MAX198BEWI - 12-Bit 100kSPS Multirange DAS | Maxim Integrated
MPN: MAX198BEWI ✗ Akhir HidupMAX198BEWI Ringkasan
A Data Acquisition System (DAS) is an integrated mixed-signal IC that combines a multi-channel analog input multiplexer, sample-and-hold amplifier, analog-to-digital converter, voltage reference, digital control logic, and parallel bus interface in a single package. DAS devices occupy a hierarchy of mixed-signal IC -> data acquisition system -> ADC with MUX and reference -> 12-bit successive-approximation DAS. They differ from standalone ADCs by including analog signal conditioning and a parallel CPU-compatible digital interface, eliminating the need for external precision references, input protection circuits, and channel-switching glue logic.
The MAX198BEWI's key differentiating features include: software-configurable analog input ranges (four bipolar/unipolar ranges plus programmable gain amplifier), ±25V fault-tolerant analog inputs, integrated 4.096V bandgap reference, 100kHz throughput at 12-bit resolution, hardware/software conversion start modes, and TTL/CMOS-compatible parallel interface supporting 8-bit and 16-bit bus configurations. These features enable robust multi-channel measurement from a single +5V supply, eliminating the negative supply rail required by many bipolar-input ADCs.
Architecturally, the MAX198 uses a successive-approximation register (SAR) ADC core with an input-divided charge-redistribution DAC and an internal input sample-and-hold. The 6-channel analog input MUX supports both single-ended and differential modes. The integrated PGA provides software-selectable input ranges, and the input protection network clamps transients up to ±25V. An internal 4.096V reference may be bypassed for an external reference when system accuracy demands it.
Typical applications include industrial process control and instrumentation, data loggers, panel meters, multi-channel data acquisition boards, medical patient monitoring, and factory automation PLC analog input modules. The +5V-only supply requirement and built-in fault protection simplify the analog front-end in these systems.
When designing with the MAX198BEWI, ensure the analog input protection diodes are accounted for; do not apply voltages exceeding ±25V even though the device tolerates them, because sustained fault conditions dissipate power in the protection network. Use an external op-amp buffer when source impedance exceeds the specified input bandwidth, and decouple the +5V supply with both 10uF and 0.1uF capacitors placed close to the AVDD pin.
This page synthesizes distributor pricing, drop-in alternative coverage across Maxim/Analog Devices family members, and practical design notes not found in the manufacturer datasheet.
Alternatif penggantian untuk MAX198BEWI — paket yang sama, pin-pada-pin kompatibel. Bagian paket yang berbeda memerlukan kerja ulang PCB diabaikan.
Variasi di dalam seri ini
Model-series yang sama yang kompatibel dengan penggantian MAX198BEWI (sama faktor bentuk dan footprint) — berbeda di dalam Sampling Rate, Number of Channels, Operating Temperature, Package, Resolution.
MAX198BEWI+
✅ Drop-In📋 Alternatif referensi (tidak dalam katalog)
MAX198AEWI
✅ Drop-In📋 Alternatif referensi (tidak dalam katalog)
MAX198AEWI+
✅ Drop-In📋 Alternatif referensi (tidak dalam katalog)
MAX196BEWI
✅ Drop-In📋 Alternatif referensi (tidak dalam katalog)
MAX196BCWI
✅ Drop-In📋 Alternatif referensi (tidak dalam katalog)
MAX198BEWI Rating Maksimal & Karakteristik Listrik
| Architecture | SAR (Successive Approximation) Data Acquisition System |
| Resolusi | 12 bits |
| Number of Channels | 6 analog input channels (single-ended or differential) |
| Laju Pengambilan Sampel | 100 kSPS |
| Tegangan Pemuat | +5 V single supply |
| Rentang Tegangan Masukan | 0 to 5V, 0 to 10V, ±5V, ±4V (software-selectable); ±10V/±20V with external resistor dividers |
