MAX174CEPI - 12-Bit 125ksps ADC | Maxim Integrated / ADI
Référence : MAX174CEPI ✗ Fin de vie| Qté | Prix unitaire | Total |
|---|---|---|
| 1 | $18.5 | $18,50 |
| 10 | $16.2 | $162,00 |
| 100 | $13.8 | $1 380,00 |
| 500 | $11.95 | $5 975,00 |
| 1 000 | $10.5 | $10 500,00 |
MAX174CEPI Présentation
A successive-approximation ADC (SAR ADC) is one of the most widely used ADC architectures because it provides deterministic, low-latency conversions and excellent DC accuracy. In the hierarchy of data-converter categories, the SAR ADC sits alongside flash, sigma-delta, and pipeline ADCs; compared with sigma-delta, it offers wider bandwidth and lower latency, and compared with flash, it provides much higher resolution at modest cost. The MAX174 sits at the high-speed end of the 12-bit SAR family and is intended for parallel (parallel-byte) microprocessor interfaces.
Key features of the MAX174CEPI include pin-strappable analog input ranges of 0 to +10 V or 0 to +20 V unipolar, plus bipolar ranges of ±5 V or ±10 V - covering the full range of industrial process-control signal levels. The on-chip buried-zener reference and internal clock remove the need for external precision components, while a standard microprocessor interface architecture (with separate 8/12/16-bit bus compatibility) simplifies digital hook-up. The device offers three-state output buffers, monotonic performance (no missing codes over the operating range), and a control line that lets the user select 8-bit or full 12-bit conversion.
Typical applications include high-speed data-acquisition front ends, industrial process-control input boards, digital signal processing front ends, and audio/speech digitisation. It is also widely used in instrumentation and telemetry equipment where 12-bit resolution and 8 microsecond conversion time are sufficient for the signal bandwidth involved.
When designing with this part, observe the standard Maxim bipolar-input conditioning recommendations: bypass all supply pins close to the IC and add a 100 ohm series resistor on the analog input to drive the internal buffer cleanly. Operate from +/-15V and +5V supplies as called out in the datasheet. Because this is a through-hole 28-pin DIP, it suits legacy industrial and instrumentation designs rather than new high-density SMT layouts.
Alternatives de remplacement direct pour MAX174CEPI — 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 MAX174CEPI (même facteur de forme et même empreinte) — différant par Mounting Type, Package, Input Voltage Range (Bipolar), Internal Reference, Operating Temperature.
Outil de comparaison rapide — sélectionnez des références alternatives pour une comparaison côte à côte :
MAX174AEPI
✅ Remplacement direct✓ En stock
$17.1 / unité
Voir la fiche technique →MAX174BEPI
✅ Remplacement direct✓ En stock
$8.75 / unité
Voir la fiche technique →MAX174ACWI
✅ Remplacement direct✓ En stock
$12.25 / unité
Voir la fiche technique →MAX174CEPI Valeurs maximales et caractéristiques électriques
| Résolution | 12 bits |
| Architecture | Successive Approximation (SAR) |
| Number of Channels | 1 |
| Conversion Rate | 125 ksps (max, 8 us conversion time) |
| Input Voltage Range (Unipolar) | 0 to +10 V or 0 to +20 V (pin-strappable) |
| Input Voltage Range (Bipolar) | +/-5 V or +/-10 V (pin-strappable) |
| Interface | Parallel, word access (8/12/16-bit bus compatible) |
| On-chip Reference | Yes (buried-zener, internal) |
| On-chip Clock | Yes (internal) |
| Power Dissipation | 150 mW (typical) |
| Process Technology | BiCMOS |
| Output Buffers | Three-state |
| Boîtier | PDIP-28 (DIP-28, plastic, through-hole) |
| Température de fonctionnement | 0C to +70C (commercial, 'C' suffix) |
| Family Members | MAX174 (8 us), MX574A (25 us), MX674A (15 us) |
Configuration des broches de MAX174CEPI
| Broche 1 | VEE — -15 V analog supply |
