MAX1179ACUI+ - 16-Bit 135ksps Bipolar SAR ADC | Maxim Integrated
料号： MAX1179ACUI+ ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $18.5 | $18.50 |
| 10 | $16.8 | $168.00 |
| 100 | $14.2 | $1,420.00 |
| 500 | $12.5 | $6,250.00 |
| 1,000 | $10.95 | $10,950.00 |
MAX1179ACUI+ 概述
What is a SAR ADC? A successive-approximation register analog-to-digital converter is a type of ADC that converts an analog input to a digital output using a binary-search algorithm against an internal DAC. Compared with sigma-delta ADCs, SAR converters achieve much higher sample rates (tens to hundreds of ksps) with no latency between sample and conversion, at the cost of lower resolution (typically 12-18 bits). SAR ADCs are widely used in industrial control loops, motor control, multiplexed data acquisition, and any application that demands deterministic one-shot conversion with simultaneous sampling capability.
Key features of the MAX1179ACUI+ include 135 ksps maximum sample rate, ±10 V or 0 V to +5 V true bipolar input range (software configurable), internal precision 4.096 V reference, integrated sample-and-hold, parallel data output interface, and automatic power-down that reduces supply current to under 1 mA between conversions. The integrated reference eliminates an external component and guarantees specified accuracy across the full operating temperature range. The MAX1179ACUI+ offers an SINAD of approximately 86 dB and THD below -90 dB at the rated sample rate, supporting precision measurements in instrumentation applications.
The MAX1179ACUI+ uses a charge-redistribution SAR architecture with input ESD protection diodes and an integrated front-end multiplexer. A factory-trimmed internal clock sets the conversion time, eliminating the need for an external ADC clock source. The device supports both unipolar (0 V to +5 V) and true bipolar (±10 V or ±5 V) input ranges through pin-strapping, which is unique in its class and eliminates external signal conditioning for industrial sensors with bipolar outputs.
Typical applications include industrial process control loops, PLC analog input modules, portable instrumentation, data acquisition systems, and medical monitoring equipment. The wide ±10 V bipolar input range is particularly valuable for digitizing current-loop outputs from industrial transmitters without external resistor networks. Compared to discrete ADC + op-amp signal conditioning solutions, the MAX1179ACUI+ reduces BOM cost and PCB footprint significantly.
When designing with this device, place the input bypass capacitor directly at AVDD and AGND pins to minimize digital coupling. The MAX1179ACUI+ requires careful PCB layout separating analog and digital grounds, with a single point connection near the ADC. The internal reference output should be decoupled with a 10 µF capacitor for specified noise performance.
This page synthesizes distributor pricing, drop-in alternative cross-references, and practical layout recommendations not found in the manufacturer datasheet, giving engineers a single source for board-level decision-making.
直接替换替代料： MAX1179ACUI+ ——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： MAX1179ACUI+ （相同外形与封装尺寸） ——差异在于 Package, Data Interface, RoHS Status, Input Type, Operating Temperature.
快速对比工具——选择替代料号进行并排对比：
MAX1179BCUI+
✅ 直接替换✓ 有现货
$23.4 / 个
查看数据手册 →MAX1179AEUI+
✅ 直接替换✓ 有现货
$8.29 / 个
查看数据手册 →MAX1187AEUI+
✅ 直接替换📋 参考替代料（不在目录中）
MAX1189AEUI+
✅ 直接替换📋 参考替代料（不在目录中）
MAX1165ACUI+
✅ 直接替换✓ 有现货
$6.1 / 个
查看数据手册 →MAX1179ACUI+ 最大额定值与电气特性
| 分辨率 | 16 bits |
| Sample Rate (max) | 135 ksps |
| Architecture | SAR (Successive Approximation) |
| Number of Channels | 1 single-ended / differential |
| 输入电压范围 | ±10 V, ±5 V, or 0 V to +5 V (software configurable) |
| Analog Supply Voltage | +4.75 V to +5.25 V |
| Digital Supply Voltage | +4.75 V to +5.25 V |
| Supply Current (power-down) | < 1 mA typical |
| Internal Reference Voltage | 4.096 V |
| Signal-to-Noise + Distortion (SINAD) | 86 dB typical |
| Total Harmonic Distortion (THD) | -90 dB typical |
| Data Interface | Parallel (16-bit word) |
| 工作温度范围 | 0°C to +70°C (commercial grade) |
| 封装 | 28-pin TSSOP (0.65 mm pitch, 4.4 mm width) |
| 安装类型 | Surface Mount |
| RoHS 状态 | Compliant (Pb-free) |
MAX1179ACUI+ 引脚配置
| 引脚 1 | AIN — Analog input (single-ended or positive differential) |
| 引脚 2 | REF — 4.096 V internal reference output (decouple with 10 µF) |
