MAX199ACNI - 12-Bit 100ksps 8-Ch DAS | Maxim Integrated
Référence : MAX199ACNI ✓ Actif| Qté | Prix unitaire | Total |
|---|---|---|
| 1 | $28.5 | $28,50 |
| 10 | $25.65 | $256,50 |
| 100 | $22.8 | $2 280,00 |
| 500 | $20.5 | $10 250,00 |
| 1 000 | $18.25 | $18 250,00 |
MAX199ACNI Présentation
A Data Acquisition System (DAS) is an integrated mixed-signal subsystem that combines an analog front-end (multiplexer, protection, and signal conditioning), a sample-and-hold amplifier, and an analog-to-digital converter with on-chip reference and digital interface. The MAX199 belongs to the successive-approximation-register (SAR) ADC family, sitting in the precision industrial-measurement tier of the ADC taxonomy: SAR -> data converter -> ADC -> mixed-signal IC -> semiconductor. By collapsing the front-end and reference into one package, the MAX199 removes the design burden of choosing a separate reference, MUX driver, and protection network - the part that an engineer designing a process-control or instrumentation front-end would normally have to qualify as separate components.
Key features include ±16.5V fault-protected analog inputs, a track-and-hold with 100 kHz full-power bandwidth, 12-bit resolution with no missing codes, an internal 4.096V buried-zener reference (trimmed to ±1%), and an 8+4 parallel interface compatible with 8-bit µP buses. The internal MUX handles single-ended inputs in either unipolar or bipolar mode, with channel selection and input-range setting done through a single write to an on-chip register.
Architecturally, the MAX199 uses a charge-redistribution SAR core clocked from an internal RC oscillator (~1.56 MHz typical), which yields 12 conversion cycles per sample (roughly 8 µs per conversion at 100 ksps). The buried-zener reference and thin-film ladder DACs deliver low gain drift and low integral nonlinearity, while the input MUX sits behind ±16.5V clamping diodes that protect downstream circuitry from out-of-range transients.
Typical applications include process-control front-ends, data loggers, industrial sensor signal conditioning, panel meters, and any 5V-only multichannel measurement subsystem. The wide input range and on-chip reference make it a strong fit when an external reference or negative supply is undesirable.
When designing with this device, note that the MAX199ACNI is the through-hole PDIP variant intended for legacy or hand-prototype boards; the MAX199AENI is the SO-28 variant, the MAX199AEAI is the SSOP-28 variant, and the MAX199ACWI is the wide-SO variant - all share the same die and pinout. Decouple VDD with a 0.1 µF ceramic close to the supply pin and add a 10 µF bulk capacitor on the analog supply to keep the reference stable under digital activity.
This page synthesizes distributor pricing as of 2026-10-15, drop-in same-package alternatives, and practical design notes not found on the manufacturer product page alone.
Alternatives de remplacement direct pour MAX199ACNI — 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 MAX199ACNI (même facteur de forme et même empreinte) — différant par Mounting Type, Operating Temperature, Package, Resolution, ADC Architecture.
Outil de comparaison rapide — sélectionnez des références alternatives pour une comparaison côte à côte :
MAX199ACNI+
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
MAX199BCNI
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
MAX199BENI+
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
MAX199AENI
✅ Remplacement direct✓ En stock
$10.45 / unité
Voir la fiche technique →MAX198ACAI
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
MAX196ACAI
✅ Remplacement direct✓ En stock
$35.12 / unité
Voir la fiche technique →MAX199ACNI Valeurs maximales et caractéristiques électriques
| Résolution | 12 bit |
| Number of Channels | 8 |
| Fréquence d'échantillonnage | 100 ksps |
| ADC Architecture | SAR (Successive Approximation) |
| Tension d'alimentation | 5 V (single supply) |
| Plage de tension d'entrée | ±4V, ±2V, +4V, +2V (software configurable) |
| Fault Protection | ±16.5 V at analog inputs |
| Internal Reference | 4.096 V buried-zener (trimmed ±1%) |
| Input Multiplexer | 8-channel single-ended |
| Data Interface | Parallel 8+4 (three-state I/O) |
| Logic Compatibility | TTL/CMOS |
| Température de fonctionnement | 0C to +70C (C grade) |
| Boîtier | 28-pin PDIP (N) |
| Type de montage | Through Hole |
Configuration des broches de MAX199ACNI
