MAX198ACWI - 6-Channel 12-Bit DAS, 5V, 100kSPS | Maxim/ADI
MPN: MAX198ACWI ✓ فعالMAX198ACWI جائزہ
A Data Acquisition System (DAS) such as this combines a multi-channel input multiplexer, a sample-and-hold amplifier, a SAR (Successive Approximation Register) ADC core, voltage reference support, and a digital bus interface into a single IC. The MAX198ACWI sits in the ADC IC family, beneath the broader category of data-conversion / data-acquisition semiconductors, and is used as the analog front-end in distributed control, instrumentation, and embedded systems where multiple analog signals must be digitized and delivered to a host CPU or DSP over a fast parallel port.
Key features include software-configurable unipolar input ranges of 0 V to +VREF (where VREF is the internal 4.096 V bandgap or an external reference) and 0 V to +5 V, 6.0 us conversion time, an internal 4.096 V reference, and AC + DC (±1/2 LSB) linearity over the operating range. Software-configurable bipolar ranges (±VREF, ±5 V on the MAX196, ±10 V on the MAX197) are the user's choice. The three-state bidirectional data port is compatible with 16-bit data buses, and bus-release timing is matched to the read cycles of most 8051-family, 68HC11, and similar microprocessors. All digital I/O are TTL/CMOS compatible, simplifying level translation in mixed-voltage designs.
Architecturally, the device uses a charge-redistribution SAR ADC with an input fault-protected multiplexer that tolerates ±16.5 V overvoltage on any analog input without damage. The internal reference can be overdriven externally for high-accuracy applications. MAX198ACWI is the commercial-temperature (0 °C to +70 °C) grade; MAX198AEWI extends the range to -40 °C to +85 °C.
Typical applications include multi-channel data-acquisition front ends for industrial process control, PLC analog input modules, weigh scale and bridge-sensor digitizers, temperature-monitoring multiplexers (thermocouple/RTD via external signal conditioning), portable instrumentation, and battery-cell monitoring in UPS and renewable-energy systems. Embedded-system designers favor the part for its 6 multiplexed channels on one ADC, eliminating external analog switches and reducing both BOM and PCB area.
When designing with the MAX198ACWI, ensure the analog inputs remain within ±16.5 V to avoid stressing the input-protection network, and bypass VDD with a 10 uF tantalum plus 0.1 uF ceramic combination placed within 1 cm of the supply pin to keep digital switching noise out of the SAR comparator.
This page synthesizes distributor pricing, drop-in alternative parts from the same MAX196/MAX198 family, and practical PCB-layout guidance not found in the bare manufacturer datasheet.
کے لیے ڈراپ اِن متبادل MAX198ACWI — یکساں پیکیج، پن سے پن مطابقت پذیر۔ مختلف پیکیج والے پرزے جن کے لیے PCB دوبارہ کام درکار ہو، شامل نہیں ہیں۔
اس سیریز میں مختلف ورژن
اسی سیریز کے ماڈلز جو ڈراپ اِن مطابقت رکھتے ہیں MAX198ACWI (یکساں فارم فیکٹر اور فٹ پرنٹ) — میں مختلف Number of Channels, Package, Resolution, RoHS Status.
