ADS7806U/1K - 12-Bit 40kHz SAR ADC, Parallel/Serial, SOIC-28 | TI
部品番号: ADS7806U/1K ✓ 生産中| 数量 | 単価 | 小計 |
|---|---|---|
| 1 | $17.5 | $17.50 |
| 10 | $15.8 | $158.00 |
| 100 | $13.2 | $1,320.00 |
| 500 | $11.95 | $5,975.00 |
| 1,000 | $10.8 | $10,800.00 |
ADS7806U/1K 概要
An ADC (Analog-to-Digital Converter) is a mixed-signal integrated circuit that quantizes a continuous analog voltage into a discrete digital code. SAR (Successive-Approximation Register) ADCs convert one bit per clock cycle by comparing the input against an internal DAC, making them well suited for medium-speed, medium-resolution data acquisition. The ADS7806 sits in the SAR ADC family -> data acquisition ICs -> mixed-signal ICs -> integrated circuits, offering both parallel and serial data output interfaces.
Key features include 35 mW maximum power dissipation, a 50 uW power-down mode for battery-friendly operation, +/-1/2 LSB maximum INL and DNL, and 72 dB minimum SINAD at 1 kHz input. The input range spans 0V to +5V (with software configuration to +/-5V and +/-4V), and the device operates from a single +5V supply. The combination of low power, parallel+serial interface, and single-supply operation makes it a flexible drop-in for embedded data acquisition.
The architecture uses a capacitive-charge-distribution DAC with a sample-and-hold front end and an on-chip clock. The conversion is initiated by a CONVST pulse, and the result is available on either the parallel DB0-DB11 bus or a SPI-compatible serial port with internal/external clock option. Hardware byte-select pins let the host read high and low bytes sequentially on the parallel bus.
Typical applications include industrial process control, portable instrumentation, data acquisition systems, and battery-powered sensor digitizers. The 50 uW power-down current is critical for handheld medical or field instruments where the ADC is idle most of the time.
When designing with this device, ensure the input is within the source-impedance budget specified in the manufacturer datasheet to avoid conversion-time violations; the S/H front end must be fully settled in 25 us. Use a clean +5V analog supply with adequate decoupling, and route digital outputs away from the analog input traces to limit digital feedthrough.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes that complement the manufacturer datasheet and distributor listings.
ドロップイン代替品: ADS7806U/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: ADS7806U/1K （同一形状・フットプリント） — 相違点: Number of Channels, Package, Resolution, Architecture, Mounting Type.
クイック比較ツール — 並列比較する代替部品を選択:
ADS7806U
✅ ドロップイン📋 参考代替品（カタログ未掲載）
ADS7807U
✅ ドロップイン📋 参考代替品（カタログ未掲載）
ADS7805PB
✅ ドロップイン ⚠️ 仕様未検証✓ 在庫あり
$10.95 / 個
データシートを見る →ADS7806PG4
✓ 在庫あり
$13.2 / 個
データシートを見る →ADS7813UB/1K
✅ ドロップイン✓ 在庫あり
$9.85 / 個
データシートを見る →ADS7806U/1K 最大定格＆電気的特性
| 分解能 | 12 bits |
| Architecture | SAR (Successive-Approximation) |
| Number of Channels | 1 input, single-ended |
| Sample Rate | 40 kS/s max |
| Acquisition + Conversion Time | 25 us max |
| 入力電圧範囲 | 0 V to +5 V (also +/-5 V, +/-4 V modes) |
| 電源電圧 | +5 V single supply |
| Power Dissipation | 35 mW max |
| Power-Down Current | 50 uW max |
| INL (Max) | +/-1/2 LSB |
| DNL (Max) | +/-1/2 LSB |
| SINAD | 72 dB min @ 1 kHz input |
| Data Output Interface | Parallel and Serial (SPI-compatible) |
| パッケージ | 28-SOIC |
| 動作温度範囲 | -40 C to +85 C |
| RoHS ステータス | Compliant |
ADS7806U/1K ピン構成
| ピン 1 | ANALOG IN — Analog input to ADC sample-and-hold |
| ピン 2 | +VREF — Reference voltage input (positive) |
| ピン 3 | REF GND — Reference ground return |
| ピン 4 | AGND — Analog ground |
| ピン 5 | DB11 (MSB) — Parallel data bit 11 (MSB) |
| ピン 6 | DB10 — Parallel data bit 10 |
| ピン 7 | DB9 — Parallel data bit 9 |
| ピン 8 | DB8 — Parallel data bit 8 |
| ピン 9 | DB7 — Parallel data bit 7 |
| ピン 10 | DB6 — Parallel data bit 6 |
| ピン 11 | DB5 — Parallel data bit 5 |
