MAX191BCNG - 12-Bit 100kSPS Sampling ADC, 24-PDIP | Maxim Integrated
Référence : MAX191BCNG ✗ Fin de vie| Qté | Prix unitaire | Total |
|---|---|---|
| 1 | $19.75 | $19,75 |
| 10 | $17.5 | $175,00 |
| 100 | $14.2 | $1 420,00 |
| 500 | $12.8 | $6 400,00 |
| 1 000 | $11.5 | $11 500,00 |
MAX191BCNG Présentation
An ADC (analog-to-digital converter) is a data converter that transforms continuous analog voltages into discrete digital codes for processing by microcontrollers, DSPs, or FPGAs. Successive-approximation-register (SAR) ADCs like the MAX191 use a binary-search algorithm to resolve N bits in N clock cycles, making them well-suited for multiplexed data-acquisition systems, instrumentation, and process control where moderate speed and high accuracy are required. Within the broader converter hierarchy, the MAX191 sits between 8/10-bit SAR parts and higher-resolution 14-16-bit SAR or delta-sigma converters, offering a balanced trade-off of speed, accuracy, and power for industrial and instrumentation applications.
Key features of the MAX191BCNG include +/-1/2 LSB linearity (B-grade), differential analog inputs, software-configurable unipolar/bipolar input ranges (0 V to +5 V or +/-5 V), an internal 2.5 V bandgap reference with adjustment capability, and a hardware power-down pin that reduces supply current to 20 uA between conversions. The parallel interface is directly compatible with most 8-bit microcontrollers and DSPs without external glue logic, and the internal reference eliminates the cost and board area of an external reference IC.
Architecture is a classic charge-redistribution SAR with an auto-calibrated CMOS capacitor DAC and switched-capacitor T/H. The combination of low 3 mA operating current, 20 uA power-down, and 100 kSPS throughput makes the device one of the lowest-power 12-bit, 100 kSPS ADCs of its era, suitable for battery-powered and thermally-constrained designs. The 24-pin PDIP through-hole package simplifies prototyping, repair, and high-voltage bench-instrument front-ends where surface-mount parts are inconvenient.
Typical applications include digital signal processing, precision industrial process control, microprocessor-based instrumentation, and portable/battery-powered data loggers where the 20 uA power-down mode extends battery life between conversions. Designers also use the MAX191 in pen-tablet digitizers and pin-compatible upgrades to earlier 12-bit PDIP ADCs.
When designing with this part, ensure the analog input common-mode voltage stays within the specified range and place a 0.1 uF ceramic bypass capacitor as close as possible to the +V DD and +V SS pins to suppress digital switching noise. The internal reference should be decoupled with 4.7 uF tantalum plus 0.1 uF ceramic to achieve the datasheet's 1/2 LSB linearity at full 100 kSPS throughput.
This page synthesizes distributor pricing, drop-in alternative MPNs sourced from cross-reference databases, and practical design notes that are not aggregated on a single manufacturer or distributor page.
Alternatives de remplacement direct pour MAX191BCNG — 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 MAX191BCNG (même facteur de forme et même empreinte) — différant par Operating Temperature, Package, Supply Voltage, Architecture, Resolution.
Outil de comparaison rapide — sélectionnez des références alternatives pour une comparaison côte à côte :
MAX191BCNG+
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
MAX191BENG
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
MAX191BENG+
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
MAX191ACNG+
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
MAX191AENG
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
MAX1271AENG
✅ Remplacement direct✓ En stock
$7.95 / unité
Voir la fiche technique →MAX191BCNG Valeurs maximales et caractéristiques électriques
| Résolution | 12 bit |
| Sample Rate | 100 kSPS |
| Number of Channels | 1 |
| Architecture | SAR (Successive Approximation) |
| Input Type | Differential |
| Conversion Time | 7.5 us |
| Acquisition Time | 2 us |
| Tension d'alimentation | +5 V or +/-5 V |
| Operating Supply Current | 3 mA (typ) |
| Power-Down Current | 20 uA (typ) |
| Linearity (DNL/INL) | +/-1/2 LSB (B-grade) |
| Plage de tension d'entrée | 0 V to +5 V or +/-5 V |
| Internal Reference | 2.5 V bandgap, adjustable |
| Digital Interface | Parallel (uP-compatible) |
| Boîtier | 24-PDIP (N) through-hole |
| Nombre de broches | 24 |
| Température de fonctionnement | 0C to +70C (commercial) |
Configuration des broches de MAX191BCNG
| Broche 1 | VSS — Negative supply / analog ground (for +/-5 V operation) or analog ground (for +5 V operation) |
| Broche 2 | AIN+ — Positive analog input |
| Broche 3 | AIN- — Negative analog input (differential) |
| Broche 4 | REF — Reference voltage output / input (internal 2.5 V nominal) |
| Broche 5 | REFADJ — Reference adjust input for external trimming |
| Broche 6 | VDD — Positive supply (+5 V) |
| Broche 7 | MODE — Mode select (unipolar / bipolar input range) |
| Broche 8 | PD — Power-down input (active low, 20 uA in power-down) |
| Broche 9 | CONVST — Conversion start input |
| Broche 10 | CS — Chip select input (active low) |
| Broche 11 | RD — Read input (active low) |
| Broche 12 | BUSY — Busy output (active low during conversion) |
| Broche 13 | HBEN — High-byte enable input |
| Broche 14 | D11 — Data output bit 11 (MSB) |
| Broche 15 | D10 — Data output bit 10 |
| Broche 16 | D9 — Data output bit 9 |
| Broche 17 | D8 — Data output bit 8 |
| Broche 18 | D7 — Data output bit 7 |
| Broche 19 | D6 — Data output bit 6 |
| Broche 20 | D5 — Data output bit 5 |
| Broche 21 | D4 — Data output bit 4 |
| Broche 22 | D3 — Data output bit 3 |
| Broche 23 | D2/D0 — Data output bit 2 (or bit 0 in low-byte mode) |
| Broche 24 | D1 — Data output bit 1 |
Applications typiques
MAX191BCNG convient pour 6 applications: Digital Signal Processing Front-End, Industrial Process Control, Microprocessor-Based Instrumentation, Battery-Powered Data Loggers, Pen-Tablet Digitizers, Legacy 12-bit ADC Repair and Replacement.
