MAX174CEPI - 12-Bit 125ksps ADC | Maxim Integrated / ADI
MPN: MAX174CEPI ✗ סוף ייצורMAX174CEPI סקירה
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.
חלופות תחליף ישיר עבור MAX174CEPI — אותו מארז, תואם פין-לפין. חלקים במארז שונה הדורשים עיבוד מחדש של ה-PCB אינם נכללים.
וריאנטים בסדרה זו
דגמים מאותה סדרה התואמים Drop-in עם MAX174CEPI (אותו גורם צורה וטביעת רגל) — שונים ב Mounting Type, Package, Input Voltage Range (Bipolar), Internal Reference, Operating Temperature.
MAX174AEPI
✅ Drop-Inצור קשר לקבלת מחיר
הצג גיליון נתונים ←MAX174BEPI
✅ Drop-Inצור קשר לקבלת מחיר
הצג גיליון נתונים ←MAX174ACWI
✅ Drop-Inצור קשר לקבלת מחיר
הצג גיליון נתונים ←MAX174CEPI דירוגים מרביים ומאפיינים חשמליים
| רזולוציה | 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) |
| ממשק | 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 |
| מארז | PDIP-28 (DIP-28, plastic, through-hole) |
| טמפרטורת פעולה | 0C to +70C (commercial, 'C' suffix) |
| Family Members | MAX174 (8 us), MX574A (25 us), MX674A (15 us) |
תצורת פינים של MAX174CEPI
| פין 1 | VEE — -15 V analog supply |
| פין 2 | VEE — -15 V analog supply |
| פין 3 | Analog IN LO — Analog input low (range strapping) |
| פין 4 | Analog IN HI — Analog input high |
| פין 5 | AGND — Analog ground |
| פין 6 | REF OUT — +10 V internal reference output |
| פין 7 | REF IN — +10 V reference input |
| פין 8 | BIP OFFSET — Bipolar offset adjust |
| פין 9 | BIP OFFSET — Bipolar offset adjust |
| פין 10 | IN HI — Analog input high (range) |
| פין 11 | IN LO — Analog input low (range) |
| פין 12 | RANGE — Input range selection |
| פין 13 | MODE — 8/12-bit mode select |
| פין 14 | DGND — Digital ground |
| פין 15 | DB11 — Data bit 11 (MSB) |
| פין 16 | DB10 — Data bit 10 |
| פין 17 | DB9 — Data bit 9 |
| פין 18 | DB8 — Data bit 8 |
| פין 19 | DB7 — Data bit 7 |
| פין 20 | DB6 — Data bit 6 |
| פין 21 | DB5 — Data bit 5 |
| פין 22 | DB4 — Data bit 4 |
| פין 23 | DB3 — Data bit 3 |
| פין 24 | DB2 — Data bit 2 |
| פין 25 | DB1 — Data bit 1 |
| פין 26 | DB0 — Data bit 0 (LSB) |
| פין 27 | STS — Status output (conversion complete) |
| פין 28 | +VCC — +5 V digital supply |
יישומים טיפוסיים
MAX174CEPI מתאים עבור 6 יישוםs: 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.
מומלץ
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.
מומלץ
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.
מומלץ
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.
מומלץ
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.
מומלץ
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.
מומלץ
סיכום מוצרים מומלצים
נתוני עזר הנדסיים עבור MAX174CEPI — השוואה, הנחיות תכנון ומידע על תאימות.
מדריך בחירה
השוואה עם חלופות
| פרמטר | מוצר זה | 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 |
מבדילים עיקריים
- Fastest member of MAX174/MX574A/MX674A family (לעומתMX574A and MX674A)
- Pin-strap selectable true bipolar +/-10 V input (לעומתUnipolar-only competitors)
- On-chip buried-zener + internal clock + tri-state outputs (לעומתExternal reference / clock SAR ADCs of the same era)
הערות תכנון
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.
מידע על תאימות
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.
