ADS7806UG4 - 12-Bit 40kSPS SAR ADC | Texas Instruments
MPN： ADS7806UG4 ✓ 啟用中ADS7806UG4 概覽
Key features include 12-bit resolution with no missing codes, ±1/2 LSB maximum INL and DNL, 72 dB minimum SINAD at a 1 kHz input, internal 2.5V reference (or external reference option), parallel and serial data output drivers, and pin compatibility with the 16-bit ADS7807. The 28-SOIC package allows easy migration to higher resolution within the same footprint.
A SAR (Successive Approximation Register) ADC is a precision data-conversion topology that uses a binary-search algorithm against an internal DAC and comparator to digitize an analog input one bit at a time. SAR ADCs sit in the broader hierarchy of: ADC -> data converter -> signal-chain IC -> mixed-signal semiconductor. They are prized for deterministic latency, no-pipeline-delay behavior, and excellent DC accuracy, which is why the ADS7806UG4 remains a popular choice for multiplexed industrial data-acquisition systems.
Typical applications include industrial process control, multi-channel data acquisition boards, instrumentation, portable battery-powered measurement, and medical monitoring front-ends. The single +5V supply and software-controlled power-down mode make it well suited for power-sensitive embedded designs.
When designing with this device, ensure the analog input is properly buffered and that the SHDN pin is asserted for at least 1 µs to enter power-down. A 10 µF bypass capacitor on REF and 0.1 µF on VDD are recommended for stable conversions. The SAR architecture guarantees zero pipeline delay, simplifying multiplexed sampling.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone.
直接替換替代品，適用於 ADS7806UG4 — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： ADS7806UG4 （相同外形與佔位） — 差異在於 Package, Resolution, Operating Temperature, Data Interface, Input Voltage Range.
ADS7806U
✅ 直接替換聯絡詢價
查看資料表 →ADS7806PB
✅ 直接替換📋 參考替代品（不在目錄中）
ADS7807
✅ 直接替換📋 參考替代品（不在目錄中）
ADS7805PB
✅ 直接替換聯絡詢價
查看資料表 →ADS7805PG4
✅ 直接替換聯絡詢價
查看資料表 →ADS7806UG4 最大額定值與電氣特性
| 解析度 | 12 bit |
| 取樣率 | 40 kSPS |
| Number of Channels | 1 |
| Architecture | SAR (Successive Approximation Register) |
| Input Type | Single-Ended, Pseudo-Bipolar |
| Input Voltage Ranges | ±10V, 0V to +5V, 0V to +4V |
| 供應電壓 | 4.75 V to 5.25 V (single +5V) |
| Power Dissipation | 35 mW max |
| Power-Down Mode | 50 µW |
| Acquisition and Conversion Time | 25 µs max |
| INL (Max) | ±0.5 LSB |
| DNL (Max) | ±0.5 LSB |
| SINAD | 72 dB min (1 kHz input) |
| Data Interface | Parallel and Serial |
| Reference | Internal 2.5V or External |
| 工作溫度 | -40C to +85C |
| 封裝 | 28-SOIC (DW) |
| Pin Compatibility | Pin-compatible with 16-bit ADS7807 |
| RoHS 狀態 | Compliant (G4 suffix indicates Green / lead-free) |
ADS7806UG4 腳位配置
| 腳位 1 | VANA — Analog supply voltage (+5V) |
| 腳位 2 | AGND — Analog ground |
| 腳位 3 | REF — Reference voltage input/output (internal 2.5V or external) |
| 腳位 4 | IN — Analog input |
| 腳位 5 | R1I — Range 1 input resistor node |
| 腳位 6 | R1IN — Range 1 input reference |
| 腳位 7 | CS — Chip select (active low) |
| 腳位 8 | RC — RC timing pin for conversion clock |
| 腳位 9 | SHDN — Shutdown (active high) |
| 腳位 10 | BUSY — Conversion in progress (active high) |
| 腳位 11 | DGND — Digital ground |
| 腳位 12 | VDIG — Digital supply voltage (+5V) |
| 腳位 13 | DB11/MSB — Data bit 11 (MSB), parallel output |
| 腳位 14 | DB10 — Data bit 10, parallel output |
| 腳位 15 | DB9 — Data bit 9, parallel output |
| 腳位 16 | DB8 — Data bit 8, parallel output |
| 腳位 17 | DB7 — Data bit 7, parallel output |
| 腳位 18 | DB6 — Data bit 6, parallel output |
| 腳位 19 | DB5 — Data bit 5, parallel output |
| 腳位 20 | DB4 — Data bit 4, parallel output |
| 腳位 21 | DB3 — Data bit 3, parallel output |
| 腳位 22 | DB2 — Data bit 2, parallel output |
