ADS8324EB/250G4 - 14-Bit 50kSPS ADC 1.8V | Texas Instruments
部品番号: ADS8324EB/250G4 ✓ 生産中| 数量 | 単価 | 小計 |
|---|---|---|
| 1 | $8.49 | $8.49 |
| 10 | $7.64 | $76.40 |
| 100 | $6.79 | $679.00 |
| 500 | $6.11 | $3,055.00 |
| 1,000 | $5.44 | $5,440.00 |
ADS8324EB/250G4 概要
An ADC (analog-to-digital converter) is a mixed-signal integrated circuit that converts real-world analog voltages into discrete digital codes, sitting within the data-converter hierarchy of signal chain ICs (sensor -> amplifier -> ADC -> digital processor). Successive-approximation-register (SAR) ADCs like the ADS8324 achieve deterministic latency, low power, and high DC accuracy - ideal for multiplexed low-frequency precision measurements where battery life and small board area matter as much as raw speed.
Key specifications include 14-bit resolution with no missing codes, 50 kSPS maximum throughput, 1.8 V single-supply operation, a 3-microamp maximum power-down current, and a 2.7 mA typical active current. The bipolar differential input accepts input ranges up to ±VREF, where the internal reference supports 500 mV to VCC/2. The serial interface uses an external clock for SAR conversions and outputs MSB-first data with a 2-state flag bit.
Architecturally, the converter combines a charge-redistribution SAR core with an internal reference buffer, auto-power-down between conversions, and a daisy-chainable serial output. The device's 1.8 V supply and 3-microamp power-down current make it a benchmark for battery-powered precision instrumentation where every microwatt of quiescent draw matters.
Typical applications include portable and battery-operated data loggers, remote sensor modules, isolated data acquisition front-ends, simultaneous multi-channel systems, handheld instrumentation, and GPS accessory modules. Its pin-compatibility with the ADS7817 family allows drop-in upgrade of legacy 12-bit designs to 14-bit resolution without PCB rework.
When designing with the ADS8324, decouple VCC with a 0.1 µF ceramic capacitor placed within 5 mm of the supply pin and provide a 10 µF bulk capacitor on the reference pin. The CONVST signal must be clean; route DCLK and DOUT as 50-ohm-controlled traces and ensure the CS/DOUT timing satisfies the t_CNV and t_CK specifications.
This page synthesizes distributor pricing, drop-in pin-compatible alternatives, and practical design notes that complement the manufacturer datasheet for engineers evaluating the ADS8324EB/250G4 for new designs or as a second-source qualification candidate.
ドロップイン代替品: ADS8324EB/250G4 — 同一パッケージでピン互換。PCBの作り直しが必要な異なるパッケージの部品は除外されています。
このシリーズのバリエーション
同一シリーズでドロップイン互換のモデル: ADS8324EB/250G4 （同一形状・フットプリント） — 相違点: Package, Architecture, Resolution, Mounting Type, RoHS Status.
クイック比較ツール — 並列比較する代替部品を選択:
ADS8324E/250G4
✅ ドロップイン📋 参考代替品（カタログ未掲載）
ADS7817UBG4
✅ ドロップイン✓ 在庫あり
$7.77 / 個
データシートを見る →ADS7817UB/1KG4
✅ ドロップイン ⚠️ 仕様未検証📋 参考代替品（カタログ未掲載）
ADS7813PG4
✅ ドロップイン ⚠️ 仕様未検証✓ 在庫あり
$18.75 / 個
データシートを見る →ADS7822PBG4
✅ ドロップイン ⚠️ 仕様未検証✓ 在庫あり
$2.1 / 個
データシートを見る →ADS8324EB/250G4 最大定格＆電気的特性
| 分解能 | 14 bits |
| サンプリングレート | 50 kSPS |
| 電源電圧 | 1.8 V typical (1.8 V to 3.6 V range) |
| Supply Current (Active) | 2.7 mA typical at 50 kSPS |
| Power-Down Current | 3 µA maximum |
| Input Type | Differential, bipolar |
| 入力電圧範囲 | 0 V to VREF (per input, differential ±VREF) |
| Internal Reference | 500 mV to VCC/2, programmable |
| インターフェース | Synchronous serial (SPI/SSI compatible) |
| Architecture | Successive Approximation Register (SAR) |
| Number of Channels | 1 |
| パッケージ | 8-pin MSOP (PowerPAD) |
| 動作温度範囲 | -40 °C to +85 °C |
| Pin Compatibility | ADS7817 family |
| RoHS ステータス | Compliant (G4 = green/RoHS-compliant) |
ADS8324EB/250G4 ピン構成
| ピン 1 | +IN — Non-inverting analog input |
| ピン 2 | -IN — Inverting analog input (differential pair) |
| ピン 3 | VREF — Reference voltage input/output (500 mV to VCC/2) |
| ピン 4 | AGND — Analog ground |
| ピン 5 | VCC — 1.8 V to 3.6 V supply input |
| ピン 6 | /CS — Chip select, active low |
| ピン 7 | DCLK — External serial data clock |
| ピン 8 | DOUT — Serial data output |
主な用途
ADS8324EB/250G4 の用途: 6 件s: Portable Battery-Operated Data Loggers, Remote Sensor Modules / Wireless Sensor Nodes, Isolated Data Acquisition Modules, Simultaneous Multi-Channel Systems, Handheld Test & Measurement Instrumentation, GPS Accessory and Asset Tracker Modules.
