12-BIT SAR ADC LTC2309 8-Channel, 12-Bit SAR ADC 2 with I C Interface Fe Aut Rse Dse CRItp IOn n 12-Bit Resolution The LTC 2309 is a low noise, low power, 8-channel, 12-bit 2 n Low Power: 1.5mW at 1ksps, 35W Sleep Mode successive approximation ADC with an I C compatible n 14ksps Throughput Rate serial interface. This ADC includes an internal reference n Low Noise: SNR = 73.4dB and a fully differential sample-and-hold circuit to reduce n Guaranteed No Missing Codes common mode noise. The LTC2309 operates from an n Single5V Supply internal clock to achieve a fast1.3s conversion time. 2 n 2-Wire I C CompatibleSerial Inter face withNine The LTC2309 operates from a single 5V supply and Addresses Plus OneGlobal for Synchronization draws just 300A at a throughput rate of 1ksps. The n FastConversion Time: 1.3s ADC enters nap mode when not converting, reducing n Internal Reference the power dissipation. n Internal 8-Channel Multiplexer n The LTC2309 is available in both a small 24-pin 4mm Internal Conversion Clock n 4mm QFN and a 20-pin TSSOP package. The internal 2.5V Unipolar or Bipolar Input Ranges (Software Selectable) n reference and 8-channel multiplexer further reduce PCB Guaranteed Operation from 40C to 125C boardspace requirements. (TSSOP Package) n 24-Pin 4mm 4mm QFN and 20-Pin TSSOP Packages The low power consumption and small size make the LTC2309 ideal for battery-operated and portable applica- App LICAt IOsn 2 tions, while the 2-wire I C compatible serial interface makes n thisADC a goodmatch for space-constrainedsystems. IndustrialProcess Control n L,L T, LTC, LTM, Linear Technology andthe Linear logo are registered trademarksand Motor Control EasyDrive is a trademark of Linear Technology Corporation. All othertrademarks arethe n AccelerometerMeasurements propertyof their respective owners. n Battery-OperatedInstruments n Isolated and/or RemoteData Acquisition n Power Supply Monitoring BLOCK DIAGRAM 5V Integral Nonlinearity vs Output Code 0.1F 10F 1.00 V 0.75 DD CH0 AD1 LTC2309 AD0 0.50 CH1 CH2 0.25 ANALOG CH3 SCL + 2 ANALOG INPUTS I C INPUT 0 CH4 PORT 0V TO 4.096V UNIPOLAR MUX SDA 2.048V BIPOLAR 0.25 CH5 CH6 0.50 V REF CH7 INTERNAL 2.2F 0.75 2.5V REF COM 1.00 0 1024 2048 3072 4096 OUTPUT CODE REFCOMP 2309 G01 GND 0.1F 10F 2309 TA01 2309fd INL (LSB)LTC2309 ABs OL etu M Ax IMu M RAt In Gs (Notes 1, 2) Supply Voltage Power Dissipation .............................................. 500mW V .......................................................... 0.3V to 6V Operating TemperatureR ange DD Analog InputV oltage( Note 3) LTC2309C ................................................ 0C to 70C CH0-CH7,CO M,V , LTC2309I .............................................40C to 85C REF REFCOMP .................... (GND 0 .3V) to (V + 0.3V) LTC2309H .......................................... 40C to 125C DD DigitalI nputV oltage Storage TemperatureR ange .................. 65C to 150C (Note3 ) ............................ (GND 0.3V) to (V +0 .3V) Lead Temperature (Soldering, 10s ec) DD Digital Output Voltage ...... (GND 0 .3V) to (V +0 .3V) TSSOP ..............................................................300C DD Ip n C On FIGu RAt IOn TOP VIEW TOP VIEW REFCOMP 1 20 V REF 24 23 22 21 20 19 GND 2 19 COM CH3 1 18 GND V 3 18 CH7 DD CH4 2 17 SDA AD0 4 17 CH6 CH5 3 16 SCL 25 AD1 5 16 CH5 CH6 4 15 AD1 SCL 6 15 CH4 CH7 5 14 AD0 SDA 7 14 CH3 COM 6 13 V DD GND 8 13 CH2 7 8 9 10 11 12 GND 9 12 CH1 V 10 11 CH0 DD F PACKAGE UF PACKAGE 20-LEAD PLASTIC TSSOP 24-LEAD (4mm s 4mm) PLASTIC QFN T = 150C, =90C/W , = 20C/W JMAX JA JC T = 150C, = 37C/W JMAX JA EXPOSED PAD(PIN 25) IS GND, MUSTBE SOLDERED TOPCB ORDe R In FORMAt IOn LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LTC2309CUF PBF LTC2309CUF TRPBF 2309 0C to 70C 24-Lead(4mm 4mm)Plastic QFN LTC2309IUF PBF LTC2309IUF TRPBF 2309 24-Lead (4mm 4mm) Plastic QFN 40C to 85C LTC2309CF PBF LTC2309CF TRPBF LTC2309F 20-Lead Plastic TSSOP 0C to 70C LTC2309IF PBF LTC2309IF TRPBF LTC2309F 20-Lead Plastic TSSOP 40C to 85C LTC2309HF PBF LTC2309HF TRPBF LTC2309F 20-Lead Plastic TSSOP 40C to 125C Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container. Consult LTC Marketing for information onnon-standard lead based finish parts. Formore information onlead free part marking, go to: