MAX198ACWI - 6-Channel 12-Bit DAS, 5V, 100kSPS | Maxim/ADI
料号： MAX198ACWI ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $14.2 | $14.20 |
| 10 | $12.65 | $126.50 |
| 100 | $11.1 | $1,110.00 |
| 500 | $9.95 | $4,975.00 |
| 1,000 | $8.8 | $8,800.00 |
MAX198ACWI 概述
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.
直接替换替代料： MAX198ACWI ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
本系列中的变体
可与以下型号直接替换的同系列型号： MAX198ACWI （相同外形与封装尺寸） ——差异在于 Number of Channels, Package, Resolution, RoHS Status.
快速对比工具——选择替代料号进行并排对比：
MAX198ACWI+
✅ 直接替换📋 参考替代料（不在目录中）
MAX198ACWI+T
✅ 直接替换📋 参考替代料（不在目录中）
MAX198AEWI+
✅ 直接替换📋 参考替代料（不在目录中）
MAX198BEWI
✅ 直接替换✓ 有现货
$16.38 / 个
查看数据手册 →MAX198ACWI 最大额定值与电气特性
| 分辨率 | 12 bit |
| Number of Channels | 6 (single-ended, software multiplexed) |
| 采样率 | 100 ksps |
| Conversion Architecture | SAR (Successive Approximation Register) |
| 电源电压 | +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 |
| 工作温度范围 | 0 °C to +70 °C (commercial grade) |
| 封装 | 28-pin wide SOIC (SO W, 0.295 inch / 7.50 mm) |
| 安装类型 | Surface Mount |
| RoHS 状态 | Compliant (lead-free version MAX198ACWI+) |
MAX198ACWI 引脚配置
| 引脚 1 | AIN0 — Analog input channel 0 |
| 引脚 2 | AIN1 — Analog input channel 1 |
| 引脚 3 | AIN2 — Analog input channel 2 |
| 引脚 4 | AIN3 — Analog input channel 3 |
| 引脚 5 | AIN4 — Analog input channel 4 |
| 引脚 6 | AIN5 — Analog input channel 5 |
| 引脚 7 | AGND — Analog ground |
| 引脚 8 | REF — Reference output / external reference input (4.096 V internal) |
| 引脚 9 | REFADJ — Reference adjust input for external trimming |
| 引脚 10 | VSS — Negative supply (-5 V or 0 V single supply) |
| 引脚 11 | VDD — +5 V positive supply |
| 引脚 12 | CLK — External clock input (internal RC default) |
| 引脚 13 | INT — Conversion-end interrupt output (active low) |
| 引脚 14 | HBEN — High-byte enable (selects D8-D15 on 16-bit bus) |
| 引脚 15 | D0/D8 — Data bit 0 (LSB) / bit 8 with HBEN |
| 引脚 16 | D1/D9 — Data bit 1 / bit 9 |
| 引脚 17 | D2/D10 — Data bit 2 / bit 10 |
| 引脚 18 | D3/D11 — Data bit 3 / bit 11 |
| 引脚 19 | D4/D12 — Data bit 4 / bit 12 |
| 引脚 20 | D5/D13 — Data bit 5 / bit 13 |
| 引脚 21 | D6/D14 — Data bit 6 / bit 14 |
| 引脚 22 | D7/D15 — Data bit 7 (MSB) / bit 15 with HBEN |
| 引脚 23 | DGND — Digital ground |
| 引脚 24 | RD — Read strobe (active low) |
| 引脚 25 | CS — Chip select (active low) |
| 引脚 26 | WR — Write strobe / channel select write (active low) |
| 引脚 27 | POL — Polarity select (unipolar/bipolar mode) |
| 引脚 28 | PD — Power-down input (active high) |
典型应用
MAX198ACWI 适用于 6 应用s: 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.
推荐
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).
推荐
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.
推荐
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.
推荐
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.
推荐
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+.
推荐
推荐产品汇总
工程参考数据： MAX198ACWI ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | 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 |
关键差异点
- Wide SOIC (28-pin, 0.295 inch) with 6 multiplexed inputs on a single SAR core （对比 MAX196ACAI (28-SSOP))
- Unipolar-only input ranges (0-5 V, 0-VREF) optimized for 4-20 mA and single-rail sensor signals （对比 MAX196ACAI (28-SSOP, bipolar variants))
- Direct same-family drop-in upgrades available on the same 28-SOIC wide footprint （对比 MAX197BCWI (8 channels, bipolar))
设计说明
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.
合规信息
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.
