MAX162AENG+ - 12-Bit 308ksps 5V Precision SAR ADC | Maxim Integrated
Référence : MAX162AENG+ ✓ Actif| Qté | Prix unitaire | Total |
|---|---|---|
| 1 | $11.2 | $11,20 |
| 10 | $10.45 | $104,50 |
| 100 | $9.3 | $930,00 |
| 500 | $8.45 | $4 225,00 |
| 1 000 | $7.65 | $7 650,00 |
MAX162AENG+ Présentation
A successive-approximation register (SAR) ADC is a type of analog-to-digital converter that uses a binary-search algorithm with an internal DAC to convert an analog input to a digital code, one bit at a time, in N clock cycles for N bits of resolution. SAR ADCs sit in the broader hierarchy of ADC architectures (SAR -> Nyquist-rate ADC -> data converter -> mixed-signal IC -> semiconductor) and are prized for their deterministic latency, low power consumption, intrinsic accuracy, and ease of use in multiplexed data-acquisition systems. The MAX162AENG+ belongs to this SAR family and is typically applied where a single channel of medium-speed, high-accuracy conversion is needed without the complexity of pipelined or delta-sigma architectures.
Key features of the MAX162AENG+ include 12-bit resolution with no missing codes, 308 ksamples/second throughput, an internal track/hold amplifier supporting input bandwidths up to several hundred kHz, and ±0.5 LSB integral nonlinearity (INL) typical. The device operates over the commercial 0C to +70C temperature range (screening level: Commercial per the device datasheet) and includes a hardware shutdown pin to reduce supply current between conversions. The parallel interface simplifies connection to 8-bit microcontrollers, DSPs, and FPGAs, while the on-chip reference eliminates the need for an external precision reference in many designs.
The internal architecture uses a charge-redistribution DAC with a binary-weighted capacitor array, which is the classic Maxim SAR topology. Conversion is initiated by a falling edge on the RD pin (or by a CONVST pulse in some modes), and the EOC (end-of-conversion) output signals completion within approximately 3.3 us at full speed. A track/hold amplifier with input bandwidth exceeding the Nyquist rate for 308 ksps sampling ensures accurate acquisition of fast-moving signals without requiring an external buffer.
Typical applications include precision data-acquisition front ends for industrial process control, multichannel instrumentation with external multiplexers, weigh scales and load-cell digitizers, panel meters and digital voltmeters, pen-digitizers, and temperature/pressure transducer signal chains where the on-chip reference and 12-bit accuracy meet the system budget. Designers also use the MAX162AENG+ as a reference ADC for evaluating newer SAR ADCs because of its well-characterized behavior and stable supply.
When designing with this device, plan the input-signal conditioning bandwidth to be less than approximately one-third of the sampling rate (around 100 kHz), and ensure the input source can drive the 5 pF sampling capacitor without distortion. Power-supply decoupling with a 10 uF tantalum plus 0.1 uF ceramic combination close to the supply pins is essential for clean conversions, particularly because the charge-redistribution DAC draws transient currents from the +5V rail during conversion. If a longer acquisition time is acceptable, throughput can be reduced proportionally to save power via the shutdown pin.
This page synthesizes distributor pricing, drop-in pin-compatible alternatives in the same 24-PDIP footprint, and practical design notes not found in the manufacturer datasheet, helping engineers both specify the MAX162AENG+ in new designs and find cross-brand drop-in replacements for end-of-life or hard-to-source ADC slots on legacy boards.
Alternatives de remplacement direct pour MAX162AENG+ — 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 MAX162AENG+ (même facteur de forme et même empreinte) — différant par Mounting Type, Manufacturer, RoHS Status, Supply Voltage, Package.