MAX198ACWI+
✅ ڈراپ-اِن📋 حوالہ جاتی متبادل (کیٹلاگ میں نہیں)
MAX198ACWI+T
✅ ڈراپ-اِن📋 حوالہ جاتی متبادل (کیٹلاگ میں نہیں)
MAX198AEWI+
✅ ڈراپ-اِن📋 حوالہ جاتی متبادل (کیٹلاگ میں نہیں)
MAX198BEWI
✅ ڈراپ-اِنقیمت کے لیے رابطہ کریں
ڈیٹا شیٹ دیکھیں →MAX198ACWI زیادہ سے زیادہ ریٹنگز اور برقی خصوصیات
| ریزولوشن | 12 bit |
| Number of Channels | 6 (single-ended, software multiplexed) |
| سیمپلنگ ریٹ | 100 ksps |
| Conversion Architecture | SAR (Successive Approximation Register) |
| سپلائی وولٹیج | +5 V single supply |
| Supply Current (operating) | 7.5 mA typ |
| Supply Current (power-down) | 1 mA typ |
| Input Voltage Range (unipolar, software selectable) | 0 V to +5 V or 0 V to VREF |
| Internal Reference Voltage | 4.096 V ± 1.5% |
| Conversion Time | 6.0 us max |
| Linearity | ±1/2 LSB (AC + DC) |
| Analog Input Overvoltage Protection | ±16.5 V on any input |
| Digital Bus Interface | 12-bit + control, three-state bidirectional |
| Logic Compatibility | TTL/CMOS |
| آپریٹنگ درجہ حرارت رینج | 0 °C to +70 °C (commercial grade) |
| پیکیج | 28-pin wide SOIC (SO W, 0.295 inch / 7.50 mm) |
| ماؤنٹنگ ٹائپ | Surface Mount |
| RoHS اسٹیٹس | Compliant (lead-free version MAX198ACWI+) |
MAX198ACWI پن کنفیگریشن
| پن 1 | AIN0 — Analog input channel 0 |
| پن 2 | AIN1 — Analog input channel 1 |
| پن 3 | AIN2 — Analog input channel 2 |
| پن 4 | AIN3 — Analog input channel 3 |
| پن 5 | AIN4 — Analog input channel 4 |
| پن 6 | AIN5 — Analog input channel 5 |
| پن 7 | AGND — Analog ground |
| پن 8 | REF — Reference output / external reference input (4.096 V internal) |
| پن 9 | REFADJ — Reference adjust input for external trimming |
| پن 10 | VSS — Negative supply (-5 V or 0 V single supply) |
| پن 11 | VDD — +5 V positive supply |
| پن 12 | CLK — External clock input (internal RC default) |
| پن 13 | INT — Conversion-end interrupt output (active low) |
| پن 14 | HBEN — High-byte enable (selects D8-D15 on 16-bit bus) |
| پن 15 | D0/D8 — Data bit 0 (LSB) / bit 8 with HBEN |
| پن 16 | D1/D9 — Data bit 1 / bit 9 |
| پن 17 | D2/D10 — Data bit 2 / bit 10 |
| پن 18 | D3/D11 — Data bit 3 / bit 11 |
| پن 19 | D4/D12 — Data bit 4 / bit 12 |
| پن 20 | D5/D13 — Data bit 5 / bit 13 |
| پن 21 | D6/D14 — Data bit 6 / bit 14 |
| پن 22 | D7/D15 — Data bit 7 (MSB) / bit 15 with HBEN |
| پن 23 | DGND — Digital ground |
| پن 24 | RD — Read strobe (active low) |
| پن 25 | CS — Chip select (active low) |
| پن 26 | WR — Write strobe / channel select write (active low) |
| پن 27 | POL — Polarity select (unipolar/bipolar mode) |
| پن 28 | PD — Power-down input (active high) |
عام استعمالات
MAX198ACWI کے لیے موزوں ہے 6 ایپلیکیشنs: Multi-Channel Industrial Process-Control ADC Front End, PLC Analog Input Module (6-Channel), Weigh-Scale and Bridge Sensor Digitizer, Multi-Sensor Temperature Monitoring (Thermocouple/RTD Aggregator), Battery-Cell Voltage Monitoring in UPS / Renewable Systems, Portable Test and Measurement Instrumentation.
Multi-Channel Industrial Process-Control ADC Front End
The MAX198ACWI suits 4- to 6-channel industrial-control digitizers because it integrates the multiplexer, sample-and-hold, 12-bit SAR ADC, and 4.096 V reference in a single 28-pin SOIC, removing six external analog switches and reducing both BOM cost and PCB area. Its 100 ksps rate and 6 us conversion time allow closed-loop control loops (e.g. PLC analog input modules at 100 Hz per channel) to run with ample time margin. The internal reference is acceptable for many industrial sensors; for thermocouple/junction-temperature precision, an external reference overdrive is supported. The +5 V single-supply operation, ±16.5 V analog input protection, and TTL/CMOS logic levels make it directly compatible with 8051/PIC/ARM host controllers with no glue logic. Power-down current of 1 mA supports battery-backed shutdown in unattended remote sites.
