COP434CN/NOPB - 8-Bit Serial ADC, 4-Ch, DIP-14 | Texas Instruments
MPN： COP434CN/NOPB ✓ 啟用中COP434CN/NOPB 概覽
An ADC (analog-to-digital converter) is a data-conversion integrated circuit that translates a continuous analog input voltage into a discrete digital code. SAR ADCs use a binary-weighted capacitive DAC and a comparator to converge on the input voltage in N conversion cycles, where N is the resolution in bits; the COP434 family is the 8-bit implementation of this architecture. ADCs sit within the broader data-converter hierarchy: data converter -> ADC -> SAR ADC, and they belong to the data-conversion sub-system of mixed-signal ICs, interfacing directly with microcontrollers or FPGAs to digitize sensor signals, voltages, or current loops.
The COP434CN/NOPB features an on-chip sample-and-hold, fixed single-ended input ranges referenced to the supply, and a serial interface that minimizes pin count compared to parallel-output ADCs. It is specified for the commercial 0 to 70 C temperature range and 8 analog input channels (the COP434 part number uses "34" to indicate this 4-to-8-channel family). The die is fabricated on a mature CMOS process that has been in volume production for decades, contributing to the device's longevity and low unit cost in distribution.
Typical applications include digital panel meters, simple data-acquisition front-ends, microcontroller-based sensor reading boards, industrial control and instrumentation, building automation sensor interfaces, and legacy replacement of the older ADC083x series. Because of its wide availability, simple serial protocol, and DIP-14 footprint, the part is favored for breadboarding, hobbyist projects, and through-hole industrial designs where surface-mount assembly lines are not available.
Designers should note that the COP434 family's clock and serial interface require a minimum SCLK frequency for valid conversions and that its input voltage range is single-supply and ratiometric to VCC. Decouple VCC with a 0.1 uF ceramic capacitor placed within 5 mm of the supply pin and keep analog/digital grounds joined at a single star point to avoid conversion noise.
直接替換替代品，適用於 COP434CN/NOPB — 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： COP434CN/NOPB （相同外形與佔位） — 差異在於 Package, Sampling Rate, Mounting Type, Operating Temperature, Resolution.
ADC0834CCN/NOPB
✅ 直接替換📋 參考替代品（不在目錄中）
ADC0834CCN
✅ 直接替換📋 參考替代品（不在目錄中）
ADC0831CCWM
✅ 直接替換聯絡詢價
查看資料表 →ADC0844CCN/NOPB
✅ 直接替換聯絡詢價
查看資料表 →ADC0838CCN/NOPB
✅ 直接替換聯絡詢價
查看資料表 →COP434CN/NOPB 最大額定值與電氣特性
| 解析度 | 8 bits |
| Number of Input Channels | 4 (single-ended, family supports up to 8 channels) |
| Architecture | SAR (Successive Approximation Register) |
| 介面 | Serial (synchronous, MICROWIRE-compatible) |
| 供應電壓 | 5 V nominal |
| 輸入電壓範圍 | 0 V to VCC (ratiometric, single-ended) |
| On-Chip Sample-and-Hold | Yes |
| 工作溫度範圍 | 0 C to +70 C (Commercial) |
| 封裝 | 14-Pin DIP (PDIP), Through-Hole |
| Package Suffix Code | N (PDIP-14), /NOPB suffix = lead-free RoHS |
| Number of Terminals | 14 |
| Terminal Finish | Lead-Free / RoHS Compliant |
| 安裝類型 | Through-Hole |
| RoHS 狀態 | Compliant (/NOPB suffix) |
COP434CN/NOPB 腳位配置
| 腳位 1 | CS — Chip Select (active low) |
| 腳位 2 | CLK — Serial Clock Input |
| 腳位 3 | DI — Data Input (MUX address) |
| 腳位 4 | DO — Serial Data Output |
| 腳位 5 | CH0 — Analog Input Channel 0 |
| 腳位 6 | CH1 — Analog Input Channel 1 |
| 腳位 7 | CH2 — Analog Input Channel 2 |
| 腳位 8 | CH3 — Analog Input Channel 3 |
| 腳位 9 | GND — Ground |
| 腳位 10 | VREF — Voltage Reference Input (tied to VCC for ratiometric operation) |
| 腳位 11 | CH4 — Analog Input Channel 4 (family variant) |
| 腳位 12 | CH5 — Analog Input Channel 5 (family variant) |
| 腳位 13 | CH6 — Analog Input Channel 6 (family variant) |
| 腳位 14 | VCC — +5 V Supply |
典型應用
COP434CN/NOPB 適用於 6 應用s: Digital Panel Meter Front-End, Microcontroller Sensor Interface (Through-Hole), Industrial Control and Instrumentation (Commercial Grade), Legacy ADC0834 Socket Replacement, Educational and Prototyping Boards, Building Automation Sensor Hub.
