ADS7813UB/1K - 16-Bit 40kHz SAR ADC, Serial, SOIC-16 | Texas Instruments
部品番号: ADS7813UB/1K ✓ 生産中| 数量 | 単価 | 小計 |
|---|---|---|
| 1 | $16.55 | $16.55 |
| 10 | $14.9 | $149.00 |
| 100 | $12.5 | $1,250.00 |
| 500 | $10.95 | $5,475.00 |
| 1,000 | $9.85 | $9,850.00 |
ADS7813UB/1K 概要
What is a SAR ADC? A successive-approximation-register analog-to-digital converter is a precision data converter that uses an internal binary-search algorithm to convert an analog input into a digital code over a fixed number of clock cycles. SAR ADCs sit in the broader signal-chain hierarchy of sensor front end -> analog front end -> ADC -> digital processor, and they are valued for their deterministic latency, excellent DC linearity, low power, and small size compared to delta-sigma or pipeline converters. The ADS7813UB/1K is pin-compatible with the 12-bit ADS7812, allowing a single PCB layout to serve both precision grades.
Key differentiating features include: 20 microseconds max conversion time (50 kHz internal oscillator), no missing codes at 16 bits, SPI/QSPI/MICROWIRE-compatible serial interface synchronizable to an internal or external clock, a high-impedance analog input stage capable of 10V input span when using an external 5V reference, and a power-down mode that reduces quiescent current between conversions for battery-friendly operation. Internal self-calibration of linearity and offset is performed at power-up. According to TI's product page, the part is rated for the industrial -40C to +85C temperature range.
The device integrates an input sample-and-hold, a precision capacitor-based SAR core, an internal 2.5V reference (with optional external reference override), and a serial output engine. The low-noise architecture and 100 dB typical SNR (when using the internal reference and 0-5V input) make it suitable for precision instrumentation where DC accuracy is paramount. The 16-pin SOIC package ensures compatibility with industry-standard SMT assembly lines and hand-solderable prototype rework.
Typical applications include industrial process control loop measurement (4-20 mA or 0-10V transducer digitization), precision weigh scales and load-cell digitizers, portable battery-powered data loggers, isolated sensor front ends, multi-channel multiplexed data acquisition boards paired with an external analog mux, and medical instrumentation signal chains. The wide input range (with 5V reference) supports direct connection to bridge sensors and instrumentation-amp outputs.
Design consideration: ensure the source impedance at the analog input is low (below 1 kOhm recommended) to avoid gain error and settling issues caused by the input sampling capacitor; add an external RC anti-alias filter. The internal reference is trimmed but can be overridden with an external 2.5V or 5V reference for better absolute accuracy or ratiometric measurements.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone.
ドロップイン代替品: ADS7813UB/1K — 同一パッケージでピン互換。PCBの作り直しが必要な異なるパッケージの部品は除外されています。
このシリーズのバリエーション
同一シリーズでドロップイン互換のモデル: ADS7813UB/1K （同一形状・フットプリント） — 相違点: Package, Data Interface, Architecture, RoHS Status, Operating Temperature.
クイック比較ツール — 並列比較する代替部品を選択:
ADS7813UBG4
✅ ドロップイン📋 参考代替品（カタログ未掲載）
ADS7813U/1K
✅ ドロップイン📋 参考代替品（カタログ未掲載）
ADS7813UG4
✅ ドロップイン📋 参考代替品（カタログ未掲載）
ADS7813PB
✅ ドロップイン📋 参考代替品（カタログ未掲載）
ADS7813U
✅ ドロップイン📋 参考代替品（カタログ未掲載）
ADS7812U
✅ ドロップイン📋 参考代替品（カタログ未掲載）
ADS7813UB/1K 最大定格＆電気的特性
| 分解能 | 16 bit |
| Sample Rate (Max) | 40 kSPS |
| Conversion Time (Max) | 20 us |
| Architecture | SAR (Successive Approximation) |
| Number of Channels | 1 (single-ended) |
| Input Type | Single-Ended, Unipolar |
| Analog Input Voltage (Max) | 10 V (with 5V external reference) |
| Supply Voltage (Nominal) | 5 V |
| Supply Voltage Range | 4.75 V to 5.25 V |
| Reference | Internal 2.5V or External |
| インターフェース | Serial SPI/QSPI/MICROWIRE-compatible |
| 動作温度 | -40C to +85C (Industrial) |
| パッケージ | 16-SOIC (DW) |
| 実装タイプ | Surface Mount |
| ピン数 | 16 |
| Power-Down Mode | Yes |
| Pin-Compatible With | ADS7812 (12-bit) |
| RoHS ステータス | Compliant |
| Packaging Quantity | 1000 (Tape & Reel, /1K suffix) |
ADS7813UB/1K ピン構成
| ピン 1 | VREF — Reference voltage input/output (internal 2.5V reference; bypass with 2.2 uF cap) |
