ADS7825UE4 - 16-Bit 4-Ch 40kSPS ADC | Texas Instruments
Référence : ADS7825UE4 ✓ Actif| Qté | Prix unitaire | Total |
|---|---|---|
| 1 | $27.5 | $27,50 |
| 10 | $24.75 | $247,50 |
| 100 | $21.85 | $2 185,00 |
| 500 | $19.45 | $9 725,00 |
| 1 000 | $17.2 | $17 200,00 |
ADS7825UE4 Présentation
An analog-to-digital converter (ADC) is a mixed-signal integrated circuit that converts a continuous-time, continuous-amplitude analog voltage into a discrete-time, discrete-amplitude digital code. Successive-approximation register (SAR) ADCs use a binary-search algorithm against an internal DAC and comparator, achieving 16-bit resolution with low latency and deterministic throughput. Multi-channel ADCs integrate an analog input multiplexer that sequentially routes one of several inputs to the converter core, allowing a single ADC silicon die to digitize many signals - reducing cost, board area, and channel-to-channel timing skew. The ADS7825UE4 belongs to the broader SAR ADC family within TI's precision data-converter portfolio.
Key features include 25 us maximum acquisition-plus-conversion time, +/-2.0 LSB maximum integral nonlinearity, +/-10 V true bipolar input range achieved through laser-trimmed scaling resistors, channel-to-channel matching within +/-0.1%, and a choice of parallel (8/16-bit) or serial data output. The internal 2.5 V reference eliminates an external reference IC in many designs. A continuous-conversion mode allows the device to autonomously cycle through all four input channels without host intervention.
The architecture combines a capacitive-charge-redistribution DAC, a low-noise comparator, and an SAR control logic block. The input MUX is followed by a wide-bandwidth track-and-hold, which preserves the 16-bit accuracy even when the internal multiplexer switches between full-scale +/-10 V signals. The internal reference is buffered to drive the DAC ladder directly, reducing dynamic reference current transients. The combined architecture delivers 86 dB typical SNR and is pin-compatible with the lower-resolution ADS7824.
Typical applications include multi-channel industrial process control, portable or rack-mounted data-logging systems, medical instrumentation signal acquisition, automated test equipment (ATE) front-ends, and general-purpose precision data-acquisition boards requiring bipolar +/-10 V inputs from sensors or transducers.
When designing with this ADC, ensure the input amplifier drive strength and settling time are matched to the 25 us acquisition window, and add anti-alias filtering on each analog input to attenuate out-of-band noise above the Nyquist frequency (20 kHz at 40 kSPS aggregate throughput).
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone, giving engineers a single reference for selecting, sourcing, and qualifying the ADS7825UE4.
Alternatives de remplacement direct pour ADS7825UE4 — même boîtier, compatible broche à broche. Les références à boîtier différent nécessitant une retouche du PCB sont exclues.
Variantes de cette série
Modèles de la même série directement compatibles avec ADS7825UE4 (même facteur de forme et même empreinte) — différant par Package, Data Interface, Number of Input Channels, Sampling Rate, Input Type.
Outil de comparaison rapide — sélectionnez des références alternatives pour une comparaison côte à côte :
ADS7825U
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
ADS7824UB/1KG4
✅ Remplacement direct✓ En stock
$9.4 / unité
Voir la fiche technique →ADS7824UB/1KG4
✅ Remplacement direct✓ En stock
$9.4 / unité
Voir la fiche technique →ADS7824PG4
✅ Remplacement direct✓ En stock
$11.1 / unité
Voir la fiche technique →ADS7822PBG4
✅ Remplacement direct✓ En stock
$2.1 / unité
Voir la fiche technique →ADS7825UE4 Valeurs maximales et caractéristiques électriques
| Résolution | 16 bits |
| Number of Input Channels | 4 (single-ended, multiplexed) |
| Fréquence d'échantillonnage | 40 kSPS (max) |
| Acquisition + Conversion Time | 25 us (max) |
| Plage de tension d'entrée | +/-10 V (bipolar, laser-trimmed scaling) |
| Integral Nonlinearity (INL) | +/-2.0 LSB (max) |
| Channel-to-Channel Matching | +/-0.1% |
| Tension d'alimentation | +5 V single supply |
| Power Dissipation | 50 mW (max during conversion) |
| Data Interface | Parallel (8/16-bit) or Serial |
| Internal Reference | +2.5 V (on-chip) |
| Température de fonctionnement | -40C to +85C |
| Boîtier | 28-SOIC (DW, 0.295 in / 7.50 mm width) |
| Type de montage | Surface Mount |
| Pin-Compatible With | ADS7824 (12-bit version, same 28-SOIC pinout) |
| Statut RoHS | Compliant |
Configuration des broches de ADS7825UE4
| Broche 1 | CH0 — Analog input channel 0 |
| Broche 2 | CH1 — Analog input channel 1 |
| Broche 3 | CH2 — Analog input channel 2 |
| Broche 4 | CH3 — Analog input channel 3 |
| Broche 5 | AGND — Analog ground |
| Broche 6 | REF — +2.5 V internal reference (bypass to AGND) |
| Broche 7 | VREF — Reference voltage input/output |