Digital Signal Processing Front-End
The MAX191BCNG's 100 kSPS throughput and 12-bit resolution make it a well-matched front-end for DSP-based instrumentation that processes audio-bandwidth or vibration signals. With a 7.5 us conversion time and 2 us acquisition time the part comfortably samples at 4x oversampling for audio-band anti-aliasing. The parallel uP-compatible interface feeds DSP data buses directly without glue logic, and the internal 2.5 V reference eliminates an external reference IC, reducing BOM cost in production DSP designs. The 3 mA operating current is acceptable for line-powered signal processing equipment, and the differential inputs reject common-mode noise from industrial sensor cables. For battery-powered DSP portable instruments the 20 uA power-down mode lets the converter idle between triggered acquisitions.
Recommandé
Industrial Process Control
The MAX191BCNG is widely used in industrial process-control systems where +/-5 V or 0-5 V analog signals from transducers (pressure, flow, temperature) must be digitized for PLC or SCADA monitoring. Its differential inputs reject common-mode ground noise common in long cable runs across factory floors, and the +/-1/2 LSB B-grade linearity preserves calibration accuracy. The 24-PDIP through-hole package withstands the conformal coating and vibration of industrial enclosures better than surface-mount parts, and the 0-70C commercial temperature range covers most factory-floor installations. The 100 kSPS throughput supports multiplexed multi-channel scanning of slow process variables. The internal 2.5 V reference with adjustment capability lets designers trim gain error in calibration routines without an external trimpot.
Recommandé
Microprocessor-Based Instrumentation
The MAX191BCNG is designed specifically for direct connection to 8-bit microprocessor or microcontroller data buses. The CS, RD, and INT outputs map cleanly to standard memory-mapped I/O ports, allowing the ADC to be read with a single MOVX or similar instruction. The 100 kSPS throughput supports digital oscilloscope front-ends, digital multimeters, and bench-top data-acquisition systems. The internal reference and track/hold reduce external component count to just bypass capacitors and the input signal-conditioning op-amp, simplifying layout. The 24-PDIP package is preferred for prototype instrumentation where through-hole parts are easier to swap during development.
Recommandé
Battery-Powered Data Loggers
The MAX191BCNG's 20 uA power-down current is the key spec for battery-powered data loggers where the ADC is idle between triggered acquisitions. The 3 mA operating current only flows during the 7.5 us conversion + 2 us acquisition window, giving an average current of well under 100 uA at a 1 sample-per-second rate. This makes the part suitable for handheld environmental monitors, remote sensor telemetry, and field-portable vibration loggers powered from 9 V batteries or solar cells. The differential inputs allow direct connection to bridge-type sensors without an instrumentation front-end. The internal reference eliminates the quiescent current of an external reference IC, and the 24-PDIP package handles mechanical stress of portable use.
Recommandé
Pen-Tablet Digitizers
The MAX191BCNG was originally designed into pen-tablet digitizer products where its 100 kSPS sample rate captures stylus position data fast enough for natural handwriting recognition. The differential inputs connect directly to the digitizer's wire-grid sensor with common-mode noise rejection for the analog front-end. The 12-bit resolution gives 4096 quantization levels across the tablet active area, sufficient for handwriting stroke fidelity. The internal reference and parallel uP interface kept the BOM cost low enough for the consumer pen-tablet market of the era, and the 24-PDIP package simplified the through-hole assembly lines of the period. The 20 uA power-down mode extended battery life of cordless tablets.
