential Input with Automatic The LTC 2436-1 is a 2-channel differential input mi- TM Channel Selection (Ping-Pong) cropower 16-bit No Latency DS analog-to-digital con- n Low Supply Current: 200m A, 4m A in Autosleep verter with an integrated oscillator. It provides 0.5LSB n Differential Input and Differential Reference with INL and 800nV RMS noise independent of V . The two REF GND to V Common Mode Range differential channels convert alternately with a channel CC n 0.12LSB INL, No Missing Codes identification included in the conversion result. It uses n 0.16LSB Full-Scale Error and 0.006LSB Offset delta-sigma technology and provides single conversion n 800nV RMS Noise, Independent of V settling of the digital filter. Through a single pin, the REF n No Latency: Digital Filter Settles in a Single Cycle and LTC2436-1 can be configured for better than 87dB input Each Channel Conversion is Accurate differential mode rejection at 50Hz and 60Hz 2%, or it n Internal OscillatorNo External Components can be driven by an external oscillator for a user defined Required rejection frequency. The internal oscillator requires no n 87dB Min, 50Hz and 60Hz Notch Filter external frequency setting components. n Narrow SSOP-16 Package The converter accepts any external differential reference n Single Supply 2.7V to 5.5V Operation voltage from 0.1V to V for flexible ratiometric and CC n Pin Compatible with the 24-Bit LTC2412 remote sensing measurement configurations. The full- scale differential input range is from 0.5 V to 0.5 U REF APPLICATIO S V . The reference common mode voltage, V , and REF REFCM the input common mode voltage, V , may be indepen- INCM n Direct Sensor Digitizer dently set anywhere between GND and V . The DC CC n Weight Scales common mode input rejection is better than 140dB. n Direct Temperature Measurement n The LTC2436-1 communicates through a flexible 3-wire Gas Analyzers n digital interface which is compatible with SPI and Strain-Gage Transducers TM n MICROWIRE protocols. Instrumentation n , LTC and LT are registered trademarks of Linear Technology Corporation. Data Acquisition No Latency is a trademark of Linear Technology Corporation. n Industrial Process Control MICROWIRE is a trademark of National Semiconductor Corporation. Effective Resolution vs V TYPICAL APPLICATIO REF 90 80 5V REF 70 1F = EXTERNAL CLOCK SOURCE 114 60 = INTERNAL OSC/SIMULTANEOUS 4.9k V F CC O (100mV) 2 50Hz/60Hz REJECTION + 50 REF 4 + CH0 100 40 LTC2436-1 30 5 13 CH0 SCK 20 THERMOCOUPLE 3 12 3-WIRE REF SDO SPI INTERFACE 10 6 + 11 CH1 CS 0 7 0132 4 5 CH1 V (V) 24361 TA02 8, 9, 10, 15, 16 REF GND *COMBINES EFFECTS OF PEAK-TO-PEAK NOISE 24361 TA01 16 AND 16-BIT STEP SIZE (V /2 ) REF 24361f 1 EFFECTIVE RESOLUTION (V)* U DS ULTC2436-1 UUW ABSOLUTE AXI U RATI GS PACKAGE/ORDER I FOR ATIO (Notes 1, 2) TOP VIEW ORDER PART NUMBER Supply Voltage (V ) to GND.......................0.3V to 7V CC 1 16 GND V CC Analog Input Voltage + 2 LTC2436-1CGN 15 GND REF to GND .................................... 0.3V to (V + 0.3V) CC 3 14 F LTC2436-1IGN REF O Reference Input Voltage + 4 13 SCK CH0 to GND .................................... 0.3V to (V + 0.3V) CC 5 12 SDO CH0 Digital Input Voltage to GND ........ 0.3V to (V + 0.3V) CC + 6 11 CS CH1 GN PART MARKING Digital Output Voltage to GND ..... 0.3V to (V + 0.3V) CC 7 10 GND CH1 Operating Temperature Range 8 9 GND GND 24361 LTC2436-1C ............................................ 0 C to 70 C GN PACKAGE 24361I LTC2436-1I ........................................ 40 C to 85 C 16-LEAD PLASTIC SSOP T = 125 C, q = 110 C/W JMAX JA Storage Temperature Range ................. 65 C to 150 C Lead Temperature (Soldering, 10 sec).................. 300 C Consult LTC Marketing for parts specified with wider operating temperature ranges. ELECTRICAL 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 , 0.5 V V 0.5 V , (Note 5) l 16 Bits REF CC REF IN REF + Integral Nonlinearity 5V V 5.5V, REF = 2.5V, REF = GND, V = 1.25V, (Note 6) 0.06 LSB CC INCM + 5V V 5.5V, REF = 5V, REF = GND, V = 2.5V, (Note 6) l 0.12 3 LSB CC INCM + REF = 2.5V, REF = GND, V = 1.25V, (Note 6) 0.30 LSB INCM + Offset Error 2.5V REF V , REF = GND, l 0.006 1 LSB CC + = IN V , (Note 13) GND IN CC + Offset Error Drift 2.5V REF V , REF = GND, 10 nV/ C CC + GND IN = IN V CC + Positive Full-Scale Error 2.5V REF V , REF = GND, l 0.16 3 LSB CC + + + IN = 0.75REF , IN = 0.25 REF + Positive Full-Scale Error Drift 2.5V REF V , REF = GND, 0.03 ppm of V / C CC REF + + + IN = 0.75REF , IN = 0.25 REF + Negative Full-Scale Error 2.5V REF V , REF = GND, l 0.16 3 LSB CC + + + IN = 0.25 REF , IN = 0.75 REF + Negative Full-Scale Error Drift 2.5V REF V , REF = GND, 0.03 ppm of V / C CC REF + + + IN = 0.25 REF , IN = 0.75 REF + Total Unadjusted Error 5V V 5.5V, REF = 2.5V, REF = GND, V = 1.25V 0.20 3 LSB CC INCM + 5V V 5.5V, REF = 5V, REF = GND, V = 2.5V 0.20 3 LSB CC INCM + REF = 2.5V, REF = GND, V = 1.25V, (Note 6) 0.25 3 LSB INCM + Output Noise 5V V 5.5V, REF = 5V, REF = GND, 0.8 m V CC RMS + GND IN = IN V , (Note 13) CC 24361f 2 U WWW