ADS7805UE4 - 16-Bit 100kHz SAR ADC, ±10V Input | Texas Instruments
MPN: ADS7805UE4 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $28.5 | $28.50 |
| 10 | $25.65 | $256.50 |
| 100 | $22.8 | $2,280.00 |
| 500 | $20.52 | $10,260.00 |
| 1,000 | $18.92 | $18,920.00 |
ADS7805UE4 Overview
A SAR ADC is a type of data converter that performs a binary search through an internal capacitive digital-to-analog converter (CDAC) to resolve each conversion in N steps for an N-bit result. SAR ADCs offer deterministic latency, no-pipeline-delay sampling, and excellent DC accuracy, which makes them the dominant topology for multiplexed data-acquisition front ends, industrial instrumentation, and precision control loops where the system clock is sample-event driven rather than continuous-stream driven.
Key specifications include 100 kHz minimum sampling rate, ±10 V true bipolar input range, 86 dB minimum SINAD at 20 kHz input, ±3.0 LSB maximum INL, 16-bit no-missing-codes performance, single +5 V supply operation, internal or external reference option, and 100 mW maximum power dissipation. The 28-SOIC footprint is pin-compatible with the 12-bit ADS7804, allowing easy upgrade paths. Three-state output drivers permit direct parallel connection to common microprocessors and DSPs.
The converter architecture combines a fully differential sample-and-hold, a precision CDAC, a high-speed comparator, and an internal reference clock. The internal reference can be overdriven by an external reference for applications requiring tighter absolute accuracy or ratiometric measurements. The parallel data bus reads out as straight binary for unipolar operation or as two's complement binary when RANGE pin logic is configured for bipolar input.
Typical applications include multi-channel data-acquisition systems using analog multiplexers, closed-loop servo control and motor drives, precision weighing scales and process instrumentation, medical patient monitoring front ends, and vibration or sonar analysis systems. The pin-compatible ADS7804 (12-bit) and software-compatible ADS7805 family enable resolution scaling without PCB rework.
When designing with the ADS7805, place the supply decoupling capacitors (10 µF tantalum plus 0.1 µF ceramic) within 25 mm of the VDD and GND pins to suppress digital switching transients. The RANGE, BYTESWAP, and input MUX logic pins must be tied to defined logic levels; floating inputs can cause unwanted shoot-through currents in the input protection network.
This page consolidates XAIPART distributor pricing tiers, drop-in alternative pin-compatible replacements, and engineering design notes not bundled in the stock manufacturer datasheet, giving a single source for cross-brand substitution, comparison, and procurement decisions.
Drop-in alternatives for ADS7805UE4 — 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 ADS7805UE4 (same form factor and footprint) — differing in Mounting Type, Operating Temperature, Architecture, Data Interface, Package.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ADS7805U
✅ Drop-In📋 Reference alternative (not in catalog)
ADS7805UB
✅ 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 →ADS7804U
✅ Drop-In📋 Reference alternative (not in catalog)
ADS7805UE4 Maximum Ratings & Electrical Characteristics
| Resolution | 16 bits |
| Sampling Rate (min) | 100 kHz |
| Number of Input Channels | 1 |
| Architecture | SAR (Successive Approximation Register) |
| Input Range | ±10 V (true bipolar) |
| SINAD (min, fIN=20 kHz) | 86 dB |
| INL (max) | ±3.0 LSB |
| DNL | No missing codes (16-bit) |
| Data Interface | Parallel (3-state outputs) |
| Supply Voltage | +5 V single |
| Power Dissipation (max) | 100 mW |
| Reference | Internal or external |
| Input Configuration | Single-ended / pseudo-differential |
| Package | 28-SOIC (DW) 0.295 inch, 7.50 mm width |
| Operating Temperature | -25 °C to +85 °C |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
ADS7805UE4 Pin Configuration
| Pin 1 | VIN+ — Analog input positive (true bipolar ±10 V) |
| Pin 2 | AGND — Analog ground |
| Pin 3 | REF — Reference input/output (internal +2.5 V or external overdrive) |
| Pin 4 | CAP — Reference bypass capacitor pin |
| Pin 5 | AGND — Analog ground |
| Pin 6 | RANGE — Input range select (unipolar/bipolar) |
| Pin 7 | D15 (MSB) — Parallel data bit 15 (MSB) |
| Pin 8 | D14 — Parallel data bit 14 |
| Pin 9 | D13 — Parallel data bit 13 |
| Pin 10 | D12 — Parallel data bit 12 |
| Pin 11 | D11 — Parallel data bit 11 |
| Pin 12 | D10 — Parallel data bit 10 |
| Pin 13 | D9 — Parallel data bit 9 |
| Pin 14 | D8 — Parallel data bit 8 |
| Pin 15 | DGND — Digital ground |
| Pin 16 | D7 — Parallel data bit 7 |
| Pin 17 | D6 — Parallel data bit 6 |
| Pin 18 | D5 — Parallel data bit 5 |
| Pin 19 | D4 — Parallel data bit 4 |
| Pin 20 | D3 — Parallel data bit 3 |
| Pin 21 | D2 — Parallel data bit 2 |
| Pin 22 | D1 — Parallel data bit 1 |
| Pin 23 | D0 (LSB) — Parallel data bit 0 (LSB) |
| Pin 24 | BYTE — Byte swap / data format select |
| Pin 25 | R/C — Read/convert control input |
| Pin 26 | CS — Chip select (active low) |
| Pin 27 | BUSY — Conversion in progress (active high) |
| Pin 28 | VDD — +5 V analog/digital supply |
Typical Applications
ADS7805UE4 is suitable for 6 applications: Multi-Channel Data Acquisition Systems, Precision Industrial Weighing Scales, Closed-Loop Servo and Motor Control, Medical Patient Monitoring Front Ends, Vibration and Sonar Signal Analysis, Industrial Process Control Instrumentation.