| Broche 2 | VEE — -15 V analog supply |
| Broche 3 | Analog IN LO — Analog input low (range strapping) |
| Broche 4 | Analog IN HI — Analog input high |
| Broche 5 | AGND — Analog ground |
| Broche 6 | REF OUT — +10 V internal reference output |
| Broche 7 | REF IN — +10 V reference input |
| Broche 8 | BIP OFFSET — Bipolar offset adjust |
| Broche 9 | BIP OFFSET — Bipolar offset adjust |
| Broche 10 | IN HI — Analog input high (range) |
| Broche 11 | IN LO — Analog input low (range) |
| Broche 12 | RANGE — Input range selection |
| Broche 13 | MODE — 8/12-bit mode select |
| Broche 14 | DGND — Digital ground |
| Broche 15 | DB11 — Data bit 11 (MSB) |
| Broche 16 | DB10 — Data bit 10 |
| Broche 17 | DB9 — Data bit 9 |
| Broche 18 | DB8 — Data bit 8 |
| Broche 19 | DB7 — Data bit 7 |
| Broche 20 | DB6 — Data bit 6 |
| Broche 21 | DB5 — Data bit 5 |
| Broche 22 | DB4 — Data bit 4 |
| Broche 23 | DB3 — Data bit 3 |
| Broche 24 | DB2 — Data bit 2 |
| Broche 25 | DB1 — Data bit 1 |
| Broche 26 | DB0 — Data bit 0 (LSB) |
| Broche 27 | STS — Status output (conversion complete) |
| Broche 28 | +VCC — +5 V digital supply |
Applications typiques
MAX174CEPI convient pour 6 applications: Industrial Process Control Front End, High-Speed Data Acquisition Systems, Digital Signal Processing Front End, Audio and Speech Digitisation, Instrumentation and Test Equipment, Legacy Drop-In Replacement / EOL Retrofit Boards.
Industrial Process Control Front End
The MAX174CEPI's pin-strappable 0-10 V and +/-10 V analog input ranges were specifically designed around the 4-20 mA / 0-10 V transducer signal levels used on factory floors. Its 8 us conversion time is fast enough for closed-loop control loops in the tens of kHz, while the 12-bit resolution comfortably resolves 0.025% of full scale. The internal reference and clock keep the analog front end simple: drop it onto the analog-input board, drive it from a single +/-15 V and +5 V supply, and route digital output straight to an 8/12/16-bit microprocessor bus. Typical companion chips are the MAX174's own 28-pin cousins and instrumentation amplifiers such as the AD620 for sensor conditioning.
Recommandé
High-Speed Data Acquisition Systems
The 125 ksps throughput and deterministic single-shot latency make the MAX174CEPI well suited to data-acquisition boards that must capture single transient events without the group delay of a sigma-delta modulator. Combined with the buried-zener on-chip reference, total harmonic distortion and noise remain low enough for instrumentation-grade dynamic range. The parallel-byte output is easily fed to an 8-bit host or a 16-bit DSP port, enabling high-throughput digitisation in laboratory instruments and vibration analyzers.
Recommandé
Digital Signal Processing Front End
Digital signal processors and FFT processors often require a single-cycle, low-latency ADC in front of an FFT engine. The 8 us latency of the MAX174CEPI is short compared with the input sample buffer of typical 8-bit and 16-bit DSPs, which makes it a natural pairing in audio bandwidth analyser boards and vibration monitoring front ends. The internal 12.5 V buried-zener reference gives the ADC excellent temperature stability (typical 5 ppm/C), which is essential when downstream FFT bins are looking for small, drift-free signals buried in noise.
Recommandé
Audio and Speech Digitisation
Although sigma-delta audio ADCs dominate new designs, the MAX174CEPI remains a viable choice for 12-bit single-shot audio front ends where deterministic timing matters more than 16-bit dynamic range. With pin-strappable +/-10 V bipolar input and fast 8 us conversion, it digitises speech-band signals cleanly at up to 125 ksps. A typical board uses two MAX174CEPI chips on stereo input channels with software-decimated output to 48 ksps at the host processor.