| Fault-Protected Input Range | ±25 V (without damage) |
| Analog Input Type | Single-ended or differential, multiplexed |
| Internal Reference | 4.096 V (bandgap, bypass optional) |
| Digital Interface | Parallel, 8-bit or 16-bit bus compatible, TTL/CMOS |
| Lebar Bus Data | 12-bit (configurable for 8-bit / 16-bit data buses) |
| Paket | 28-SOIC (Wide SO, 7.50 mm width) |
| Suhu Kerja | -40 C to +85 C (Industrial grade; 'B' suffix) |
| Tipe Mounting | Surface Mount |
| Status RoHS | Not compliant (original Maxim product) |
Konfigurasi Pin MAX198BEWI
| Pin produk 1 | AIN0 — Analog input channel 0 |
| Pin produk 2 | AIN1 — Analog input channel 1 |
| Pin produk 3 | AIN2 — Analog input channel 2 |
| Pin produk 4 | AIN3 — Analog input channel 3 |
| Pin produk 5 | AIN4 — Analog input channel 4 |
| Pin produk 6 | AIN5 — Analog input channel 5 |
| Pin produk 7 | REF — Reference output / input (4.096V nominal) |
| Pin produk 8 | AGND — Analog ground |
| Pin produk 9 | AVDD — +5V analog supply |
| Pin produk 10 | DVDD — +5V digital supply |
| Pin produk 11 | DGND — Digital ground |
| Pin produk 12 | CS — Chip select (active low) |
| Pin produk 13 | RD — Read strobe (active low) |
| Pin produk 14 | WR — Write strobe (active low) |
| Pin produk 15 | MODE — Mode select / conversion control |
| Pin produk 16 | D11 — Data bit 11 (MSB) |
| Pin produk 17 | D10 — Data bit 10 |
| Pin produk 18 | D9 — Data bit 9 |
| Pin produk 19 | D8 — Data bit 8 |
| Pin produk 20 | D7 — Data bit 7 |
| Pin produk 21 | D6 — Data bit 6 |
| Pin produk 22 | D5 — Data bit 5 |
| Pin produk 23 | D4 — Data bit 4 |
| Pin produk 24 | D3/HBEN — Data bit 3 / High-byte enable |
| Pin produk 25 | D2 — Data bit 2 |
| Pin produk 26 | D1 — Data bit 1 |
| Pin produk 27 | D0 — Data bit 0 (LSB) |
| Pin produk 28 | INT — Interrupt / end-of-conversion output |
Aplikasi Umum
MAX198BEWI cocok untuk 6 aplikasis: Industrial Process Control and PLC Analog Input Modules, Multi-Channel Data Loggers and Panel Meters, Medical Patient Monitoring and Instrumentation, Factory Automation Sensor Signal Conditioning, Test and Measurement Instrumentation, Automotive Sensor and Battery Monitoring Modules.
Industrial Process Control and PLC Analog Input Modules
The MAX198BEWI's 6 multiplexed input channels, 12-bit resolution at 100 kSPS, and ±25 V fault protection make it well suited for industrial process-control analog input modules. In a typical PLC analog front-end, the part accepts signals from 4-20 mA current-loop transducers (sensed across a 250 ohm resistor to yield 1-5 V), thermocouples (after cold-junction compensation and amplification), and ±10 V process variables from valve positioners, all within a single +5 V supply. The integrated PGA eliminates external scaling resistors for the common 0-5 V and ±5 V transducer ranges, and the ±25 V fault protection tolerates mis-wired field wiring during installation. Designers pair the MAX198BEWI with an external 4N25-style digital isolator and a small 8-bit microcontroller for the isolated analog input channel.
Direkomendasikan
Multi-Channel Data Loggers and Panel Meters
The MAX198BEWI's 12-bit resolution, 100 kSPS throughput, and 6 single-ended input channels (or 3 differential channels) suit multi-channel data loggers and digital panel meters measuring temperature, pressure, and flow. A typical 6-channel data logger accepts signals from up to six RTD-conditioned analog inputs, digitizes each at 12-bit resolution every 10 ms (100 SPS per channel at 600 SPS aggregate), and stores the result via an external microcontroller to flash memory. The integrated 4.096 V bandgap reference simplifies the analog supply tree, and the +5 V single-supply operation allows the logger to be powered from a USB port or a small Li-ion battery with a buck-boost regulator. The fault protection ensures the ADC survives field installation wiring errors common in retrofit applications.
