ADS7806UG4 - 12-Bit 40kSPS SAR ADC | Texas Instruments
MPN: ADS7806UG4 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $18.5 | $18.50 |
| 10 | $16.2 | $162.00 |
| 100 | $13.75 | $1,375.00 |
| 500 | $11.2 | $5,600.00 |
| 1,000 | $9.85 | $9,850.00 |
ADS7806UG4 Overview
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.
Drop-in alternatives for ADS7806UG4 — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with ADS7806UG4 (same form factor and footprint) — differing in Package, Resolution, Operating Temperature, Data Interface, Input Voltage Range.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ADS7806U
✅ Drop-In📋 Reference alternative (not in catalog)
ADS7806PB
✅ Drop-In📋 Reference alternative (not in catalog)
ADS7807
✅ Drop-In📋 Reference alternative (not in catalog)
ADS7805PB
✅ Drop-In✓ In Stock
$10.95 / Unit
View Datasheet →ADS7805PG4
✅ Drop-In✓ In Stock
$17.9 / Unit
View Datasheet →ADS7806UG4 Maximum Ratings & Electrical Characteristics
| Resolution | 12 bit |
| Sampling Rate | 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 |
| Supply Voltage | 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 |
| Operating Temperature | -40C to +85C |
| Package | 28-SOIC (DW) |
| Pin Compatibility | Pin-compatible with 16-bit ADS7807 |
| RoHS Status | Compliant (G4 suffix indicates Green / lead-free) |
ADS7806UG4 Pin Configuration
| Pin 1 | VANA — Analog supply voltage (+5V) |
| Pin 2 | AGND — Analog ground |
| Pin 3 | REF — Reference voltage input/output (internal 2.5V or external) |
| Pin 4 | IN — Analog input |
| Pin 5 | R1I — Range 1 input resistor node |
| Pin 6 | R1IN — Range 1 input reference |
| Pin 7 | CS — Chip select (active low) |
| Pin 8 | RC — RC timing pin for conversion clock |
| Pin 9 | SHDN — Shutdown (active high) |
| Pin 10 | BUSY — Conversion in progress (active high) |
| Pin 11 | DGND — Digital ground |
| Pin 12 | VDIG — Digital supply voltage (+5V) |
| Pin 13 | DB11/MSB — Data bit 11 (MSB), parallel output |
| Pin 14 | DB10 — Data bit 10, parallel output |
| Pin 15 | DB9 — Data bit 9, parallel output |
| Pin 16 | DB8 — Data bit 8, parallel output |
| Pin 17 | DB7 — Data bit 7, parallel output |
| Pin 18 | DB6 — Data bit 6, parallel output |
| Pin 19 | DB5 — Data bit 5, parallel output |
| Pin 20 | DB4 — Data bit 4, parallel output |
| Pin 21 | DB3 — Data bit 3, parallel output |
| Pin 22 | DB2 — Data bit 2, parallel output |
| Pin 23 | DB1 — Data bit 1, parallel output |
| Pin 24 | DB0/LSB — Data bit 0 (LSB), parallel output |
| Pin 25 | DATACLK — Serial data clock output |
| Pin 26 | SDATA — Serial data output |
| Pin 27 | SYNC — Sync input for serial mode |
| Pin 28 | TAG — Tag input for serial mode |
Typical Applications
ADS7806UG4 is suitable for 6 applications: 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.
Recommended
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.
Recommended
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.
Recommended
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.
Recommended
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.
Recommended
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.
Recommended
Recommended Products Summary
Engineering reference data for ADS7806UG4 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | 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 |
Key Differentiators
- True bipolar ±10V input from single +5V supply (vs ADS7805PB)
- Pin-compatible with 16-bit ADS7807 (vs ADS7807)
- RoHS-compliant lead-free assembly (G4 suffix) (vs ADS7806U)
Design Notes
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.
Compliance Information
G4 suffix indicates TI Green (RoHS-compliant, Pb-free) assembly. Industrial temperature grade -40C to +85C. AEC-Q100 not applicable (industrial-grade part).