| ピン 2 | ANALOG IN — Analog input (single-ended, 0V to VREF or 0V to 2x VREF with 5V ref) |
| ピン 3 | GND — Analog ground |
| ピン 4 | NC — Not connected (per datasheet) |
| ピン 5 | NC — Not connected (per datasheet) |
| ピン 6 | CS — Chip select (active low, enables serial interface) |
| ピン 7 | DCLOCK — Serial data clock input (SPI clock) |
| ピン 8 | DOUT — Serial data output (16-bit conversion result) |
| ピン 9 | TAG — Tag input (low = current conversion; high = next conversion) |
| ピン 10 | CONV — Conversion start input (high-to-low edge initiates conversion) |
| ピン 11 | BUSY — Busy output (high during conversion) |
| ピン 12 | DGND — Digital ground |
| ピン 13 | NC — Not connected (per datasheet) |
| ピン 14 | NC — Not connected (per datasheet) |
| ピン 15 | VCC — +5V analog supply |
| ピン 16 | VCC — +5V analog supply |
主な用途
ADS7813UB/1K の用途: 6 件s: Industrial Process Control Measurement, Precision Weigh Scale / Load Cell Digitizer, Portable Battery-Powered Data Logger, Isolated Sensor Front-End Module, Multi-Channel Multiplexed Data Acquisition Board, Medical Instrumentation Signal Chain.
Industrial Process Control Measurement
The ADS7813UB/1K's 16-bit resolution and 40 kSPS throughput suit industrial process control loop measurement of 4-20 mA or 0-10V transducer outputs. With a single-ended unipolar input and internal 2.5V reference (or 5V external), the ADC provides <1 LSB integral nonlinearity and no missing codes across the -40C to +85C industrial range, ensuring accurate digitisation of pressure, flow, and temperature sensor signals. The 20 us conversion time and deterministic latency make it ideal for closed-loop PID control. Pair with OPA227 op-amp signal conditioning and an ISO124 isolation barrier for high-noise factory-floor environments.
おすすめ
Precision Weigh Scale / Load Cell Digitizer
Bridge-type load cells output millivolt-level differential signals that the ADS7813UB/1K can digitise when paired with an instrumentation amplifier (e.g., INA128) and a stable reference. The 16-bit resolution yields ~65,000 counts, sufficient for commercial-grade scales (>=0.01% FS). The internal 2.5V reference supports ratiometric measurements when excited by the same supply, cancelling excitation drift. The SOIC-16 package allows compact PCB integration inside scale housings, and the 40 kSPS rate supports multi-channel multiplexed weigh platforms (4-8 load cells per controller).
おすすめ
Portable Battery-Powered Data Logger
The ADS7813UB/1K's power-down mode and low typical operating current make it suitable for portable battery-powered data loggers. The 5V single-supply operation can be derived from a boost converter fed by 2-3 AA cells, or directly from a USB or Li-ion source with LDO regulation. The SPI-compatible serial interface minimises GPIO usage on a small microcontroller (e.g., MSP430 or PIC), and the 16-bit precision captures sensor dynamics over hours or days. SOIC-16's thermal performance supports continuous logging in sealed enclosures without heatsinking.
おすすめ
Isolated Sensor Front-End Module
In isolated analog front-end designs (medical, industrial, or grid monitoring), the ADS7813UB/1K digitises the analog signal at the sensor end, and the serial data crosses an isolation barrier via a digital isolator (e.g., ISO7641). This eliminates analog isolation drift and bandwidth limitations. The SOIC-16 ADC sits on the sensor side of the barrier with a single +5V isolated supply, and its deterministic 20 us conversion time simplifies data framing on the FPGA or MCU receiver side. Robust performance over -40C to +85C suits outdoor and sub-station installations.
おすすめ
Multi-Channel Multiplexed Data Acquisition Board
The ADS7813UB/1K pairs with an external analog multiplexer (e.g., MUX36S08 or CD74HC4067) to create 8/16-channel data acquisition systems. The 40 kSPS rate allows oversampling each channel at 2-5 kSPS, sufficient for thermocouple, RTD, and 4-20 mA industrial signals. The SPI/QSPI/MICROWIRE-compatible serial interface minimises pin usage, freeing MCU GPIO for the mux address bus. The SOIC-16 ADC plus a small SSOP/TSSOP mux and a 16-bit DAC for excitation fit on a 25x25 mm board.