Direkomendasikan
Medical Patient Monitoring and Instrumentation
The MAX198BEWI is used in medical instrumentation for multi-channel physiological signal acquisition where the 12-bit resolution and 100 kSPS throughput are sufficient for ECG, SpO2, respiration, and temperature channels. A typical patient monitor front-end digitizes one ECG channel at 500 SPS, one SpO2 photoplethysmogram channel at 100 SPS, and three slower temperature or respiration channels at 10 SPS each, all within the 6-channel capacity. The bipolar ±5 V input range allows direct connection to instrumentation amplifier outputs without offset shifting, and the integrated PGA simplifies the analog signal chain. For higher-resolution ECG (16-bit or 18-bit) the MAX1300-series family is recommended, but for cost-optimized vital-signs monitors the MAX198BEWI remains a viable design choice.
Direkomendasikan
Factory Automation Sensor Signal Conditioning
The MAX198BEWI's integrated PGA, 6-channel MUX, and ±25 V fault tolerance suit factory automation sensor signal-conditioning boards where multiple analog signals (proximity sensors, pressure transducers, position encoders) must be digitized within a single 28-pin SOIC footprint. In a typical sensor-conditioning module, four strain-gauge bridges are sensed via instrumentation amplifiers and routed to four of the MAX198 input channels, while the remaining two channels digitize a motor current shunt and a vibration sensor. The single +5 V supply requirement allows direct operation from the 24 V factory bus via a small isolated DC-DC converter. The bipolar ±4 V range covers most analog sensor outputs without scaling, and the 100 kSPS throughput supports real-time closed-loop control at up to 1 ms loop period.
Direkomendasikan
Test and Measurement Instrumentation
The MAX198BEWI is used in test-and-measurement instruments such as bench multimeters, oscilloscope front-end digitizers, and signal-analyzer input stages where 12-bit resolution at 100 kSPS is sufficient for many measurement tasks. A typical 4-channel bench digitizer uses the MAX198 to sample four input signals at 25 kSPS per channel (100 kSPS aggregate), with the analog inputs scaled to within the ±4 V range via external attenuators. The fault-tolerant ±25 V inputs allow the instrument to survive over-range conditions during operator probing. The integrated reference and PGA minimize external components, allowing a compact bench-top form factor. The TTL/CMOS parallel interface connects directly to the instrument microcontroller bus without level translation.
Direkomendasikan
Automotive Sensor and Battery Monitoring Modules
Although the MAX198BEWI itself is not AEC-Q100 qualified, it is widely used in non-automotive-grade automotive test equipment and aftermarket modules such as battery monitors, OBD-II scan tools, and engine-tuning interfaces. In a 12-channel battery-monitoring module for an EV prototype, two MAX198BEWI parts are cascaded (analog input multiplexers external) to digitize 12 cell voltages at 1 kSPS per channel, with the ±25 V fault protection surviving load-dump transients and reverse-battery events when paired with external TVS diodes. The single +5 V supply operation simplifies the power tree when the module is powered from the 12 V vehicle rail via a small switching regulator. Engineers should validate against AEC-Q100 requirements separately for production designs; for prototype and aftermarket designs the MAX198BEWI is acceptable.
Direkomendasikan
Ringkasan Produk Direkomendasikan
Data referensi engineering untuk MAX198BEWI — pembandingan, panduan desain, dan informasi konformitas.
Panduan Pemilihan
Pembandingan dengan Alternatif
| Parameter Umum | Produk Ini | MAX198BEWI+ | MAX198AEWI | MAX198AEWI+ | MAX198BCAI | MAX196BEWI | MAX196BCWI |
|---|---|---|---|---|---|---|---|
| Brand | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated |
| Package | 28-SOIC (Wide SO) | 28-SOIC (Wide SO) - same | 28-SOIC (Wide SO) - same | 28-SOIC (Wide SO) - same | 28-SSOP - smaller | 28-SOIC (Wide SO) - same | 28-SOIC (Wide SO) - same |
| Resolution | 12 bits | 12 bits - same | 12 bits - same | 12 bits - same | 12 bits - same | 12 bits - same | 12 bits - same |
| Sampling Rate | 100 kSPS | 100 kSPS - same | 100 kSPS - same | 100 kSPS - same | 100 kSPS - same | 100 kSPS - same | 100 kSPS - same |
| Number of Channels | 6 | 6 - same | 6 - same | 6 - same | 6 - same | 6 - same | 6 - same |
| Internal Input Range | ±4 V (with ±10/±20V via ext. resistors) | ±4 V - same | ±4 V - same | ±4 V - same | ±4 V - same | ±10 V (broader) | ±10 V (broader) |
