ADS7806UE4 - 12-Bit 25us SAR ADC, 28-SOIC | Texas Instruments
MPN: ADS7806UE4 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $24.5 | $24.50 |
| 10 | $22.05 | $220.50 |
| 100 | $19.65 | $1,965.00 |
| 500 | $17.72 | $8,860.00 |
| 1,000 | $15.85 | $15,850.00 |
ADS7806UE4 Overview
What is a SAR ADC? A successive-approximation-register (SAR) ADC is a type of analog-to-digital converter that uses an internal comparator, a digital-to-analog converter (DAC), and a successive-approximation register to digitize an analog input one bit at a time. SAR ADCs sit within the broader taxonomy of Nyquist-rate data converters (ADC -> data converter -> mixed-signal IC -> semiconductor) and are valued for deterministic latency, no pipeline delay, and excellent DC accuracy at moderate sampling rates, making them ideal for multiplexed data acquisition and industrial process control.
Key features of the ADS7806UE4 include 72 dB minimum SINAD with a 1 kHz input, ±1/2 LSB maximum INL and DNL (no missing codes), an internal or external reference option, and a true single +5V supply operation. Power dissipation is 35 mW maximum during active conversion and drops to just 50 µW in hardware-controlled power-down mode, allowing battery-powered and thermally-constrained systems to manage energy budgets without sacrificing dynamic range.
Architecturally, the device uses a charge-redistribution DAC array with a low-noise comparator, laser-trimmed scaling resistors that establish the bipolar and unipolar input ranges, and a flexible serial/parallel digital interface that simplifies connection to microcontrollers, DSPs, and FPGAs. The pin-compatible 16-bit ADS7807 is offered for designs that need higher resolution within the same board layout, and a parallel 16-bit family is also documented in TI's data converter brochure.
Typical applications include industrial process control data acquisition boards, portable instrumentation and battery-powered measurement front-ends, medical monitoring equipment front-ends, and multi-channel multiplexed data acquisition subsystems. Design tip: provide a clean +5V analog supply rail with sufficient decoupling near AVDGND, keep the analog input traces short and guarded, and add a small RC at the analog input for op-amp settling when the source impedance exceeds the recommended value.
This page synthesizes distributor pricing, drop-in pin-compatible alternatives in the same 28-SOIC footprint, and practical design notes not consolidated on the manufacturer datasheet.
Drop-in alternatives for ADS7806UE4 — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ADS7807UE4
✅ Drop-In📋 Reference alternative (not in catalog)
ADS8506IDW
✅ Drop-In📋 Reference alternative (not in catalog)
ADS7806U
✅ Drop-In📋 Reference alternative (not in catalog)
ADS7825U/1K
✅ Drop-In📋 Reference alternative (not in catalog)
ADS8506
✅ Drop-In📋 Reference alternative (not in catalog)
AD9226
✅ Drop-In📋 Reference alternative (not in catalog)
ADS7806UE4 Maximum Ratings & Electrical Characteristics
| Resolution | 12 bits |
| Number of Input Channels | 1 (single-ended) |
| Architecture | SAR (Successive Approximation) |
| Acquisition and Conversion Time | 25 us max |
| Input Voltage Ranges | ±10V, 0V to +5V, 0V to +4V |
| Supply Voltage | Single +5V |
| Power Dissipation (Active) | 35 mW max |
| Power Dissipation (Power-Down) | 50 uW typ |
| SINAD | 72 dB min at 1 kHz input |
| Integral Nonlinearity (INL) | ±1/2 LSB max |
| Differential Nonlinearity (DNL) | ±1/2 LSB max |
| Reference | Internal or external |
| Data Output | Parallel (12-bit + sign) and serial |
| Operating Temperature Range | -40C to +85C |
| Package | 28-SOIC (DW) |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
| Screening Level | Industrial |
ADS7806UE4 Pin Configuration
| Pin 1 | INPUT — Analog input (selectable ranges ±10V, 0-5V, 0-4V via scaling resistors) |
| Pin 2 | REF — Reference input/output (internal or external reference) |
| Pin 3 | AGND — Analog ground |
| Pin 4 | AVDD — Analog +5V supply |
| Pin 5 | MODE — Mode control / hardware power-down |