| 腳位 23 | DB1 — Data bit 1, parallel output |
| 腳位 24 | DB0/LSB — Data bit 0 (LSB), parallel output |
| 腳位 25 | DATACLK — Serial data clock output |
| 腳位 26 | SDATA — Serial data output |
| 腳位 27 | SYNC — Sync input for serial mode |
| 腳位 28 | TAG — Tag input for serial mode |
典型應用
ADS7806UG4 適用於 6 應用s: Industrial Process Control, Multi-Channel Data Acquisition Systems, Portable Battery-Powered Measurement, Medical Monitoring Front-End, Test and Measurement Instrumentation, Communication Equipment Monitoring.
Industrial Process Control
The ADS7806UG4 is well suited for industrial process-control front-ends reading ±10V analog signals from pressure transmitters, thermocouple amplifiers, and 4-20 mA sense resistors. The ±10V true-bipolar input range matches the output range of most industrial transmitters without external signal conditioning, while ±0.5 LSB INL ensures gain calibration errors remain below the 12-bit noise floor. Its 40 kSPS throughput supports multiplexed scanning of 8-16 channels at typical 1 kHz per-channel rates. The -40C to +85C industrial temperature range and 35 mW power dissipation allow dense multi-board installations without active cooling.
推薦
Multi-Channel Data Acquisition Systems
For multiplexed DAQ boards scanning multiple analog channels, the ADS7806UG4's zero-pipeline-delay SAR architecture delivers deterministic latency that simplifies software timing. With 40 kSPS throughput, the designer can allocate sample time across 8 to 16 channels at 2.5 kHz per channel aggregate. The internal 2.5V reference combined with parallel+serial outputs allows simultaneous sampling control and SPI/QSPI daisy-chaining of multiple ADCs. The 50 µW power-down mode permits per-channel duty cycling to reduce average system power when scanning slow-moving signals such as temperature or strain gauges.
推薦
Portable Battery-Powered Measurement
Battery-powered handheld instruments benefit from the ADS7806UG4's 35 mW active dissipation and 50 µW power-down mode. The SHDN pin allows software to idle the ADC between conversions, dropping average power to micro-watts for duty-cycled measurements such as digital multimeters or portable environmental monitors. The single +5V supply aligns directly with USB-powered or 4-cell NiMH architectures, eliminating the need for negative rails. The SOIC-28 package provides a low-profile footprint suitable for handheld enclosures, and the 0V-to-+5V input range covers most battery-monitoring and sensor-bridge applications directly.
推薦
Medical Monitoring Front-End
Medical instrumentation such as patient monitors, infusion pumps, and pulse oximeters require reliable mid-resolution digitisation of low-frequency analog signals. The ADS7806UG4's ±0.5 LSB linearity, 72 dB SINAD, and zero pipeline delay make it appropriate for digitising ECG, SpO2 photodiode, and temperature signals. Its industrial temperature rating supports clinical-environment operation, and the internal reference eliminates the need for a separate precision reference IC. The 28-SOIC footprint simplifies assembly with automated pick-and-place for medium-volume medical device production.
推薦
Test and Measurement Instrumentation
Bench-top test equipment and rack-mount instrumentation often require a 12-bit auxiliary digitiser for calibration, monitoring, or self-test channels. The ADS7806UG4's parallel output interface allows direct bus attachment to legacy microprocessors without glue logic, and the serial output supports modern microcontroller SPI ports. The internal clock and reference simplify the BOM, while the SOIC-28 footprint keeps the layout compact inside dense instrument chassis. 72 dB SINAD at 1 kHz input ensures accurate capture of audio-band test signals and reference measurements in calibration routines.
