Overview
The ADS1252U/2K5 is a precision, wide dynamic range, delta-sigma Analog-to-Digital (A/D) converter produced by Texas Instruments. It operates with 24-bit resolution from a single +5V supply and is designed for high-resolution measurement applications. The delta-sigma architecture ensures 24 bits of no missing code performance and achieves an effective resolution of 19 bits with 2.5ppm of rms noise at conversion rates up to 40kHz. This converter is particularly suited for applications requiring high accuracy and low noise, such as cardiac diagnostics, smart transmitters, industrial process control, weight scales, chromatography, and portable instrumentation.
Key Specifications
| Parameter | Conditions | Min | Max | Units | |
|---|---|---|---|---|---|
| Full-Scale Input Voltage | 0 | ±VREF | V | ||
| Absolute Input Voltage | +VIN or –VIN to GND | –0.3 | VDD | V | |
| Differential Input Impedance | CLK = 3.84kHz | 125 | 480kΩ (CLK = 1MHz), 30kΩ (CLK = 16MHz) | MΩ | |
| Input Capacitance | 20 | pF | |||
| Input Leakage | At +25°C | 5 | 50 | 1nA (At TMIN to TMAX) | pA |
| Data Rate | 41.7 | kHz | |||
| Bandwidth | –3dB | 9 | kHz | ||
| Serial Clock (SCLK) | 16 | MHz | |||
| System Clock Input (CLK) | 16 | MHz | |||
| Integral Nonlinearity (INL) | 0.0015% | % |
Key Features
- 24-bit resolution with no missing codes
- Effective resolution of 19 bits up to 40kHz data rate
- Low noise: 2.5ppm of rms noise
- Differential inputs
- Integral Nonlinearity (INL): 0.0015% (max)
- External reference voltage (0.5V to 5V)
- Power-down mode
- Sync mode
- Flexible, 2-wire synchronous serial interface
Applications
- Cardiac diagnostics
- Direct thermocouple interfaces
- Blood analysis
- Infrared pyrometers
- Liquid/gas chromatography
- Precision process control
- Smart transmitters
- Industrial process control
- Weight scales
- Portable instrumentation
Q & A
- What is the resolution of the ADS1252U/2K5? The ADS1252U/2K5 has a 24-bit resolution with no missing codes.
- What is the effective resolution at 40kHz data rate? The effective resolution is 19 bits with 2.5ppm of rms noise.
- What is the input voltage range for the ADS1252U/2K5? The bipolar input voltage range is from –4.096V to +4.096V.
- What is the power supply requirement for the ADS1252U/2K5? It operates from a single +5V supply.
- What are the key applications of the ADS1252U/2K5? It is used in cardiac diagnostics, smart transmitters, industrial process control, weight scales, chromatography, and portable instrumentation.
- What is the package type and pin count of the ADS1252U/2K5? It is offered in an SO-8 package.
- What is the operating temperature range of the ADS1252U/2K5? The operating temperature range is –40°C to +85°C.
- Does the ADS1252U/2K5 have a power-down mode? Yes, it has a power-down mode that can be activated by holding the SCLK high for a specified number of DOUT/DRDY periods.
- What type of serial interface does the ADS1252U/2K5 use? It uses a flexible, 2-wire synchronous serial interface.
- What is the typical noise performance of the ADS1252U/2K5? It has a low noise performance of 2.5ppm of rms noise.