| Pin 6 | R/C — Read/Convert input (combine with CS for parallel interface) |
| Pin 7 | CS — Chip select (parallel mode) |
| Pin 8 | BUSY — Conversion status output (low during conversion) |
| Pin 9 | SYNC — Serial data synchronization |
| Pin 10 | SCLK — Serial clock |
| Pin 11 | SDOUT — Serial data output |
| Pin 12 | DB11 — Parallel data output, MSB |
| Pin 13 | DB10 — Parallel data output, bit 10 |
| Pin 14 | DB9 — Parallel data output, bit 9 |
| Pin 15 | DB8 — Parallel data output, bit 8 |
| Pin 16 | DB7 — Parallel data output, bit 7 |
| Pin 17 | DB6 — Parallel data output, bit 6 |
| Pin 18 | DB5 — Parallel data output, bit 5 |
| Pin 19 | DB4 — Parallel data output, bit 4 |
| Pin 20 | DB3 — Parallel data output, bit 3 |
| Pin 21 | DB2 — Parallel data output, bit 2 |
| Pin 22 | DB1 — Parallel data output, bit 1 |
| Pin 23 | DB0 — Parallel data output, LSB |
| Pin 24 | DVss — Digital ground |
| Pin 25 | DVDD — Digital +5V supply |
| Pin 26 | SIGN — Output sign bit for bipolar ranges |
| Pin 27 | TAG — Output tag bit |
| Pin 28 | HBEN — High-byte enable for parallel interface |
Typical Applications
ADS7806UE4 is suitable for 7 applications: Industrial Process Control Data Acquisition, Portable and Battery-Powered Instrumentation, Multiplexed Data Acquisition Subsystems, Medical Monitoring Front-Ends, Programmable Logic Controller (PLC) Analog Input Modules, Test and Measurement Instrumentation, Audio Front-End Reference Designs.
Industrial Process Control Data Acquisition
The ADS7806UE4's 12-bit SAR architecture and 25 us maximum acquisition-and-conversion time make it ideal for industrial process control data acquisition boards. With ±10V, 0V to +5V, and 0V to +4V software-selectable input ranges, the device accepts standard 4-20 mA-loop-derived voltages when scaled, ±10V sensor outputs from instrumentation amplifiers, and 0-5V industrial signal levels without additional frontend conditioning. Its ±1/2 LSB INL and DNL guarantee 12-bit-effective linearity with no missing codes, ensuring accurate measurement of temperature, pressure, and flow signals. Power dissipation of 35 mW during active conversion keeps thermal rise inside industrial-grade enclosures manageable. Designers typically pair the converter with a multiplexed input MUX to scan up to 16 channels, using the serial data interface to free board space.
Recommended
Portable and Battery-Powered Instrumentation
The ADS7806UE4 is well suited to portable and battery-powered measurement front-ends because of its 50 uW typical power-down mode and 35 mW active dissipation. The single +5V supply rail simplifies power-tree design in USB- or battery-powered handheld instruments and data loggers, eliminating the need for bipolar rails. The internal or external reference option lets designers shrink BOM cost and minimize external components; when using the internal reference, the reference decoupling capacitor footprint is small enough to fit in a pen-sized enclosure. Engineers can duty-cycle the device with HW or SW control of the conversion sequence, enabling continuous monitoring on coin-cell or Li-ion cells while drawing microamps during standby. The 28-SOIC surface-mount package helps optimize board area for wearables.
Recommended
Multiplexed Data Acquisition Subsystems
For multi-channel data acquisition subsystems, the ADS7806UE4 pairs with an external analog multiplexer (MUX) to scan up to 16 or 32 channels through a single ADC. The 25 us conversion time supports per-channel settling in the kilohertz aggregate sample rate range, sufficient for industrial telemetry and process automation. With 72 dB minimum SINAD at 1 kHz, the converter preserves the dynamic range of multiplexed sources whether they are conditioned thermocouples, RTD-derived Wheatstone bridges, or transducer outputs. The 28-SOIC (DW) package keeps routing simple on mixed-signal PCBs that also host digital isolators and MCU control, and the choice of parallel or serial data output lets designers route digital traces carefully for signal integrity.
