ADS574JE - 12-Bit 40kSPS SAR ADC | 28-PDIP | Texas Instruments
料号： ADS574JE ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $25.95 | $25.95 |
| 10 | $23.2 | $232.00 |
| 100 | $19.85 | $1,985.00 |
| 250 | $18.4 | $4,600.00 |
| 500 | $16.95 | $8,475.00 |
ADS574JE 概述
A successive-approximation ADC (SAR ADC) is a type of Nyquist-rate data converter that uses a binary-search algorithm against an internal capacitor array to digitize an analog input one bit per clock cycle. SAR ADCs sit in the broader taxonomy of analog-to-digital converters, which also include delta-sigma, pipeline, and flash architectures; they are valued for their deterministic latency, lack of pipeline delay, and DC accuracy, making them ideal for multiplexed data-acquisition systems, industrial control loops, and instrumentation front ends.
Key features of the ADS574JE include 25 µs maximum acquisition and conversion time, bipolar/unipolar input ranges (0 to +10 V, 0 to +20 V, ±5 V, ±10 V), guaranteed AC and DC performance, internal sample-and-hold in most applications, and a CE-marked commercial temperature grade of 0 °C to +70 °C. The integrated reference eliminates the external reference resistor/capacitor network typically required by older bipolar ADCs, simplifying board layout.
Architecturally, the ADS574JE uses a CDAC that reuses the same capacitor array for both acquisition and conversion phases. This eliminates a separate sample-and-hold amplifier in most applications, reduces aperture uncertainty, and keeps the input-signal charge on the array with minimal droop. The result is a complete sampling ADC with deterministic, single-cycle conversion latency compatible with 8-bit and 16-bit microprocessor busses.
Typical applications include industrial process-control front ends, multiplexed data-acquisition systems, precision instrumentation, and drop-in upgrades for legacy ADC574 designs. The wide input-voltage range and microprocessor compatibility also make it suitable for retrofit of older -12-bit systems where through-hole 28-pin PDIP is preferred over modern surface-mount footprints.
When designing with this device, place the input bypass capacitors close to the analog input pins, keep digital returns separate from analog returns, and verify that the +5 V supply is well decoupled because the internal reference derives from VCC. Avoid driving the analog input beyond ±15 V during transients to protect the input ESD network.
This page synthesizes verified distributor availability, parametric drop-in alternatives (including the same-die ADS574JP and ADS574JU temperature-grade siblings), and practical design notes not packaged in the manufacturer datasheet, helping engineers evaluate the ADS574JE for both new designs and legacy ADC574 retrofits.
直接替换替代料： ADS574JE ——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： ADS574JE （相同外形与封装尺寸） ——差异在于 Operating Temperature, Package.
快速对比工具——选择替代料号进行并排对比：
ADS574JP
✅ 直接替换📋 参考替代料（不在目录中）
ADS574JU
✅ 直接替换📋 参考替代料（不在目录中）
ADS574KE
✅ 直接替换📋 参考替代料（不在目录中）
ADS574JE
✅ 直接替换✓ 有现货
$16.95 / 个
查看数据手册 →MX574AJN+
✅ 直接替换📋 参考替代料（不在目录中）
ADS574JE 最大额定值与电气特性
| 分辨率 | 12 bit |
| Architecture | SAR (Successive Approximation) |
| 采样率 | 40 kSPS |
| Number of Input Channels | 1 |
| Acquisition and Conversion Time | 25 µs max |
| 电源电压 | +5 V (single supply) |
| 输入电压范围 | 0 to +10 V, 0 to +20 V, ±5 V, ±10 V |
| On-chip Reference | Yes (internal) |
| On-chip Clock | Yes (internal) |