Digital Panel Meter Front-End
The COP434CN/NOPB is a natural fit for digital panel-meter designs that must digitize a 0-to-5 V analog signal and report it to an LED or LCD display driver. Its 8-bit resolution gives 19.5 mV per LSB on a 5 V supply, adequate for the typical 0.1 V display step required by hand-held multimeters, voltmeter panels, and process-control readouts. The serial MICROWIRE output of the COP434 interfaces directly to a COP-series or PIC-series microcontroller using only CS, CLK, and DO, leaving most microcontroller I/O free for the display driver. Designers typically feed the COP434 input from an external resistor-divider or current-sense amplifier and rely on its ratiometric conversion (1 LSB = VCC / 256) for accurate readings.
推薦
Microcontroller Sensor Interface (Through-Hole)
For DIP-based microcontroller boards reading temperature, light, or position sensors, the COP434CN/NOPB provides a low-cost, easy-to-solder, through-hole digitization stage. With 4 single-ended inputs, the COP434 can read up to four analog sensors (thermistor divider, photodiode, potentiometer wiper, current-sense resistor) and stream them through a 3-wire serial port. The synchronous serial protocol requires no glue logic and runs at moderate clock rates compatible with legacy 8-bit MCUs. This makes the part popular in education labs, hobbyist boards, and DIY instrumentation kits where surface-mount assembly is impractical.
推薦
Industrial Control and Instrumentation (Commercial Grade)
Indoor industrial control panels and building-automation controllers use the COP434CN/NOPB for digitizing analog signals from 4-to-20 mA loops, thermistor bridges, or potentiometer panels. The single 5 V supply is convenient for backplane power rails, and the commercial 0 to +70 C temperature range is sufficient for cabinets located in climate-controlled factory areas. The COP434's on-chip sample-and-hold removes timing concerns at moderate signal bandwidths, and the 8-bit resolution matches the loop accuracy requirement of typical process-control readouts. For harsher environments an industrial-grade variant or a modern 12-bit ADC is recommended.
推薦
Legacy ADC0834 Socket Replacement
The COP434CN/NOPB is the TI-branded active-ordering equivalent of the legacy National Semiconductor ADC0834CCN, making it a direct replacement for older PCB designs. Existing ADC0834 DIP-14 sockets can be solder-stenciled with the COP434CN/NOPB without any layout changes, firmware updates, or BOM changes. The COP434 implements the same SAR core, same serial timing, and same internal multiplexer, so firmware drivers transfer unmodified. This makes the COP434CN/NOPB the recommended active part when repairing or refreshing legacy equipment.
推薦
Educational and Prototyping Boards
Universities, electronics training programs, and hobbyist workbenches commonly use the COP434CN/NOPB in breadboard and through-hole proto-board training exercises for ADC theory. The DIP-14 package and 5 V supply let students wire it up without special tools, while the 4-channel input lets a single experiment demonstrate multiplexer behavior, sampling-rate tradeoffs, and serial-data recovery. Senior design projects, robotics clubs, and maker spaces all benefit from the COP434's low cost, abundant stock, and abundant application notes. Many lab kits specifically choose this part as a teaching reference for SAR ADC principles.