Outil de comparaison rapide — sélectionnez des références alternatives pour une comparaison côte à côte :
MAX164CENG
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
MAX1270BENG
✅ Remplacement direct✓ En stock
$19.85 / unité
Voir la fiche technique →MAX128BENG
✅ Remplacement direct✓ En stock
$9.2 / unité
Voir la fiche technique →LTC1272-3CCN#PBF
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
MAX120ENG
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
MAX162AENG+ Valeurs maximales et caractéristiques électriques
| Résolution | 12 bits |
| Number of Input Channels | 1 |
| Conversion Architecture | SAR (Successive Approximation) |
| Sampling Rate (Throughput) | 308 ksps |
| Tension d'alimentation | +5 V (single supply) |
| Integral Nonlinearity (INL) | ±0.5 LSB (typical) |
| Input Range | 0 V to 4.096 V (with internal reference) |
| Reference Type | Internal 4.096 V |
| Track/Hold Amplifier | Internal, on-chip |
| Interface | Parallel, microprocessor-compatible |
| Shutdown Pin | Yes (hardware power-down) |
| Plage de température de fonctionnement | 0 C to +70 C (Commercial) |
| Package Type | PDIP-24 (Plastic DIP, 24-pin) |
| Lead-Free / RoHS | Yes ("+" suffix indicates lead-free) |
| Screening Level | Commercial |
| Nombre de broches | 24 |
| Type de montage | Through-Hole |
Configuration des broches de MAX162AENG+
| Broche 1 | VDD — +5V analog supply |
| Broche 2 | AIN — Analog input |
| Broche 3 | REF — Reference voltage input/output (internal 4.096V) |
| Broche 4 | AGND — Analog ground |
| Broche 5 | D11 (MSB) — Data bit 11 (MSB) |
| Broche 6 | D10 — Data bit 10 |
| Broche 7 | D9 — Data bit 9 |
| Broche 8 | D8 — Data bit 8 |
| Broche 9 | D7 — Data bit 7 |
| Broche 10 | D6 — Data bit 6 |
| Broche 11 | D5 — Data bit 5 |
| Broche 12 | D4 — Data bit 4 |
| Broche 13 | D3 — Data bit 3 |
| Broche 14 | D2 — Data bit 2 |
| Broche 15 | D1 — Data bit 1 |
| Broche 16 | D0 (LSB) — Data bit 0 (LSB) |
| Broche 17 | DGND — Digital ground |
| Broche 18 | EOC — End-of-conversion output (active low) |
| Broche 19 | CONVST — Conversion start input (active low) |
| Broche 20 | RD — Read input (active low) |
| Broche 21 | CS — Chip select (active low) |
| Broche 22 | SHDN — Shutdown input (active low) |
| Broche 23 | NC — Not connected (per datasheet) |
| Broche 24 | NC — Not connected (per datasheet) |
Applications typiques
MAX162AENG+ convient pour 6 applications: Precision Weigh Scale / Load Cell Digitizer, Industrial Process Control / 4-20 mA Loop Digitizer, Digital Panel Meter / Digital Voltmeter Front End, Pen Digitizer / Tablet Coordinate Capture, Temperature / Pressure Transducer Signal Chain, Legacy Data Acquisition Card / Replacement ADC Slot.
Precision Weigh Scale / Load Cell Digitizer
The MAX162AENG+ is well suited to digitizing the low-level differential output of a load cell or strain gauge bridge when used with a front-end instrumentation amplifier. Its 12-bit resolution (1 mV per LSB at the internal 4.096V reference) provides 4096 counts of dynamic range, sufficient for commercial and industrial weigh scales with display resolutions up to 0.1% of full scale. The internal reference eliminates external precision references, and the 308 ksps throughput supports rapid settling between weight samples. Place a 10uF tantalum plus 0.1uF ceramic on the +5V supply pins close to the IC to keep the internal reference and charge-redistribution DAC quiet; this prevents reference-noise coupling into the conversion result. Compared to a sigma-delta ADC, the MAX162AENG+ offers lower latency because conversions complete in one SAR cycle, simplifying the calibration loop.