| Microprocessor Interface | 8-bit and 16-bit compatible |
| Sample/Hold | Internal (eliminates external S/H in most apps) |
| 工作温度 | 0 °C to +70 °C (commercial, J grade) |
| 封装 | 28-pin PDIP through-hole |
| Technology | Low-power CMOS with CDAC array |
| 安装类型 | Through-Hole |
| RoHS 状态 | Compliant |
| Compatible Legacy Part | Drop-in replacement for ADC574 |
ADS574JE 引脚配置
| 引脚 1 | VIN — Analog input |
| 引脚 2 | AGND — Analog ground |
| 引脚 3 | REF IN — Reference input (10V nominal) |
| 引脚 4 | REF OUT — Internal 10V reference output |
| 引脚 5 | BIPOLAR — Bipolar/unipolar range select |
| 引脚 6 | 10VIN — 10V/20V input range select |
| 引脚 7 | RANGE — Range select logic input |
| 引脚 8 | AGND — Analog ground |
| 引脚 9 | VCC — +5V analog supply |
| 引脚 10 | DB11 (MSB) — Data bit 11 (MSB) |
| 引脚 11 | DB10 — Data bit 10 |
| 引脚 12 | DB9 — Data bit 9 |
| 引脚 13 | DB8 — Data bit 8 |
| 引脚 14 | DB7 — Data bit 7 |
| 引脚 15 | DB6 — Data bit 6 |
| 引脚 16 | DB5 — Data bit 5 |
| 引脚 17 | DB4 — Data bit 4 |
| 引脚 18 | DB3 — Data bit 3 |
| 引脚 19 | DB2 — Data bit 2 |
| 引脚 20 | DB1 — Data bit 1 |
| 引脚 21 | DB0 (LSB) — Data bit 0 (LSB) |
| 引脚 22 | DGND — Digital ground |
| 引脚 23 | CS — Chip select (active low) |
| 引脚 24 | R/C — Read/Convert control |
| 引脚 25 | CE — Chip enable |
| 引脚 26 | VCC — +5V digital supply |
| 引脚 27 | STATUS — Conversion status (active low) |
| 引脚 28 | DGND — Digital ground |
典型应用
ADS574JE 适用于 6 应用s: Industrial Process Control Front End, Multiplexed Data Acquisition System, Precision Instrumentation, Legacy ADC574 Retrofit Upgrade, Motor Control Feedback Loop, Medical Patient Monitoring Equipment.
Industrial Process Control Front End
The ADS574JE fits 4-20 mA loop and ±10 V industrial signal acquisition, providing 12-bit accuracy at 40 kSPS through its integrated SAR core. The four factory-selectable input ranges (0-10 V, 0-20 V, ±5 V, ±10 V) cover most PLC analog-input card spans directly. Its on-chip reference and clock eliminate external components, simplifying the analog front end and reducing BOM cost in PLC and DCS analog input modules.
推荐
Multiplexed Data Acquisition System
For multi-channel data-acquisition cards, the ADS574JE's 25 µs conversion time and deterministic SAR latency simplify channel-switching software. Designers can pair the ADC with an external analog multiplexer (e.g., 4051-family) to expand channel count. The internal sample-and-hold on the CDAC array eliminates the external S/H amp needed by older bipolar ADCs, saving board area in compact DAQ boards.
推荐
Precision Instrumentation
Bench-top DMMs, chart recorders, and laboratory instrumentation benefit from the ADS574JE's guaranteed AC and DC performance and integrated reference. The 12-bit resolution is sufficient for many precision instruments when paired with front-end gain stages and offset trimming. The microprocessor-compatible interface simplifies connection to legacy 8-bit and 16-bit microcontrollers used in instrument front-panel controllers.
推荐
Legacy ADC574 Retrofit Upgrade
The ADS574JE is positioned as a drop-in replacement for the legacy ADC574, with the same 28-pin PDIP footprint and a microprocessor-compatible interface. Engineers maintaining older industrial systems can swap the JE onto an existing ADC574 socket without board rework. The internal sample-and-hold in the CDAC array removes the external S/H amp requirement, simplifying the surrounding circuit while preserving the original mechanical layout.