推薦
Building Automation Sensor Hub
Building-automation hubs and energy-monitoring panels can use the COP434CN/NOPB to read a small number of sensors such as ambient light, indoor temperature, occupancy detection threshold, and HVAC damper position. The 4-channel analog input accommodates a typical sensor-cluster while the serial output minimizes the wiring back to a building controller. The DIP-14 through-hole package eases hand-soldering for low-volume custom panels and the 5 V supply integrates with the common 5 V backplane rails found in legacy BAS hardware. Use a TL431 reference for stable excitation when sensor accuracy matters.
推薦
推薦產品摘要
工程參考資料，適用於 COP434CN/NOPB — 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 | ADC0834CCN/NOPB | ADC0834CCN | ADC0838CCN/NOPB | ADC0844CCN/NOPB |
|---|---|---|---|---|---|
| Package | PDIP-14 (Through-Hole) | PDIP-14 - same | PDIP-14 - same | PDIP-14 - same | PDIP-14 - same |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Resolution | 8 bits | 8 bits | 8 bits | 8 bits | 8 bits |
| Number of Input Channels | 4 (family supports 8) | 4 | 4 | 8 | 4 (parallel interface) |
| Interface | Serial (MICROWIRE) | Serial (MICROWIRE) | Serial (MICROWIRE) | Serial (MICROWIRE) | Parallel |
| Supply Voltage | 5 V | 5 V | 5 V | 5 V | 5 V |
| RoHS Status | Compliant (/NOPB) | Compliant (/NOPB) | Non-Compliant (tin-lead) | Compliant (/NOPB) | Compliant (/NOPB) |
| Operating Temperature | 0 C to +70 C | 0 C to +70 C | 0 C to +70 C | 0 C to +70 C | 0 C to +70 C |
主要差異化特點
- TI-branded active marketing part number for legacy ADC0834 sockets (對比ADC0834CCN/NOPB)
- 8-channel option available in same package family (對比ADC0838CCN/NOPB)
- Lead-free /NOPB finish meets RoHS directive (對比ADC0834CCN (tin-lead, no /NOPB suffix))
設計說明
Estimated: at VCC = 5 V the COP434CN/NOPB draws a few mA of supply current. Decouple VCC with a 0.1 uF ceramic capacitor placed within 5 mm of the supply pin and a 10 uF bulk capacitor on the board-level rail. For ratiometric conversions tie VREF to VCC; for absolute readings tie VREF to a TL431-derived 2.5 V or 5 V stable reference. Power-supply noise above ~50 mVrms will degrade last-2-bit accuracy, so keep digital noise away from the analog VCC trace.
The COP434 family requires a minimum SCLK frequency for valid conversions; do not leave CLK static between conversions. Always drive CS low to start a conversion and observe the published tCONV timing window before clocking out data. Input voltages must remain between GND and VCC; negative voltages on any analog input can permanently damage the device. Do not exceed the absolute maximum ratings; transient over-voltage protection should be added if the analog inputs come from external cables or sensors.
Keep analog input traces short and routed away from digital lines, especially the serial clock. Use a single ground plane if possible, otherwise star-ground the AGND and DGND pins at one physical point. Place the 0.1 uF VCC bypass capacitor within 5 mm of the VCC pin. For best ratiometric accuracy, run VREF from the same rail that powers the input sensor or divider so VCC drift cancels between sensor excitation and ADC full-scale.
合規資訊
/NOPB suffix indicates matte-tin (Pb-free) lead finish, RoHS per TI product page. Not AEC-Q100 qualified - commercial temperature grade only. Reach and conflict-minerals compliance from TI product family disclosure. Halogen-free status not stated in provider data.
