ADS7810U/1KG4 - 12-Bit 800kHz SAR ADC | Texas Instruments
MPN: ADS7810U/1KG4 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $14.85 | $14.85 |
| 10 | $13.42 | $134.20 |
| 100 | $11.78 | $1,178.00 |
| 500 | $10.45 | $5,225.00 |
| 1,000 | $9.32 | $9,320.00 |
ADS7810U/1KG4 Overview
An SAR ADC (Successive Approximation Register analog-to-digital converter) is a precision data-conversion architecture that uses a binary-search algorithm against an internal capacitive DAC to resolve an analog input one bit per clock cycle, producing deterministic latency and zero pipeline delay. In the broader data-converter hierarchy, SAR ADCs sit between flash converters (fastest, lowest resolution) and sigma-delta ADCs (slowest, highest resolution), and they are the dominant choice for 8- to 18-bit industrial, instrumentation, and process-control applications.
Key features include an internal 2.5 V reference (with external-reference override option), a complete S/H, internal clock, self-bipolar input scaling that supports true +/-10 V swing, and a parallel data bus with read-only or write-then-read handshake modes. The 28-SOIC package provides robust mechanical handling for socketed designs and through-hole-style rework flows, while still being surface-mount-compatible for automated assembly.
The ADS7810 architecture combines a charge-redistribution capacitive DAC with a low-noise comparator and on-chip clock generator, eliminating the need for an external sampling clock. The internal reference is trimmed for low drift, and the bipolar input network uses precision thin-film resistors for accurate gain, which is what enables the +/-10 V input range from a single-ended source on a +/-5 V analog supply.
Typical applications include industrial process control, data acquisition systems, instrumentation, portable or bench-top test equipment, and optical or analytical front-ends where mid-resolution 12-bit conversion at sub-microsecond throughput is required. The wide +/-10 V input also makes it well suited to legacy 4-20 mA loop interfaces and motor-control position feedback.
When designing with this ADC, pay close attention to the analog and digital supply decoupling network: at least 10 uF tantalum and 0.1 uF ceramic at each AVdd and DVdd pin, with the ground-return path kept separate to prevent digital switching noise from coupling into the SAR comparator. A small RC anti-alias filter (typically 100 ohm and 1 nF) at the input is recommended to limit wideband noise into the input network.
This page synthesizes distributor pricing, drop-in same-package alternatives, and practical design notes not found in the manufacturer datasheet. The /1KG4 suffix designates a 1,000-piece tape-and-reel packaging variant with green (Pb-free, RoHS-compliant) material set; the underlying die and electrical specifications are identical to the standard ADS7810U.
Drop-in alternatives for ADS7810U/1KG4 — 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 ADS7810U/1KG4 (same form factor and footprint) — differing in Package, Resolution, Architecture, Sampling Rate, Data Interface.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ADS7810U/1K
✅ Drop-In📋 Reference alternative (not in catalog)
ADS7810U
✅ Drop-In📋 Reference alternative (not in catalog)
ADS7810UE4
✅ Drop-In📋 Reference alternative (not in catalog)
ADS7810UB/1KE4
✅ Drop-In📋 Reference alternative (not in catalog)
ADS7813UB/1K
✅ Drop-In✓ In Stock
$9.85 / Unit
View Datasheet →ADS7807PBG4
✅ Drop-In✓ In Stock
$11.85 / Unit
View Datasheet →ADS7810U/1KG4 Maximum Ratings & Electrical Characteristics
| Resolution | 12 bits |
| Architecture | SAR (Successive Approximation Register) |
| Number of Inputs | 1 single-ended |
| Sampling Rate | 800 kHz |
| Throughput Time | 1.25 us |
| Input Voltage Range | +/-10 V (true bipolar) |
| Analog Supply Voltage | +/-5 V |
| Digital Supply Voltage | 5 V |
| SINAD | 69 dB minimum (250 kHz input) |
| INL (max) | +/-3/4 LSB |
| DNL (max) | +/-1 LSB |
| Reference | Internal 2.5 V, external override option |
| Data Interface | Parallel with output latches |
| Sample-and-Hold | Integrated |
| Clock | Internal |
| Package | 28-SOIC (7.50 mm body width) |
| Mounting Type | Surface Mount |
| Operating Temperature | -40C to +85C |
| RoHS Status | Compliant (Pb-free) |
| Packaging Variant | /1KG4 = Tape & Reel, 1,000 pcs/reel, green material set |
ADS7810U/1KG4 Pin Configuration
| Pin 1 | IN — Analog input (true bipolar +/-10 V) |
| Pin 2 | AGND — Analog ground |
| Pin 3 | REF — Reference voltage (internal 2.5 V, external override) |
| Pin 4 | AGND — Analog ground |
| Pin 5 | AVDD — Analog +5 V supply |
| Pin 6 | AVDD — Analog +5 V supply |
| Pin 7 | AVSS — Analog -5 V supply |
| Pin 8 | AVSS — Analog -5 V supply |
| Pin 9 | AGND — Analog ground |
| Pin 10 | DVSS — Digital ground |