おすすめ
Medical Instrumentation Signal Chain
Medical instrumentation (patient monitors, infusion pumps, ECG front ends) demands 16-bit precision with deterministic latency. The ADS7813UB/1K digitises ECG, pulse oximetry, and temperature sensor signals after front-end amplification. Its single +5V supply simplifies medical-grade power tree design, and the SOIC-16 footprint allows placement adjacent to op-amp signal conditioning on compact analog boards. With proper board layout and guarding, the ADC's <1 LSB INL achieves the SNR needed for IEC 60601-1 medical equipment. Industrial -40C to +85C rating covers most clinical environments.
おすすめ
おすすめ製品の概要
エンジニアリング参考データ: ADS7813UB/1K — 比較、設計ガイダンス、コンプライアンス情報。
選定ガイド
代替品との比較
| パラメータ | この製品 | ADS7813UBG4 | ADS7813U/1K | ADS7813UG4 | ADS7813PB | ADS7813U | ADS7812U |
|---|---|---|---|---|---|---|---|
| Package | 16-SOIC (DW) | 16-SOIC (DW) - same | 16-SOIC narrow - same footprint, narrower body | 16-SOIC narrow - same footprint | 16-PDIP - through-hole | 16-SOIC narrow - same footprint | 16-SOIC narrow - same footprint |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Resolution | 16 bit | 16 bit | 16 bit | 16 bit | 16 bit | 16 bit | 12 bit (-25%) |
| Sample Rate (Max) | 40 kSPS | 40 kSPS | 40 kSPS | 40 kSPS | 40 kSPS | 40 kSPS | 40 kSPS |
| Interface | Serial (SPI) | Serial (SPI) | Serial (SPI) | Serial (SPI) | Serial (SPI) | Serial (SPI) | Serial (SPI) |
| Packaging Format | Tape & Reel (1000 pcs) | Tube (G4 Pb-free) | Tape & Reel (1000 pcs) | Tube | Tube (DIP) | Tube | Tube |
| RoHS Compliance | Yes (Pb-free) | Yes (G4 grade) | Yes | Yes (G4 grade) | Yes | Yes | Yes |
| Operating Temperature | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C |
| Supply Voltage | 4.75V to 5.25V | 4.75V to 5.25V | 4.75V to 5.25V | 4.75V to 5.25V | 4.75V to 5.25V | 4.75V to 5.25V | 4.75V to 5.25V |
主な差別化要因
- 1000-piece reel packaging with identical electrical to ADS7813UB tube variant （vs ADS7813UBG4)
- Wide-body SOIC (DW) footprint for robust PCB assembly （vs ADS7813U/1K)
- Higher resolution vs pin-compatible ADS7812 for design upgrades （vs ADS7812U)
- Pin-compatible with multiple TI packaging variants for design flexibility （vs ADS7807U)
設計ノート
Keep the analog input source impedance below 1 kOhm. The ADS7813UB/1K uses an input sampling capacitor (~25 pF); high source impedance causes gain error and settling-time issues during the 20 us conversion. Add a 10 nF to 100 nF input coupling capacitor close to the analog input pin, and place an RC anti-alias filter (typically 100 Ohm + 1 nF) before the ADC input. Route analog and digital grounds separately and tie them together at a single star point near the ADC's GND pin.
Place the 2.2 uF reference bypass capacitor (low-ESR ceramic) as close as possible to the VREF pin (pin 1). A noisy or unstable reference directly degrades the ADC's SNR and INL. For best performance with the internal reference, add a 0.1 uF ceramic in parallel with the 2.2 uF cap to suppress high-frequency noise. Use a solid ground plane under the SOIC-16 footprint and keep digital traces (CS, DCLOCK, DOUT) away from the analog input trace on the top layer.
Estimated: At 40 kSPS continuous sampling, the ADS7813UB/1K draws ~5 mA from the +5V supply, but in power-down mode (idle between conversions) the current drops to under 100 uA. Ensure your MCU's serial interface operates at <= 2 MHz DCLOCK to avoid violating the timing in the datasheet timing table. Do not apply analog input voltages above VCC + 0.3V or below GND - 0.3V; the analog input ESD diodes can latch up if absolute maximum ratings are exceeded. Always power up the ADC before applying analog signals.
Power the ADS7813UB/1K from a clean +5V LDO regulator (e.g., TPS7A4533) rather than directly from a switching converter rail. Switching noise couples into the reference and degrades SNR; an LC pi-filter (10 uH + 10 uF) plus the LDO provides >40 dB attenuation of switching ripple at the ADC supply. Decouple pins 15 and 16 (both VCC) separately with 0.1 uF + 10 uF ceramic capacitors to ground for best high-frequency noise rejection.
コンプライアンス情報
RoHS/REACH compliant per TI product page. G4 suffix denotes Pb-free/green grade. Not AEC-Q100 qualified - for automotive, see TI's AEC-Q100-qualified ADC families. Conflict-mineral compliant per TI policy.
