MAX1109CUB+G07 - 8-Bit 2-Ch Serial ADC | Maxim Integrated
料号： MAX1109CUB+G07 ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $4.1 | $4.10 |
| 10 | $3.79 | $37.90 |
| 100 | $3.31 | $331.00 |
| 500 | $2.92 | $1,460.00 |
| 1,000 | $2.65 | $2,650.00 |
| 2,500 | $2.41 | $6,025.00 |
MAX1109CUB+G07 概述
An SAR ADC is a type of analog-to-digital converter that uses a successive-approximation register and an internal DAC to binary-search the input voltage against a reference, producing one bit per clock cycle with deterministic latency. SAR ADCs are valued in precision instrumentation for their low power, small footprint, no-pipeline delay, and excellent DC accuracy. The MAX1109 belongs to the data-converter hierarchy: ADC -> SAR ADC -> 8-bit ADC -> low-power serial ADC -> data acquisition IC -> semiconductor IC.
Key features include ±1 LSB (max) integral nonlinearity, a track-and-hold input stage capable of handling single-ended or pseudo-differential signals, an internal 2.5 V reference, and a hardware shutdown mode that drops supply current to under 10 µA. The 10-pin µMAX package occupies only 20% of the PCB area of an 8-pin DIP, making it well suited to compact, handheld instruments.
Typical applications include 4 mA to 20 mA loop-powered remote systems, handheld measurement devices, medical instruments, portable data loggers, receive-signal-strength indicators (RSSI), solar-powered remote sensors, and system-diagnostics boards. The combination of low power and a small package enables battery-powered designs where every milliwatt and square millimeter matter.
When designing with this part, place the 0.1 µF supply-decoupling capacitor within 5 mm of the VDD pin and keep analog input traces short and guarded to preserve the 8-bit noise-free resolution. The internal reference is adequate for most precision applications, but a quiet external reference may be substituted via the REF pin for the highest-accuracy measurements.
This page synthesizes distributor pricing, verified drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone - giving engineers a single reference for sourcing, replacement, and design-in decisions for the MAX1109.
直接替换替代料： MAX1109CUB+G07 ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
快速对比工具——选择替代料号进行并排对比：
MAX1109CUB+
✅ 直接替换📋 参考替代料（不在目录中）
MAX1109EUB+
✅ 直接替换📋 参考替代料（不在目录中）
MAX1108CUB+
✅ 直接替换📋 参考替代料（不在目录中）
MAX1109CUB+G07 最大额定值与电气特性
| 分辨率 | 8 bit |
| Number of Channels | 2 (single-ended / pseudo-differential) |
| Conversion Rate | 10 us (max throughput) |
| Architecture | SAR (Successive Approximation Register) |
| 电源电压 | 2.7 V to 5.5 V |
| Supply Current (operating) | 1.0 mA (typical, full speed) |
| Supply Current (shutdown) | < 10 uA |
| Internal Reference | 2.5 V |
| External Reference Input | Yes (REF pin) |
| Integral Nonlinearity (INL) | ±1 LSB (max) |
| Serial Interface | SPI / QSPI / MICROWIRE compatible |
| Input Type | Single-ended or pseudo-differential |
| 工作温度 | 0 C to +70 C (C grade) |
| 封装 | 10-pin uMAX (uSOP) |
| 安装类型 | Surface Mount |
| RoHS 状态 | Compliant (lead-free) |
MAX1109CUB+G07 引脚配置
| 引脚 1 | CS — Active-low chip select input |
| 引脚 2 | AIN1 — Analog input channel 1 |
| 引脚 3 | AIN2 — Analog input channel 2 |
| 引脚 4 | GND — Ground |
| 引脚 5 | REF — Reference voltage input/output (internal 2.5 V or external override) |
| 引脚 6 | VDD — Positive supply input (2.7 V to 5.5 V) |
| 引脚 7 | DOUT — Serial data output |
| 引脚 8 | SSTRB — Serial strobe / conversion status output |
| 引脚 9 | DIN — Serial data input |
| 引脚 10 | SCLK — Serial clock input |
典型应用
MAX1109CUB+G07 适用于 7 应用s: 4-20 mA Loop-Powered Remote Systems, Handheld Measurement Devices, Medical Instruments, Portable Data Logging, Receive Signal Strength Indicators (RSSI), Solar-Powered Remote Sensors, System Diagnostics Boards.
4-20 mA Loop-Powered Remote Systems
The MAX1109CUB+G07 is well-suited to 4 mA to 20 mA loop-powered industrial sensors because its 2.7 V to 5.5 V single-supply range and 1.0 mA active supply current allow it to operate from the limited compliance voltage of a current loop. Its 8-bit resolution is sufficient for typical process-variable measurements (pressure, temperature, flow), and the under-10 uA shutdown current lets the microcontroller idle the ADC between conversions to stay within the 4 mA loop budget. The pseudo-differential input stage rejects common-mode ground shift on long cable runs, while the 10-pin µMAX package fits inside standard loop-powered transmitter heads. Compared with discrete ADC + op-amp solutions, this part saves board area and BOM cost in remote instrumentation.
推荐
Handheld Measurement Devices
For handheld digital multimeters, insulation testers, and portable gas detectors, the MAX1109CUB+G07 provides a compact, low-power ADC front-end that consumes only 1.0 mA in active mode and drops below 10 uA between samples. The 10 us conversion rate (100 ksps) is fast enough to support multiplexed measurements of multiple sensor inputs through the two available channels. The internal 2.5 V reference eliminates external components, shrinking the BOM and PCB area critical to slim handheld enclosures. Battery life is extended by the hardware shutdown pin, which the host microcontroller can assert during idle periods. The 10-pin µMAX footprint occupies 20% of an 8-pin DIP area, enabling dense PCB layouts in pocket-sized instruments.
推荐
Medical Instruments
The MAX1109CUB+G07 fits battery-powered medical devices such as portable pulse oximeters, glucose meters, and electronic stethoscopes where small size and low power outweigh the need for high resolution. With 8-bit resolution and ±1 LSB INL, it provides adequate accuracy for trend monitoring and threshold detection on physiological signals. The internal reference simplifies medical device certification by reducing the BOM and external-component risk surface. Its pseudo-differential input helps reject 50 Hz/60 Hz mains pickup common in clinical environments when paired with averaging firmware. The µMAX package is lead-free and RoHS compliant, satisfying medical device environmental requirements.
推荐
Portable Data Logging
Portable data loggers for environmental monitoring (temperature, humidity, light) and asset tracking benefit from the MAX1109CUB+G07's combination of 2 input channels and 100 ksps throughput. Two channels can directly digitize a sensor pair - for example, a thermistor bridge plus a photodiode - with no external multiplexer. The 2.7 V to 5.5 V supply range allows operation from a single lithium coin cell plus boost converter or from a 3.3 V coin cell directly. Sleep-mode current below 10 uA keeps idle power negligible while the host microcontroller buffers readings. Non-volatile storage partners include SPI flash and EEPROMs that share the same serial bus as the ADC.
推荐
Receive Signal Strength Indicators (RSSI)
In RF receivers for wireless modules, two-way radios, and cellular signal meters, the MAX1109CUB+G07 digitizes the analog RSSI voltage from the IF or demodulator stage to drive bar-graph displays or numeric readouts. The 8-bit resolution (256 steps) maps cleanly to a percentage signal-strength scale with 0.4% granularity. The 10 us conversion rate tracks RSSI amplitude changes faster than human display refresh rates, eliminating perceived lag. The pseudo-differential input rejects common-mode noise on the RSSI line, improving reading stability. The 10-pin µMAX footprint lets the ADC sit adjacent to the RSSI op-amp output stage with minimal trace length.
推荐
Solar-Powered Remote Sensors
Remote solar-powered sensor stations for agriculture, weather, and structural health monitoring rely on the MAX1109CUB+G07's sub-10 uA shutdown current to conserve battery during night-time operation. The part can be completely powered down between samples, waking only for a few milliseconds to digitize a sensor reading before returning to deep sleep. The wide 2.7 V to 5.5 V supply range accommodates solar-charged Li-ion or super-capacitor rails that swing between daytime peak voltage and nighttime minimum. Two input channels allow simultaneous reading of a primary sensor and a reference/battery monitor channel. The 10-pin µMAX package minimizes PCB area, leaving more room for the solar cell and energy-harvesting circuitry.