| Pin 11 | DVDD — Digital +5 V supply |
| Pin 12 | CS — Chip select (active low) |
| Pin 13 | RD — Read strobe (active low) |
| Pin 14 | BUSY — Conversion in progress (active high) |
| Pin 15 | TAG — Tag input for read-with-tag mode |
| Pin 16 | BYTE — Byte-mode select (high = 12-bit, low = 8+4 nibble) |
| Pin 17 | D11 — Data bit 11 (MSB) |
| Pin 18 | D10 — Data bit 10 |
| Pin 19 | D9 — Data bit 9 |
| Pin 20 | D8 — Data bit 8 |
| Pin 21 | D7 — Data bit 7 |
| Pin 22 | D6 — Data bit 6 |
| Pin 23 | D5 — Data bit 5 |
| Pin 24 | D4 — Data bit 4 |
| Pin 25 | D3 — Data bit 3 |
| Pin 26 | D2 — Data bit 2 |
| Pin 27 | D1 — Data bit 1 |
| Pin 28 | D0 — Data bit 0 (LSB) |
Typical Applications
ADS7810U/1KG4 is suitable for 6 applications: Industrial Process Control & Data Acquisition, Portable Test & Measurement Instrumentation, Optical & Analytical Sensor Front-Ends, Motor Control Position & Current Feedback, Legacy 4-20 mA Loop Digitizers, Audio-Band Signal Digitization & DSP Front-End.
Industrial Process Control & Data Acquisition
The ADS7810U/1KG4 fits industrial process control with its 12-bit, 800 kHz SAR architecture and true bipolar +/-10 V single-ended input range, which lets it digitize 4-20 mA loop drops and +/-10 V transducer signals directly from +/-5 V analog supplies without external level shifters. The 69 dB minimum SINAD at 250 kHz and monotonic +/-3/4 LSB INL ensure closed-loop control systems receive accurate feedback without missing codes that could cause oscillation. Recommended companion parts: ADS7818PB (12-bit unipolar variant) for 0-5 V channels, REF02 for external reference upgrade, and ISO7221 for digital isolation of the parallel bus.
Recommended
Portable Test & Measurement Instrumentation
The ADS7810U/1KG4 is a strong fit for bench-top and portable test equipment where 12-bit resolution at 800 kHz sampling is sufficient for digitizing audio-band and low-RF signals. The integrated sample-and-hold, internal reference, and internal clock eliminate several external components - critical for compact portable form factors. Operating from +/-5 V analog and 5 V digital supplies, it can be powered by linear regulators fed from a 9 V or 12 V battery, simplifying the power tree. Recommended companion parts: OPA2277 (low-noise op-amp input buffer), REF02 (precision 5 V reference), and AD8138 (single-ended-to-differential input driver if needed).
Recommended
Optical & Analytical Sensor Front-Ends
The ADS7810U/1KG4's 800 kHz throughput and true bipolar input range suit optical and analytical instruments such as photodiode-array front-ends, gas analyzers, and spectrophotometers that produce +/-10 V output signals from transducer chains. The 12-bit dynamic range is more than adequate for the typical 60-80 dB signal-to-noise requirement of mid-resolution analytical instruments, and the 1.25 us conversion time allows per-channel sample rates well above the Nyquist requirement for kHz-bandwidth transducers. The 28-SOIC package is also easier to socket and rework in prototype instrument builds than smaller QFN packages. Recommended companion parts: OPA129 (low-bias-current FET-input amplifier for photodiode front-end) and DAC8830 (companion 16-bit DAC for calibration).
Recommended
Motor Control Position & Current Feedback
The ADS7810U/1KG4 supports motor-control designs that require sampling both position-feedback signals and current-sense amplifier outputs with deterministic latency. SAR ADCs are preferred over sigma-delta for motor control because they have zero pipeline delay, so the FOC (field-oriented-control) loop sees no latency between current measurement and PWM update. The +/-10 V input range is well-matched to the output of typical current-sense amplifiers and resolver-to-digital converter interfaces, and the 1.25 us throughput allows sampling 4-6 channels multiplexed in the typical 10-20 kHz motor control loop. Recommended companion parts: DRV8301 (three-phase motor gate driver) and ADS7818PB (secondary unipolar channel for bus voltage measurement).
Recommended
Legacy 4-20 mA Loop Digitizers
The ADS7810U/1KG4 is ideal for digitizing 4-20 mA industrial current loops because its +/-10 V true bipolar input range covers the full 1-5 V drop across a 250 ohm sense resistor with substantial headroom. The 12-bit resolution provides 0.024 percent of full-scale resolution, more than adequate for SCADA and DCS-style monitoring. The bipolar input also lets the ADC measure the full loop-fault range including negative transients during open-circuit detection, which unipolar ADCs cannot capture. The internal reference and clock reduce the analog-front-end BOM to a single 250 ohm sense resistor and an input protection TVS. Recommended companion parts: XTR105 (4-20 mA loop transmitter companion) and TVS2200 (loop input protection).
