ADS574JE - 12-Bit 40kSPS SAR ADC | 28-PDIP | Texas Instruments
MPN： ADS574JE ✓ 啟用中ADS574JE 概覽
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.
直接替換替代品，適用於 ADS574JE — 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： ADS574JE （相同外形與佔位） — 差異在於 Operating Temperature, Package.
ADS574JP
✅ 直接替換聯絡詢價
查看資料表 →ADS574JU
✅ 直接替換📋 參考替代品（不在目錄中）
ADS574KE
✅ 直接替換聯絡詢價
查看資料表 →ADS574JE
✅ 直接替換聯絡詢價
查看資料表 →MX574AJN+
✅ 直接替換📋 參考替代品（不在目錄中）
ADS574JE 最大額定值與電氣特性
| 解析度 | 12 bit |
| Architecture | SAR (Successive Approximation) |
| 取樣率 | 40 kSPS |
| Number of Input Channels | 1 |
| Acquisition and Conversion Time | 25 µs max |
| 供應電壓 | +5 V (single supply) |
| 輸入電壓範圍 | 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) |
| 工作溫度 | 0 °C to +70 °C (commercial, J grade) |
| 封裝 | 28-pin PDIP through-hole |
| Technology | Low-power CMOS with CDAC array |
| 安裝類型 | Through-Hole |
| RoHS 狀態 | Compliant |
| Compatible Legacy Part | Drop-in replacement for ADC574 |
ADS574JE 腳位配置
| 腳位 1 | VIN — Analog input |
| 腳位 2 | AGND — Analog ground |
| 腳位 3 | REF IN — Reference input (10V nominal) |
| 腳位 4 | REF OUT — Internal 10V reference output |
| 腳位 5 | BIPOLAR — Bipolar/unipolar range select |
| 腳位 6 | 10VIN — 10V/20V input range select |
| 腳位 7 | RANGE — Range select logic input |
| 腳位 8 | AGND — Analog ground |
| 腳位 9 | VCC — +5V analog supply |
| 腳位 10 | DB11 (MSB) — Data bit 11 (MSB) |
| 腳位 11 | DB10 — Data bit 10 |
| 腳位 12 | DB9 — Data bit 9 |
| 腳位 13 | DB8 — Data bit 8 |
| 腳位 14 | DB7 — Data bit 7 |
| 腳位 15 | DB6 — Data bit 6 |
| 腳位 16 | DB5 — Data bit 5 |
| 腳位 17 | DB4 — Data bit 4 |
| 腳位 18 | DB3 — Data bit 3 |
| 腳位 19 | DB2 — Data bit 2 |
| 腳位 20 | DB1 — Data bit 1 |
| 腳位 21 | DB0 (LSB) — Data bit 0 (LSB) |
| 腳位 22 | DGND — Digital ground |
| 腳位 23 | CS — Chip select (active low) |
| 腳位 24 | R/C — Read/Convert control |
| 腳位 25 | CE — Chip enable |
| 腳位 26 | VCC — +5V digital supply |
| 腳位 27 | STATUS — Conversion status (active low) |
| 腳位 28 | DGND — Digital ground |
典型應用
ADS574JE 適用於 6 應用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.
推薦
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.
推薦
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.
推薦
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.
推薦
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.
推薦
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.
推薦
推薦產品摘要
工程參考資料，適用於 ADS574JE — 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 | 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.) |
主要差異化特點
- True 28-PDIP drop-in replacement for legacy ADC574 sockets (對比Modern ADS54xx SAR ADCs)
- Industrial (-40 °C to +85 °C) and military (-55 °C to +125 °C) siblings available in same package (對比ADS574JE alone)
- On-chip 10 V reference eliminates external reference components (對比Older bipolar ADC574 designs)
設計說明
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.
合規資訊
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.