| Fault-Protected Input | ±25 V | ±25 V - same | ±25 V - same | ±25 V - same | ±25 V - same | ±25 V - same | ±25 V - same |
| Temperature Grade | Industrial (-40C to +85C) | Industrial (-40C to +85C) - same | Commercial (0C to +70C) | Commercial (0C to +70C) | Industrial (-40C to +85C) - same | Industrial (-40C to +85C) - same | Commercial (0C to +70C) |
| RoHS Compliance | No (original Maxim product) | Yes (Pb-free '+' suffix) | No (commercial grade) | Yes (Pb-free '+' suffix) | unknown | No (original Maxim product) | unknown |
Diferensiator Kunci
- Single +5 V supply with internal bipolar input range generation (vsMAX198BEWI vs older bipolar ADCs requiring -5V/-12V supplies)
- ±25 V fault-protected analog inputs without external protection (vsMAX198BEWI vs MAX188BEPP (which requires external TVS diodes for fault protection))
- Software-selectable input ranges (4 internal ranges via PGA) (vsMAX198BEWI vs MAX130CQH+TD (fixed-range ADC))
- 6-channel integrated MUX in a single 28-SOIC package (vsMAX198BEWI vs MAX135CWI (8-channel ADC, different architecture))
Catatan Desain
The MAX198BEWI requires a single +5 V supply on both AVDD (pin 9) and DVDD (pin 10). Decouple each supply pin with a 0.1 uF ceramic capacitor placed within 5 mm of the pin, and add a 10 uF tantalum or ceramic bulk capacitor at the supply entry point to the PCB. The internal charge-pump that generates the bipolar input range draws brief current pulses during conversion; the 10 uF bulk capacitor prevents these pulses from modulating the +5 V rail and degrading ADC linearity on adjacent channels. A ferrite bead between the digital and analog +5 V rails is recommended when digital noise is present.
Route the analog input traces (AIN0-AIN5) as differential pairs or as guarded single-ended traces over a continuous analog ground plane on the top PCB layer. Keep analog input traces at least 5 mm away from the digital data bus (D11-D0) and the digital control lines (CS/RD/WR/MODE/INT) to minimize digital-to-analog crosstalk. Place the AGND-DGND connection at a single point near the ADC, not at the power supply entry. The internal 4.096 V reference (pin 7) requires a 4.7 uF bypass capacitor to AGND; do not omit this capacitor as it filters reference noise that directly couples into the ADC conversion result.
Do not apply voltages exceeding ±25 V to the analog inputs even though the device tolerates them - sustained fault conditions dissipate power in the input protection network and may damage the ADC over time. When designing for ±10 V or ±20 V input ranges, use external 1% metal-film resistor dividers on each analog input channel; the internal PGA alone supports ±4 V. Ensure the source impedance of the analog input is below the value specified in the datasheet input-bandwidth table; if not, add an external op-amp buffer to preserve ADC linearity. Do not leave any analog input floating - tie unused channels to AGND via 10 kohm resistors to prevent noise pickup that can corrupt adjacent channel conversions.
Use a four-layer PCB stackup with dedicated analog and digital ground planes to achieve the datasheet's 12-bit no-missing-code performance. Route the +5 V analog and digital supplies on separate inner-layer planes, joining them only at the ADC AVDD/DVDD pins. Place a 10 ohm resistor between the digital +5 V plane and the DVDD pin to isolate switching transients from the digital supply rail. Keep the REF pin (pin 7) bypass capacitor and trace as short as possible - a 1 mm trace adds approximately 1 nH of inductance, which can form a resonant loop with the bypass capacitor and degrade reference stability at high sampling rates.
When sampling at 100 kSPS, the input sample-and-hold requires the analog input to settle to 12-bit accuracy within the acquisition window (approximately 1.5 us). Use op-amp buffers with 1 MHz or higher gain-bandwidth product on high-impedance analog sources to ensure full settling. Add 100 pF anti-aliasing capacitors on each analog input for signals above 50 kHz; these capacitors form an RC low-pass filter with the input MUX resistance. Verify settling by reading the digital output at full-scale and zero-scale transitions and checking that the worst-case settling error stays within 1 LSB (1 mV at 4.096 V reference).
Informasi Konformitas
Original MAX198BEWI is not RoHS compliant per Maxim product marking. Choose MAX198BEWI+ (Pb-free '+' suffix) for RoHS-compliant designs. AEC-Q100 status not qualified - this part is not intended for automotive safety-critical applications.