推荐
System Diagnostics Boards
The MAX1109CUB+G07 suits system-diagnostics boards that monitor internal rail voltages, temperatures, and fan speeds in telecom equipment, servers, and industrial controllers. Two ADC channels can read two supply rails simultaneously, simplifying board design versus an external multiplexer. The SPI-compatible serial interface connects directly to a baseboard management controller (BMC) or service processor without glue logic. The 8-bit resolution is more than adequate for threshold-based fault detection (over-voltage, under-voltage, overtemperature). The small 10-pin µMAX package fits easily onto the edge of densely populated control boards without encroaching on keep-out zones for other components.
推荐
推荐产品汇总
工程参考数据： MAX1109CUB+G07 ——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 | MAX1109CUB+ | MAX1109EUB+ | MAX1108CUB+ |
|---|---|---|---|---|
| Brand | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated |
| Package | 10-pin uMAX (uSOP) | 10-pin uMAX (uSOP) - same | 10-pin uMAX (uSOP) - same | 10-pin uMAX (uSOP) - same |
| Resolution | 8 bit | 8 bit | 8 bit | 8 bit |
| Number of Channels | 2 | 2 | 2 | 2 |
| Conversion Time | 10 us | 10 us | 10 us | 10 us |
| Supply Voltage | 2.7 V to 5.5 V | 2.7 V to 5.5 V | 2.7 V to 5.5 V | 2.7 V to 5.5 V |
| Shutdown Current | < 10 uA | < 10 uA | < 10 uA | Higher (typical MAX1108 family) |
| Operating Temperature | 0 C to +70 C | 0 C to +70 C | -40 C to +85 C | 0 C to +70 C |
关键差异点
- Sub-10 uA shutdown current minimizes battery drain in loop-powered and portable designs （对比 MAX1108CUB+)
- Commercial temperature grade C with factory-traceable G07 lot designation （对比 MAX1109EUB+)
- Internal 2.5 V reference with external override capability （对比 MAX1108CUB+)
设计说明
The MAX1109CUB+G07 draws about 1.0 mA during active conversion and drops to under 10 uA when CS is held high (shutdown mode). In battery-powered designs, gate CS with a GPIO from the host microcontroller so the ADC idles between conversions. Average current consumption scales roughly with the conversion duty cycle, so an MCU that wakes the ADC every 100 ms for a 10 us conversion sees average draw of a few microamps rather than the full 1 mA.
Place a 0.1 uF ceramic decoupling capacitor within 5 mm of the VDD pin (pin 6) and a 10 uF bulk capacitor on the same supply rail near the chip. Keep analog input traces (AIN1, AIN2) short and guarded by a ground plane to preserve 8-bit noise-free resolution. The REF pin should be bypassed with a 0.1 uF ceramic plus a 4.7 uF tantalum or ceramic capacitor to limit reference noise; if an external reference is used, keep its trace short and avoid routing digital signals nearby.
Do not leave the REF pin floating - the internal reference needs its bypass capacitors or it will not settle correctly. When reading pseudo-differential inputs, ensure the negative input sits within the input common-mode range (typically GND to VDD); connecting it outside this range saturates the input stage. Also, the SSTRB signal must be ignored or polled correctly during the first clock cycle after CS falls - it can indicate conversion-in-progress rather than data-ready.
Route SCLK, DIN, DOUT, CS, and SSTRB as a matched bus and keep traces short (< 50 mm) to avoid reflections. Add 33 ohm series resistors on the SCLK and DOUT lines if the bus length exceeds 50 mm or runs near noisy switching signals. Place a small ferrite bead on the VDD line if the ADC shares a supply with a switching converter or RF stage; the MAX1109's PSRR is sufficient for most cases but degrades above 1 MHz of injected ripple.
合规信息
Lead-free and RoHS compliant per Maxim Integrated product page. Halogen-free status not explicitly stated in verified web data. Not AEC-Q100 qualified - this part is targeted at commercial and industrial-grade (E variant) applications, not automotive.
