MAX135CPI+ - 15-Bit Low-Power ADC | Analog Devices
MPN: MAX135CPI+ ✓ AktifMAX135CPI+ Ringkasan
An ADC is a mixed-signal semiconductor that converts an analog voltage into a digital code for processing, measurement, or control. The MAX135 belongs to the ADC family, and more specifically to the low-power CMOS multi-slope ADC category. Its parallel binary output provides multiple data lines, making the device suitable for systems that need a sampled measurement presented to a digital bus, microcontroller, or dedicated control logic.
Key features include 15-bit binary output, differential analog input, 16-SPS tested operation, operation at up to 6 times the tested rate, and up to 18-bit resolution using Super LSBs with data averaging. The verified manufacturer information also identifies a supply current of 125 µA and a 28-pin PDIP package. These characteristics emphasize low power, low-noise conversion rather than high-speed sampling.
The multi-slope integration architecture is the device’s principal technical feature. According to the Analog Devices product page, it provides low noise and high resolution in less time than standard integrating ADCs. Super LSBs and data averaging extend usable resolution beyond the nominal 15-bit output, although system accuracy still depends on the analog front end, reference source, clock, input filtering, and layout quality. The parallel interface provides a direct digital connection for suitable embedded measurement systems.
Typical uses include industrial process measurement, laboratory instrumentation, low-power sensor acquisition, battery-operated portable equipment, and embedded measurement systems that can accept a parallel ADC output. The MAX135CPI+ is especially relevant where a low conversion rate, low supply current, differential input, and high-resolution averaging are more important than rapid sampling or a compact surface-mount package.
Designers should pay particular attention to analog grounding, input filtering, reference stability, and acquisition timing. The 28-pin PDIP package is through-hole rather than a compact SMD package, so board space and connector availability should be checked before design commitment. Verify the complete electrical limits, pin names, timing requirements, and application circuit directly in the manufacturer datasheet before layout.
This page combines verified distributor catalog information, the official Analog Devices product overview, application-oriented guidance, and an honest drop-in replacement assessment. It is intended to help engineers locate the datasheet, understand the converter’s architecture, compare meaningful variants, and plan a power-conscious parallel-interface measurement design.
Pilihan pengganti yang segera untuk MAX135CPI+ — sama paket, pin-pin kompatibel. Bahagian paket yang berbeza memerlukan kerja ulang PCB diasingkan.
MAX135CPI
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MAX135CPI+ Penilaian maksimum & Ciri-ciri Elektrik
| Product Type | Analog-to-digital converter (ADC) |
| Architecture | Multi-slope integration ADC |
| Nominal Resolution | 15 bits |
| Maximum Stated Resolution | 18 bits using Super LSBs with data averaging |
| Jenis Output | Binary, parallel |
| Input Type | Differential, 1 input |
| Tested Conversion Rate | 16 conversions/s |
| Maximum Operating Rate | Up to 96 conversions/s |
| Arus Pemberi Arus | 125 µA |
| Technology | CMOS |
| Kemasan | 28-pin PDIP |
| Jenis Pemasangan | Through-hole |
| Antaramuka | Parallel interface |
| Input Channel Count | 1 |
| Status RoHS | unknown |
| REACH Status | unknown |
Panduan Konfigurasi Pin MAX135CPI+ 28-pin pdip
Konfigurasi pin untuk MAX135CPI+ (28-pin pdip pakai). Komponen analog ini mempunyai pin masukan, keluaran, dan kuasa. Rujuk dokumen pengeluar untuk konfigurasi pengecualian, pemulihan, dan pin aktifkan. Ideal untuk pengawasan isyarat dan litar pengukur.
Tiada data garisan pin yang diperoleh untuk MAX135CPI+.
Rujuk kepada lembaran data untuk konfigurasi pin penuh.
