ADS1257
- Up to 23-Bits Noise-Free Resolution
- Small 5-mm × 5-mm VQFN Package
- 4 Analog Inputs
- 2 Differential or 3 Single-Ended Measurements
- Excellent DC Performance
- Offset Drift: 4 nV/°C (Gain = 64)
- Gain Drift: 0.8 ppm/°C
- Nonlinearity: 3 ppm (Gain = 1)
- Programmable Data Rates: 2.5 SPS to 30 kSPS
- Single-Cycle Settled Conversions (≤ 1000 SPS)
- 50-Hz and 60-Hz Rejection
- High Impedance Input Buffer
- Differential-Input PGA
- Integrated Sensor Break Detection
- 2 General-Purpose Input/Outputs
- Power Supplies:
- Analog: 5 V
- Digital: 1.8 V to 3.6 V
- 5-V Tolerant SPI™-Compatible Serial Interface
The ADS1257 is a low-noise, 30-kSPS, 24-bit, delta-sigma (ΔΣ) analog-to-digital converter (ADC) with an integrated multiplexer (mux), input buffer, and programmable gain amplifier (PGA) in a small 20-pin, 5-mm × 5-mm VQFN package. The combination of integration, high conversion rate, and 24-bit resolution together in a small package makes the device ideally suited for space-constrained applications.
The input multiplexer accepts either two differential or three single-ended input measurements. The sensor-break detection circuit verifies the input connection continuity to the ADC. The selectable input buffer greatly increases the input impedance, and in many cases, eliminates the need for external buffers. The buffer input voltage range includes AGND. The low-noise PGA provides gains from 1 to 64 to accommodate a wide range of inputs signals. The programmable digital filter optimizes ADC resolution (up to 23 bits noise-free) and conversion rates (up to 30 kSPS). The digital filter provides single-cycle settled conversions, and rejection of 50-Hz and 60-Hz interference signals.
The SPI-compatible serial interface operates with as little as three wires, simplifying connections to external controllers. Integrated calibration features support both self and system correction of offset and gain errors for all PGA gain settings. Two bidirectional digital I/Os pins control external circuits.
Technical documentation
Type | Title | Date | ||
---|---|---|---|---|
* | Data sheet | ADS1257 30-kSPS, 4-Channel, 24-Bit ADC with PGA in 5-mm × 5-mm VQFN Package datasheet (Rev. B) | PDF | HTML | 19 Apr 2016 |
Application note | Calculating Conversion Latency and System Cycle Time for Delta-Sigma ADCs (Rev. A) | PDF | HTML | 18 Mar 2024 | |
Application note | A Basic Guide to Bridge Measurements (Rev. A) | PDF | HTML | 13 Mar 2024 | |
Application note | QFN and SON PCB Attachment (Rev. C) | PDF | HTML | 06 Dec 2023 | |
Application note | Digital Filter Types in Delta-Sigma ADCs (Rev. A) | PDF | HTML | 29 Mar 2023 | |
E-book | Fundamentals of Precision ADC Noise Analysis | 19 Jun 2020 |
Design & development
For additional terms or required resources, click any title below to view the detail page where available.
ADS1256EVM-PDK — ADS1256 Performance Demonstration Kit
The ADS1256EVM-PDK is a complete evaluation/demonstration kit, which combines the ADS1256EVM with the DSP-based MMB0 motherboard for use with a personal computer. The MMB0 motherboard allows the ADS1256EVM to connect to a computer via a USB port. The ADS1256EVM-PDK is controlled by the (...)
SBAC145 — ADS1255-7 Design Calculator
Supported products & hardware
Products
Precision ADCs
Hardware development
Evaluation board
ANALOG-ENGINEER-CALC — PC software analog engineer's calculator
The analog engineer’s calculator is designed to speed up many of the repetitive calculations that analog circuit design engineers use on a regular basis. This PC-based tool provides a graphical interface with a list of various common calculations ranging from setting operational-amplifier (...)
Supported products & hardware
Products
Precision op amps (Vos<1mV)
General-purpose op amps
Audio op amps
Transimpedance amplifiers
High-speed op amps (GBW ≥ 50 MHz)
Power op amps
Video amplifiers
Line drivers
Transconductance amplifiers & laser drivers
Fully differential amplifiers
Precision ADCs
Biosensing AFEs
High-speed ADCs (≥10 MSPS)
Receivers
Touchscreen controllers
Difference amplifiers
Instrumentation amplifiers
Audio line receivers
Analog current-sense amplifiers
Digital power monitors
Analog current-sense amplifiers with integrated shunt resistor
Digital power monitors with integrated shunt resistor
Die & wafer services
PSPICE-FOR-TI — PSpice® for TI design and simulation tool
TINA-TI — SPICE-based analog simulation program
Package | Pins | CAD symbols, footprints & 3D models |
---|---|---|
VQFN (RGW) | 20 | Ultra Librarian |
Ordering & quality
- RoHS
- REACH
- Device marking
- Lead finish/Ball material
- MSL rating/Peak reflow
- MTBF/FIT estimates
- Material content
- Qualification summary
- Ongoing reliability monitoring
- Fab location
- Assembly location
Recommended products may have parameters, evaluation modules or reference designs related to this TI product.
Support & training
TI E2E™ forums with technical support from TI engineers
Content is provided "as is" by TI and community contributors and does not constitute TI specifications. See terms of use.
If you have questions about quality, packaging or ordering TI products, see TI support.