LTC2301/LTC2305 1-/2-Channel, 12-Bit ADCs 2 with I C Compatible Interface FEATURES DESCRIPTION n 12-Bit Resolution The LTC 2301/LTC2305 are low noise, low power, n Low Power: 1.5mW at 1ksps, 35W Sleep Mode 1-/2-channel, 12-bit successive approximation ADCs 2 n 14ksps Throughput Rate with an I C compatible serial interface. These ADCs include n Internal Reference an internal reference and a fully differential sample-and- n Low Noise: SNR = 73.5dB hold circuit to reduce common mode noise. The LTC2301/ n Guaranteed No Missing Codes LTC2305 operate from an internal clock to achieve a fast n Single 5V Supply 1.3s conversion time. 2 n 2-wire I C Compatible Serial Interface with 9 The LTC2301/LTC2305 operate from a single 5V supply Addresses Plus One Global for Synchronization and draw just 300A at a throughput rate of 1ksps. The n Fast Conversion Time: 1.3s ADC enters nap mode when not converting, reducing the n 1-Channel (LTC2301) and 2-Channel (LTC2305) power dissipation. Versions n The LTC2301/LTC2305 are available in small 12-pin Unipolar or Bipolar Input Ranges (Software 4mm 3mm DFN and 12-pin MSOP packages. The in- Selectable) n ternal 2.5V reference further reduces PCB board space Internal Conversion Clock n requirements. Guaranteed Operation from 40C to 125C (MSOP Package) The low power consumption and small size make the n 12-Pin 4mm 3mm DFN and 12-Pin MSOP LTC2301/LTC2305 ideal for battery operated and portable Packages 2 applications, while the 2-wire I C compatible serial interface makes these ADCs a good match for space-constrained APPLICATIONS systems. n Industrial Process Control 2 12-Bit I C ADC Family n Motor Control Input Channels 1 2 8 n Accelerometer Measurements Part Number LTC2301 LTC2305 LTC2309 n Battery Operated Instruments n L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear Isolated and/or Remote Data Acquisition Technology Corporation. All other trademarks are the property of their respective owners. n Power Supply Monitoring BLOCK DIAGRAM 5V Integral Nonlinearity vs Output Code (LTC2305) 10F 0.1F 1.00 0.75 V LTC2301 DD AD1 LTC2305 0.50 AD0 + 0.25 + CH0(IN ) ANALOG 12-BIT SCL 2 ANALOG INPUT I C INPUT SAR ADC 0.00 0V TO 4.096V UNIPOLAR + PORT MUX CH1(IN ) SDA 2.048V BIPOLAR 0.25 V REF 0.50 INTERNAL 2.2F 2.5V REF 0.75 1.00 PIN NAMES IN PARENTHESES REFCOMP 0 1024 2048 3072 4096 REFER TO LTC2301 GND 0.1F 10F OUTPUT CODE 23015 TA01a 23015 TA01b 23015fb 1 INL (LSB)LTC2301/LTC2305 (Notes 1, 2) ABSOLUTE MAXIMUM RATINGS Supply Voltage (V ) ................................ 0.3V to 6.0V Power Dissipation ...............................................500mW DD Analog Input Voltage (Note 3) Operating Temperature Range + CH0(IN ), CH1(IN ), LTC2301C/LTC2305C ............................... 0C to 70C REF, REFCOMP .............(GND 0.3V) to (V + 0.3V) LTC2301I/LTC2305I .............................. 40C to 85C DD Digital Input Voltage ..........(GND 0.3V) to (V + 0.3V) LTC2301H/LTC2305H (Note 13) ......... 40C to 125C DD Digital Output Voltage .......(GND 0.3V) to (V + 0.3V) Storage Temperature Range ................... 65C to 150C DD PIN CONFIGURATION LTC2305 LTC2301 TOP VIEW TOP VIEW GND 1 12 AD0 GND 1 12 AD0 SDA 2 11 AD1 SDA 2 11 AD1 SCL 3 10 V SCL 3 10 V DD DD 13 13 GND 4 9 GND GND 4 9 GND + CH0 5 8 REFCOMP IN 5 8 REFCOMP CH1 6 7 V IN 6 7 V REF REF DE PACKAGE DE PACKAGE 12-LEAD (4mm 3mm) PLASTIC DFN 12-LEAD (4mm 3mm) PLASTIC DFN T = 150C, = 43C/W T = 150C, = 43C/W JMAX JA JMAX JA EXPOSED PAD (PIN 13) IS GND, MUST BE SOLDERED TO PCB EXPOSED PAD (PIN 13) IS GND, MUST BE SOLDERED TO PCB LTC2305 LTC2301 TOP VIEW TOP VIEW GND 1 12 AD0 GND 1 12 AD0 SDA 2 11 AD1 SDA 2 11 AD1 SCL 3 10 V SCL 3 10 V DD DD GND 4 9 GND GND 4 9 GND + 5 CH0 8 REFCOMP IN 5 8 REFCOMP 6 CH1 7 V IN 6 7 V REF REF MS PACKAGE MS PACKAGE 12-LEAD PLASTIC MSOP 12-LEAD PLASTIC MSOP T = 150C, = 130C/W T = 150C, = 130C/W JMAX JA JMAX JA ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LTC2301CDE PBF LTC2301CDE TRPBF 2301 0C to 70C 12-Lead (3mm 4mm) Plastic DFN LTC2301IDE PBF LTC2301IDE TRPBF 2301 40C to 85C 12-Lead (3mm 4mm) Plastic DFN LTC2305CDE PBF LTC2305CDE TRPBF 2305 0C to 70C 12-Lead (3mm 4mm) Plastic DFN LTC2305IDE PBF LTC2305IDE TRPBF 2305 12-Lead (3mm 4mm) Plastic DFN 40C to 85C LTC2301CMS PBF LTC2301CMS TRPBF 2301 12-Lead Plastic MSOP 0C to 70C LTC2301IMS PBF LTC2301IMS TRPBF 2301 12-Lead Plastic MSOP 40C to 85C LTC2301HMS PBF LTC2301HMS TRPBF 2301 12-Lead Plastic MSOP 40C to 125C LTC2305CMS PBF LTC2305CMS TRPBF 2305 12-Lead Plastic MSOP 0C to 70C 23015fb 2