ADS7806PG4 - 12-Bit 40kSPS SAR ADC, Bipolar Inputs | Texas Instruments
MPN： ADS7806PG4 ✓ 啟用中ADS7806PG4 概覽
An SAR Analog-to-Digital Converter is a type of data converter that uses an iterative binary-search algorithm against an internal capacitive ladder to determine the digital representation of an analog input voltage. Within the broader component hierarchy, an SAR ADC sits between high-resolution (but slow) delta-sigma converters and high-speed (but lower-resolution) flash converters, making it ideal for general-purpose industrial signal acquisition. The ADS7806 specifically targets bipolar-input data acquisition systems that require both true-bipolar measurement and low power consumption (35 mW typical, 50 µW in power-down mode).
Key specifications from the verified datasheet include ±10 V and 0 V to 5 V true bipolar input ranges, 25 µs maximum acquisition-and-conversion time, ±½ LSB maximum integral and differential nonlinearity, and 72 dB minimum SINAD with a 1 kHz input signal. The converter operates from a single +5 V analog supply, with separate AVdd and DVdd pins for noise isolation. The parallel + serial output interface (configurable via the BYTE/SEQ pin) lets the host processor trade bus width for board real estate.
Architecturally, the ADS7806 uses a charge-redistribution DAC array that inherently performs the sample-and-hold function during the acquisition phase, eliminating the need for an external input buffer. The internal 2.5 V reference is laser-trimmed and buffered, ensuring 12-bit performance without external reference components. Combined with the input protection network (±25 V tolerant at the analog input pin), the device provides robust signal-chain performance in industrial environments.
Typical applications include multi-channel industrial process control, instrumentation and data-acquisition front ends, portable or battery-operated measurement systems, and test equipment requiring true bipolar input ranges. The combination of low power dissipation, internal reference, and flexible interface makes the ADS7806 well-suited for embedded industrial designs.
When designing with this device, observe the analog/digital supply decoupling guidelines from the datasheet (10 µF and 0.1 µF capacitors at AVdd and DVdd) and respect the 25 µs acquisition timing budget to avoid conversion errors. The "PG4" package code indicates a Pb-free 28-pin PDIP (N) with Tube packaging; distributors ship the device in anti-static tubes, and the cross-reference note "Replaced by ADS8506" indicates TI's recommended migration path for new designs.
This page synthesizes distributor pricing, drop-in compatible alternatives, and practical design notes not found in the manufacturer datasheet, giving engineers a single decision-ready view of the ADS7806PG4.
直接替換替代品，適用於 ADS7806PG4 — 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： ADS7806PG4 （相同外形與佔位） — 差異在於 Package, Data Interface, Operating Temperature, SINAD, Internal Reference.
ADS7805PG4
✅ 直接替換聯絡詢價
查看資料表 →ADS7806PG4 最大額定值與電氣特性
| 解析度 | 12 bits |
| Architecture | SAR (Successive Approximation Register) |
| Sample Rate | 40 kSPS |
| Acquisition + Conversion Time | 25 us max |
| Number of Channels | 1 |
| 輸入電壓範圍 | +/-10 V and 0 V to 5 V (bipolar) |
| Analog Supply Voltage | 5 V (typical) |
| Power Dissipation | 35 mW max (typical), 50 uW in power-down mode |
| INL (積分非線性) | +/-1/2 LSB max |
| DNL (Differential Nonlinearity) | +/-1/2 LSB max |
| SINAD | 72 dB min at 1 kHz input |
| Data Interface | Parallel and Serial (configurable) |
| 工作溫度範圍 | -40C to +85C (industrial) |
| 封裝 | 28-DIP (PDIP, 0.300 inch / 7.62 mm) |
| 安裝類型 | Through-Hole |
| Input Protection | Up to +/-25 V tolerant |
| Internal Reference | Yes (2.5 V laser-trimmed) |
| RoHS 狀態 | Pb-free (PG4 ordering code) |
ADS7806PG4 28-dip (pdip, 0.300 inch / 7.62 mm) 腳位配置指南
ADS7806PG4（28-dip (pdip, 0.300 inch / 7.62 mm) 封裝）的腳位配置。 此類比元件具有輸入、輸出與電源腳位。偏移歸零、補償與致能腳位配置請參閱製造商資料表。適用於訊號調理與放大器電路。
無詳細腳位定義資料： ADS7806PG4.
請參閱 資料表 以查看完整腳位配置。
典型應用
ADS7806PG4 適用於 6 應用s: Industrial Process Control Input Modules, Portable / Battery-Powered Data Loggers, Test and Measurement Instrumentation, Medical Patient Monitoring Front Ends, Audio Signal Processing and DSP Front Ends, Automotive Sensor Signal Conditioning (Non-Safety).
Industrial Process Control Input Modules
The ADS7806PG4 supports multi-channel industrial process control PLCs and remote I/O modules with 40 kSPS throughput and +/-10 V bipolar true input range. Its built-in +/-25 V input protection and 72 dB SINAD simplify front-end design for 4-20 mA loop receivers and +/-10 V transducer signals. Designers can scan up to 8 channels per second at 12-bit resolution using the parallel interface to an industrial MCU. Power dissipation stays at 35 mW per ADC, keeping 16-channel aggregate budget under 600 mW.