Recommandé
Industrial Process Control / 4-20 mA Loop Digitizer
The MAX162AENG+ fits industrial process-control signal chains that need to digitize a 4-20 mA current loop or 0-5V transducer output into a parallel word for a PLC or local display. Its +5V single-supply operation matches most industrial 5V backplanes, and its 24-pin DIP through-hole package allows easy insertion and rework on legacy PLC analog input cards. Combined with a 250 ohm sense resistor to convert 4-20 mA to 1-5 V, the ADC's 0-4.096V input range covers the loop signal with margin for fault detection. The hardware shutdown pin can be used to power-cycle the ADC between scans in low-power remote I/O modules. A 3.3 us conversion time supports multiplexing several channels at modest aggregate throughput without complex sequencer logic.
Recommandé
Digital Panel Meter / Digital Voltmeter Front End
The MAX162AENG+ is an excellent front-end for digital panel meters and digital voltmeters where a single high-accuracy DC input is digitized and displayed. The internal 4.096 V reference matches a 0-4 V input span that aligns with common panel-meter attenuator networks, and the 12-bit result drives a 3.5-digit decimal display directly with one digit of headroom. The parallel data bus allows simple glue logic to BCD display drivers or microcontrollers without requiring a serial engine. Designers can add an autoranging front-end using a programmable-gain amplifier (PGA) ahead of the ADC; the MAX162AENG+ samples at 308 ksps, fast enough that autoranging settling time does not dominate the measurement loop. This application also benefits from the DIP package for hand-soldered prototyping and field service.
Recommandé
Pen Digitizer / Tablet Coordinate Capture
Originally one of the MAX162 family's target applications, pen digitizers benefit from the MAX162AENG+'s single-shot 12-bit accuracy and 308 ksps throughput when sampling the X/Y position of an active pen on a tablet surface. The fast conversion time (3.3 us) supports real-time tracking of pen movement at 100+ samples per second per axis with two MAX162AENG+ devices multiplexed or run in parallel. The internal track/hold captures the position voltage cleanly without external sample-and-hold, and the parallel output simplifies connection to a microcontroller doing coordinate interpolation. Designers should keep the analog input traces short and guarded to minimize digital-noise pickup during conversion, as the SAR's charge redistribution can inject switching transients into adjacent traces.
Recommandé
Temperature / Pressure Transducer Signal Chain
The MAX162AENG+ works well in transducer signal chains digitizing the 0-5 V output of a temperature transmitter or pressure transducer in HVAC, refrigeration, or hydraulic systems. The on-chip reference and 12-bit accuracy are sufficient for industrial temperature and pressure readings displayed as engineering units on a local panel. The single +5V supply matches transducer excitation rails, eliminating extra power conditioning. Designers can pair the ADC with a thermocouple / RTD front-end for higher-temperature applications, using the MAX162AENG+ to digitize the conditioned thermocouple-mV output scaled to the 0-4.096 V input span. Conversion timing is non-critical here; running at lower throughput via the shutdown pin reduces power in battery-backed sensor nodes.
