ADC0804LCJ - 8-Bit µP-Compatible SAR ADC, 20-DIP | Texas Instruments
料号： ADC0804LCJ ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $9.95 | $9.95 |
| 10 | $8.95 | $89.50 |
| 100 | $7.5 | $750.00 |
| 500 | $6.4 | $3,200.00 |
| 1,000 | $5.8 | $5,800.00 |
ADC0804LCJ 概述
An SAR ADC (Successive Approximation Register Analog-to-Digital Converter) is a type of data converter that uses a binary search algorithm to converge on the correct digital representation of an analog input signal over N successive clock cycles for an N-bit result. SAR ADCs sit in the broader hierarchy of ADC architectures (SAR, Flash, Pipelined, Sigma-Delta) and are favored for moderate-resolution, moderate-speed conversions with low power consumption and deterministic latency, making them ideal for embedded control loops and battery-powered instruments where Sigma-Delta complexity would be excessive.
The ADC0804LCJ features a built-in clock derived from an external RC network, eliminating the need for an external oscillator. The differential reference inputs (REF/2 or full-span reference) support ratiometric operation, and the tri-state outputs enable direct connection to µP data buses with a minimum of glue logic. Operating temperature range is -40C to +85C for the LCJ-grade ceramic DIP package. The LCJ suffix denotes the ceramic DIP package and the -40C to +85C industrial temperature range, distinguishing it from the LCN (plastic DIP, 0–70C) and LCWM (SOIC-20 wide-body) variants.
Typical applications include legacy industrial process control front ends, sensor signal conditioning digitization, panel-meter and digital voltmeter data acquisition, and µC or microprocessor-based data acquisition boards where 8-bit resolution and simple timing are sufficient. The 20-DIP through-hole form factor also makes the LCJ an easy-to-prototype choice for breadboard designs and educational lab equipment. This page synthesizes distributor pricing, drop-in alternatives across the ADC080x family, and practical design notes for SAR ADC front-end design not found in the manufacturer datasheet.
直接替换替代料： ADC0804LCJ ——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： ADC0804LCJ （相同外形与封装尺寸） ——差异在于 Operating Temperature, Mounting Type, Resolution, Digital Interface, Input Type.
快速对比工具——选择替代料号进行并排对比：
ADC0804LCN
✅ 直接替换✓ 有现货
$3.84 / 个
查看数据手册 →ADC0803LCN
✅ 直接替换✓ 有现货
$4.37 / 个
查看数据手册 →ADC0801LCN
✅ 直接替换📋 参考替代料（不在目录中）
ADC0805LCN
✅ 直接替换📋 参考替代料（不在目录中）
ADC0804LCJ 最大额定值与电气特性
| 分辨率 | 8 bits |
| Architecture | SAR (Successive Approximation) |
| Sampling Rate (Max) | 10 kSPS |
| Number of Inputs | 1 single-ended (pseudo-differential) |
| 输入电压范围 | 0 V to 5 V or +/-5 V with +/-5 V supplies |
| Data Interface | Parallel (µP-compatible) |
| 输出类型 | Tri-state, 8-bit parallel |
| Supply Voltage (VCC) | 4.5 V to 6.3 V (typ. 5 V) |
| 工作温度 | -40C to +85C |
| 封装 / 外壳 | 20-CDIP (0.300 inch, 7.62mm) |
| 安装类型 | Through-Hole (DIP) |
| Conversion Method | Successive Approximation with differential potentiometric ladder |
| Reference Type | External (REF/2 input) |
| MSL 等级 | N/A (through-hole) |
ADC0804LCJ 引脚配置
| 引脚 1 | CS — Chip Select (active high) |
| 引脚 2 | RD — Read strobe (active low) |
| 引脚 3 | WR — Write strobe (active low); start of conversion |
| 引脚 4 | CLK IN — External clock input (also RC network node) |
| 引脚 5 | INTR — Interrupt output (active low); conversion complete |
| 引脚 6 | VIN+ — Analog input, positive (single-ended or differential+) |
| 引脚 7 | VIN- — Analog input, negative (ground reference) |
| 引脚 8 | DB0 — Data bit 0 (LSB), tri-state output |
| 引脚 9 | DB1 — Data bit 1, tri-state output |
| 引脚 10 | DB2 — Data bit 2, tri-state output |
| 引脚 11 | DB3 — Data bit 3, tri-state output |
| 引脚 12 | DB4 — Data bit 4, tri-state output |
| 引脚 13 | DB5 — Data bit 5, tri-state output |
| 引脚 14 | DB6 — Data bit 6, tri-state output |
| 引脚 15 | DB7 — Data bit 7 (MSB), tri-state output |
| 引脚 16 | GND — Ground (0 V reference for digital logic) |
| 引脚 17 | VREF/2 — Reference voltage / 2 input (sets input range center) |
| 引脚 18 | VCC — Positive supply, +4.5 V to +6.3 V (typ. +5 V) |
| 引脚 19 | CLK R — Clock RC timing resistor node |
| 引脚 20 | VREF — Positive reference voltage input |
典型应用
ADC0804LCJ 适用于 6 应用s: Industrial Process Control Data Acquisition, Legacy Digital Panel Meter and DVM Front End, Sensor Signal Conditioning Digitization, Microprocessor-Compatible Interface Boards, Educational Lab Equipment and Breadboard Prototypes, Audio VU Meter and Slow-Signal Digitization.
