ADS7806PBG4 - 12-Bit 40kSPS SAR ADC, 28-PDIP | Texas Instruments
MPN： ADS7806PBG4 ✓ 啟用中ADS7806PBG4 概覽
Key specifications include maximum +/-1/2 LSB integral and differential nonlinearity, 72 dB minimum SINAD at 1 kHz input, and 35 mW maximum power dissipation with a 50 uW power-down mode. The architecture is CMOS SAR with internal or external reference, ensuring compatibility with bipolar industrial signals while operating from a unipolar 5V rail via front-end scaling.
Typical applications include industrial process control data acquisition, multi-channel PLC analog input modules, portable instrumentation with battery power management, and precision sensor signal conditioning. The wide +/-10V input range also supports legacy transducer signal chains without external amplification.
When designing with this device, ensure the analog input is properly buffered to avoid driving the switched-capacitor input directly. Decouple VDD with 10 uF + 0.1 uF capacitors placed within 5 mm of the supply pins.
直接替換替代品，適用於 ADS7806PBG4 — 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： ADS7806PBG4 （相同外形與佔位） — 差異在於 Operating Temperature, Sampling Rate, Data Interface, Input Voltage Range, Package.
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 →ADS7813PG4
✅ 直接替換聯絡詢價
查看資料表 →ADS7800KPG4
✅ 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 →ADS7825U/1K
✅ 直接替換📋 參考替代品（不在目錄中）
ADS7806PBG4 最大額定值與電氣特性
| Number of Bits | 12 |
| 取樣率 | 40 kSPS |
| Input Channels | 1 |
| Architecture | SAR |
| Data Interface | Serial, Parallel |
| 輸入電壓範圍 | +/-10 V, 0 V to +5 V, 0 V to +4 V |
| 供應電壓 | 5 V single |
| Power Dissipation | 35 mW max |
| Power-Down Current | 50 uW |
| INL (Max) | +/-1/2 LSB |
| SINAD | 72 dB min at 1 kHz input |
| Acquisition + Conversion Time | 25 us max |
| Reference | Internal or External |
| 工作溫度 | -40C to +85C |
| 封裝 | 28-PDIP (0.300 inch / 7.62 mm) |
| 安裝類型 | Through-Hole |
| RoHS 狀態 | Compliant |
ADS7806PBG4 腳位配置
| 腳位 1 | VDD — +5V analog supply |
| 腳位 2 | AGND — Analog ground |
| 腳位 3 | REF OUT — Internal reference output |
| 腳位 4 | REF IN — Reference input (external ref option) |
| 腳位 5 | AIN — Analog input |
| 腳位 6 | R1 — Range select bit 1 |
| 腳位 7 | R2 — Range select bit 0 |
| 腳位 8 | CS — Chip select (active low) |
| 腳位 9 | RD — Read strobe (active low) |
| 腳位 10 | WR — Write / convert start (active low) |
| 腳位 11 | BUSY — Conversion in progress flag |
| 腳位 12 | SER — Serial/Parallel mode select |
| 腳位 13 | CLK — Serial clock input |
| 腳位 14 | DB0/SEROUT — Data bit 0 / Serial data out |
| 腳位 15 | DB1 — Data bit 1 |
| 腳位 16 | DB2 — Data bit 2 |
| 腳位 17 | DB3 — Data bit 3 |
| 腳位 18 | DB4 — Data bit 4 |
| 腳位 19 | DB5 — Data bit 5 |
| 腳位 20 | DB6 — Data bit 6 |
| 腳位 21 | DB7 — Data bit 7 |
| 腳位 22 | DB8 — Data bit 8 |
| 腳位 23 | DB9 — Data bit 9 |
| 腳位 24 | DB10 — Data bit 10 |
| 腳位 25 | DB11/MSB — Data bit 11 (MSB) |
| 腳位 26 | TAG — Input polarity / tag bit |
| 腳位 27 | DGND — Digital ground |
| 腳位 28 | VLOG — Logic supply (5V) |
典型應用
ADS7806PBG4 適用於 6 應用s: Industrial Process Control DAQ, Portable Instrumentation with Battery Power, Multi-Channel PLC Analog Input Modules, Precision Sensor Signal Conditioning, Data Acquisition Systems, Audio-Bandwidth Measurement.
Industrial Process Control DAQ
The ADS7806PBG4 fits industrial process-control data-acquisition front ends because of its software-selectable +/-10 V / 0-5 V / 0-4 V input ranges, which allow direct connection to legacy +/-10 V transducer outputs and 4-20 mA shunts without external signal conditioning. According to TI's datasheet, the 72 dB SINAD and +/-1/2 LSB INL are sufficient for PLC-grade accuracy on temperature, pressure, and flow channels. Its 5V single-supply operation simplifies PLC analog-module design versus bipolar designs. The 28-DIP through-hole package suits chassis-mount screw-terminal assemblies common in process-control cabinets. Designers should place 10 uF + 0.1 uF VDD decoupling within 5 mm and buffer the analog input against switching transients.