Aplikasi Biasa
MAX135CPI+ patut untuk 6 aplikasis: Industrial Process Measurement, Precision Sensor Signal Acquisition, Battery-Powered Portable Instrument, Laboratory Data Acquisition, Environmental Monitoring, Control and Instrumentation Interface.
Industrial Process Measurement
The MAX135CPI+ fits slow industrial process-measurement channels that require differential analog input and a parallel digital result. Its 15-bit nominal output, tested 16-conversions/s throughput, and multi-slope integration provide a strong fit for sensors whose useful bandwidth is well below the converter’s maximum operating rate of 96 conversions/s. The differential input is particularly useful when the transducer produces a small signal around a biased common-mode level and requires rejection of coupled noise. A practical implementation places input filtering near the device, uses a stable reference, and routes the parallel outputs to acquisition logic. The 125 µA supply current also helps keep continuously energized measurement channels efficient. Final accuracy depends on sensor excitation, analog conditioning, reference quality, grounding, and calibration, so designers should consult the manufacturer data sheet before fixing production values.
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Precision Sensor Signal Acquisition
The MAX135CPI+ is appropriate for low-frequency precision sensors whose outputs are slow enough for the converter’s multi-slope integration cycle. A differential input simplifies connection to bridge, ratiometric, or current-mode sensors, while Super LSBs with data averaging can improve effective resolution to as many as 18 bits under suitable conditions. The design should include a low-noise reference, protection appropriate to the sensor output, and an input filter that preserves the required response time. Because the nominal output remains a 15-bit binary word, downstream firmware should distinguish the base resolution from averaging-derived effective resolution. The converter’s 125 µA supply current is advantageous in remote or battery-powered instrumentation. Engineers must verify the official voltage limits, timing, and acquisition-control sequence before finalizing the analog and digital interface.
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Battery-Powered Portable Instrument
The MAX135CPI+ supports low-power portable measurement instruments where the ADC must resolve a slowly changing analog quantity without continuously running at high sample rates. The manufacturer lists a 125 µA supply current, and the converter’s tested 16 conversions/s rate is well suited to temperature, pressure, or level readings that change over seconds or minutes. A duty-cycled measurement strategy can activate the converter only when a reading is required, reducing average system consumption. Its differential input and up to 18-bit averaging capability help preserve useful data quality from low-level sensors, although real battery life also depends on the reference, signal-conditioning circuitry, interface pull states, and display load. The 28-pin PDIP footprint consumes more board area than a modern SMD ADC, so it is most attractive where through-hole construction and serviceability matter more than miniaturization.
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Laboratory Data Acquisition
The MAX135CPI+ can serve as the measurement ADC in laboratory equipment that prioritizes resolution, differential input, and deterministic parallel data access over high-speed sampling. Multi-slope integration provides low-noise conversion, and the Super LSB averaging function can raise effective resolution to up to 18 bits for repeatable static measurements. The 15-bit binary output can be captured by a microcontroller or programmable logic device, although the wide parallel bus requires careful routing and setup-time analysis. A stable reference and shielded analog section are essential when seeking repeatable results. The device’s maximum operating rate of 96 conversions/s suits slow measurements but not waveform capture. The 28-pin PDIP package also makes instrument repair and replacement straightforward. Designers should confirm electrical limits and conversion timing in the official data sheet, especially when calibrating gain and offset across multiple ranges.
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Environmental Monitoring
The MAX135CPI+ is well matched to environmental monitoring systems measuring temperature, humidity, pressure, gas concentration, or similar slowly changing sensor outputs. These systems generally require stable readings rather than high-speed sampling, allowing the MAX135’s tested 16 conversions/s rate and multi-slope noise performance to be used effectively. Differential input can reduce sensitivity to common-mode disturbances when the front end is designed around it. Data averaging through Super LSBs may improve apparent resolution and reporting stability, although it extends acquisition time. The converter’s 125 µA supply current supports distributed or low-power deployments, while the parallel interface allows direct connection to edge-processing hardware. In field installations, transient protection, reference drift, grounding, and sensor lead length can dominate measured performance. Engineers should verify temperature-range requirements and use the manufacturer timing and electrical data before deployment.