推薦
Portable / Battery-Powered Data Loggers
For handheld and battery-powered data loggers, the ADS7806PG4's 50 uW power-down mode enables aggressive duty cycling; a one-second conversion cadence yields average consumption below 100 uW. The 12-bit resolution plus +/-10 V input range directly digitizes thermocouple and process-voltage signals without external range-switching relays. Single-supply 5 V operation and internal reference minimize BOM cost in space-constrained handheld enclosures.
推薦
Test and Measurement Instrumentation
Benchtop and ATE-style test instruments benefit from the ADS7806PG4's 72 dB SINAD and 0 V to 5 V unipolar range for digitizing sensor outputs, shunt currents, and analog front-end monitor signals. The parallel + serial dual interface lets the same PCB act as either a plug-in data-acquisition card or a SPI-controlled peripheral. Combined with the internal 2.5 V reference and 25 us acquisition time, the device delivers repeatable measurements across wide temperature conditions.
推薦
Medical Patient Monitoring Front Ends
Patient monitoring peripherals (ECG front ends, SpO2 modules, infusion pump controllers) use the ADS7806PG4 to digitize +/-5 V or +/-10 V analog signals from sensor conditioning blocks at sample rates up to 40 kSPS. The industrial -40 C to +85 C temperature rating covers non-body-contact electronic environments, while the integrated input protection guards against electrostatic discharge events during patient connection cycling.
推薦
Audio Signal Processing and DSP Front Ends
Although not a precision audio ADC, the ADS7806PG4's 40 kSPS throughput makes it well suited to control-loop and envelope-follower sampling at audio-bandwidth frequencies. The bipolar +/-10 V input range accommodates line-level audio signals after a simple resistive attenuator and DC-blocking cap, while the parallel interface streams conversion results to a host DSP or microcontroller running real-time audio effects processing algorithms.
推薦
Automotive Sensor Signal Conditioning (Non-Safety)
For non-safety automotive body and chassis subsystems, the ADS7806PG4's industrial -40 C to +85 C range handles cabin and underhood thermal exposure. Its bipolar +/-10 V input range and 12-bit resolution digitize wheel-speed sensors, throttle-position feedbacks, and HVAC pressure transducer outputs with adequate dynamic range. Note that AEC-Q100-qualified variants are required for safety-critical automotive subsystems; the PG4 version is best suited to non-safety body electronics prototypes.
推薦
推薦產品摘要
工程參考資料，適用於 ADS7806PG4 — 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 | ADS7805PG4 | ADS7806P | ADS7806U |
|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | 28-DIP (PDIP) | 28-DIP (PDIP) - same | 28-DIP (PDIP) - same | SOIC-28 - different (not drop-in) |
| Resolution | 12 bits | 12 bits | 12 bits | 12 bits |
| Sample Rate | 40 kSPS | 40 kSPS | 40 kSPS | 40 kSPS |
| Acquisition + Conversion Time | 25 us max | 25 us max | 25 us max | 25 us max |
| Analog Input Range | +/-10 V and 0 V to 5 V | +/-5 V (lower FSR) | +/-10 V and 0 V to 5 V - same | +/-10 V and 0 V to 5 V - same |
| Power Dissipation | 35 mW max (50 uW shutdown) | 35 mW max (50 uW shutdown) | 35 mW max (50 uW shutdown) | 35 mW max (50 uW shutdown) |
| SINAD | 72 dB min at 1 kHz | 72 dB min at 1 kHz | 72 dB min at 1 kHz | 72 dB min at 1 kHz |
| Interface | Parallel + Serial | Parallel + Serial | Parallel + Serial | Parallel + Serial |
| Operating Temperature | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C |
主要差異化特點
- True bipolar +/-10 V input range in the same through-hole package (對比ADS7805PG4)
- Pb-free RoHS-compliant ordering code (PG4) (對比ADS7806P (Pb-bearing legacy))
設計說明
Decouple AVdd and DVdd with a 10 uF tantalum or ceramic bulk capacitor plus a 0.1 uF high-frequency ceramic placed within 5 mm of each supply pin. According to the TI ADS7806 datasheet, the analog and digital grounds should tie to a common low-impedance ground plane; avoiding separate analog/digital grounds with a single star connection prevents ground-loop noise coupling into the input reference.
Do not exceed the 25 us acquisition-plus-conversion budget. According to the TI datasheet, driving the CONVST signal before the previous conversion completes will corrupt the current conversion result. Designers should either poll the BUSY pin in software or design hardware sequencing that respects the 25 us minimum cycle time to avoid intermittent conversion errors.
Route the analog input traces as short as possible and shield them with a guard trace tied to analog ground. According to the TI datasheet, the analog and digital sections of the PCB should be physically separated, with the chip placed so that noisy digital lines do not cross under the input pin or reference pin. Use a single ground plane with careful partition for analog and digital return currents to avoid reference-voltage disturbance.
合規資訊
PG4 ordering code designates Pb-free, RoHS-compliant 28-DIP tube packaging per TI ordering nomenclature. Not AEC-Q100 qualified - choose AEC-Q100 parts for safety-critical automotive subsystems.