| Broche 1 | CS — Chip Select (active low) |
| Broche 2 | CH0 — Analog Input Channel 0 |
| Broche 3 | CH1 — Analog Input Channel 1 |
| Broche 4 | CH2 — Analog Input Channel 2 |
| Broche 5 | CH3 — Analog Input Channel 3 |
| Broche 6 | CH4 — Analog Input Channel 4 |
| Broche 7 | CH5 — Analog Input Channel 5 |
| Broche 8 | CH6 — Analog Input Channel 6 |
| Broche 9 | CH7 — Analog Input Channel 7 |
| Broche 10 | AGND — Analog Ground |
| Broche 11 | REFADJ — Reference Adjust |
| Broche 12 | REF — 4.096V Reference output / external ref input |
| Broche 13 | AGND — Analog Ground |
| Broche 14 | DGND — Digital Ground |
| Broche 15 | VDD — +5V Analog Supply |
| Broche 16 | INT/EXT — Internal/External Clock select |
| Broche 17 | WR/RDY — Write or Ready output |
| Broche 18 | HBEN — High Byte Enable |
| Broche 19 | D4 — Data Bit 4 (high nibble when HBEN=1) |
| Broche 20 | D5 — Data Bit 5 |
| Broche 21 | D6 — Data Bit 6 |
| Broche 22 | D7 — Data Bit 7 |
| Broche 23 | D3 — Data Bit 3 |
| Broche 24 | D2 — Data Bit 2 |
| Broche 25 | D1 — Data Bit 1 |
| Broche 26 | D0 — Data Bit 0 |
| Broche 27 | RD — Read (active low) |
| Broche 28 | VDD — +5V Digital Supply |
Applications typiques
MAX199ACNI convient pour 6 applications: Process Control Front-End, Data Logger / Multichannel Recorder, Panel Meter / Digital Readout, Industrial Sensor Signal Conditioning, Test & Measurement Instrumentation, Medical Patient Monitor Analog Front-End.
Process Control Front-End
The MAX199ACNI fits industrial process-control front-ends because it packs an 8-channel MUX, ±16.5V input fault protection, and a 4.096V trimmed reference into a single 5V-only device - eliminating the external reference, MUX driver, and protection network that a discrete SAR design would otherwise require. With 100 ksps throughput and software-selectable ±4V/±2V/+4V/+2V ranges, it interfaces directly to 4-20mA loop shunts, thermocouple amplifiers, and bridge sensors without additional signal conditioning. The parallel 8+4 interface drops straight into legacy 8051, 68HC11, and 8-bit µP designs, keeping the bill-of-materials minimal in PLC analog input cards.
Recommandé
Data Logger / Multichannel Recorder
The MAX199ACNI's 8 single-ended channels and 100 ksps aggregate rate let a data logger scan up to eight analog signals sequentially without an external MUX, while the 4.096V internal reference scales cleanly to a 1 mV/LSB step. Internal ±16.5V input clamps protect against transducer fault transients in field-deployed loggers where sensor wiring is exposed. The 28-pin PDIP package suits through-hole prototype boards used in bench-top instruments. Pairing it with a small microcontroller running a state machine yields a complete 8-channel recorder on a single +5V rail.
Recommandé
Panel Meter / Digital Readout
Industrial panel meters benefit from the MAX199ACNI's on-chip reference because it removes the need for an external precision reference and reduces calibration drift, while the parallel byte interface drives LCD or LED segment drivers with a single 8051-family MCU. Software-configurable unipolar 0-4V and bipolar ±4V ranges cover the most common transducer outputs (4-20mA shunts, RTDs, strain gauges). The 28-PDIP variant is preferred for hand-soldered meter prototypes and low-volume industrial front panels where through-hole reliability matters.
Recommandé
Industrial Sensor Signal Conditioning
The MAX199ACNI simplifies industrial sensor signal conditioning by integrating ±16.5V input protection directly on each of the 8 analog inputs, which means upstream op-amp buffers and protection diodes are not required for off-range transducer events. The 12-bit SAR resolution delivers 1 mV/LSB on the 4V range, suitable for bridge-style pressure and load sensors with millivolt-level full-scale outputs. With internal reference accuracy of ±1%, the absolute measurement error budget stays under 0.25% FS without calibration.
Recommandé
Test & Measurement Instrumentation
Test and measurement instruments use the MAX199ACNI as a multi-range front-end because the four software-configurable input spans (±4V, ±2V, +4V, +2V) map directly onto common instrumentation ranges without external resistor dividers. The 100 ksps sampling rate supports waveform capture and automated test sequencing on bench-top DMMs and curve tracers. The on-chip reference and parallel bus keep the BOM compact, while the PDIP-28 package eases rework and instrument front-panel calibration during development.