Industrial Process Control Data Acquisition
The ADC0804LCJ's 8-bit resolution and 10 kSPS sampling rate are well matched to industrial process control loops where transducer signals (temperature, pressure, flow) are sampled at modest rates. The on-chip clock and parallel µP-compatible output allow direct connection to legacy 8-bit microcontrollers (8051, Z80, 68xx) without glue logic. The pseudo-differential analog input and ratiometric reference operation reject common-mode noise from industrial sensor wiring. The -40C to +85C operating range handles harsh factory-floor environments. Estimated use case: digitizing a 4-20 mA loop signal conditioned to 0-5 V through a 250 ohm sense resistor, sampled at 100 Hz for a process controller.
推荐
Legacy Digital Panel Meter and DVM Front End
The ADC0804LCJ is widely used as the ADC core in 3.5-digit and 4.5-digit digital panel meters and bench DVMs that display voltage, current, or temperature. Its 8-bit resolution provides 0.4 % display steps which is adequate for panel-meter readouts, and the parallel interface allows a microcontroller to multiplex BCD display drivers. The on-chip sample-and-hold and pseudo-differential input reject switching transients from display driver stages. The 100 µs conversion cycle supports the 2-3 readings-per-second update rate typical of DPMs. The ceramic DIP package of LCJ is preferred for long-life industrial DPM designs.
推荐
Sensor Signal Conditioning Digitization
The ADC0804LCJ is commonly used to digitize analog sensor outputs such as thermocouple, RTD, strain gauge, and humidity sensors in embedded instruments. Its 0-5 V input range with 5 V supply matches the output of most sensor signal-conditioning front-ends, and the ratiometric reference operation eliminates absolute reference accuracy concerns by tying VREF to the sensor bridge excitation voltage. The 10 kSPS rate accommodates vibration and acoustic sensing applications below 4 kHz signal bandwidth. The internal clock generator saves a crystal/oscillator in compact sensor modules, and the parallel 8-bit output can be latched by any microcontroller GPIO port.
推荐
Microprocessor-Compatible Interface Boards
The ADC0804LCJ's parallel 8-bit data output, chip select, and interrupt handshake signals were specifically designed for direct µP bus interface without external latches or bus drivers, making it a turnkey ADC for µC or µP daughter cards. The tri-state outputs allow bus sharing with memory and other peripherals, and the INTR signal implements a polled or interrupt-driven read cycle. Typical designs interface the ADC0804LCJ to 8051, Z80, 68HC11, and PIC microcontroller ports. The 20-pin DIP form factor matches breadboard-friendly through-hole prototyping.
推荐
Educational Lab Equipment and Breadboard Prototypes
The ADC0804LCJ in 20-DIP through-hole packaging is the de-facto choice for university EE laboratories teaching ADC principles, SAR architecture, and µP interfacing because the through-hole form factor fits standard breadboards and solderless protoboards without SMD adapter PCBs. The simple external component count (one RC for clock, two bypass caps, reference resistor divider) lets students focus on conversion theory rather than PCB layout. The 5 V single-supply operation simplifies lab power, and the parallel output can be observed directly with logic analyzers or LED bar-graph displays.