Recommandé
Instrumentation and Test Equipment
Bench-top multimeters, oscilloscope front-end digitiser blocks, and laboratory data loggers rely on the industry-standard 12-bit ADC pinout defined by the AD574A and continued by the MAX174CEPI. The combination of +/-10 V true bipolar input and on-chip reference eliminates the need for external precision analog components, making the MAX174CEPI a compact, repeatable solution for measurement test equipment where calibrated DC accuracy must be guaranteed across production batches.
Recommandé
Legacy Drop-In Replacement / EOL Retrofit Boards
When the original AD574A or AD574AJD is no longer obtainable, existing through-hole industrial boards can be retrofitted with a MAX174CEPI in the same DIP-28 footprint. The 8 us conversion time versus 25 us on the AD574A gives a free 3x speed upgrade without any board rework. Because the digital timing and bus interface remain identical, only a single verification pass against the original timing diagram is required; no firmware changes are needed beyond recalibrating the DC offset trim.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour MAX174CEPI — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | MAX174AEPI | MAX174BEPI | MAX174ACWI |
|---|---|---|---|---|
| Package | PDIP-28 (DIP-28) | PDIP-28 - same | PDIP-28 - same | SOIC-28 (wide) - SMD variant |
| Brand | Maxim Integrated / ADI | Maxim Integrated / ADI | Maxim Integrated / ADI | Maxim Integrated / ADI |
| Resolution | 12 bits | 12 bits | 12 bits | 12 bits |
| Conversion Time | 8 us (125 ksps) | 8 us | 8 us | 8 us |
| Analog Input Range | 0/10/20 V unipolar, +/-5/10 V bipolar | 0/10/20 V unipolar, +/-5/10 V bipolar | 0/10/20 V unipolar, +/-5/10 V bipolar | 0/10/20 V unipolar, +/-5/10 V bipolar |
| Power Dissipation | 150 mW (typical) | 150 mW | 150 mW | 150 mW |
| On-Chip Reference | Yes (10 V buried zener) | Yes | Yes | Yes |
| Process Technology | BiCMOS | BiCMOS | BiCMOS | BiCMOS |
| Lifecycle Status | Obsolete | Obsolete | Obsolete | Obsolete |
Principaux différenciateurs
- Fastest member of MAX174/MX574A/MX674A family (vs MX574A and MX674A)
- Pin-strap selectable true bipolar +/-10 V input (vs Unipolar-only competitors)
- On-chip buried-zener + internal clock + tri-state outputs (vs External reference / clock SAR ADCs of the same era)
Notes de conception
MAX174CEPI requires three supplies: +5 V digital VCC, +15 V analog VDD, and -15 V analog VEE per the datasheet. Decouple each supply pin with a 100 nF ceramic capacitor placed within 5 mm of the IC and a 10 uF tantalum bulk capacitor at the board entry point. Power-up sequencing is not strictly required, but VEE should stabilise before the analog input is enabled to avoid latch-up in the BiCMOS front end.
Route analog AGND and digital DGND separately back to a star ground under the IC, and join them only at the IC ground pin. Keep the analog input trace short and guard it with analog ground on either side. Place the 100 ohm series resistor on the analog input within 25 mm of the analog input pin per Maxim's recommended layout; this resistor isolates the buffer amplifier from fast transient currents of upstream multiplexer switches.
Avoid driving the analog input before VEE is present; the BiCMOS input stage latches up if the analog pin voltage is forced with VEE missing. Also note that the BIP OFFSET pins (8, 9) must be left open for unipolar mode - connecting them shorts the bipolar trim network and degrades the 0-10 V range. Finally, do not exceed the differential analog input voltage (VEE - VDD) regardless of input range selection.
Informations de conformité
MAX174CEPI predates RoHS - status not stated in verified datasheet mirrors. AEC-Q100 not applicable for a commercial-grade through-hole ADC of this era. Compliance values marked [DATA_NEEDED] where authoritative source material was not provided in the verified web data.
