MCP3422/3/4 18-Bit, Multi-Channel Analog-to-Digital Converter with 2 I C Interface and On-Board Reference Features Description 18-bit ADC with Differential Inputs: The MCP3422, MCP3423 and MCP3424 devices (MCP3422/3/4) are the low noise and high accuracy - 2 channels: MCP3422 and MCP3423 18-Bit delta-sigma analog-to-digital ( A/D) converter - 4 channels: MCP3424 family members of the MCP342X series from Microchip Differential Input Full Scale Range: -V to REF Technology Inc. These devices can convert analog +V REF inputs to digital codes with up to 18 bits of resolution. Self Calibration of Internal Offset and Gain per The on-board 2.048V reference voltage enables an Each Conversion input range of 2.048V differentially (full scale On-Board Voltage Reference (V ): REF range = 4.096V/PGA). - Accuracy: 2.048V 0.05% These devices can output analog-to-digital conversion - Drift: 15 ppm/C results at rates of 3.75, 15, 60, or 240 samples per On-Board Programmable Gain Amplifier (PGA): second depending on the user controllable 2 - Gains of 1, 2, 4 or 8 configuration bit settings using the two-wire I C serial interface. During each conversion, the device INL: 10 ppm of Full Scale Range calibrates offset and gain errors automatically. This Programmable Data Rate Options: provides accurate conversion results from conversion - 3.75 SPS (18 bits) to conversion over variations in temperature and power - 15 SPS (16 bits) supply fluctuation. - 60 SPS (14 bits) The user can select the PGA gain of x1, x2, x4, or x8 - 240 SPS (12 bits) before the analog-to-digital conversion takes place. One-Shot or Continuous Conversion Options This allows the MCP3422/3/4 devices to convert a very Low Current Consumption: weak input signal with high resolution. - 135 A typical The MCP3422/3/4 devices have two conversion (V = 3V, Continuous Conversion) DD modes: (a) One-Shot Conversion mode and (b) - 36 A typical Continuous Conversion mode. In One-Shot conversion (V = 3V, One-Shot Conversion with 1 SPS) mode, the device performs a single conversion and DD enters a low current standby mode automatically until it On-Board Oscillator 2 receives another conversion command. This reduces I C Interface: current consumption greatly during idle periods. In - Standard, Fast and High Speed Modes Continuous conversion mode, the conversion takes - User configurable two external address pins place continuously at the set conversion speed. The for MCP3423 and MCP3424 device updates its output buffer with the most recent Single Supply Operation: 2.7V to 5.5V conversion data. Extended Temperature Range: -40C to +125C The devices operate from a single 2.7V to 5.5V power 2 supply and have a two-wire I C compatible serial Typical Applications interface for a standard (100 kHz), fast (400 kHz), or high-speed (3.4 MHz) mode. Portable Instrumentation and Consumer Goods 2 The I C address bits for the MCP3423 and MCP3424 Temperature Sensing with RTD, Thermistor, and 2 are selected by using two external I C address Thermocouple selection pins (Adr0 and Adr1). The user can configure Bridge Sensing for Pressure, Strain, and Force the device to one of eight available addresses by Weigh Scales connecting these two address selection pins to V , DD 2 Battery Fuel Gauges V or float. The I C address bits of the MCP3422 are SS programmed at the factory during production. Factory Automation Equipment 2009 Microchip Technology Inc. DS22088C-page 1MCP3424 MCP3423 MCP3422 MCP3422/3/4 The MCP3422 and MCP3423 devices have two The MCP3422 is available in 8-pin SOIC, DFN, and differential input channels and the MCP3424 has four- MSOP packages. The MCP3423 is available in 10-pin differential input channels. All electrical properties of DFN, and MSOP packages. The MCP3424 is available in 14-pin SOIC and TSSOP packages. these three devices are the same except the 2 differences in the number of input channels and I C address bit selection options. Package Types MCP3424 MCP3422 MCP3423 SOIC, TSSOP MSOP, SOIC MSOP CH1+ 1 14 CH1+ CH4- CH1+ 10 Adr1 8 CH2- 1 1 CH1- CH1- 2 13 CH1- 2 9 Adr0 CH4+ 7 2 CH2+ V 3 SCL 12 V 8 3 3 6 V SS CH2+ CH3- DD SS CH2+ 4 7 SDA 4 5 SCL SDA CH2- 4 11 CH3+ V CH2- 5 6 DD 5 V 10 Adr1 SS 6 9 V Adr0 DD MCP3422 MCP3423 7 8 SDA SCL 2x3 DFN* 3x3 DFN* CH1+ 1 8 CH2- CH1+ 1 10 Adr1 CH1- 2 7 CH2+ EP CH1- 2 9 Adr0 EP 9 V 3 6 V V 3 8 SCL DD SS SS 11 SDA 4 5 SCL CH2+ SDA 4 7 CH2- 5 6 V DD * Includes Exposed Thermal Pad (EP) see Table 3-1. Functional Block Diagram V V DD SS MCP3422 Voltage Reference (2.048V) V REF CH1+ SCL 2 I C ADC CH1- PGA Converter SDA Interface CH2+ Gain = 1,2,4, or 8 CH2- Clock Oscillator DS22088C-page 2 2009 Microchip Technology Inc. MUX