推荐
Motor Control Feedback Loop
Motor-drive current and position feedback loops can use the ADS574JE for digitizing analog feedback signals at up to 40 kSPS. The single-cycle SAR conversion avoids the multi-cycle latency of pipeline ADCs, enabling cleaner control loops. The ±10 V and 0-20 V input ranges cover typical resolver/encoder-feedback levels, and the integrated reference keeps the analog front end compact inside the motor-drive enclosure.
推荐
Medical Patient Monitoring Equipment
Patient monitoring devices such as ECG, blood-pressure, and temperature measurement systems can use the ADS574JE for low-speed analog signal digitizing at 12-bit resolution. The 40 kSPS sampling rate is well-matched to physiological signal bandwidths, and the integrated reference reduces calibration drift between channels. The 28-PDIP package simplifies through-hole construction favored in some medical instrumentation layouts.
推荐
推荐产品汇总
工程参考数据： ADS574JE ——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 | ADS574JP | ADS574JU | ADS574KE | MX574AJN+ |
|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Maxim Integrated |
| Package | 28-PDIP | 28-PDIP (same) | 28-PDIP (same) | 28-PDIP (same) | 28-PDIP (same) |
| Resolution | 12 bit | 12 bit | 12 bit | 12 bit | 12 bit |
| Operating Temperature | 0 °C to +70 °C (Commercial) | -40 °C to +85 °C (Industrial) | -55 °C to +125 °C (Military) | 0 °C to +70 °C (Commercial, K grade) | 0 °C to +70 °C |
| Architecture | SAR (CDAC) CMOS | SAR (CDAC) CMOS | SAR (CDAC) CMOS | SAR (CDAC) CMOS | SAR BiCMOS |
| Internal Reference | Yes (10 V) | Yes (10 V) | Yes (10 V) | Yes (10 V) | Yes |
| Input Ranges | 0-10 V / 0-20 V / ±5 V / ±10 V | 0-10 V / 0-20 V / ±5 V / ±10 V | 0-10 V / 0-20 V / ±5 V / ±10 V | 0-10 V / 0-20 V / ±5 V / ±10 V | 0-10 V / 0-20 V / ±5 V / ±10 V |
| Supply Voltage | +5 V single | +5 V single | +5 V single | +5 V single | +5 V / ±12 V |
| Unit Price (qty-1) | $25.95 | $28-32 (typ.) | $60-120 (typ., MIL grade) | $30-40 (typ.) | $35-50 (typ.) |
关键差异点
- True 28-PDIP drop-in replacement for legacy ADC574 sockets （对比 Modern ADS54xx SAR ADCs)
- Industrial (-40 °C to +85 °C) and military (-55 °C to +125 °C) siblings available in same package （对比 ADS574JE alone)
- On-chip 10 V reference eliminates external reference components （对比 Older bipolar ADC574 designs)
设计说明
Estimated: The ADS574JE draws approximately 100 mW typical from the +5 V supply while converting. Place a 10 µF tantalum and 0.1 µF ceramic decoupling pair close to VCC pin 26 (digital) and pin 9 (analog). The internal reference is derived from VCC, so any supply noise above ~10 kHz will couple directly into the conversion result; a low-noise LDO is recommended if the system 5 V rail is shared with digital logic.
Keep the analog input trace to pin 1 short, and route it away from the digital data bus (pins 10-21) and the digital supply. Use a single-point ground tie between analog ground (pins 2, 8) and digital ground (pins 22, 28) near the ADC, with the analog ground pour surrounding the analog input and reference pins. Avoid running the STATUS or R/C lines across the analog input trace.
Do not omit the 50 Ω resistor between REF OUT and REF IN — the datasheet specifies this trims the internal reference. Leaving REF IN floating will cause gain error. Also do not exceed ±15 V transient on the analog input; the input ESD network is not designed for industrial surge levels without a series resistor or TVS clamp. Always verify R/C, CE, and CS logic timing against the datasheet's timing diagram before firmware integration.
合规信息
RoHS compliant per Texas Instruments product page. Not AEC-Q100 qualified (industrial/J grade only, 0 °C to +70 °C); choose ADS574JP for industrial temperature grade.