推薦
Communication Equipment Monitoring
Inside base-station power amplifiers, optical line cards, and network switches, the ADS7806UG4 can monitor supply rails, temperature, and gain-control voltages. Its ±10V input handles intermediate-bus voltages up to 10V directly, while the 40 kSPS sample rate is sufficient for thermal-foldback and AGC loops. The 5V single-supply operation is compatible with typical telecom hardware platforms, and the 35 mW power dissipation contributes negligibly to chassis thermal budgets. Parallel output enables fast response in microcontroller-managed housekeeping tasks.
推薦
推薦產品摘要
工程參考資料，適用於 ADS7806UG4 — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | ADS7806U | ADS7806PB | ADS7807 | ADS7805PB | ADS7805PG4 |
|---|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | 28-SOIC (DW) | 28-SOIC (DW) - same | 28-SOIC (DW) - same | 28-SOIC (DW) - same | 28-SOIC (DW) - same | 28-PDIP - different |
| Resolution | 12 bit | 12 bit | 12 bit | 16 bit | 12 bit | 12 bit |
| Sampling Rate | 40 kSPS | 40 kSPS | 40 kSPS | 40 kSPS | 40 kSPS | 40 kSPS |
| Architecture | SAR | SAR | SAR | SAR | SAR | SAR |
| Input Range | ±10V / 0-5V / 0-4V | ±10V / 0-5V / 0-4V | ±10V / 0-5V / 0-4V | ±10V / 0-5V / 0-4V | ±10V (single range) | ±10V (single range) |
| Power Dissipation | 35 mW max | 35 mW max | 35 mW max | 35 mW max | 35 mW max | 35 mW max |
| Lead-Free / RoHS | Yes (G4) | No (legacy SnPb) | Yes (PB suffix) | Yes | Yes | Yes (G4) |
| Internal Reference | 2.5V internal | 2.5V internal | 2.5V internal | 2.5V internal | 2.5V internal | 2.5V internal |
主要差異化特點
- True bipolar ±10V input from single +5V supply (對比ADS7805PB)
- Pin-compatible with 16-bit ADS7807 (對比ADS7807)
- RoHS-compliant lead-free assembly (G4 suffix) (對比ADS7806U)
設計說明
The ADS7806UG4 operates from a single +5V supply on both VANA (pin 1) and VDIG (pin 12). Place a 0.1 µF ceramic bypass capacitor within 5 mm of each supply pin and a 10 µF tantalum or ceramic bulk capacitor near the chip to suppress noise from digital switching. The SHDN pin (active high) drops power dissipation to 50 µW when not converting; assert SHDN for at least 1 µs to enter shutdown reliably per the TI datasheet.
Separate analog (AGND, pin 2) and digital (DGND, pin 11) ground planes, joining them at a single point under the ADC star-ground. Route analog input traces as differential pairs away from digital outputs (DB0-DB11, DATACLK, SDATA) to minimise digital feedthrough. The REF pin requires a 10 µF bypass capacitor to achieve specified noise and INL performance; do not omit this capacitor.
Drive the analog input (IN, pin 4) from a low-impedance buffer with bandwidth at least 10× the ADC's 40 kSPS Nyquist. The TI datasheet recommends an op-amp with settling time below 1 µs to 0.5 LSB, such as OPA2277 or OPA2227. Source impedance above 1 kΩ degrades THD due to input-charge kickback from the internal sample capacitor.
Do not leave SHDN floating; tie it to DGND if shutdown is unused. Do not exceed VANA = VDIG = 5.25V; the absolute maximum supply is 6V. The RC pin requires an external RC network to set the internal conversion clock; follow the datasheet's RC formula exactly to maintain specified 25 µs acquisition-and-conversion time.
合規資訊
G4 suffix indicates TI Green (RoHS-compliant, Pb-free) assembly. Industrial temperature grade -40C to +85C. AEC-Q100 not applicable (industrial-grade part).