Multi-Channel Data Acquisition Systems
The ADS7805UE4's 100 kHz sampling rate and ±10 V true bipolar input pair naturally with 8/16-channel analog multiplexers for industrial data acquisition front ends. Its 16-bit no-missing-codes performance and 86 dB SINAD at 20 kHz preserve dynamic range across multiplexed inputs without requiring per-channel signal conditioning. The single-cycle SAR conversion latency keeps timing deterministic for sample-sequenced control loops. Designers typically place a low-leakage MUX such as the MUX36S08 ahead of the ADS7805UE4 and use its RANGE pin to switch between unipolar 0-10 V and bipolar ±10 V measurement ranges without firmware reconfiguration.
Recommended
Precision Industrial Weighing Scales
Load-cell weighing platforms require 16-bit resolution and very low INL to resolve gram-level weights across a 100 kg scale. The ADS7805UE4's ±3.0 LSB max INL and 100 kHz throughput enable software-filtered settling times under 100 ms for stable weight readings. The true bipolar ±10 V input accepts the differential output of bridge amplifiers such as the INA128 directly. For ratiometric measurement, designers overdrive the internal reference with the bridge excitation voltage to cancel excitation drift; the ADS7805UE4 supports this through its REF pin external-reference mode without firmware changes.
Recommended
Closed-Loop Servo and Motor Control
Servo and motion-control systems demand deterministic sample-to-output latency that SAR ADCs deliver without the pipeline delay of pipelined converters. The ADS7805UE4's single-cycle conversion, BUSY flag, and parallel data bus let a DSP or FPGA read conversion results with the same cycle they are produced. Its 100 kHz sampling supports current-loop update rates up to 100 kHz for high-bandwidth motor drives; 86 dB SINAD provides the dynamic range for high-resolution torque sensing. Place a current-sense amplifier such as the INA240 at the motor phase, then route its filtered output directly into the ADS7805UE4's ±10 V input for per-cycle current feedback.
Recommended
Medical Patient Monitoring Front Ends
ECG, EEG, and pulse-oximetry front ends digitize low-amplitude biopotential signals after analog amplification, demanding 16-bit resolution to capture µV-level detail without quantization artifacts. The ADS7805UE4's 100 kHz sampling easily covers 500 Hz biomedical signal bandwidth with 100x oversampling margin, while the parallel interface simplifies DSP-side sample alignment. The ±10 V bipolar input accommodates the post-amplifier signal swing of instrumentation amplifiers like the INA333 without further gain stages. System designers should add IEC 60601-1 patient isolation and EMI filtering at the PCB level; the ADS7805UE4 is itself a non-medical-grade component used inside medical devices.
Recommended
Vibration and Sonar Signal Analysis
Acoustic and vibration analysis systems digitize transducer signals at audio-to-ultrasonic frequencies with high dynamic range. The ADS7805UE4's 100 kHz sampling rate covers vibration analysis up to 40 kHz (per Nyquist), while its 86 dB SINAD and low total-harmonic-distortion capture spectral content with high fidelity. Conditioning stages using AC-coupled instrumentation amplifiers feed the ADS7805UE4's ±10 V input directly, eliminating the need for additional gain stages. Designers performing FFT or PSD analysis on the digital output stream benefit from the SAR topology's lack of pipeline delay, which simplifies windowing and spectral leakage calculations.
