ADS1257 - 超低噪声 24 位 ADC

ADS1257是TI德州仪器公司的一款精密ADC(<=10MSPS)产品，ADS1257是超低噪声 24 位 ADC，本站介绍了ADS1257的封装应用图解、特点和优点、功能等，并给出了与ADS1257相关的TI元器件型号供参考。

ADS1257 - 超低噪声 24 位 ADC - 精密ADC(<=10MSPS) - 模数转换器 - 德州仪器

产品特性

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

产品应用

Factory Automation and Process Control
Test and Measurement
Medical Equipment
Scientific Instrumentation

产品说明

The ADS1257 is a low-noise, 30-kSPS, 24-bit, delta-sigma (ΔΣ) analog-to-digital converter (ADC) with an integrated multiplexer, 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 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 (from ±78 mV to ±5 V). 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.

产品器件信息

PART NUMBER	PACKAGE	BODY SIZE (NOM)
ADS1257	VQFN (20)	5.00 mm × 5.00 mm

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