MAX121CPE+ - 14-Bit 308ksps ADC | Analog Devices
MPN： MAX121CPE+ ✓ 啟用中MAX121CPE+ 概覽
An ADC is a data-conversion IC that converts an analog voltage into a numeric value for processing by a microcontroller, DSP, or other digital system. The MAX121 belongs to the broader analog-to-digital converter hierarchy, where a sampling ADC samples an input waveform and reports a digital code representing its voltage. Its serial output reduces the number of signal connections required compared with a parallel-output converter, making the device suitable for compact instrumentation systems.
Key features include a 14-bit conversion resolution, a maximum throughput rate of 308ksps, and 78dB signal-to-noise-plus-distortion performance. The integrated track-and-hold circuit supports direct acquisition of rapidly changing analog signals, while the on-chip buried-zener reference reduces the need for an external precision reference. Compatible clocking from 1.1MHz to 5.5MHz allows the conversion rate to be matched to the host processor and system timing requirements.
The MAX121 uses a BiCMOS implementation and a serial-output architecture intended for direct connection to popular digital signal processors. Its logic inputs and outputs are compatible with TTL and CMOS systems, which simplifies interfacing with legacy DSP and embedded-control equipment. The specified 4.75V operating value, low-noise reference, and 14-bit resolution are particularly useful when accurate measurement must be performed with a modest number of external components.
Typical applications include industrial process measurement, laboratory data acquisition, instrumentation, control systems, and embedded DSP modules. The 308ksps throughput is suitable for sampled sensors and supervisory control channels, while 78dB SINAD supports measurements requiring substantially more precision than an 8-bit converter. The serial interface also reduces PCB trace count compared with a parallel ADC when board space is constrained.
Designers should provide the supply and reference bypassing specified by the manufacturer datasheet and keep analog input routing away from high-current digital clock and interface traces. Because the MAX121CPE+ uses a through-hole 16-pin DIP package, it is appropriate for legacy boards, prototype systems, and manually serviced industrial equipment, but it requires more PCB area than a surface-mount alternative.
This page consolidates verified manufacturer and distributor details, distinguishes the available same-family temperature-grade alternatives, and adds practical selection and interface guidance. It does not infer prices, pin assignments, or compliance claims that are absent from the supplied verified data.
直接替換替代品，適用於 MAX121CPE+ — 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： MAX121CPE+ （相同外形與佔位） — 差異在於 Architecture, Interface, Logic Compatibility, Package, Pin Count.
MAX121EPE+
✅ 直接替換📋 參考替代品（不在目錄中）
MAX121CJE+
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
MAX121EJE+
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
MAX121CPE+ 最大額定值與電氣特性
| ADC Type | Successive-approximation sampling ADC |
| 解析度 | 14 bit |
| Maximum Conversion Rate | 308ksps |
| SINAD | 78dB |
| Input Channel Count | 1 channel |
| Input Polarity | Single-ended with dual-polarity capability |
| 介面 | Serial DSP interface |
| Architecture | BiCMOS |
| Sample-and-Hold | On-chip track-and-hold |
| Internal Reference | On-chip low-drift, low-noise buried-zener reference |
| Operating Supply Value | 4.75 V |
| Clock Frequency Range | 1.1MHz to 5.5MHz |
| Logic Compatibility | TTL- and CMOS-compatible |
| 封裝 | DIP-16, through-hole |
| Temperature Grade | Commercial |
| 腳位數 | 16 pins |
MAX121CPE+ dip-16, through-hole 腳位配置指南
MAX121CPE+（dip-16, through-hole 封裝）的腳位配置。 此類比元件具有輸入、輸出與電源腳位。偏移歸零、補償與致能腳位配置請參閱製造商資料表。適用於訊號調理與放大器電路。
無詳細腳位定義資料： MAX121CPE+.
請參閱 資料表 以查看完整腳位配置。
典型應用
MAX121CPE+ 適用於 6 應用s: Industrial Process Instrumentation, Laboratory Data Acquisition, Digital Signal Processor Front End, Embedded Sensor Conditioning, Legacy Control System Upgrade, Automated Test Equipment.
Industrial Process Instrumentation
The MAX121CPE+ fits industrial process measurement because it combines 14-bit resolution with a maximum conversion rate of 308ksps and 78dB SINAD. It can acquire a conditioned pressure, temperature, or position signal and deliver the result through its serial DSP interface to a controller. The integrated track-and-hold and buried-zener reference simplify analog front-end design. For installations with extended-temperature requirements, MAX121EPE+ may be more appropriate after checking the manufacturer’s grade limits.
推薦
Laboratory Data Acquisition
For laboratory data-acquisition systems, the MAX121CPE+ offers 14-bit resolution, 308ksps throughput, and a serial interface that reduces the number of PCB connections. Its TTL- and CMOS-compatible logic can operate with clocks from 1.1MHz to 5.5MHz, allowing acquisition timing to be coordinated with DSP-based signal processing. The on-chip track-and-hold and low-noise buried-zener reference also help establish a repeatable measurement baseline without requiring a complete external reference subsystem.