تجویز کردہ
PLC Analog Input Module (6-Channel)
Programmable-logic-controller analog-input cards typically digitize 4, 6, or 8 analog channels at rates up to a few hundred Hz; the MAX198ACWI provides exactly six multiplexed inputs at 12 bits and 100 ksps, well above PLC update-rate requirements. Each channel can be set independently to 0-5 V or 0-VREF (4.096 V) ranges by writing the control register, allowing mixed inputs (e.g. 0-5 V process transmitters and 0-4.096 V load-cell bridges) without external conditioning. The 12-bit three-state data port ties directly to the PLC CPU's parallel bus, with bus-release timing matched to 68HC11/8051 read cycles. The ±16.5 V input clamp protects 24 V field wiring mis-wires (after external resistor-divider sensing).
تجویز کردہ
Weigh-Scale and Bridge Sensor Digitizer
Load cells and strain-gauge bridges typically output millivolt-level signals in a ratiometric configuration; the MAX198ACWI digitizes up to six bridge channels sequentially with 12-bit resolution (4096 codes over 0-4.096 V giving ~1 mV LSB) and the internal 4.096 V reference can be used to excite a ratiometric bridge amplifier. With proper input signal conditioning (instrumentation amplifier with gain 100-1000), the 12-bit envelope gives stable, repeatable scale readings well suited for bench-top and small commercial weigh scales. Power-down mode (1 mA) preserves battery life when the scale enters standby. Industrial applications should migrate to the pin-compatible MAX198AEWI+ for -40 to +85 °C operation.
تجویز کردہ
Multi-Sensor Temperature Monitoring (Thermocouple/RTD Aggregator)
Industrial equipment often monitors several thermocouple or RTD temperature channels simultaneously; the MAX198ACWI's six-input multiplexer digitizes up to six cold-junction-compensated thermocouple or RTD inputs into a host controller through one bus. The 100 ksps aggregate rate allows scan times below 1 ms per channel, well below typical 1 Hz thermal time constants. With a 0-4.096 V input range and 1 mV LSB, an external amplified cold-junction compensation path digitizes accurately. The internal 4.096 V reference can be overdriven by an external MAX150-based reference for higher precision. Hospital-medical and laboratory use cases should add downstream digital filtering.
تجویز کردہ
Battery-Cell Voltage Monitoring in UPS / Renewable Systems
Uninterruptible power supplies and battery energy-storage systems must monitor each cell voltage; the MAX198ACWI scans six cells per chip with 12-bit resolution and 100 ksps throughput, with multiple chips cascaded for higher series-string counts. The unipolar 0-5 V input range covers typical 12 V/24 V battery-block voltages after external resistor dividers, and the +5 V single supply makes it directly compatible with UPS controller boards. Power-down mode (1 mA typ) keeps idle current low in storage systems; the ±16.5 V input protection tolerates transients on stacked-battery strings. Evaluation should also consider MAX11068 dedicated battery monitor for battery-management ICs.
تجویز کردہ
Portable Test and Measurement Instrumentation
Handheld multimeters, data loggers, and bench test equipment often require 4-8 analog input channels; the MAX198ACWI delivers six 12-bit digitized channels at 100 ksps through a compact 28-pin SOIC, leaving ample board space for LCD, keypad, and battery-management circuitry. The 1 mA power-down current is critical for battery-powered portability, and the internal 4.096 V reference eliminates an external precision reference. The A-grade linearity (±1/2 LSB) and the fast 6 us conversion time support both DC and modest-bandwidth AC measurements. Industrial or field-instrument temperature variants should choose the MAX198AEWI+.
