MAX1323ECM+ - 14-Bit 526ksps Parallel ADC, 48-LQFP | Maxim Integrated
MPN： MAX1323ECM+ ✓ 啟用中MAX1323ECM+ 概覽
An ADC (analog-to-digital converter) is a mixed-signal IC that samples a continuous analog voltage and converts it into a discrete digital code, forming the bridge between the analog front-end (sensors, amplifiers, filters) and the digital back-end (microcontroller, DSP, FPGA). In the system hierarchy the MAX1323ECM+ sits between the analog signal chain and the digital processor; it is categorized as a successive-approximation register (SAR) ADC with sub-MHz sample rates for industrial data acquisition, instrumentation, and process-control loops.
Key features include 526 ksps throughput, 78 dB SINAD, an integrated +2.5V reference, input range scaling resistors, internal or external clock option, and a low-power shutdown mode that drops quiescent current to under 10 µA. The integrated input clamp protects against ESD and out-of-range signals; an input overvoltage of ±25V does not damage the part. Power consumption is approximately 38 mW at full sampling rate.
The MAX1323ECM+ uses a charge-distribution DAC and successive-approximation register architecture. A single conversion is completed in 1.9 µs; the parallel output latches the result on the rising edge of RD and remains valid until the next read. The 2.5V internal reference is trimmed to ±2% and can source up to 1 mA for external use.
Typical applications include multi-channel data-acquisition boards (paired with analog multiplexers), vibration and strain-gauge instrumentation, motor-control feedback loops, medical patient-monitoring equipment, and process-control analog input modules. In these systems it replaces the slower 12-bit ADCs common in legacy designs while maintaining pin compatibility with the MAX130x and MAX131x families.
When designing with this part, place a 0.1 µF ceramic bypass capacitor within 5 mm of the +5V supply pin and a 10 µF tantalum bulk capacitor at the supply entry to suppress digital switching noise. Ensure the parallel bus traces are length-matched to within 25 mm to avoid skew-induced read errors at full speed.
This page synthesizes distributor pricing, drop-in alternatives from the MAX131x/MAX132x family, and practical design notes not found in the manufacturer datasheet alone.
直接替換替代品，適用於 MAX1323ECM+ — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： MAX1323ECM+ （相同外形與佔位） — 差異在於 Package, Architecture, Digital Supply Voltage, Resolution, RoHS Status.
MAX1323ECM+T
✅ 直接替換📋 參考替代品（不在目錄中）
MAX1319ECM+
✅ 直接替換聯絡詢價
查看資料表 →MAX1319ECM+T
✅ 直接替換聯絡詢價
查看資料表 →MAX1327ECM+
✅ 直接替換聯絡詢價
查看資料表 →LTC1864
✅ 直接替換📋 參考替代品（不在目錄中）
MAX1323ECM+ 最大額定值與電氣特性
| 解析度 | 14 bit |
| Number of Channels | 1 |
| Sample Rate | 526 ksps |
| Analog Input Range | 0 V to +5 V (unipolar) |
| Input Overvoltage Protection | ±25 V |
| INL (Max) | ±1 LSB |
| Supply Voltage (Analog) | +5 V ±5% |
| Supply Voltage (Digital) | +5 V ±5% |
| 關機電流 | <10 µA |
| Internal Reference | +2.5 V ±2% |
| Digital Interface | Parallel (word/byte-selectable) |
| 工作溫度 | -40 °C to +85 °C (industrial) |
| 封裝 | 48-LQFP (7 mm x 7 mm) |
| 安裝類型 | Surface Mount |
| RoHS 狀態 | Compliant |
| Architecture | SAR (successive-approximation) |
| Conversion Time | 1.9 µs (typical) |
MAX1323ECM+ 腳位配置
| 腳位 1 | D13 — Parallel data output bit 13 (MSB) |
| 腳位 2 | D12 — Parallel data output bit 12 |
| 腳位 3 | D11 — Parallel data output bit 11 |
| 腳位 4 | D10 — Parallel data output bit 10 |
| 腳位 5 | D9 — Parallel data output bit 9 |
| 腳位 6 | D8 — Parallel data output bit 8 |
| 腳位 7 | D7 — Parallel data output bit 7 |
| 腳位 8 | D6 — Parallel data output bit 6 |
| 腳位 9 | D5 — Parallel data output bit 5 |
| 腳位 10 | D4 — Parallel data output bit 4 |
| 腳位 11 | D3 — Parallel data output bit 3 |
| 腳位 12 | D2 — Parallel data output bit 2 |
| 腳位 13 | D1 — Parallel data output bit 1 |
| 腳位 14 | D0 — Parallel data output bit 0 (LSB) |
| 腳位 15 | DGND — Digital ground |
| 腳位 16 | DVDD — Digital +5 V supply |
| 腳位 17 | HBEN — High-byte enable (selects 8-bit bus mode) |
| 腳位 18 | CS — Chip select (active low) |
| 腳位 19 | RD — Read strobe (active low) |
| 腳位 20 | INT — Conversion complete interrupt |