Recommended
Audio-Band Signal Digitization & DSP Front-End
The ADS7810U/1KG4 fits mid-fidelity audio-band digitization such as professional audio metering, broadcast signal monitoring, and vibration-analysis front-ends where 12-bit resolution is acceptable and 800 kHz sampling provides substantial headroom above the 20 kHz audio band. The 69 dB SINAD at 250 kHz input translates to roughly 11.2 effective bits at DC, which is suitable for FFT-based spectral analysis of motor-bearing vibration or acoustic emissions. The parallel data interface allows direct connection to a DSP or FPGA without intermediate serialization, reducing latency in real-time audio processing. Recommended companion parts: PCM1802 (companion 24-bit audio ADC when higher resolution is needed) and TMS320F28335 (DSP processor for FFT analysis).
Recommended
Recommended Products Summary
Engineering reference data for ADS7810U/1KG4 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ADS7810U/1K | ADS7810U | ADS7810UE4 | ADS7810UB/1KE4 | ADS7813UB/1K |
|---|---|---|---|---|---|---|
| Package | 28-SOIC | 28-SOIC | 28-SOIC | 28-SOIC | 28-SOIC | 28-SOIC |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Resolution | 12 bits | 12 bits | 12 bits | 12 bits | 12 bits | 12 bits |
| Sampling Rate | 800 kHz | 800 kHz | 800 kHz | 800 kHz | 800 kHz | 40 kHz |
| Input Voltage Range | +/-10 V | +/-10 V | +/-10 V | +/-10 V | +/-5 V | +/-10 V |
| Analog Supply | +/-5 V | +/-5 V | +/-5 V | +/-5 V | +/-5 V | +/-5 V |
| Reference | Internal 2.5 V (external option) | Internal 2.5 V | Internal 2.5 V | Internal 2.5 V | Internal 2.5 V | Internal 2.5 V |
| Data Interface | Parallel with latches | Parallel with latches | Parallel with latches | Parallel with latches | Parallel with latches | Serial |
| RoHS Status | Green (Pb-free) | Non-G4 (older material set) | Non-G4 (older material set) | Non-green (E4) | Non-green (E4) | Green (Pb-free) |
| Throughput Time | 1.25 us | 1.25 us | 1.25 us | 1.25 us | 1.25 us | 25 us |
Key Differentiators
- True bipolar +/-10 V input without external level shifting (vs ADS7818PB)
- Complete integration: S/H, reference, clock, and parallel interface (vs ADS7813UB/1K)
- 8x higher sampling rate than the ADS7813 family (vs ADS7813UB/1K)
- Green (RoHS) material set, modern production (vs ADS7810UE4)
Design Notes
Decouple each AVDD and AVSS pin with at least 10 uF tantalum in parallel with 0.1 uF ceramic, placed within 5 mm of the package pin. The DVDD pin requires the same 10 uF + 0.1 uF combination. Use a single point ground at the ADC's AGND pin and route analog and digital ground returns separately back to that point to prevent digital switching currents from coupling into the SAR comparator. Star-ground layout is strongly preferred over split-plane layout for this 12-bit SAR converter.
Estimated: with a 4-layer FR4 board (1 oz copper) and a 28-SOIC thermal pad of approximately 5x7 mm copper area, the junction-to-ambient thermal resistance is approximately 60-70 C/W. Because the ADS7810U/1KG4 typically dissipates only 100-150 mW total (analog plus digital supply), the junction temperature rise is approximately 7-10 C above ambient, so no heatsink is needed. However, the exposed top of the SOIC should be kept clear of heat-generating components and direct airflow to avoid self-heating during long conversion bursts.
Add a 100 ohm series resistor and 1 nF X7R capacitor as a simple RC anti-alias filter at the analog input pin. With 100 ohm and 1 nF, the filter cutoff is approximately 1.6 MHz, which is just above the 800 kHz Nyquist and well above the 1.25 us conversion-time-limited input bandwidth, providing adequate aliasing rejection without distorting the input. Place the resistor close to the input pin and the capacitor close to the ADC's ground return. This filter also protects the input from ESD events when combined with a TVS diode.
Do not connect digital ground and analog ground planes together underneath the ADC package - this creates a ground-loop path that couples digital switching noise into the SAR comparator. Use a single point connection at the ADC's AGND pin. Do not float the REF pin - the internal reference requires the bypass capacitor on this pin to be 10 uF tantalum in parallel with 0.1 uF ceramic. The BYTE pin must be tied to either DVDD (12-bit mode) or DVSS (8+4 nibble mode) - it cannot be left floating.
Compliance Information
The /G4 suffix in /1KG4 indicates TI's green (Pb-free, RoHS-compliant) material set. REACH and conflict-minerals compliance are inherited from TI's standard policies; specific statements are not provided on the distributor listings retrieved. AEC-Q100 not applicable - this is an industrial/consumer-grade part.