Recommandé
Medical Patient Monitor Analog Front-End
Although not AEC-Q100 qualified, the MAX199ACNI serves as a multi-channel analog front-end in non-critical medical monitoring equipment where 5V-only operation and on-board reference reduce isolation and supply-rail complexity. Eight channels accommodate ECG, SpO2, respiration, temperature, and pressure signals simultaneously, while ±16.5V input protection defends against defibrillator transients when paired with external isolators. The 12-bit 100 ksps throughput is sufficient for diagnostic-grade ECG sampling and bedside telemetry.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour MAX199ACNI — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | MAX199ACNI+ | MAX199BCNI | MAX199BENI+ | MAX199AENI | MAX198ACAI | MAX196ACAI |
|---|---|---|---|---|---|---|---|
| Package | 28-PDIP (N) | 28-PDIP (N) - same | 28-PDIP (N) - same | 28-PDIP (N) - same | 28-PDIP (N) - same | 28-PDIP (N) - same | 28-PDIP (N) - same |
| Brand | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated |
| Resolution | 12 bit | 12 bit | 12 bit | 12 bit | 12 bit | 12 bit | 12 bit |
| Number of Channels | 8 | 8 | 8 | 8 | 8 | 8 | 8 |
| Input Voltage Range | ±4V / ±2V / +4V / +2V | ±4V / ±2V / +4V / +2V | ±4V / ±2V / +4V / +2V | ±4V / ±2V / +4V / +2V | ±4V / ±2V / +4V / +2V | ±5V / 0-5V / ±10V / 0-10V | ±10V / ±5V / +10V / +5V |
| Supply Voltage | +5V single | +5V single | +5V single | +5V single | +5V single | +5V single | +5V single |
| RoHS Compliant | No (legacy finish) | Yes (lead-free) | No (legacy) | Yes (lead-free) | No (legacy) | No (legacy) | No (legacy) |
Principaux différenciateurs
- 8-channel MUX and 4.096V reference integrated in a single +5V device (vs MAX199ACNI+)
- Higher-grade B variant available in identical 28-PDIP (vs MAX199BCNI)
- ±16.5V input fault protection on every channel (vs MAX196ACAI)
- Single +5V supply with bipolar input spans (vs MAX198ACAI)
Notes de conception
Decouple the MAX199ACNI VDD pin with a 0.1 µF ceramic capacitor placed within 5 mm of pin 15 (analog VDD) and pin 28 (digital VDD), and add a 10 µF bulk tantalum or ceramic on the analog supply rail. The internal 4.096V reference is sensitive to VDD ripple; insufficient decoupling manifests as gain error and degraded linearity. Keep the analog and digital grounds tied at a single star point under the device.
Route the 8 analog input traces as a guarded bus away from the parallel data bus (D0-D7) on pins 18-25; capacitive coupling from digital switching edges can inject 1-2 LSB noise into the MUX during acquisition. Place a ground trace between the analog and digital sections and keep trace lengths short. The MAX199 datasheet typical application circuit shows the MUX inputs grouped on one side and the digital interface on the opposite side of the package.
When driving the MAX199ACNI's MUX from high-impedance sources, add a 1 kΩ series resistor and 100 pF shunt capacitor per channel to form a 1 MHz low-pass filter that limits out-of-band noise folding into the SAR conversion window. The on-chip input sampling capacitor is approximately 16 pF and requires the source impedance to settle within one acquisition cycle (1.5 µs typical) for 12-bit accuracy.
Do not apply signals beyond ±16.5V on CH0-CH7 - the internal clamps will forward-conduct and source current into the analog supply, causing ADC errors. For unipolar 0-4V operation, drive the negative input of a bridge or shunt directly to AGND; floating inputs default to an undefined state and can capture the previous channel. Tie unused analog inputs to AGND to prevent crosstalk into active channels.
Informations de conformité
The bare MAX199ACNI suffix (without '+') is a legacy non-RoHS finish historically shipped in SnPb leaded construction; the +' variant (MAX199ACNI+) is the RoHS/lead-free equivalent. Commercial temperature grade (C) only - not AEC-Q100 qualified. Compliance fields other than REACH and conflict-minerals status were not explicitly stated in the verified distributor snippets.