| 腳位 21 | CLK — External clock input (optional; internal RC default) |
| 腳位 22 | SHDN — Shutdown input (active high) |
| 腳位 23 | REF — +2.5 V reference output / external reference input |
| 腳位 24 | AGND — Analog ground |
| 腳位 25 | AIN — Analog input |
| 腳位 26 | AVDD — Analog +5 V supply |
| 腳位 27 | NC — Not connected |
| 腳位 28 | NC — Not connected |
| 腳位 29 | NC — Not connected |
| 腳位 30 | NC — Not connected |
| 腳位 31 | NC — Not connected |
| 腳位 32 | NC — Not connected |
| 腳位 33 | NC — Not connected |
| 腳位 34 | NC — Not connected |
| 腳位 35 | NC — Not connected |
| 腳位 36 | NC — Not connected |
| 腳位 37 | NC — Not connected |
| 腳位 38 | NC — Not connected |
| 腳位 39 | NC — Not connected |
| 腳位 40 | NC — Not connected |
| 腳位 41 | NC — Not connected |
| 腳位 42 | NC — Not connected |
| 腳位 43 | NC — Not connected |
| 腳位 44 | NC — Not connected |
| 腳位 45 | NC — Not connected |
| 腳位 46 | NC — Not connected |
| 腳位 47 | NC — Not connected |
| 腳位 48 | NC — Not connected |
典型應用
MAX1323ECM+ 適用於 6 應用s: Multi-Channel Industrial Data Acquisition, Vibration and Strain-Gauge Instrumentation, Process-Control Analog Input Modules, Medical Patient Monitoring Equipment, Motor Control Feedback Loops, Test & Measurement Instrumentation.
Multi-Channel Industrial Data Acquisition
The MAX1323ECM+ is widely deployed in multi-channel industrial DAQ boards where each ADC channel is paired with a downstream analog multiplexer or instrumentation front-end. Its 526 ksps throughput supports sampling of 8 multiplexed channels at 50+ ksps per channel with comfortable headroom. The 78 dB SINAD at 100 kHz input provides the dynamic range needed for 14-bit precision measurement of strain gauge, RTD, and 4-20 mA loop signals after front-end conditioning. The integrated +2.5 V reference eliminates a separate reference IC, while the ±25 V input overvoltage clamp protects the converter from field wiring faults common in factory environments. For higher channel counts, the pin-compatible MAX1327ECM+ adds an internal 8-channel mux on the same footprint.
推薦
Vibration and Strain-Gauge Instrumentation
The MAX1323ECM+ is well suited to vibration monitoring and strain-gauge bridge readout modules that demand both wide dynamic range and high sampling rate. With 78 dB SINAD and 526 ksps throughput, the converter captures the harmonic content of mechanical vibration signatures while maintaining sufficient ENOB for FFT analysis. Its 14-bit resolution resolves sub-100 microstrain signals when the bridge excitation is properly conditioned. The 48-LQFP package provides robust mechanical attachment for vibration-prone industrial environments, and the parallel interface allows direct connection to FPGAs performing real-time DSP (FFT, envelope detection) without DMA latency.
推薦
Process-Control Analog Input Modules
PLC analog input modules use the MAX1323ECM+ to digitize thermocouple, RTD, and 4-20 mA loop signals with 14-bit precision. The 526 ksps throughput allows a single ADC to scan all 8 channels of a typical PLC card at the scan rate mandated by IEC 61131-2 industrial standards. The internal +2.5 V reference, after external buffering, serves as the excitation source for ratiometric measurements, simplifying the analog front-end design. The -40 °C to +85 °C industrial temperature range ensures compliance with factory-floor environmental specifications, and the 48-LQFP package is compatible with the pin-compatible MAX1327ECM+ when higher channel counts are needed.
推薦
Medical Patient Monitoring Equipment
Medical patient monitoring systems such as multi-parameter bedside monitors and ECG/EEG acquisition front-ends use the MAX1323ECM+ for high-precision digitization of low-amplitude bioelectric signals. The 78 dB SINAD over the 20 Hz to 100 kHz input band provides the dynamic range needed to capture both low-amplitude cardiac waveforms and higher-frequency artifact components. With 14-bit resolution and 526 ksps throughput, the device easily accommodates 8-channel ECG front-ends at the clinical sampling rates (500 Hz to 10 kHz per channel) mandated by IEC 60601-1 medical electrical equipment standards. The integrated input protection simplifies compliance with patient isolation requirements.
