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類比轉數位轉換器 (ADC)
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ADS1257

現行

具有整合式 PGA 的 24 位元、30kSPS、4 通道工業 ADC

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產品規格表

ADS1257

現行
產品規格表 立即訂購

產品詳細資料

Resolution (Bits) 24 Sample rate (max) (ksps) 30 Number of input channels 4 Interface type SPI Architecture Delta-Sigma Input type Differential, Single-ended Multichannel configuration Multiplexed Rating Catalog Reference mode External Input voltage range (max) (V) 5.25 Input voltage range (min) (V) 0 Features 50/60 Hz Rejection, GPIO, PGA Operating temperature range (°C) -40 to 85 Power consumption (typ) (mW) 38 Analog supply voltage (min) (V) 4.75 Analog supply voltage (max) (V) 5.25 Digital supply (min) (V) 1.8 Digital supply (max) (V) 3.6
Resolution (Bits) 24 Sample rate (max) (ksps) 30 Number of input channels 4 Interface type SPI Architecture Delta-Sigma Input type Differential, Single-ended Multichannel configuration Multiplexed Rating Catalog Reference mode External Input voltage range (max) (V) 5.25 Input voltage range (min) (V) 0 Features 50/60 Hz Rejection, GPIO, PGA Operating temperature range (°C) -40 to 85 Power consumption (typ) (mW) 38 Analog supply voltage (min) (V) 4.75 Analog supply voltage (max) (V) 5.25 Digital supply (min) (V) 1.8 Digital supply (max) (V) 3.6
VQFN (RGW) 20 25 mm² (5 mm × 5 mm)
  • 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
  • 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.

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.

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重要文件 類型 標題 格式選項 下載最新的英文版本 日期
* 資料表 ADS1257 30-kSPS, 4-Channel, 24-Bit ADC with PGA in 5-mm × 5-mm VQFN Package datasheet (Rev. B) PDF | HTML 2016/4/19
應用說明 Calculating Conversion Latency and System Cycle Time for Delta-Sigma ADCs (Rev. A) PDF | HTML 2024/3/18
應用說明 A Basic Guide to Bridge Measurements (Rev. A) PDF | HTML 2024/3/13
應用說明 QFN and SON PCB Attachment (Rev. C) PDF | HTML 2023/12/6
應用說明 Digital Filter Types in Delta-Sigma ADCs (Rev. A) PDF | HTML 2023/3/29
電子書 Fundamentals of Precision ADC Noise Analysis (Rev. A) 2020/6/19

設計與開發

如需其他條款或必要資源，請按一下下方的任何標題以檢視詳細頁面 (如有)。

開發板

ADS1256EVM-PDK — ADS1256 性能展示套件

ADS1256EVM-PDK 為一套完整的評估/示範套件，結合 ADS1256EVM 與以 DSP 為基礎的 MMB0 主機板，供個人電腦使用。MMB0 主機板允許 ADS1256EVM 透過 USB 連接埠與電腦連線。ADS1256EVM-PDK 由 ADCPro™ 評估軟體透過外掛程式制。該軟體設計可在 Microsoft™ Windows 作業系統上執行，並可用於對 ADS1256 裝置進行完整評估。

 

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支援軟體

ADS1256-C-EXAMPLE-CODE — ADS1256 example C code

Expedite your embedded design using this example C code for the ADS1256 product family
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支援軟體

SBAC145 — ADS1255-7 Design Calculator

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模擬型號

ADS1257 IBIS MODEL

SLAM276.ZIP (71 KB) - IBIS 模型
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計算工具

ANALOG-ENGINEER-CALC — PC software analog engineer's calculator

類比工程師的計算機旨在加速類比電路設計工程師定期使用的許多重複計算。此基於 PC 的工具提供圖形介面，列出各種常見計算，從使用回饋電阻器設定運算放大器增益到選擇適當的電路設計元件以穩定類比數位轉換器 (ADC) 驅動緩衝電路。

除了作為獨立工具使用外，此計算機還與類比工程師口袋參考中描述的概念相得益彰。

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設計工具

ADC-DAC-TO-VREF-SELECT-DESIGN-TOOL — The ADC-TO-VREF-SELECT tool enables the pairing of TI ADCs, DACs, and series voltage references.

The ADC-TO-VREF-SELECT tool enables the pairing of TI analog-to-digital converters (ADCs) and series voltage references. Users can select an ADC device and the desired reference voltage, and the tool will list up to two voltage reference recommendations.
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VQFN (RGW) 20 Ultra Librarian
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