ADS7806PG4 - 12-Bit 40kSPS SAR ADC, Bipolar Inputs | Texas Instruments
MPN: ADS7806PG4 ✓ פעילADS7806PG4 סקירה
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.
חלופות תחליף ישיר עבור ADS7806PG4 — אותו מארז, תואם פין-לפין. חלקים במארז שונה הדורשים עיבוד מחדש של ה-PCB אינם נכללים.
וריאנטים בסדרה זו
דגמים מאותה סדרה התואמים Drop-in עם ADS7806PG4 (אותו גורם צורה וטביעת רגל) — שונים ב Package, Data Interface, Operating Temperature, SINAD, Internal Reference.
ADS7805PG4
✅ Drop-Inצור קשר לקבלת מחיר
הצג גיליון נתונים ←ADS7806P
✅ Drop-Inצור קשר לקבלת מחיר
הצג גיליון נתונים ←ADS7806PG4 דירוגים מרביים ומאפיינים חשמליים
| רזולוציה | 12 bits |
| Architecture | SAR (Successive Approximation Register) |
| Sample Rate | 40 kSPS |
| Acquisition + Conversion Time | 25 us max |
| Number of Channels | 1 |
| טווח מתח כניסה | +/-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 (אי-לינאריות אינטגרלית) | +/-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) |
| טווח טמפרטורת פעולה | -40C to +85C (industrial) |
| מארז | 28-DIP (PDIP, 0.300 inch / 7.62 mm) |
| סוג הרכבה | Through-Hole |
| Input Protection | Up to +/-25 V tolerant |
| Internal Reference | Yes (2.5 V laser-trimmed) |
| סטטוס RoHS | Pb-free (PG4 ordering code) |
מדריך תצורת פינים של ADS7806PG4 28-dip (pdip, 0.300 inch / 7.62 mm)
תצורת פינים עבור ADS7806PG4 (מארזת 28-dip (pdip, 0.300 inch / 7.62 mm)). רכיב אנלוגי זה כולל פיני כניסה, יציאה ואספקת מתח. יש לעיין בגיליון הנתונים של היצרן לתצורות פיני איפוס היסט, פיצוי והפעלה. אידיאלי למעגלי עיצוב אותות ומגברים.
אין נתוני פריסת פינים מפורטים עבור ADS7806PG4.
עיינו ב- גיליון נתונים עבור תצורת פינים מלאה.
יישומים טיפוסיים
ADS7806PG4 מתאים עבור 6 יישוםs: 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.
מומלץ
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.
מומלץ
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.
מומלץ
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.
מומלץ
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.
מומלץ
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.
מומלץ
סיכום מוצרים מומלצים
נתוני עזר הנדסיים עבור ADS7806PG4 — השוואה, הנחיות תכנון ומידע על תאימות.
מדריך בחירה
השוואה עם חלופות
| פרמטר | מוצר זה | 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 |
מבדילים עיקריים
- True bipolar +/-10 V input range in the same through-hole package (לעומתADS7805PG4)
- Pb-free RoHS-compliant ordering code (PG4) (לעומתADS7806P (Pb-bearing legacy))
הערות תכנון
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.
מידע על תאימות
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.