Recommandé
Legacy 12-bit ADC Repair and Replacement
The MAX191BCNG is widely used as a direct replacement part in legacy repair of older industrial, medical, and test equipment originally built around Maxim's MAX191 family. Service technicians keep stock of the MAX191BCNG and its lead-free MAX191BCNG+ variant because the 24-PDIP through-hole package is field-replaceable with standard soldering tools. The pin-compatible MAX191BENG and MAX191AENG variants allow technicians to swap in B-grade or A-grade parts depending on whether the original used +/-1/2 LSB or +/-1 LSB linearity. For equipment where the MAX191 is no longer available, the manufacturer-recommended migration target is the MAX129x family, which offers improved specifications with similar package options.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour MAX191BCNG — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | MAX191BCNG+ | MAX191BENG | MAX191BENG+ | MAX191ACNG+ | MAX191AENG |
|---|---|---|---|---|---|---|
| Package | 24-PDIP (N) | 24-PDIP (N) - same | 24-PDIP (N) - same | 24-PDIP (N) - same | 24-PDIP (N) - same | 24-PDIP (N) - same |
| Brand | Maxim Integrated (Analog Devices) | Maxim Integrated (Analog Devices) | Maxim Integrated (Analog Devices) | Maxim Integrated (Analog Devices) | Maxim Integrated (Analog Devices) | Maxim Integrated (Analog Devices) |
| Resolution | 12 bit | 12 bit | 12 bit | 12 bit | 12 bit | 12 bit |
| Sample Rate | 100 kSPS | 100 kSPS | 100 kSPS | 100 kSPS | 100 kSPS | 100 kSPS |
| Linearity Grade | B-grade (+/-1/2 LSB) | B-grade (+/-1/2 LSB) | B-grade (+/-1/2 LSB) | B-grade (+/-1/2 LSB) | A-grade (+/-1 LSB) | A-grade (+/-1 LSB) |
| Lead Finish | Standard lead (SnPb) | Lead-free (RoHS) | Standard lead (SnPb) | Lead-free (RoHS) | Lead-free (RoHS) | Standard lead (SnPb) |
| Lifecycle Status | Obsolete | Obsolete | Obsolete | Obsolete | Obsolete | Obsolete |
Principaux différenciateurs
- Industry-standard 24-PDIP through-hole package (vs MAX1271AENG)
- Parallel uP-compatible interface eliminates glue logic (vs MAX1271AENG)
- Internal 2.5 V reference with adjustment capability (vs MAX191BENG (B-grade, no internal reference adjustment))
Notes de conception
The MAX191BCNG draws 3 mA from the +5 V supply during active conversion and drops to 20 uA in power-down mode. Bypass the VDD pin with a 0.1 uF ceramic capacitor placed within 5 mm of the pin, and add a 10 uF tantalum bulk capacitor for the digital supply current transients during parallel data-bus switching. For +/-5 V operation, also bypass VSS with 0.1 uF ceramic. The 20 uA power-down current assumes the PD pin is held low between conversions; tie PD high (or to VDD) via a 100 kohm pull-up if software power-down is not used.
The 24-PDIP package should be socketed or hand-soldered on prototype boards to allow swap-out of B-grade vs A-grade parts. Keep analog input traces (AIN+, AIN-) short and guarded with ground traces to minimize common-mode noise pickup. Place the reference decoupling capacitors (4.7 uF tantalum + 0.1 uF ceramic) directly at the REF pin. Route the parallel digital data bus (D0-D11) away from the analog input traces to avoid digital switching noise coupling into the analog front-end; if unavoidable, use a ground trace between analog and digital sections.
Do not exceed the absolute maximum analog input voltage of VDD + 0.3 V or go below VSS - 0.3 V, or the input ESD cells will forward-bias and corrupt the conversion. The internal reference must be decoupled or the linearity spec will degrade at full 100 kSPS throughput. The CONVST pin requires a clean falling edge to start conversion; if using a microprocessor GPIO, ensure the pin is configured as a push-pull output with fast slew rate. Finally, observe the BUSY high-to-low transition before reading data; reading before BUSY goes low returns stale data from the previous conversion.
For best differential-input performance, source the analog signal from a low-impedance driver (op-amp output stage) with the common-mode voltage centered within the AIN+/AIN- input common-mode range. Add a 100 ohm series resistor at each analog input pin to dampen ADC chargekickback transients from the internal T/H switch. If using long input cable runs, add an RC anti-aliasing filter (typically 1 kohm + 470 pF for 100 kSPS Nyquist) before the ADC inputs to reject out-of-band noise that would otherwise alias into the conversion result.
Informations de conformité
The MAX191BCNG (without '+' suffix) is the standard lead-finish (SnPb) version and is RoHS non-compliant per the Maxim suffix convention. Choose the MAX191BCNG+ (with '+') for lead-free RoHS-compliant assembly. AEC-Q100 not applicable - this is a commercial-grade 0-70C ADC, not automotive-qualified. REACH, halogen-free, and conflict-minerals status not stated in the available data.
