超小型、低消費電力、24 ビット、AD コンバータ、SPI
製品の詳細
パラメータ
パッケージ｜ピン｜サイズ
特長
- Low Current Consumption:
As Low as 120 µA (typ) in Duty-Cycle Mode - 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
- Up to 20-Bits Effective Resolution
- Simultaneous 50-Hz and 60-Hz Rejection at
20 SPS with Single-Cycle Settling Digital Filter - Two Differential or Four Single-Ended Inputs
- Dual Matched Programmable Current Sources:
10 µA to 1.5 mA - Internal 2.048-V Reference: 5 ppm/°C (typ) Drift
- Internal 2% Accurate Oscillator
- Internal Temperature Sensor:
0.5°C (typ) Accuracy - SPI-Compatible Interface (Mode 1)
- Package: 3.5-mm × 3.5-mm × 0.9-mm VQFN
概要
The ADS1220 is a precision, 24-bit, analog-to-digital converter (ADC) that offers many integrated features to reduce system cost and component count in applications measuring small sensor signals. The device features two differential or four single-ended inputs through a flexible input multiplexer (MUX), a low-noise, programmable gain amplifier (PGA), two programmable excitation current sources, a voltage reference, an oscillator, a low-side switch, and a precision temperature sensor.
The device can perform conversions at data rates up to 2000 samples-per-second (SPS) with single-cycle settling. At 20 SPS, the digital filter offers simultaneous 50-Hz and 60-Hz rejection for noisy industrial applications. The internal PGA offers gains up to 128 V/V. This PGA makes the ADS1220 ideally-suited for applications measuring small sensor signals, such as resistance temperature detectors (RTDs), thermocouples, thermistors, and resistive bridge sensors. The device supports measurements of pseudo- or fully-differential signals when using the PGA. Alternatively, the device can be configured to bypass the internal PGA while still providing high input impedance and gains up to 4 V/V, allowing for single-ended measurements.
Power consumption is as low as 120 µA when operating in duty-cycle mode with the PGA disabled. The ADS1220 is offered in a leadless VQFN-16 or a TSSOP-16 package and is specified over a temperature range of –40°C to +125°C.
技術資料
設計と開発
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概要
The ADS1220EVM is an evaluation system for the ADS1220, a 24-bit, multi-channel, delta-sigma (ΔΣ) analog-to-digital converter (ADC). The EVM uses the ADS1220 along with minimal circuitry to demonstrate functionality for prototyping and part evaluation. The pins of the ADS1220 are (...)
特長
- Contains all support circuitry needed for the ADS1220
- +5V or +3.3V power-supply options for ADC
- Voltage reference options: external or on-board
- Easy-to-use evaluation software for Microsoft™ Windows XP and Windows 7
- Built-in analysis tools including scope, FFT, and histogram displays
- Data collection to (...)
概要
PLABS-SAR-EVM-PDK is an experimental platform used in conjunction with TI Precision Labs videos to gain a deeper understanding of successive approximation register (SAR) analog-to-digital converter (ADC) circuits. The evaluation module (EVM) platform contains two channels for common SAR (...)
特長
- Intuitive setup – PCB overlay shows the schematic
- No external power supply required
- Includes several coupon boards with different driving amplifier RC filters to facilitate experimentation
- Ships with PHI controller - provides convenient interface to EVM over USB 2.0 (or higher) for power delivery (...)
ソフトウェア開発
設計ツールとシミュレーション
特長
- A/D コンバータ（ADC）と D/A コンバータ（DAC）の回路設計を迅速化
- ノイズの計算
- 一般的な単位変換
- アンプ回路設計の一般的な問題を解決
- 標準的な抵抗を使用してゲインを選択
- フィルタの構成
- 一般的なアンプ構成の総ノイズ
- PCB 寄生成分の計算（R、L、C など）
- 一般的なセンサのセンサ出力値の算定（RTD、熱電対など）
- 受動回路の一般的な問題を解決（受動部品を使用する電圧デバイダなど）
リファレンス・デザイン
CAD/CAE シンボル
| パッケージ | ピン数 | ダウンロード |
|---|---|---|
| TSSOP (PW) | 16 | オプションの表示 |
| VQFN (RVA) | 16 | オプションの表示 |