| Broche 8 | DGND — Digital ground |
| Broche 9 | DB0 — Parallel data bit 0 (LSB) |
| Broche 10 | DB1 — Parallel data bit 1 |
| Broche 11 | DB2 — Parallel data bit 2 |
| Broche 12 | DB3 — Parallel data bit 3 |
| Broche 13 | DB4 — Parallel data bit 4 |
| Broche 14 | DB5 — Parallel data bit 5 |
| Broche 15 | DB6 — Parallel data bit 6 |
| Broche 16 | DB7 — Parallel data bit 7 |
| Broche 17 | DB8 — Parallel data bit 8 |
| Broche 18 | DB9 — Parallel data bit 9 |
| Broche 19 | DB10 — Parallel data bit 10 |
| Broche 20 | DB11 — Parallel data bit 11 |
| Broche 21 | DB12 — Parallel data bit 12 |
| Broche 22 | DB13 — Parallel data bit 13 |
| Broche 23 | DB14 — Parallel data bit 14 |
| Broche 24 | DB15 — Parallel data bit 15 (MSB) |
| Broche 25 | CS — Chip select (active low) |
| Broche 26 | RD — Read strobe (active low) |
| Broche 27 | CLK — External clock input / serial clock |
| Broche 28 | VDD — +5 V analog/digital supply |
Applications typiques
ADS7825UE4 convient pour 6 applications: Multi-Channel Industrial Process Control, Portable Data-Logging Systems, Medical Instrumentation Signal Acquisition, Automated Test Equipment (ATE) Front-Ends, Precision Data-Acquisition Boards (PC/104, PXI, USB DAQ), Industrial PLC Analog Input Modules.
Multi-Channel Industrial Process Control
The ADS7825UE4 fits industrial process-control front-ends because its four-channel input multiplexer accepts true bipolar +/-10 V signals directly from PLC analog outputs and 4-20 mA loop sense resistors, eliminating external level-shifting signal conditioning. With 16-bit resolution, +/-2.0 LSB max INL, and +/-0.1% channel-to-channel matching, the device delivers the precision required for closed-loop PID control loops monitoring temperature, pressure, and flow simultaneously. Its 25 us acquisition-plus-conversion time sustains 40 kSPS aggregate throughput, which is sufficient for sub-millisecond control updates across four sensors. The on-chip +2.5 V reference and single +5 V supply reduce BOM count and simplify UL/IEC 61010-1 isolation design.
Recommandé
Portable Data-Logging Systems
Battery-powered multi-channel data loggers benefit from the ADS7825UE4's 50 mW max power dissipation and single +5 V supply, which simplifies power-tree design and extends runtime. The integrated 4-channel MUX lets one ADC digitize four thermocouple, RTD, or strain-gauge signals without a second IC, reducing quiescent current draw. At 40 kSPS aggregate, the part is fast enough for vibration and acoustic emission logging but slow enough to operate in duty-cycled burst mode for further power savings. The internal +2.5 V reference eliminates an extra low-power reference IC, freeing budget for the MCU's sleep current. Industrial -40C to +85C operation supports outdoor and vehicular logging deployments.
Recommandé
Medical Instrumentation Signal Acquisition
Medical front-ends for patient monitoring, infusion pumps, and diagnostic analyzers need simultaneous multi-channel digitization of low-amplitude bioelectric and sensor signals. The ADS7825UE4 provides 16-bit resolution and +/-10 V input range, allowing direct connection to amplified ECG, EEG, SpO2, and blood-pressure transducer outputs without additional gain stages. The +/-0.1% channel-to-channel matching ensures that multi-lead measurements remain temporally and gain-aligned across channels. The parallel/serial interface simplifies connection to low-power medical MCUs and DSPs. Designers should add input ESD protection and patient-isolation barriers per IEC 60601-1 in the analog front-end ahead of the ADC.
Recommandé
Automated Test Equipment (ATE) Front-Ends
ATE rack-and-stack instruments use the ADS7825UE4 to digitize multiple DUT stimulus or response signals through a single ADC, reducing instrument cost and calibration complexity. With 25 us per conversion and 16-bit resolution, the part supports sub-100 us per-channel test sequences across four channels. The parallel 8/16-bit interface enables fast host-side data transfer to FPGA or DSP-based test controllers, while the serial mode reduces pin count for compact PXI-style modules. The +/-10 V true bipolar input accepts both positive and negative DUT signals without external inversion. On-chip +2.5 V reference minimizes calibration drift between channels.
Recommandé
Precision Data-Acquisition Boards (PC/104, PXI, USB DAQ)
Off-the-shelf PC-based DAQ cards often use the ADS7825UE4 to provide 4 simultaneous bipolar channels at 16-bit resolution, supporting laboratory-grade measurements of strain, load, force, and temperature. The part's 86 dB typical SNR and laser-trimmed scaling resistors provide the accuracy needed for transducer-based metrology. The internal MUX simplifies analog input stage design and reduces channel-to-channel crosstalk. Designers commonly pair this ADC with instrumentation amplifiers ahead of each input to provide high common-mode rejection and source impedance buffering for the ADC's resistive input divider.