推薦
Motor Control Feedback Loops
Three-phase motor drive inverter control loops use the MAX1323ECM+ to digitize phase current and DC bus voltage feedback signals for field-oriented control (FOC) and sensorless trapezoidal commutation algorithms. The 526 ksps throughput easily supports PWM switching frequencies of 20-50 kHz with current-loop sample rates of 100+ ksps per phase. The 14-bit resolution is sufficient for torque-ripple minimization and accurate current loop closure. The parallel interface allows the ADC to connect directly to the control DSP/MCU's external memory bus for sub-microsecond latency. The internal +2.5 V reference simplifies the analog front-end; pin-compatible MAX1327ECM+ adds 8-channel scanning capability for full three-phase drives plus DC bus.
推薦
Test & Measurement Instrumentation
Bench-top and rack-mount digital multimeters, oscilloscope front-ends, and data loggers use the MAX1323ECM+ as a high-speed auxiliary ADC for sample-and-measure channels that exceed the main system ADC's rate capability. The 526 ksps throughput and 14-bit resolution deliver a 78 dB SINAD dynamic range, sufficient for 6.5-digit DMM DC accuracy and 100 MHz-class oscilloscope scaled aux inputs. The parallel interface simplifies integration with FPGA-based trigger engines. The integrated +2.5 V reference reduces drift-induced error in long-duration measurement campaigns. Pin-compatibility with the MAX1327ECM+ allows reuse of the same PCB layout for both single-channel DMM inputs and multi-channel loggers.
推薦
推薦產品摘要
工程參考資料，適用於 MAX1323ECM+ — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | MAX1323ECM+T | MAX1319ECM+ | MAX1319ECM+T | MAX1327ECM+ | LTC1864 |
|---|---|---|---|---|---|---|
| Package | 48-LQFP (7x7 mm) | 48-LQFP (7x7 mm) - same | 48-LQFP (7x7 mm) - same | 48-LQFP (7x7 mm) - same | 48-LQFP (7x7 mm) - same | 48-LQFP (7x7 mm) - same |
| Brand | Maxim Integrated | Maxim Integrated - same | Maxim Integrated - same | Maxim Integrated - same | Maxim Integrated - same | Analog Devices (formerly Linear Technology) - cross-brand |
| Resolution | 14 bit | 14 bit | 14 bit | 14 bit | 14 bit | 12 bit (-2 bit) |
| Number of Input Channels | 1 | 1 | 1 | 1 | 8 (with internal MUX) | 1 |
主要差異化特點
- Integrated 8-channel input multiplexer variant available on same footprint (對比MAX1327ECM+)
- Lower-speed same-family option for cost-sensitive designs (對比MAX1319ECM+)
- Cross-brand pin-compatible footprint for supply chain resilience (對比LTC1864)
設計說明
Place a 0.1 µF X7R ceramic bypass capacitor within 5 mm of the AVDD pin (pin 26) and DVDD pin (pin 16). Add a 10 µF tantalum or low-ESR ceramic bulk capacitor at the supply entry point. The +5V analog and digital supplies should be derived from a common +5 V rail with ferrite-bead isolation if the digital logic is switching heavily. Poor supply decoupling will manifest as elevated code-edge noise and degraded SINAD.
Route the parallel D0-D13 bus traces with controlled impedance and length-matched within ±25 mm to avoid skew-induced read errors at full 526 ksps throughput. Separate the analog ground (AGND, pin 24) and digital ground (DGND, pin 15) planes with a single point connection under the IC. Place the analog input trace away from digital switching nodes to minimize coupled noise into the SAR capacitor network.
Do not apply voltages outside the ±25 V input overvoltage clamp range, or permanent damage to the input ESD structure will occur. When using the internal +2.5 V reference, ensure REF (pin 23) is decoupled with a 1 µF ceramic capacitor to AGND. Do not exceed the specified maximum external clock frequency; the internal RC oscillator is the default and can be left floating. SHDN (pin 22) must be tied low through a 100 kΩ pulldown if the shutdown feature is unused to prevent accidental shutdown during power-up transients.
合規資訊
RoHS compliant per Maxim Integrated product page. Lead-free terminal finish. AEC-Q100 qualification not applicable for industrial temperature grade ADC - this part targets industrial/commercial instrumentation, not automotive. Halogen-free status not explicitly stated in available data.