推薦
Portable Instrumentation with Battery Power
The ADS7806PBG4 is well suited to battery-powered portable instruments because of its 50 uW power-down mode and 35 mW active dissipation. According to the TI datasheet, cycling the ADC into power-down between conversions can reduce effective system current draw by 10-100x compared to continuous operation, extending battery life for hand-held multimeters and field data loggers. The 5V single-supply operation simplifies USB- or 4xAA-powered designs. Its 28-DIP package allows hand-solderable prototyping on perf-board. Design tip: gate the power-down pin with the host MCU's sample-rate timer to coordinate wake/sleep cycles.
推薦
Multi-Channel PLC Analog Input Modules
The ADS7806PBG4's parallel interface and 40 kSPS sampling rate suit multiplexed multi-channel PLC analog input modules. According to TI's datasheet, the SAR architecture's 25 us conversion time lets one ADC serve 8-16 channels via an external analog mux at typical PLC update rates of 100-1000 Hz per channel. The DIP-28 through-hole package resists industrial vibration better than fine-pitch SOIC, important in factory-floor environments. Wide +/-10 V input range handles industrial sensors directly without scaling. Use opto-isolated digital interfaces to maintain galvanic isolation between field and logic grounds.
推薦
Precision Sensor Signal Conditioning
The ADS7806PBG4's 12-bit resolution (1 LSB = 2.4 mV at +/-10 V) suits bridge sensors, thermocouples, and LVDT position sensors in mid-tier precision applications. According to TI's datasheet, the 72 dB SINAD and internal reference provide enough accuracy for sensor temperature-compensation and linearity correction in industrial weighing scales and torque sensors. Single 5V supply operation reduces BOM versus bipolar ADCs. The DIP-28 package suits retrofit and legacy replacement designs. Pair with chopper op-amps for low-drift sensor amplification.
推薦
Data Acquisition Systems
The ADS7806PBG4 fits standalone data-acquisition cards for industrial PCs and embedded test equipment. According to TI's datasheet, its parallel 12-bit bus interface drops cleanly into PC/104, FPGA, and DSP buses without glue logic, while its serial mode can connect to MCUs with minimal pin usage. The 5V single supply suits legacy backplanes. Maximum sampling rate of 40 kSPS is sufficient for audio-bandwidth data logging and vibration analysis. Designers should add input protection diodes when connecting to external test fixtures.
推薦
Audio-Bandwidth Measurement
The ADS7806PBG4 fits audio-bandwidth measurement equipment where its 40 kSPS sampling rate provides adequate Nyquist bandwidth for 20 kHz audio measurements. According to TI's datasheet, the 72 dB SINAD is sufficient for instrumentation-quality audio test gear such as audio analyzers and loudspeaker test jigs. Wide input ranges including +/-10 V allow direct measurement of balanced audio line levels without external attenuators. Single 5V supply simplifies USB-powered test gear.
推薦
推薦產品摘要
工程參考資料，適用於 ADS7806PBG4 — 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 | ADS7807 | ADS7805PB | ADS7813PG4 | ADS7800KPG4 |
|---|---|---|---|---|---|
| Package | 28-PDIP (through-hole) | 28-PDIP (through-hole) - same | 28-PDIP (through-hole) - same | 28-PDIP (through-hole) - same | 28-DIP (through-hole) - same |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Architecture | SAR | SAR | SAR | SAR | SAR |
| Supply Voltage | 5V single | 5V single | 5V single | 5V single | 5V single |
| Pin Compatibility | 28-PDIP baseline | Pin-compatible 16-bit upgrade | Pin-compatible 12-bit variant | 28-DIP through-hole | 28-DIP family member |
主要差異化特點
- Three software-selectable input ranges in one device (對比ADS7805PB)
- 40 kSPS sampling rate with internal reference (對比ADS7800KPG4)
- 50 uW power-down mode for battery use (對比ADS7813PG4)
設計說明
Place a 10 uF tantalum or ceramic bypass capacitor as close as possible to the VDD pin (pin 1) plus a 0.1 uF ceramic in parallel to filter high-frequency noise. According to TI's datasheet, single 5V supply operation requires solid decoupling to maintain rated 72 dB SINAD. For battery-powered designs, route the PWRDN pin to a host MCU GPIO to gate ADC activity between conversions.
Keep analog and digital grounds separated; tie them together at a single point near the AGND pin (pin 2). According to SAR ADC best practice, routed switching transients from the digital bus return currents can couple into the analog front end and degrade SINAD by 3-5 dB if grounds are not properly partitioned. Place the data bus traces away from the AIN and REF traces.
Drive the analog input (pin 5) through a low-impedance op-amp buffer; the ADS7806PBG4's switched-capacitor input draws transient current spikes during acquisition. According to TI's datasheet, an input buffer with bandwidth at least 10x the maximum sample rate preserves the rated THD and SINAD. For +/-10V input range, verify that the chosen op-amp supports the full input range to within the common-mode limit.
Estimated: when using the internal reference, REF OUT (pin 3) should be decoupled with 10 uF + 0.1 uF; bypassing both reduces reference noise by an order of magnitude and improves overall accuracy. Never short REF IN to REF OUT externally; doing so may damage the internal reference buffer.
合規資訊
RoHS compliant per manufacturer product page; through-hole DIP packaging supports legacy and industrial retrofit designs. Not automotive AEC-Q100 qualified.