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Control and Instrumentation Interface
The MAX135CPI+ can serve as the analog measurement front end in a control panel or instrumentation subsystem that requires a deterministic parallel result. Its differential input is useful for conditioning bipolar or small-amplitude signals referenced around a nonzero common-mode voltage, while the multi-slope ADC architecture supports low-noise conversion. A control system can initiate a conversion, latch the 15-bit binary output, and apply calibration or filtering in downstream logic. The 125 µA supply current keeps the converter efficient when multiple channels are used, but external multiplexers, references, and interface devices may dominate total power. The 28-pin PDIP package supports conventional through-hole assembly and maintenance, while also requiring adequate board area. Designers should use the official pin and timing information to define acquisition control, input multiplexing, and fail-safe behavior, and should not infer unavailable specifications from distributor summaries.
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Data referensi kejuruteraan untuk MAX135CPI+ — perbandingan, panduan rancangan, dan maklumat kesediaan
Panduan Pilihan
Perbandingan dengan Gantian
| Parametr | Produk Ini | MAX135CPI |
|---|---|---|
| Product Type | 15-bit low-power multi-slope ADC | 15-bit low-power multi-slope ADC |
| Brand | Analog Devices | Analog Devices |
| Package | 28-pin PDIP | 28-pin PDIP |
| Nominal Resolution | 15 bits | 15 bits |
| Conversion Architecture | Multi-slope integration | Multi-slope integration |
| Tested Conversion Rate | 16 conversions/s | 16 conversions/s |
| Interface | Binary parallel | Binary parallel |
Penyeberangsung Jelas
- Higher effective resolution through averaging (vsMAX135CPI)
- Low-power precision conversion (vsMAX135CPI)
- Differential parallel acquisition (vsMAX135CPI)
Catatan Desain
Route the differential input as a short, balanced pair on the PCB and keep it away from digital output and switching-supply paths. Place input filtering and protection close to the MAX135CPI+ pins, with a low-noise ground return and a quiet analog ground region. The 28-pin PDIP footprint provides ample physical space, but lead inductance and ground currents still require disciplined return paths. Confirm the official package drawing and pin table before assigning schematic symbols or PCB nets.
Treat the parallel output as a timing-sensitive interface. Check output setup and hold requirements against the acquisition device’s clock, add series damping where edges are slow or the bus is long, and avoid unnecessary stubs. The converter’s low conversion rate does not eliminate parallel-bus skew, so register the outputs when required by the system architecture. Use the manufacturer timing diagrams rather than estimating acceptable timing solely from the 16 conversions/s headline rate.
The official product overview lists 125 µA supply current, making the MAX135CPI+ suitable for low-power acquisition. However, total system demand also includes the reference, input conditioning, interface pull states, and downstream logic. Use stable, low-noise supplies and provide local decoupling according to the manufacturer circuit recommendations. If the converter shares a rail with switching circuitry, preserve the reference’s noise performance through filtering and separate return-current paths rather than relying only on bulk capacitance.
Do not equate the advertised 18-bit averaging resolution with a physical 18-bit parallel output: the converter is described as a 15-bit binary-output ADC, with up to 18-bit resolution obtained through Super LSBs and data averaging. Avoid designing firmware or system documentation that claims an 18-bit interface. Also avoid substituting MAX135EPI+ or MAX135EWI+T as drop-in parts until their package and pin compatibility have been confirmed independently; the supplied evidence does not establish that they share the target’s 28-pin PDIP footprint.
Maklumat Kesediaan
The verified excerpts do not provide explicit RoHS, REACH, halogen-free, lead-free, conflict-minerals, or AEC-Q100 statements. AEC-Q100 is marked not applicable because no automotive qualification is identified in the supplied data.