تجویز کردہ
تجویز کردہ پروڈکٹس کا خلاصہ
کے لیے انجینئرنگ ریفرنس ڈیٹا MAX198ACWI — موازنہ، ڈیزائن رہنمائی، اور تعمیل کی معلومات۔
انتخاب کی گائیڈ
متبادلات کے ساتھ موازنہ
| پیرامیٹر | یہ پروڈکٹ | MAX198ACWI+ | MAX198ACWI+T | MAX198AEWI+ | MAX198BEWI | MAX196ACAI |
|---|---|---|---|---|---|---|
| Package | 28-SOIC (Wide, 7.50mm) | 28-SOIC (Wide, 7.50mm) | 28-SOIC (Wide, 7.50mm) | 28-SOIC (Wide, 7.50mm) | 28-SOIC (Wide, 7.50mm) | 28-SSOP |
| Brand | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated |
| Resolution | 12 bit | 12 bit | 12 bit | 12 bit | 12 bit | 12 bit |
| Channels | 6 | 6 | 6 | 6 | 6 | 8 |
| Sampling Rate | 100 ksps | 100 ksps | 100 ksps | 100 ksps | 100 ksps | 100 ksps (aggregate) |
| Input Range | Unipolar: 0-5 V, 0-VREF | Unipolar: 0-5 V, 0-VREF | Unipolar: 0-5 V, 0-VREF | Unipolar: 0-5 V, 0-VREF | Unipolar: 0-5 V, 0-VREF | Bipolar: ±5 V, ±VREF |
| Operating Temperature | 0 °C to +70 °C | 0 °C to +70 °C | 0 °C to +70 °C | -40 °C to +85 °C | 0 °C to +70 °C | 0 °C to +70 °C |
| Linearity Grade | A (AC+DC ±1/2 LSB) | A (AC+DC ±1/2 LSB) | A (AC+DC ±1/2 LSB) | A (AC+DC ±1/2 LSB) | B (AC+DC tighter, typically ±3/4 LSB worst-case relaxed but BIN improvement on gain/offset) | A (AC+DC ±1/2 LSB) |
| Qty-1 Distributor Price (USD) | $14.20 | ~$14.20 (lead-free) | ~$14.20 (tape-and-reel) | ~$17-19 | ~$18-22 | ~$14-16 |
اہم امتیازی خصوصیات
- Wide SOIC (28-pin, 0.295 inch) with 6 multiplexed inputs on a single SAR core (بمقابلہMAX196ACAI (28-SSOP))
- Unipolar-only input ranges (0-5 V, 0-VREF) optimized for 4-20 mA and single-rail sensor signals (بمقابلہMAX196ACAI (28-SSOP, bipolar variants))
- Direct same-family drop-in upgrades available on the same 28-SOIC wide footprint (بمقابلہMAX197BCWI (8 channels, bipolar))
ڈیزائن نوٹس
Bypass VDD with a 10 uF tantalum in parallel with 0.1 uF ceramic capacitor placed within 1 cm (0.4 inch) of the supply pin. Place AGND and DGND separated PCB islands and join them at one point near the ADC to avoid ground-loop errors that degrade the 12-bit resolution. Keep analog input traces short and route them away from digital switching lines, particularly INT, RD, and CLK, to avoid digital-to-analog crosstalk into the SAR comparator.
For 100 ksps continuous streaming, the AINx analog inputs source currents of order tens of microamps during the 6 us acquisition window. A source resistance above ~5 kohm will introduce gain error due to the ADC input sampling-charge transient; for high-impedance sources such as strain gauges or RTDs, add a buffer amplifier (e.g., MAX145) between the source and AINx. Long AIN traces should use a driven shield or be guarded by AGND traces to avoid leakage errors.
Avoid continuous overdrive of the analog inputs above ±16.5 V, including transient overvoltages from switching relays or load-dump events - the internal protection clamp can dissipate short but cannot survive indefinite overvoltage. When using an external reference, drive REFADJ accordingly and verify VREF is below the analog-input range selected. The CLK input has a maximum frequency limit; the internal oscillator at ~1.56 MHz provides 6 us conversion time without external drive, and adding an external clock must respect the duty-cycle and rise/fall-time limits in the datasheet.
Estimated: at +5 V with 7.5 mA operating current, the ADC draws about 37.5 mW. The 28-pin wide SOIC thermal resistance theta_JA is approximately 75 °C/W (not stated in provided data, marked [DATA_NEEDED] if exact), giving a junction-to-ambient rise of just under 3 °C - thermal problems are negligible. The 5 V regulator upstream should handle the inrush from VDD; using an LDO such as MAX162BCNG+ downstream of a switching regulator removes the switching ripple that would otherwise appear on VDD and degrade the reference.
تعمیل کی معلومات
The bare-suffix MAX198ACWI (non-lead-free) is RoHS-non-compliant; the lead-free variant MAX198ACWI+ is RoHS-compliant per Maxim/ADI product page. AEC-Q100 is not applicable - this is a commercial-grade data acquisition IC, not an automotive-qualified part.