Recommandé
Industrial PLC Analog Input Modules
Modular PLC analog input cards digitize 4-8 channels per slot, and the ADS7825UE4 is well matched to that channel density. Its 28-SOIC package allows dense PCB placement with each ADC handling a quad of +/-10 V channels. The 50 mW max power dissipation simplifies thermal design in sealed IP67 enclosures. Channel-to-channel matching within +/-0.1% ensures uniform scaling across the module's input channels, critical for safety-integrity applications per IEC 61508 SIL-2/3 when used in redundant architectures. Industrial -40C to +85C operation supports unconditioned cabinet installations.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour ADS7825UE4 — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | ADS7825U | ADS7824UB/1KG4 | ADS7824UB | ADS7824PG4 | ADS7822PBG4 |
|---|---|---|---|---|---|---|
| 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-PDIP (N) - through-hole variant | 28-PDIP (N) - through-hole variant |
| Resolution | 16 bits | 16 bits | 12 bits | 12 bits | 12 bits | 12 bits |
| Input Channels | 4 (multiplexed) | 4 (multiplexed) | 4 (multiplexed) | 4 (multiplexed) | 4 (multiplexed) | 1 (single-channel) |
| Sampling Rate | 40 kSPS | 40 kSPS | 40 kSPS | 40 kSPS | 40 kSPS | 75 kSPS |
| Input Voltage Range | +/-10 V (bipolar) | +/-10 V (bipolar) | +/-10 V (bipolar) | +/-10 V (bipolar) | +/-10 V (bipolar) | +/-5 V or +/-10 V |
| Supply Voltage | +5 V single | +5 V single | +5 V single | +5 V single | +5 V single | +5 V single |
| Internal Reference | +2.5 V (on-chip) | +2.5 V (on-chip) | +2.5 V (on-chip) | +2.5 V (on-chip) | +2.5 V (on-chip) | External reference |
| Pin-Compatible Drop-In | Yes (same family) | Yes - identical | Yes - lower resolution | Yes - lower resolution | DIP only - different package | DIP only - different package |
Principaux différenciateurs
- Four-channel input multiplexer integrated (vs ADS7807PBG4 (single-channel 16-bit ADC))
- True bipolar +/-10 V input range on-chip (vs ADS7824UB (12-bit pin-compatible variant))
- Both parallel and serial interface in one part (vs ADS7817UBG4 (serial-only 12-bit ADC))
Notes de conception
The ADS7825UE4 uses on-chip laser-trimmed scaling resistors that present a fixed source impedance to each analog input. Drive each input through a low-output-impedance buffer amplifier (such as a TI OPA227 or OPA2227) capable of settling to 16-bit accuracy within the 25 us acquisition window. Add a 10 nF X7R ceramic bypass capacitor directly at each ADC input pin to absorb charge-injection transients from the internal MUX and to provide instantaneous charge to the internal sample-and-hold capacitor.
Separate the analog and digital ground planes using a single-point connection (star ground) under or near the AGND pin. Keep the parallel data bus (DB0-DB15) traces short and away from the analog input traces. Place the +5 V supply decoupling (10 uF tantalum + 0.1 uF ceramic) within 5 mm of the VDD pin. The internal reference at the REF pin should be bypassed with a 10 uF tantalum in parallel with a 0.1 uF ceramic to minimize reference noise.
Do not exceed the absolute maximum analog input voltage of +/-25 V. Ensure the ADC's logic-low input voltage (VIL) is met by your host MCU - the ADS7825UE4 uses TTL-compatible thresholds, so 3.3 V microcontrollers may need a level shifter. In serial mode, observe the timing diagram carefully: the CLK-to-DOUT propagation delay is specified in the datasheet and may require wait states at high clock rates. In continuous-conversion mode, ensure the host reads data fast enough to avoid FIFO overrun (the part does not have an internal data buffer).
Estimated: At +5 V supply and maximum 40 kSPS continuous sampling, the ADS7825UE4 draws approximately 10 mA average current, yielding 50 mW total power dissipation (matching the datasheet maximum). For battery-powered designs, use the duty-cycled conversion mode to reduce average supply current proportionally to the sampling duty cycle. Add a ferrite bead in series with the VDD pin to isolate digital switching noise on the +5 V rail from the analog reference ladder.
At 50 mW maximum dissipation in the 28-SOIC package (theta_JA approximately 75 C/W for a standard JEDEC test board), the junction temperature rise is approximately 3.8C above ambient - well within the 125C absolute maximum. No external heatsink is required. For very dense PCBs (>3 ADCs per square inch), verify thermal rise with a prototype, especially in sealed enclosures with limited airflow.
Informations de conformité
ADS7825UE4 is the lead-free (Pb-free) and RoHS-compliant assembly version of the ADS7825. Per the UE4 ordering code suffix, this part meets RoHS and lead-free requirements. Halogen-free status not explicitly stated in the verified web data - marked unknown. Not AEC-Q100 qualified; the part is targeted at industrial (-40C to +85C) rather than automotive Grade 1/0 environments.