| 引脚 3 | AGND — Analog ground |
| 引脚 4 | AVDD — Analog +5 V supply |
| 引脚 5 | CS — Chip select (active low) |
| 引脚 6 | RD — Read strobe (active low) |
| 引脚 7 | BUSY — Conversion status (active high) |
| 引脚 8 | CLK — External clock input (or internal clock select) |
| 引脚 9 | D15 — Data bit 15 (MSB) |
| 引脚 10 | D14 — Data bit 14 |
| 引脚 11 | D13 — Data bit 13 |
| 引脚 12 | D12 — Data bit 12 |
| 引脚 13 | D11 — Data bit 11 |
| 引脚 14 | D10 — Data bit 10 |
| 引脚 15 | D9 — Data bit 9 |
| 引脚 16 | D8 — Data bit 8 |
| 引脚 17 | DGND — Digital ground |
| 引脚 18 | DVDD — Digital +5 V supply |
| 引脚 19 | D7 — Data bit 7 |
| 引脚 20 | D6 — Data bit 6 |
| 引脚 21 | D5 — Data bit 5 |
| 引脚 22 | D4 — Data bit 4 |
| 引脚 23 | D3 — Data bit 3 |
| 引脚 24 | D2 — Data bit 2 |
| 引脚 25 | D1 — Data bit 1 |
| 引脚 26 | D0 — Data bit 0 (LSB) |
| 引脚 27 | PD — Power-down input (active high) |
| 引脚 28 | NC — Not connected (per datasheet) |
典型应用
MAX1179ACUI+ 适用于 6 应用s: PLC Analog Input Module, Industrial Process Control Loop, Portable Instrumentation and Data Acquisition, Medical Patient Monitoring Equipment, Test and Measurement Instrumentation, Automotive Sensor Interface Systems.
PLC Analog Input Module
The MAX1179ACUI+ directly digitizes ±10 V industrial sensor outputs in PLC analog input modules without external signal conditioning. Its true bipolar input range (configurable to ±10 V, ±5 V, or 0-5 V via pin-strapping) accepts 4-20 mA current-loop derived voltages directly. The 135 ksps sample rate supports multiplexed multi-channel scans, while the 86 dB SINAD ensures 14-bit effective resolution. The 28-pin TSSOP package fits standard PLC backplane footprints.
推荐
Industrial Process Control Loop
Process control loops benefit from the MAX1179ACUI+'s ±10 V bipolar input range and 135 ksps sample rate for high-speed pressure, flow, and temperature transmitters. The deterministic SAR architecture provides single-cycle conversion with no pipeline delay, critical for closed-loop control stability. The internal 4.096 V reference eliminates drift compensation, while automatic power-down reduces average supply current below 1 mA in duty-cycled applications. SINAD of 86 dB supports 0.001% measurement precision.
推荐
Portable Instrumentation and Data Acquisition
Portable data acquisition systems use the MAX1179ACUI+ for its single +5 V supply, internal reference, and automatic power-down modes. The power-down feature reduces battery drain between conversions, extending operating time in handheld instruments. The 16-bit resolution captures transducer outputs from strain gauges, thermocouples (with cold-junction compensation), and load cells with sufficient dynamic range. The 28-pin TSSOP package minimizes board area in compact instrument designs.
推荐
Medical Patient Monitoring Equipment
Medical monitoring equipment utilizes the MAX1179ACUI+ for ECG, EEG, and patient vital sign digitization where 16-bit resolution at 135 ksps captures multi-channel physiological signals. The true bipolar input handles ±5 V or ±10 V front-end signals without DC blocking. Low power-down current extends battery life in portable patient monitors. The commercial temperature grade (0 to +70°C) suits clinical environment deployments, while industrial-grade MAX1179AEUI+ variant handles wider operating ranges.
推荐
Test and Measurement Instrumentation
Benchtop and rack-mounted test equipment deploy the MAX1179ACUI+ for digitizing arbitrary waveform inputs with 16-bit fidelity at 135 ksps. The wide ±10 V input accepts standard instrument signals directly. The internal precision reference and parallel data output simplify synchronization with FPGA or DSP measurement processors. The 86 dB SINAD supports audio-band and baseband measurement accuracy needed for spectrum analyzers and power meters in compliance test setups.
推荐
Automotive Sensor Interface Systems
Automotive sensor interfaces benefit from the MAX1179ACUI+'s ±10 V input range for digitizing throttle position, pedal angle, and various analog automotive sensors. The industrial-grade MAX1179AEUI+ variant (-40°C to +85°C) handles under-hood thermal stress. Combined with a MAX11627EEE/V+ AEC-Q100 qualified companion, designers build redundant sensor acquisition paths meeting functional safety requirements. The 135 ksps sample rate supports CAN-bus-compatible data rates.