Portable Battery-Operated Data Loggers
The ADS8324EB/250G4's 1.8 V operation and 3 µA maximum power-down current make it ideal for battery-powered multi-channel data loggers that must operate for months on a single coin cell or 2xAA pack. Its 14-bit no-missing-codes resolution and integrated reference keep the analog front-end simple - just buffer the sensor, add a 0.1 µF VCC bypass cap, and let the auto-power-down feature gate active current between timed conversions. Designers benefit from SAR deterministic latency, which removes pipeline-delay surprises in event-triggered logging, and the synchronous SPI/SSI interface directly connects to MSP430, Cortex-M0+, or PIC microcontrollers without level shifters.
おすすめ
Remote Sensor Modules / Wireless Sensor Nodes
In remote wireless sensor nodes (Zigbee, LoRa, BLE) the ADS8324EB/250G4 serves as a precision front-end that draws less than 3 µA between conversions, preserving the 5-to-10-year battery life targets of metering and environmental nodes. The 14-bit resolution and differential ±VREF input allow direct connection to bridge sensors (load cells, strain gauges, pressure transducers) without external instrumentation amplifiers, while the synchronous SPI/SSI output easily feeds a sub-GHz radio SoC. The 1.8 V supply rail aligns directly with the radio MCU I/O, eliminating the need for level translation and shrinking the BOM.
おすすめ
Isolated Data Acquisition Modules
Industrial isolated 4-20 mA / 0-10 V acquisition modules benefit from the ADS8324's 1.8 V low-power operation, which keeps the entire ADC below the 3.5 mA budget of a 4-20 mA current loop when idle. The 14-bit no-missing-codes performance and differential bipolar input directly digitize ±10 V or 4-20 mA sense-resistor signals after a simple resistive attenuator, while the synchronous serial interface can be transformer- or digital-isolator-coupled to a host controller for safety-isolated measurement channels. Designers often pair it with digital isolators such as ISO7741 to maintain 5 kV isolation across the analog-digital boundary.
おすすめ
Simultaneous Multi-Channel Systems
The ADS8324EB/250G4 fits simultaneous multi-channel systems when used in an array of synchronized front-ends, each sampling one transducer under a common CONVST signal. Its SAR architecture delivers deterministic acquisition-to-output latency, eliminating the skew artifacts of pipeline ADCs in multichannel phase-coherent measurements such as power-quality analyzers, three-phase energy meters, and multi-axis vibration analyzers. The synchronous serial output allows multiple ADS8324 devices to be daisy-chained on a single SPI bus, saving microcontroller pins and routing space.
おすすめ
Handheld Test & Measurement Instrumentation
The ADS8324EB/250G4 is a strong fit for handheld DMMs, portable oscilloscope front-ends, and field calibration tools where every microamp of quiescent current matters. Its 14-bit no-missing-codes accuracy and 50 kSPS throughput support precision DC measurements (volts, amps, temperature via RTD/thermocouple) at 1.8 V, and the internal reference trims out the need for a precision external reference on cost-sensitive designs. The MSOP-8 (PowerPAD) package with exposed pad keeps the junction-to-ambient thermal resistance low, helping the part survive the elevated ambient temperatures inside sealed handheld enclosures.