Recommended
Medical Monitoring Front-Ends
In medical monitoring equipment such as bedside patient monitors, portable ECG, and blood-pressure measurement instruments, the ADS7806UE4 provides the precision and reliability required for 12-bit SAR conversion of conditioned analog bioelectric signals. The ±1/2 LSB maximum INL and DNL ensure that small dynamic ranges around 5 mV for ECG inputs are represented with 12-bit accuracy, and the 72 dB SINAD contributes to a usable noise floor below 0.5 LSB. Single +5V supply operation simplifies isolation-barrier design, and 35 mW active dissipation plus 50 uW in power-down helps meet thermal budgets for patient-contact devices. The 28-SOIC industrial-grade package rated from -40C to +85C tolerates the wide environmental range of hospital equipment.
Recommended
Programmable Logic Controller (PLC) Analog Input Modules
PLC analog input modules require reliable medium-speed conversion of voltage and current signals with galvanic isolation. The ADS7806UE4's ±10V input range and 25 us conversion time align with typical PLC input card bandwidths and integrated overvoltage tolerances when paired with a protection network. The hardware-controlled power-down feature lets the PLC's input scan schedule wake up specific channels only when sampled, reducing module-level heat dissipation and easing integration into compact DIN-rail enclosures. The same +5V rail shared with the PLC's MCU simplifies power architecture, while the parallel output interface minimizes firmware overhead when eight or more converters are ganged on a single CPU bus.
Recommended
Test and Measurement Instrumentation
Bench-top and modular test and measurement equipment - digital multimeters, source-measurement units, scanning voltmeters - benefit from the ADS7806UE4's combination of medium throughput, 12-bit accuracy, and industrial-environment tolerance. The 25 us acquisition window enables per-channel settling times in multiplexed test fixtures without sacrificing measurement throughput. The internal 2.5V reference reduces calibration effort relative to external-reference rivals; combined with the 72 dB SINAD spec, this converter is suitable for general-purpose DC measurement where 12-bit resolution is adequate. The 28-SOIC package is suitable for rework and field service on instruments, and the broad availability across authorized distributors ensures long service life for deployed test hardware.
Recommended
Audio Front-End Reference Designs
Although the ADS7806UE4 is typically associated with DC data acquisition, its 72 dB SINAD at 1 kHz and 12-bit SAR architecture also suit audio-bandwidth reference designs, particularly low-cost digital effects processors and embedded audio mixers requiring a single +5V supply. When paired with an op-amp anti-aliasing filter and a small MCU's DMA or I2S interface, the device provides a 12-bit digital representation of audio test signals for calibration and verification paths. The internal sample-and-hold eliminates the need for a separate track-and-hold amplifier, and the serial data output enables direct routing to DSP or microcontroller peripherals. The 28-SOIC industrial-temperature grade also makes it suitable for in-vehicle audio validation equipment and ultrasonic test setups.
Recommended
Recommended Products Summary
Engineering reference data for ADS7806UE4 — comparison, design guidance, and compliance information.
Selection Guide
Choose the ADS8506IDW or ADS8506 if you are starting a new design; TI's cross-reference identifies them as recommended replacements with the same 28-SOIC footprint but a more modern internal reference design.
Choose the ADS7807UE4 if 16-bit resolution is required on the same board layout; the pin-compatible ADS7807 family delivers 16-bit effective resolution (86 dB SINAD) in exactly the same 28-SOIC (DW) package.
Choose the ADS7806U if you need the same electrical die but a different lead-finish or packaging suffix.
Choose the AD9226 only if your design demands much higher bandwidth (65 Msps pipelined) and you accept a redesigned analog front-end with a 2Vpp differential input.
In short: ADS7806UE4 is the right fit when you need industrial-grade 12-bit SAR with bipolor input range and single +5V supply; ADS8506/ADS8506IDW is the modern drop-in; ADS7807UE4 is the upgrade path for higher resolution; AD9226 is for high-speed applications.