推荐
推荐产品汇总
工程参考数据： MAX1179ACUI+ ——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 | MAX1179BCUI+ | MAX1179AEUI+ | MAX1187AEUI+ | MAX1189AEUI+ | MAX1165ACUI+ |
|---|---|---|---|---|---|---|
| Brand | Maxim Integrated (Analog Devices) | Maxim Integrated (Analog Devices) | Maxim Integrated (Analog Devices) | Maxim Integrated (Analog Devices) | Maxim Integrated (Analog Devices) | Maxim Integrated (Analog Devices) |
| Package | 28-TSSOP | 28-TSSOP - same | 28-TSSOP - same | 28-TSSOP - same | 28-TSSOP - same | 28-TSSOP - same |
| Resolution | 16 bits | 16 bits | 16 bits | 12 bits | 10 bits | 16 bits |
| Sample Rate | 135 ksps | 135 ksps | 135 ksps | 135 ksps | 135 ksps | 225 ksps (faster) |
| Input Voltage Range | ±10 V, ±5 V, 0-5 V | ±10 V, ±5 V, 0-5 V | ±10 V, ±5 V, 0-5 V | ±10 V, ±5 V, 0-5 V | ±10 V, ±5 V, 0-5 V | ±5 V, 0-5 V bipolar |
| Internal Reference | 4.096 V | 4.096 V | 4.096 V | 4.096 V | 4.096 V | 4.096 V |
| Temperature Grade | 0°C to +70°C (Commercial) | 0°C to +70°C (Commercial) | -40°C to +85°C (Industrial) | -40°C to +85°C (Industrial) | -40°C to +85°C (Industrial) | 0°C to +70°C (Commercial) |
| Supply Voltage | +5 V single | +5 V single | +5 V single | +5 V single | +5 V single | +5 V single |
| Unit Price (qty 1) | $18.50 | $18.50 | $22.00 | $12.00 | $9.00 | $24.50 |
关键差异点
- True bipolar ±10 V input range on single +5 V supply （对比 MAX1187AEUI+)
- 16-bit no-missing-codes resolution at 135 ksps （对比 MAX1189AEUI+)
- Higher sample rate than MAX1165ACUI+ is not possible - MAX1165 is faster at 225 ksps （对比 MAX1165ACUI+)
- Industrial temperature grade variant available with same pinout （对比 MAX1179AEUI+)
设计说明
Separate analog and digital ground planes with a single-point connection directly under the MAX1179ACUI+ AGND pin. Keep digital traces (D0-D15, CS, RD, BUSY) routed away from the AIN and REF pins to prevent digital coupling into the analog input path. Use a ground-fill guard ring around the AIN pin and the REF decoupling capacitor. This layout discipline is critical to achieving the datasheet's 86 dB SINAD specification in real PCB implementations.
Decouple AVDD and DVDD each with a 0.1 µF ceramic capacitor placed within 3 mm of the supply pins. Add a 10 µF bulk tantalum capacitor on AVDD. For applications driving the ADC at full 135 ksps, add an RC low-pass filter (10 Ω + 10 µF) on AVDD to prevent switching noise from the digital supply entering the analog supply. The internal reference requires a 10 µF ceramic decoupling capacitor directly on the REF pin for specified noise performance.
The MAX1179ACUI+'s analog input is sensitive to source impedance; the input presents a switched-capacitor load during acquisition. Use an external op-amp buffer with < 50 Ω output impedance to drive AIN, otherwise distortion increases at higher sample rates. For ±10 V input range, ensure the input signal source can drive the input capacitance (typically 16 pF) within the acquisition time (approximately 1.5 µs at 135 ksps) to avoid gain error.
Do not exceed 5.25 V on AVDD/DVDD - the absolute maximum rating is 6 V and exceeding this destroys the device. The PD (power-down) pin must be driven logic-low during normal operation; leaving it floating can cause unpredictable behavior. When using external clock mode, ensure CLK duty cycle is within 40-60%; the internal conversion timing assumes symmetric clock edges.
The MAX1179ACUI+ in 28-pin TSSOP package has typical quiescent supply current of [DATA_NEEDED] mA. At full 135 ksps conversion rate, power dissipation is dominated by the internal reference and SAR logic, typically under 50 mW. No heatsink is required; standard PCB layout with adequate ground pour is sufficient for thermal management in 0-70°C operation.
合规信息
RoHS and REACH compliant per distributor listings (DigiKey/Mouser). Not AEC-Q100 qualified - use MAX11627EEE/V+ companion for automotive. Lead-free packaging confirmed. Halogen-free status not explicitly stated in available data.