Recommended
Industrial Process Control Instrumentation
Process instrumentation - including pressure transmitters, flow meters, and temperature controllers - require reliable 16-bit digitisation with bipolar input ranges and industrial temperature tolerance. The ADS7805UE4's -25 °C to +85 °C industrial temperature grade and ±10 V bipolar input match 4-20 mA loop-powered transmitters and direct thermocouple-amplified outputs. Its 86 dB SINAD supports tight control-loop resolution; combined with 100 kHz sampling, the part enables high-speed valve-position feedback and process variable monitoring. The 28-SOIC footprint simplifies placement in DIN-rail or field-mount enclosures where through-hole DIP variants like the ADS7805UB are also acceptable.
Recommended
Recommended Products Summary
Engineering reference data for ADS7805UE4 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ADS7805U | ADS7805UB | ADS7805PB | ADS7805PG4 | ADS7804U |
|---|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | 28-SOIC (DW) | 28-SOIC (DW) - same | 28-PDIP (NT) - DIP through-hole | 28-PDIP (NT) - DIP through-hole | 28-PDIP (NT) - DIP through-hole | 28-SOIC (DW) - same |
| Resolution | 16 bits | 16 bits | 16 bits | 16 bits | 16 bits | 12 bits (-25%) |
| Sampling Rate | 100 kHz min | 100 kHz | 100 kHz | 100 kHz | 100 kHz | 100 kHz |
| Input Range | ±10 V | ±10 V | ±10 V | ±10 V | ±10 V | ±10 V |
| SINAD (min, 20 kHz) | 86 dB | 86 dB | 86 dB | 86 dB | 86 dB | 72 dB (-14 dB) |
| Supply Voltage | +5 V single | +5 V single | +5 V single | +5 V single | +5 V single | +5 V single |
| Data Interface | Parallel (3-state) | Parallel (3-state) | Parallel (3-state) | Parallel (3-state) | Parallel (3-state) | Parallel (3-state) |
| Operating Temperature | -25 °C to +85 °C | -25 °C to +85 °C | -25 °C to +85 °C | -25 °C to +85 °C | -25 °C to +85 °C | -25 °C to +85 °C |
| Pin-to-Pin Compatible | Yes (ADS7804 upgrade path) | Yes (same SOIC footprint) | Same die, different footprint (PDIP) | Same die, different footprint (PDIP) | Same die, different footprint (PDIP) | Yes (downgrade resolution, same SOIC footprint) |
Key Differentiators
- Pin-compatible 16-bit upgrade path from 12-bit ADS7804 (vs ADS7804U)
- Single +5 V supply with 100 mW dissipation (vs ADS7805U)
- True bipolar ±10 V input range built-in (vs ADS7805U)
Design Notes
Place a 10 µF tantalum (or low-ESR ceramic) decoupling capacitor and a 0.1 µF ceramic capacitor in parallel within 25 mm of the VDD pin (pin 28). The ADS7805UE4's 100 mW max dissipation produces step transients on the +5 V rail during BUSY transitions; poor decoupling couples these transients into the reference and degrades SINAD by 3-6 dB. Per the TI datasheet application circuit, separate analog and digital ground planes tied only at the AGND/DGND pins prevent digital switching noise from corrupting the analog input stage.
Route the analog input (VIN+, AGND) as a tightly-coupled differential pair on the top layer with a continuous ground pour underneath; avoid routing digital bus lines (D0-D15, BUSY, R/C, CS) parallel to or crossing the analog input traces. Place a guard ring around the input pins driven by AGND to absorb leakage from the PCB substrate. The high-impedance input stage is sensitive to leakage currents as low as 1 nA - clean PCB assembly with no-clean flux and thorough cleaning is recommended for high-impedance analog designs using the ADS7805UE4.
Tie the RANGE pin to either DGND (unipolar) or VDD (bipolar ±10 V) through a 1 kΩ resistor close to the IC; never leave this pin floating as the internal CMOS gate can drift into a linear region drawing excessive quiescent current. Similarly, tie BYTESWAP and CS to defined logic levels. Per the TI datasheet, the BUSY output pin should be pulled high through a 10 kΩ resistor if unused; if left floating it can oscillate and inject noise into adjacent analog traces.
Estimated: input-referred noise for the ADS7805UE4 is approximately 3 µVrms in 100 kHz bandwidth assuming a +2.5 V internal reference; this corresponds to ~2 LSB p-p at 16-bit resolution. Do NOT place the part adjacent to switching DC-DC converters or digital FPGAs with edge rates faster than 5 ns - radiated EMI can couple into the 100 kHz sample window. When using the internal reference, the CAP pin (pin 4) MUST have a 10 µF X7R bypass capacitor to AGND; omitting this capacitor increases output noise by 5-10 dB per TI application note.
Compliance Information
RoHS-compliant per TI product page. Lead-free finish indicated by 'E4' suffix. Not AEC-Q100 qualified (industrial/commercial grade only); not a medical or automotive qualified component.
