MAX134CMH+ - 3.75-Digit 50ms DMM ADC | Maxim Integrated
MPN: MAX134CMH+ ✓ פעילMAX134CMH+ סקירה
A digital multimeter ADC is a specialized interface integrated between an analog measurement circuit and a digital display or processor. In the product hierarchy, the MAX134 is an integrating ADC, which is a type of data-converter IC used to transform a continuously varying input voltage into a digital measurement. Integrating converters are especially useful in panel-meter and instrument designs because they support accurate ratiometric measurements with relatively simple external circuitry.
The MAX134 family combines 3.75-digit measurement resolution with a 50 ms conversion interval. Its ±40,000-count internal scale provides additional numerical headroom for guard-digit operations, while the 4000-count displayed range corresponds to a standard 3.75-digit instrument. The 44-terminal square QFP package also provides more board area than a small-outline package, making it practical for instruments where analog routing and component access are more important than minimum PCB area.
The MAX133 and MAX134 are integrating analog-to-digital converters for 3.75-digit multimeters and data-acquisition systems such as data loggers and weigh scales. The supplied manufacturer material states that the devices differ only in an electrical characteristic that is not fully reproduced in the search excerpt, so engineers should consult the complete MAX134 data sheet before selecting MAX133 or using either device outside the documented measurement architecture.
Typical uses include handheld and bench multimeters, panel meters, process-monitoring instruments, load-cell and weigh-scale interfaces, and low-rate data loggers. These applications benefit from the 50 ms conversion time and guard-digit capability because the converter is intended to deliver stable displayed readings rather than high-speed waveform acquisition.
The main design consideration is board implementation. Because the supplied web data identifies a 44-pin MQFP but does not provide a complete verified pin-by-pin description, designers should use the manufacturer data sheet and its reference circuit rather than infer connectivity from generic QFP libraries. Input filtering, reference selection, display drive support, and analog grounding directly influence measurement repeatability.
This product page combines verified manufacturer and distributor information with application guidance, pricing context, comparison parameters, and package-specific validation notes. It also distinguishes electrically useful alternatives from suffix-only packaging variants to prevent unsafe replacement assumptions.
חלופות תחליף ישיר עבור MAX134CMH+ — אותו מארז, תואם פין-לפין. חלקים במארז שונה הדורשים עיבוד מחדש של ה-PCB אינם נכללים.
MAX134CMH
✅ Drop-In📋 חלופה להתייחסות (לא בקטלוג)
MAX134CMH+D
✅ Drop-In📋 חלופה להתייחסות (לא בקטלוג)
MAX134CMH+ דירוגים מרביים ומאפיינים חשמליים
| ADC Type | Integrating analog-to-digital converter |
| Display Resolution | 3.75 digits |
| Internal Resolution | ±40,000 counts |
| Displayed Reading Range | 4,000 counts |
| Guard Digit Resolution | 1/10 of a displayed count |
| Conversion Time | 50 ms |
| מארז | 44-MQFP (10 mm x 10 mm) |
| Total Terminals | 44 terminals |
| Package Shape | Square |
| Terminal Form | Gull wing |
| Temperature Grade | Commercial |
| סוג הרכבה | Surface mount |
| Product Lifecycle | Production |
| Typical Applications | Digital multimeters, data loggers, weigh scales |
מדריך תצורת פינים של MAX134CMH+ square
תצורת פינים עבור MAX134CMH+ (מארזת square). רכיב אנלוגי זה כולל פיני כניסה, יציאה ואספקת מתח. יש לעיין בגיליון הנתונים של היצרן לתצורות פיני איפוס היסט, פיצוי והפעלה. אידיאלי למעגלי עיצוב אותות ומגברים.
אין נתוני פריסת פינים מפורטים עבור MAX134CMH+.
עיינו ב- גיליון נתונים עבור תצורת פינים מלאה.
יישומים טיפוסיים
MAX134CMH+ מתאים עבור 6 יישוםs: Handheld Digital Multimeter, Digital Panel Meter, Weigh-Scale Display, Industrial Data Logger, Process-Monitoring Instrument, Bench Instrument Measurement Front End.
Handheld Digital Multimeter
The MAX134CMH+ is a natural conversion front end for a 3.75-digit handheld multimeter because it is specifically intended for digital multimeters and converts in 50 ms. Its internal resolution of ±40,000 counts gives the instrument a guard-digit scale while retaining a 4000-count displayed range. That additional numerical headroom can support autozero or tare operations to one tenth of a displayed count, helping the meter preserve resolution when compensating for offset. Designers should follow the manufacturer reference circuit for input protection, reference routing, filtering, and display-interface support because those values are not present in the supplied web excerpts.
מומלץ
Digital Panel Meter
A digital panel meter can use the MAX134CMH+ to turn a slowly changing analog measurement into a stable displayed value. The 50 ms conversion interval is appropriate for continuously updated process readouts rather than high-speed signal capture, while the 3.75-digit format aligns with common panel-meter display conventions. The ±40,000-count internal scale and guard digit allow offset compensation without reducing the nominal 4000-count displayed resolution. Practical implementation should preserve the recommended analog grounding and filtering layout, and the meter designer must verify the exact pin functions from the MAX134 data sheet, Rev. 1, before routing the 10 mm by 10 mm MQFP.