| ピン 12 | DB4 — Parallel data bit 4 |
| ピン 13 | DB3 — Parallel data bit 3 |
| ピン 14 | DB2 — Parallel data bit 2 |
| ピン 15 | DB1 — Parallel data bit 1 |
| ピン 16 | DB0 (LSB) — Parallel data bit 0 (LSB) |
| ピン 17 | HBEN — High byte enable for parallel bus |
| ピン 18 | BYSL — Byte select (high/low) |
| ピン 19 | R/C — Read/Conversion control |
| ピン 20 | CS — Chip select (active low) |
| ピン 21 | BUSY — Conversion in progress output |
| ピン 22 | CONVST — Conversion start input |
| ピン 23 | SCLK/EXTCLK — Serial clock / external clock input |
| ピン 24 | DOUT — Serial data output (SPI-compatible) |
| ピン 25 | DGND — Digital ground |
| ピン 26 | VDD — +5 V digital supply |
| ピン 27 | RANGE — Input range select (0-5V / +/-5V / +/-4V) |
| ピン 28 | PWRDN — Power-down control input |
主な用途
ADS7806U/1K の用途: 6 件s: Industrial Process Control Data Acquisition, Portable Battery-Powered Instrumentation, Data Acquisition Front Ends for PLCs, Sensor Signal Digitization (Temperature, Strain, Pressure), Medical and Point-of-Care Diagnostic Devices, Automotive Sensor Interfaces (Non-Safety).
Industrial Process Control Data Acquisition
The ADS7806U/1K is well-suited for industrial process-control analog front ends because of its 0 V to +5 V and +/-5 V or +/-4 V input ranges and 12-bit resolution. Its +/-1/2 LSB maximum INL and DNL deliver reliable quantization for pressure, temperature, and flow transmitters feeding a 4-20 mA loop (with a sense resistor). At 40 kS/s with 25 us acquisition-plus-conversion time, it digitizes multiple process signals via an external multiplexer without bottlenecking the controller. The single +5 V supply matches industrial 24V-bus-derived analog rails, and the SOIC-28 package is footprint-compatible with the rest of the TI ADS78xx ADC family, simplifying board respins.
おすすめ
Portable Battery-Powered Instrumentation
The 50 uW maximum power-down current of the ADS7806U/1K makes it a strong fit for handheld multimeters, field data loggers, and portable medical instruments that spend most of their life in standby. The 35 mW active power is low enough to share a linear regulator with the host MCU. A CONVST-triggered single-shot conversion and an SPI-compatible serial output keep the host from tying up GPIO pins. The -40 C to +85 C operating range covers outdoor and cold-chain logistics applications. Designers can leave the ADC in power-down between measurements and wake it on demand for sub-1 mA average battery drain.
おすすめ
Data Acquisition Front Ends for PLCs
In PLC analog input modules the ADS7806U/1K's parallel + SPI dual interface lets the host read conversions either via fast 12-bit bus cycles or low-pin-count serial. The 72 dB minimum SINAD at 1 kHz ensures that 12-bit codes are trustworthy across the audio-band industrial noise spectrum, while the single +5 V supply simplifies the PLC's isolated analog rail. Combined with an external MUX and front-end protection network, a single ADS7806U/1K serves 4 to 8 channels at the 40 kS/s aggregate throughput. The SOIC-28 package is well-suited to the ruggedized through-hole and surface-mount assembly lines typical of industrial automation.
おすすめ
Sensor Signal Digitization (Temperature, Strain, Pressure)
Bridge-type sensors such as load cells, strain gauges, and pressure transducers benefit from the 12-bit, 40 kS/s sampling rate of the ADS7806U/1K for digitizing amplified transducer outputs. The 0 V to +5 V input range matches single-supply instrumentation amplifier outputs, and the +/-1/2 LSB INL/DNL preserves calibration linearity across the full code range. The SPI-compatible serial output allows galvanic isolation with a digital isolator and just three signal lines, simplifying isolation barrier design for medical or high-voltage transducer applications. Designers pair the ADC with a precision op-amp reference buffer for full 12-bit performance.