推薦
Digital Signal Processor Front End
The MAX121CPE+ is well suited to a DSP front end because its serial output can connect directly to the serial port of popular digital signal processors. The 14-bit conversion format and 308ksps maximum sampling rate provide useful throughput for waveform and control-signal analysis, while the 1.1MHz-to-5.5MHz clock range supports flexible timing. System designers should still account for serial framing latency and use controlled clock and data routing to prevent digital coupling from degrading the 78dB SINAD performance.
推薦
Embedded Sensor Conditioning
The MAX121CPE+ can digitize outputs from conditioned sensor channels where 8-bit resolution is insufficient but very-high-rate acquisition is unnecessary. A 308ksps ceiling, 14-bit resolution, and 78dB SINAD preserve useful detail across the operating range, while the integrated track-and-hold and voltage reference reduce the analog component count. Designers should condition the sensor output to the ADC’s permitted input range and isolate high-current switching nodes from the analog input path.
推薦
Legacy Control System Upgrade
The MAX121CPE+ can modernize an older through-hole control board that needs higher measurement resolution without requiring a surface-mount redesign. Its 16-pin DIP format is compatible with legacy fabrication and service practices, while the 14-bit ADC provides more than twice the code depth of an 8-bit converter. The serial output reduces interface wiring compared with a parallel ADC. Because this package occupies more board area, it is best suited to existing DIP layouts and expansion boards rather than new compact products.
推薦
Automated Test Equipment
The MAX121CPE+ is applicable to automated test equipment that converts conditioned DUT or sensor signals for analysis. A 14-bit, 308ksps ADC with 78dB SINAD provides enough speed and fidelity for supervisory measurement channels, while TTL- and CMOS-compatible logic supports legacy test-system interconnections. The internal track-and-hold and buried-zener reference simplify per-channel implementation. For a shared analog reference or unusually low-noise measurement, the complete manufacturer electrical data should be reviewed before standardizing the device.
推薦
推薦產品摘要
工程參考資料，適用於 MAX121CPE+ — 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 | MAX121EPE+ | MAX121CJE+ | MAX121EJE+ |
|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Package | DIP-16 | DIP-16 | DIP-16 | DIP-16 |
| Resolution | 14 bit | 14 bit | 14 bit | 14 bit |
| Maximum Conversion Rate | 308ksps | 308ksps | 308ksps | 308ksps |
| SINAD | 78dB | 78dB | 78dB | 78dB |
| Interface | Serial DSP interface | Serial DSP interface | Serial DSP interface | Serial DSP interface |
| Clock Frequency Range | 1.1MHz to 5.5MHz | 1.1MHz to 5.5MHz | 1.1MHz to 5.5MHz | 1.1MHz to 5.5MHz |
| Temperature Grade | Commercial | Extended | Commercial | Extended |
主要差異化特點
- Integrated high-resolution acquisition chain (對比MAX121EPE+)
- Commercial-temperature option for standard environments (對比MAX121EPE+)
- Through-hole package preserves legacy PCB compatibility (對比MAX121CJE+)
設計說明
Route the analog input directly to the MAX121CPE+ and keep it away from clock, serial-data, and supply-return paths carrying fast transitions. The serial interface reduces trace count, but its clock line can still couple into the input when the wiring is long. Use a compact analog return path, place required bypassing at the device pins according to the manufacturer layout, and avoid routing the input beneath digital clock lines. Validate the completed layout with an oscilloscope because PCB leakage and switching noise may not appear in a static simulation.
Design the supply path around the verified 4.75V operating value while consulting the official datasheet for the complete input range, current consumption, and absolute maximum ratings. Because the MAX121CPE+ includes an on-chip buried-zener reference, its reference behavior and supply decoupling requirements should be followed exactly rather than assuming a generic ADC bypass arrangement. The supplied excerpts do not provide verified current or capacitor values, so no numerical capacitor recommendation is asserted here.
Do not treat 4.75V as an unqualified absolute maximum or guarantee operation above it without checking the official MAX121 datasheet. Also verify the clock range of 1.1MHz to 5.5MHz, the serial-interface timing, and the exact numbered pin configuration before replacing an installed device. The commercial MAX121CPE+ should not be assumed to satisfy an extended-temperature requirement; use MAX121EPE+ only after comparing the documented temperature limits with the enclosure requirement.
Clock and serial-data signals should have controlled impedance and a continuous return path to reduce ringing and data errors at the upper 5.5MHz clock limit. Keep switching-node current loops compact and avoid sharing narrow analog and digital return paths. Because the device provides 78dB SINAD, layout-induced noise can consume a meaningful portion of the available signal-to-noise performance. Use probe-point access for observing the input, clock, and serial output during bring-up, while respecting the manufacturer's grounding and test recommendations.
合規資訊
The supplied verified excerpts do not state RoHS, REACH, lead-free, halogen-free, or conflict-minerals status. Compliance fields are therefore marked unknown rather than inferred from the orderable suffix.