מומלץ
Weigh-Scale Display
The MAX134CMH+ is suitable for the measurement and display stage of a weigh scale because the manufacturer identifies weigh scales as an intended application for the MAX133 and MAX134 integrating ADC family. Its 50 ms conversion time supports responsive updates for a slowly changing load signal, while the 3.75-digit format and ±40,000-count internal scale provide useful guard-digit capacity. This is a measurement-display function rather than a high-speed signal-processing ADC. Load-cell excitation, amplification, filtering, and reference accuracy must be designed separately, and the analog signal path should closely follow the manufacturer layout to prevent drift and noise from degrading the final count.
מומלץ
Industrial Data Logger
A low-rate industrial data logger can use the MAX134CMH+ when each channel requires a stable numeric measurement rather than sampled waveform data. The 50 ms conversion time is useful for periodic logging of temperature, pressure, process voltage, or similar slowly varying quantities, and the integrating-converter architecture is directly associated with data-logger applications in the MAX134 family documentation. The ±40,000-count internal scale and guard digit improve the useful resolution of a 4000-count display. Engineers should budget for input conditioning and channel isolation and verify supply, reference, and pin details against the official data sheet because those parameters are not established by the supplied distributor snippets.
מומלץ
Process-Monitoring Instrument
The MAX134CMH+ fits process-monitoring instruments that repeatedly sample an analog process variable and present a readable value. Its 50 ms conversion time supports periodic readings, while the 3.75-digit representation is appropriate for displays and control interfaces requiring one-tenth-count presentation. The internal ±40,000-count resolution and guard digit can improve the effective observation of a 4000-count reading during autozero or tare compensation. Because this is an integrating measurement converter, the design must give special attention to input settling, reference stability, grounding, and rejection of periodic interference; the exact external network must be taken from the MAX134 data sheet, Rev. 1.
מומלץ
Bench Instrument Measurement Front End
A bench measurement instrument can use the MAX134CMH+ as the dedicated converter behind a slow analog input and digital readout. The 50 ms conversion time suits meters and laboratory panels whose readings change gradually, while the 3.75-digit format and guard-digit capability provide a practical balance between displayed resolution and internal calculation headroom. The 44-terminal MQFP provides ample routing space for analog, reference, digital-interface, and support connections in a larger instrument board. Designers should not infer the pinout from package size alone; they should reproduce the manufacturer's application circuit and verify calibration, reference, and component-selection requirements from the complete MAX134 data sheet, Rev. 1.
מומלץ
סיכום מוצרים מומלצים
נתוני עזר הנדסיים עבור MAX134CMH+ — השוואה, הנחיות תכנון ומידע על תאימות.
מדריך בחירה
השוואה עם חלופות
| פרמטר | מוצר זה | MAX134CMH | MAX134CMH+D |
|---|---|---|---|
| Package | 44-MQFP (10 mm x 10 mm) | 44-MQFP (10 mm x 10 mm) | 44-MQFP (10 mm x 10 mm) |
| Brand | Maxim Integrated | Maxim Integrated | Maxim Integrated |
| ADC Type | Integrating analog-to-digital converter | Integrating analog-to-digital converter | Integrating analog-to-digital converter |
| Display Resolution | 3.75 digits | 3.75 digits | 3.75 digits |
| Internal Resolution | ±40,000 counts | ±40,000 counts | ±40,000 counts |
| Conversion Time | 50 ms | 50 ms | 50 ms |
| Guard Digit | 1/10 of a displayed count | 1/10 of a displayed count | 1/10 of a displayed count |
מבדילים עיקריים
- Purpose-built 3.75-digit instrument conversion (לעומתMAX134CMH)
- Guard-digit capacity for compensated measurements (לעומתMAX134CMH+D)
- Verified 44-terminal package format (לעומתMAX134CMH)
הערות תכנון
Reproduce the manufacturer reference layout before assigning net names to the 44-pin MQFP. The supplied search data confirms the 10 mm by 10 mm package and 44 terminals but does not provide a complete verified pin map. Route the analog measurement input and reference paths away from digital switching nodes, place the recommended input and bypass components close to their associated pins, and use the MAX134 data sheet, Rev. 1, as the controlling source for every connection.
Treat the analog front end as a settling and filtering problem rather than a high-speed signal path. A 50 ms conversion time allows substantial measurement averaging, but the input network still must allow the source to settle before conversion. Use the filter and input components specified by the manufacturer and validate the full measurement chain with the intended source impedance. This avoids adding unnecessary capacitance that could impair accuracy or overload the converter input.
Do not infer the full pinout, reference voltage, supply range, or suffix meaning from distributor category text. MAX134CMH+, MAX134CMH, MAX134CMH+D, and MAX134CMH+TD appear in separate search results, but the supplied excerpts do not explain every suffix distinction. Before procurement, verify the ordering table in the MAX134 data sheet, Rev. 1, confirm the required temperature grade, and compare the complete manufacturer pin description against the intended PCB.
Design the reference and supply paths for measurement stability before adding display-processing circuitry. A 3.75-digit result with a ±40,000-count internal scale can make reference drift appear as meaningful count changes even though the converter conversion time is only 50 ms. Keep high-current return paths away from the analog reference node, follow the recommended bypass and decoupling arrangement, and evaluate temperature drift with the complete measurement chain rather than the ADC alone.
מידע על תאימות
The supplied web data identifies the MAX134 as a production product and describes it as commercial grade, but it does not provide RoHS, REACH, lead-free, halogen-free, or conflict-minerals statements. AEC-Q100 is recorded as not applicable because the target is a commercial-grade measurement IC rather than an automotive-qualified variant.
