Overview
The ADS1222IPWT is a 24-bit, delta-sigma analog-to-digital (A/D) converter produced by Texas Instruments. It features a 2-channel differential input multiplexer and is packaged in a 14-pin TSSOP (PW) package. This converter is designed for high-resolution measurements, particularly in portable and power-constrained applications. It combines a delta-sigma modulator with a digital filter to provide low-noise digital output. The ADS1222IPWT supports an analog supply range of 2.7V to 5.5V and operates within a temperature range of -40°C to 85°C, making it suitable for a variety of demanding environments.
Key Specifications
| Specification | Value |
|---|---|
| Number of Channels | 2 |
| Converter Resolution | 24-bit |
| Sampling Speed | 240 SPS (with 4MHz clock) |
| Effective Resolution | 20-bit |
| Differential Input Range | ±5V |
| Integral Non-Linearity (INL) | 0.0003% (typ), 0.0015% (max) |
| Operating Voltage | 2.7V to 5.5V |
| Operating Temperature Range | -40°C to 85°C |
| Package Type | TSSOP-14 |
| Interface | Simple 2-Wire Serial Interface |
| Current Consumption | 300µA (typical) |
| Standby Mode Power Consumption | <1µW |
Key Features
- Input Multiplexer with Two Differential Channels
- Pin-Selectable, High-Impedance Input Buffer
- Self-Calibrating
- On-Chip Temperature Sensor
- Single Conversions with Standby Mode to reduce power consumption
- Low Current Consumption: 300µA
- Simple 2-Wire Serial Interface for control and data retrieval
- Support for multiple devices to create a synchronously sampling multichannel measurement system
Applications
- Hand-Held Instrumentation
- Portable Medical Equipment
- Industrial Process Control
- Weigh Scales
Q & A
- What is the resolution of the ADS1222IPWT?
The ADS1222IPWT has a 24-bit resolution with an effective resolution of 20 bits.
- What is the sampling speed of the ADS1222IPWT?
The sampling speed is 240 samples per second (SPS) with a 4MHz clock.
- What is the differential input range of the ADS1222IPWT?
The differential input range is ±5V.
- How does the ADS1222IPWT manage power consumption?
The ADS1222IPWT has a low current consumption of 300µA and can enter a standby mode where power consumption is less than 1µW.
- What interface does the ADS1222IPWT use?
The ADS1222IPWT uses a simple 2-wire serial interface for control and data retrieval.
- Can multiple ADS1222IPWT devices be connected together?
Yes, multiple ADS1222IPWT devices can be connected to create a synchronously sampling multichannel measurement system.
- What is the operating temperature range of the ADS1222IPWT?
The operating temperature range is -40°C to 85°C.
- Does the ADS1222IPWT have an on-chip temperature sensor?
Yes, the ADS1222IPWT includes an on-chip temperature sensor.
- How does the input multiplexer work in the ADS1222IPWT?
The input multiplexer allows selection between two separate differential input channels, controlled by the MUX pin.
- What is the typical power consumption of the ADS1222IPWT in 3V operation?
The typical power consumption is less than 1mW in 3V operation.
