ADS1220 Sensors: Price, Package and Datasheet

The ADS1220 is a precision, 24-bit, analog-to-digital converter (ADC) offered in a leadless QFN-16 or a TSSOP-16 package. The device features two differential or four single-ended inputs through a very flexible input multiplexer (mux), a low-noise, programmable gain amplifier (PGA), two programmable excitation current sources, an internal reference, an oscillator, a low-side bridge switch, and a precision temperature sensor. 

The many integrated features and the simple control of the ADS1220 through an SPI-compatible interface ease precision measurements of the most common sensor signals.  The device can perform conversions at data rates of up to 2000 samples-per-second (SPS) with single- cycle settling. 

The internal PGA offers gains of up to 128 V/V. This PGA makes the ADS1220 ideally suited for applications measuring small signals, such as thermocouples, resistance temperature detectors (RTDs), thermistors, and bridge sensors. The device supports true bipolar analog supplies in the event that single-ended signals referenced to ground must be measured using the PGA. 

Alternatively, the device can be configured to bypass the internal PGA while still providing gains of up to 4 V/V, allowing for rail-to- rail input signals with no loss of signal integrity when running from a single analog supply.  The device operates in either duty-cycle mode (consuming 120 µA of current), normal mode (consuming 415 µA of current), or turbo mode (for highest data rates). The ADS1220 operates over a temperature range of –40°C to +125°C.  

The figure above shows the pinouts of the ADS1220 integrated circuit packages. The 16-pin TSSOP (Thin Shrink Small Outline Package) package is bigger than QFN packages. It has a chip body of around 5.1mm x 4.5mm.

Symbol

Footprint

3D Model

● Low Current Consumption:

– Duty-Cycle Mode: 120 μA

– Normal Mode: 415 μA

● Wide Supply Range: 2.3 V to 5.5 V

● Programmable Gain: 1 V/V to 128 V/V

● Programmable Data Rates: Up to 2 kSPS

● 50-Hz and 60-Hz noise Rejection at 20 SPS

● Low-Noise PGA: 90 nVRMS at 20 SPS

● Dual Matched Programmable Current Sources:

● 10 μA to 1500 μA

● Internal Temperature Sensor: 0.5°C Error (max)

● Low-Drift Internal Reference

● Low-Drift Internal Oscillator

● Two Differential or Four Single-Ended Inputs

● SPI™-Compatible Interface

● 3,5 mm × 3,5 mm × 0,9 mm QFN Package

● 24-bits resolution (20-bits ENOB or effective resolution)

Texas Instruments ADS1220IPW technical specifications, attributes, parameters and parts with similar specifications to Texas Instruments ADS1220IPW.

●Used in Temperature Sensors:

– Thermocouples

– Resistance Temperature Detectors (RTDs)

– 2-, 3-, and 4-Wire RTD Excitation

●Used in Bridge Sensors

●Used in Portable Instrumentation

●Used in Factory Automation and Process Control

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