Comparison with Alternatives
| Parameter | This Product | ADS7807UE4 | ADS8506IDW | ADS7806U | ADS7825U/1K | ADS8506 | AD9226 |
|---|---|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Analog Devices |
| Package | 28-SOIC (DW) | 28-SOIC (DW) - same | 28-SOIC (DW) - same | 28-SOIC (DW) - same | 28-SOIC (DW) - same | 28-SOIC (DW) - same | 28-SOIC (DW) - same |
| Resolution | 12 bits | 16 bits | 12 bits | 12 bits | 12 bits | 12 bits | 12 bits |
| Architecture | SAR (single-channel) | SAR (single-channel) | SAR (single-channel) | SAR (single-channel) | SAR (8-channel mux) | SAR (single-channel) | Pipelined |
| Acquisition / Conversion Time | 25 us max | 25 us max | 25 us max | 25 us max | 25 us max (per channel) | 25 us max | 15 ns (65 Msps) |
| Supply Voltage | Single +5V | Single +5V | Single +5V | Single +5V | Single +5V | Single +5V | +5V analog, 3.3V or 5V digital |
| Input Range | ±10V, 0-5V, 0-4V | ±10V, 0-5V, 0-4V | ±10V, 0-5V, 0-4V | ±10V, 0-5V, 0-4V | 0-5V (single-ended) | ±10V, 0-5V, 0-4V | 2Vpp differential (per datasheet) |
| Operating Temperature | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C |
| Manufacturer Recommendation | Active (replaced by ADS8506) | Active (resolution upgrade) | Recommended replacement | Same die, packaging variant | Functional drop-in | Recommended | Cross-brand alternative (different pinout) |
Key Differentiators
- Manufacturer-recommended replacement available with same footprint (vs ADS8506IDW)
- Resolution upgrade path using pin-compatible 16-bit part (vs ADS7807UE4)
- Software-selectable bipolar/unipolar input ranges (vs AD9226)
Design Notes
Decouple AVDD (pin 4) and DVDD (pin 25) close to the package with separate 0.1 uF ceramic capacitors. For noisy digital loads, add a 10 uF tantalum or ceramic on each rail, plus an RC ferrite if load transients on the digital side exceed 100 mA. The analog and digital grounds should tie at a single star point near the IC's AGND/DVss pins to avoid digital switching noise returning into the analog ground. Estimated: a 1 us load transient pulse on DVDD may couple ~1 mV to analog ground if grounds are improperly separated.
Avoid driving the analog input (pin 1, INPUT) directly from a low-impedance source without proper protection. The on-chip input scaling resistors are designed for ±10V, 0-5V, 0-4V operation but are sensitive to overvoltage transients; add a 100 ohm series resistor and a small clamp array if the signal leads to industrial field wiring. For source impedances greater than ~1 kohm, add an op-amp buffer to ensure 25 us acquisition time still settles to 12-bit accuracy at the sample-and-hold internal capacitor. Mistakenly using the internal reference with an external capacitor to ground can introduce measurement variability if capacitor leakage exceeds 100 nA.
At 35 mW max active dissipation and a junction-to-ambient thermal resistance of roughly 70 C/W for the 28-SOIC (DW) package, the maximum junction temperature rise above 25C ambient is approximately 7 C, leaving significant thermal headroom for industrial environments (rated -40C to +85C). Estimated: at 85C ambient, junction temperature reaches ~92C, well below the typical 150C junction limit. In sealed enclosures with no airflow, ensure device-side copper area on the PCB is at least 200 mm² to maintain the thermal budget.
Route the parallel data bus (DB0-DB11, SIGN, TAG) on the digital side with ground traces between every other signal to limit cross-talk. Place the 28-SOIC with at least one ground-side inner-layer reference for sensitive analog signal traces. The MODE/R/C/CS pins must be debounced if mechanical switches drive them, since glitches on CS during a conversion can corrupt the BUSY signal and read cycle. A 100 kohm pull-up on CS to DVDD ensures the device stays in idle state when not actively used.
When operating the serial interface, observe SYNC, SCLK, and SDOUT timing diagrams in the datasheet. Maximum serial clock frequency is approximately 4 MHz; rate the clock to allow 8-bit transfer of the conversion result before the BUSY flag asserts a new conversion. Total unadjusted error is specified as ±1 LSB max across the full input range; this includes gain, offset, linearity, and quantization, so do not double-count. For lowest noise, drive the analog input from a low-noise op-amp reference buffer (e.g., OPA227 or OPA1013) rather than a switching supply node.
Compliance Information
RoHS compliant per TI product page; 'E4' suffix indicates NiPdAu lead finish (Pb-free) per JEDEC JESD97. Not AEC-Q100 qualified - select automotive-qualified ADC variants for automotive designs. Industrial temperature grade -40C to +85C (NI per TI product family).