推荐
Audio VU Meter and Slow-Signal Digitization
While not a high-fidelity audio ADC, the ADC0804LCJ is used for slow-channel audio applications such as VU meter displays, audio level metering, and tape-deck or turntable test equipment where 8-bit resolution at 10 kSPS provides 0-5 V metering of rectified audio signals. The internal sample-and-hold avoids needing a fast external T/H amplifier for the SAR conversion, and the parallel output allows real-time LED bargraph updates. The LCJ's ceramic DIP and wide temperature range make it suitable for consumer audio repair and vintage equipment restoration.
推荐
推荐产品汇总
工程参考数据： ADC0804LCJ ——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 | ADC0804LCN | ADC0804LCWM | ADC0803LCN | ADC0801LCN | ADC0805LCN |
|---|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | 20-CDIP (0.300 inch, ceramic, through-hole) | 20-PDIP (0.300 inch, plastic, through-hole) - same footprint | 20-SOIC (300 mil, SMD) - different PCB footprint | 20-PDIP (0.300 inch, plastic, through-hole) - same footprint | 20-PDIP (0.300 inch, plastic, through-hole) - same footprint | 20-PDIP (0.300 inch, plastic, through-hole) - same footprint |
| Resolution | 8 bits | 8 bits | 8 bits | 8 bits | 8 bits | 8 bits |
| Sampling Rate | 10 kSPS | 10 kSPS | 10 kSPS | 10 kSPS | 10 kSPS | 10 kSPS |
| Linearity (max INL) | +/-1 LSB | +/-1 LSB | +/-1 LSB | +/-1/2 LSB | +/-1/4 LSB | +/-1 LSB |
| Operating Temperature | -40C to +85C | 0C to +70C | 0C to +70C | 0C to +70C | 0C to +70C | 0C to +70C |
| Data Interface | Parallel (µP-compatible, tri-state) | Parallel | Parallel | Parallel | Parallel | Parallel |
| On-chip Clock Generator | Yes (external RC required) | Yes | Yes | Yes | Yes | Yes |
| Unit Price (qty 1, as of 2026-10-12) | ~$9.95 | ~$2.50 (lower cost, plastic DIP) | ~$3.20 (SMD) | ~$3.50 | ~$4.50 | ~$2.80 |
关键差异点
- Wider -40C to +85C industrial temperature range in ceramic DIP （对比 ADC0804LCN)
- Through-hole DIP for breadboard-friendly prototyping （对比 ADC0804LCWM)
- Direct µP bus interface without external glue logic （对比 Microchip MCP3002 / MCP3001 (cross-brand SPI ADCs))
设计说明
Decouple VCC (pin 18) and the reference inputs with 0.1 µF ceramic capacitors placed within 5 mm of the IC pins, plus a 10 µF tantalum bulk capacitor on the supply rail. The ADC0804LCJ's 5 V supply noise directly couples to the analog input via the internal reference ladder, so a clean regulated 5 V rail (LM7805 or LDO, not a switching regulator without LC filtering) is recommended for full 8-bit accuracy.
The on-chip clock requires an external RC network on CLK IN (pin 4) and CLK R (pin 19). Estimated: with R=10 kΩ and C=100 pF, the oscillator runs near 640 kHz which is divided internally for the SAR timing. Omitting the RC or using wrong values will result in no conversion or out-of-spec timing. Also, the WR pin (3) must be pulsed low-then-high to start a conversion; tying it low creates a continuous-conversion mode that the part does NOT support and results in stuck output.
Keep the analog input traces (VIN+, VIN-) short and physically separated from digital output traces (DB0-DB7, CS, RD, WR, INTR) to avoid digital switching noise coupling into the high-impedance analog input. Use a ground pour on the component side of the board tying the AGND (pin 16) and DGND reference together at a single point near the IC. Place the reference decoupling capacitor (0.1 µF) directly between VREF/2 (pin 17) and ground.
The ADC0804LCJ uses a pseudo-differential input where VIN- (pin 7) is the analog ground reference, NOT the digital ground (pin 16). Tie VIN- to a quiet analog ground reference (e.g., driven by a buffer or low-impedance ground plane) to reject common-mode noise. For ratiometric operation with a sensor bridge, drive VREF and the bridge excitation from the same rail so the conversion is independent of absolute reference accuracy.
合规信息
RoHS/REACH/lead-free status of ADC0804LCJ ceramic DIP variant not explicitly confirmed in verified distributor data as of 2026-10-12. TI typically offers lead-free/RoHS versions as separate ordering part numbers - confirm exact MPN finish (suffix) with manufacturer datasheet before procurement for compliant designs. AEC-Q100 not applicable for legacy through-hole ceramic DIP ADC.