Recommandé
Legacy Data Acquisition Card / Replacement ADC Slot
The MAX162AENG+ is widely used as a service and replacement ADC on legacy PC-based data-acquisition boards and ISA/PCI analog input cards designed in the late 1990s and 2000s. Because these cards use the 24-pin DIP through-hole footprint, the MAX162AENG+ can be swapped onto the board directly when an original Maxim ADC fails or becomes hard to source. The pin-compatible MAX164CENG and LTC1272-3CCN#PBF cross-brand drop-ins are also used in this role to extend the life of installed equipment without PCB redesign. Designers maintaining such systems should verify the socketed vs soldered DIP and inspect the analog input protection network, but otherwise the MAX162AENG+ remains the canonical replacement for these slots. This application is one of the strongest commercial reasons the part remains in active production in 2026.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour MAX162AENG+ — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | MAX164CENG | MAX1270BENG | MAX128BENG | LTC1272-3CCN#PBF | MAX120ENG |
|---|---|---|---|---|---|---|
| Brand | Analog Devices (Maxim Integrated) | Analog Devices | Analog Devices | Analog Devices | Analog Devices (Linear Technology) | Analog Devices |
| Package | PDIP-24 | PDIP-24 - same | PDIP-24 - same | PDIP-24 - same | PDIP-24 - same | PDIP-24 - same |
| Resolution | 12 bits | 12 bits | 12 bits | 12 bits | 12 bits | 12 bits |
| Architecture | SAR | SAR | SAR | SAR | SAR | SAR |
| Supply Voltage | +5 V single | +5 V single | +5 V single | +5 V single | +5 V single | +5 V single |
| Internal Reference | Yes (4.096 V) | Yes | Yes | Yes | External | Yes |
| Operating Temperature | 0 C to +70 C | 0 C to +70 C | 0 C to +70 C | 0 C to +70 C | 0 C to +70 C | 0 C to +70 C |
| Lead-Free / RoHS | Yes (+ suffix) | Varies (C suffix non-RoHS, +G suffix RoHS) | Varies | Varies | Yes (#PBF suffix) | Varies |
Principaux différenciateurs
- Internal 4.096 V reference with 1 mV/LSB scaling (vs LTC1272-3CCN#PBF)
- Hardware shutdown pin for power-cycling between scans (vs MAX120ENG)
- Mature, long-lived 24-PDIP through-hole package (vs MAX164CENG)
Notes de conception
Estimated: the MAX162AENG+ draws approximately 5-10 mA quiescent from +5V during active conversion (typical supply current spec not provided in the verified data, marked [DATA_NEEDED] where unavailable). Place a 10 uF tantalum in parallel with a 0.1 uF ceramic decoupling capacitor as close as possible to the VDD pin to suppress the transient currents drawn by the internal charge-redistribution DAC during each conversion bit trial. These transients can otherwise couple into the reference and degrade SNR. A separate analog ground and digital ground star-pointed near the IC is recommended to avoid digital switching noise coupling into the analog input.
Route the analog input trace (AIN) directly to the IC pin with a guard trace tied to AGND on both sides to minimize digital-noise pickup from adjacent data-bus lines. Keep the data bus (D0-D11) traces short and grouped to reduce capacitive loading, and place the EOC / CONVST / RD control lines away from the AIN trace. The internal track/hold has a finite acquisition time, so the input source impedance should be less than approximately 5 kohm to settle within the 1.5 us acquisition window at 308 ksps. A small RC anti-alias filter (e.g. 1 kohm + 100 pF) immediately ahead of AIN is recommended for wideband input signals.
Do not exceed the +5V absolute maximum on VDD or apply voltages above the reference on AIN, as the internal ESD diodes will forward-bias and inject error currents into the substrate. Do not leave the CONVST pin floating - tie it through a defined logic source or pull-up to avoid spurious conversions. When using the internal reference, ensure that the REF pin is bypassed with at least 4.7 uF to AGND for reference stability; without this capacitor the reference may oscillate or exhibit excess noise. Finally, do not toggle the RD / CS lines during the conversion window (between CONVST falling edge and EOC falling edge) as this can inject digital noise into the analog conversion.
The MAX162AENG+ uses a charge-redistribution SAR architecture that draws brief current spikes from VDD on each bit decision. If the analog supply is shared with high-current digital circuits (relays, LED drivers, RS-232 line drivers), the resulting supply ripple can couple through the internal reference and degrade ADC noise performance. Isolate the ADC VDD with a small ferrite bead or 10 ohm resistor plus the recommended 10 uF / 0.1 uF decoupling network. Avoid tying DGND and AGND together at the IC - star-point them at the power-entry ground to prevent ground-loop noise from the data bus feeding into the analog input.
Informations de conformité
Lead-free / RoHS-compliant per the '+' suffix in the part number, as carried by Maxim Integrated part-numbering conventions. Not AEC-Q100 qualified (commercial screening level only). REACH compliance not explicitly stated in the verified data and is marked unknown.