おすすめ
Medical and Point-of-Care Diagnostic Devices
Point-of-care diagnostic instruments (glucometers, blood-gas analyzers, handheld ultrasound preamps) use the ADS7806U/1K for its low 50 uW power-down current and parallel+serial interface flexibility. The 40 kS/s sample rate captures transient bio-signals with enough margin for software filtering, while the 12-bit resolution is sufficient for many optical and electrochemical sensor channels. The SOIC-28 package is reflow-solderable on standard medical-grade PCB assemblies. Single +5 V operation simplifies the medical IEC 60601-1 isolation design, and the device's wide -40 C to +85 C operating range supports both cold-chain transport and warm clinical environments.
おすすめ
Automotive Sensor Interfaces (Non-Safety)
For non-safety automotive applications such as body-control modules, HVAC sensor digitizers, and battery-management analog front ends, the ADS7806U/1K's -40 C to +85 C industrial range covers cabin and under-hood-adjacent environments. The 12-bit resolution and 72 dB SINAD are sufficient for thermistor, current-sense, and humidity sensor channels. The single +5 V supply interfaces cleanly with the 12 V automotive bus behind a low-dropout regulator. Designers should note that the ADS7806U/1K is NOT AEC-Q100 qualified; for safety-critical automotive channels, use a TI AEC-Q100 ADC instead, with this part serving only non-safety body and comfort electronics.
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: ADS7806U/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 | ADS7806U | ADS7807U | ADS7806PG4 | ADS7805PB | ADS7813UB/1K |
|---|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | SOIC-28 | SOIC-28 - same | SOIC-28 - same | SOIC-28 - same | SOIC-28 - same | SOIC-28 - same |
| Resolution | 12 bits | 12 bits | 16 bits | 12 bits | 16 bits | 12 bits |
| Architecture | SAR | SAR | SAR | SAR | SAR | SAR |
| Data Output | Parallel + SPI serial | Parallel + SPI serial | Parallel + SPI serial | Parallel + SPI serial | Parallel + SPI serial | Serial (SPI) |
| Supply Voltage | +5 V single | +5 V single | +5 V single | +5 V single | +5 V single | +5 V single |
| Packaging Format | Tape & Reel (1K) | Tube | Tube | Tube (RoHS-green) | Tube | Tape & Reel (1K) |
主な差別化要因
- Dual parallel + SPI serial interface in one ADC （vs ADS7813UB/1K)
- Lower power-down current for battery applications （vs ADS7805PB)
- Tape & Reel packaging format aligned with SMT production （vs ADS7806U (Tube))
設計ノート
Decouple the +5 V VDD pin with a 10 uF tantalum or ceramic bulk capacitor in parallel with a 0.1 uF ceramic placed within 5 mm of the supply pin. The ADS7806U/1K's 35 mW active dissipation is small but the SAR architecture draws a transient current spike during the internal DAC settling phase; inadequate decoupling can cause reference droop that translates to bit errors. Place an LC or ferrite-bead pi filter on the analog +5 V rail upstream of the ADC for noise-sensitive 12-bit acquisition.
Route the parallel data bus (DB0-DB11) and the SPI serial signals away from the analog input trace and the reference decoupling capacitor. Digital bus edges of 5-10 ns couple capacitive feedthrough into the sample-and-hold front end and can corrupt the conversion. Use a guard trace tied to AGND between the analog input pin (pin 1) and any digital trace within 5 mm. Keep the reference capacitor (typically 10 uF between +VREF and REF GND) physically close to pins 2 and 3 with the ground return directly back to the AGND pin.
Do not exceed the maximum source impedance of the analog input driver for the 25 us acquisition-plus-conversion window - if the op-amp output impedance plus any input filter resistance exceeds the manufacturer datasheet budget, the input will not fully settle and the conversion result will be biased. For ±5 V or ±4 V bipolar input ranges, the RANGE pin (pin 27) must be configured to the matching mode at power-up; do not leave it floating. The PWRDN pin (pin 28) must be driven low to enter the 50 uW shutdown mode - a floating PWRDN can leave the device in indeterminate state.
コンプライアンス情報
RoHS compliant per TI product page. Industrial temperature grade only; not AEC-Q100 qualified for automotive safety-critical applications.