おすすめ
GPS Accessory and Asset Tracker Modules
GPS accessory dongles and asset tracker modules benefit from the ADS8324's 1.8 V operation (matching the GPS receiver's I/O rail) and its 3 µA power-down current, which preserves standby battery life between position fixes. Designers can digitize a 3-axis accelerometer, thermistor, and battery monitor through the differential inputs with one 14-bit ADC, then return to sleep until the next fix. The small MSOP-8 (PowerPAD) footprint and minimal external component count keep the dongle's PCB area under 100 mm².
おすすめ
おすすめ製品の概要
エンジニアリング参考データ: ADS8324EB/250G4 — 比較、設計ガイダンス、コンプライアンス情報。
選定ガイド
代替品との比較
| パラメータ | この製品 | ADS8324E/250G4 | ADS7817UBG4 | ADS7817UB/1KG4 | ADS7813PG4 | ADS7822PBG4 |
|---|---|---|---|---|---|---|
| Package | 8-MSOP (PowerPAD) | 8-MSOP (PowerPAD) - same | 8-MSOP - same | 8-MSOP - same | 8-MSOP - same | 8-MSOP - same |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Resolution | 14 bits | 14 bits | 12 bits (-2 bits) | 12 bits (-2 bits) | 12 bits (-2 bits) | 12 bits (-2 bits) |
| Sampling Rate | 50 kSPS | 50 kSPS | 200 kSPS (+300%) | 200 kSPS (+300%) | 40 kSPS (-20%) | 200 kSPS (+300%) |
| Supply Voltage | 1.8 V to 3.6 V | 1.8 V to 3.6 V | 5 V single | 5 V single | 5 V single | 5 V single |
| Internal Reference | Yes (500 mV to VCC/2) | No (external required) | Yes | Yes | Yes | Yes |
| Input Configuration | Differential, bipolar | Differential, bipolar | Single-ended, unipolar | Single-ended, unipolar | Single-ended, unipolar | Single-ended, unipolar |
| Pin-to-Pin Compatible | Yes (ADS7817 family) | Yes | Yes | Yes | Yes | Yes |
主な差別化要因
- Lower minimum supply voltage (1.8 V) vs 5 V predecessors （vs ADS7817UBG4)
- Differential bipolar input vs single-ended unipolar （vs ADS7817UBG4)
- Internal programmable reference included （vs ADS8324E/250G4)
設計ノート
Estimated: at 1.8 V supply and 50 kSPS continuous sampling, the ADS8324 draws about 2.7 mA active (4.9 mW). In a 4-20 mA loop application the device budget must remain under 3.5 mA total, so cycle the CS pin to enter power-down between conversions and gate conversions on a low-duty-cycle timer. Place a 0.1 µF X7R ceramic bypass within 5 mm of the VCC pin and add a 10 µF bulk on VREF to suppress charge-injection noise during the internal reference buffer turn-on transient.
The MSOP-8 (PowerPAD) package has an exposed thermal pad on the underside that must be soldered to a copper pour of at least 25 mm² on the top layer, with thermal vias stitching to the ground plane, to keep the junction-to-ambient thermal resistance (theta_JA) below 150 °C/W. Route the analog input traces (+IN, -IN, VREF) as a differential pair with a ground keepout, and isolate the digital lines (DCLK, DOUT, /CS) on the opposite side of the package to minimize digital kickback into the analog front-end.
The synchronous SPI/SSI interface is sensitive to DCLK edge jitter and to capacitive loading on DOUT; clamp the bus capacitance below 25 pF total (including trace plus MCU pin) and use a 4.7 kΩ pull-up on /CS if the host leaves the line floating during power-up. The CONVST-to-data-ready timing is governed by t_CNV in the datasheet; in daisy-chain applications ensure the DCLK frequency is reduced below f_CK max when several devices are cascaded to avoid read-back overrun.
Do not apply an input voltage that exceeds VCC + 0.3 V on +IN or -IN, even when the device is in power-down; the input ESD diodes will forward-bias and inject charge into the reference, corrupting the next conversion. The internal reference is not stable below VCC = 2.0 V; if you operate at 1.8 V, either force the reference voltage to VCC/2 = 0.9 V via the appropriate bit in the reference register, or supply an external 2.5 V reference and tie VCC to 3.3 V to avoid VREF sag.
コンプライアンス情報
G4 suffix confirms green/RoHS-compliant lead-free MSL1 packaging per TI product page. Not AEC-Q100 qualified; for automotive-grade SAR ADCs consider ADS131A04-Q1 instead.
