TSA7887BRZ-REEL - 12-Bit 125kSPS 2-CH SAR ADC | Silicon Labs
Артикул: TSA7887BRZ-REEL ✓ Активен| Кол-во | Цена за ед. | Итого |
|---|---|---|
| 1 | $4.2 | $4,20 |
| 10 | $3.78 | $37,80 |
| 100 | $3.25 | $325,00 |
| 500 | $2.78 | $1.390,00 |
| 1.000 | $2.4 | $2.400,00 |
TSA7887BRZ-REEL Обзор
A successive-approximation-register ADC (SAR ADC) is a type of data converter that resolves an analog input to a digital output by performing a binary search through an internal capacitive DAC, one bit per conversion clock cycle. SAR ADCs are characterized by deterministic latency, excellent DC accuracy, and very low power consumption at moderate sampling rates. Within the broader converter hierarchy, this part sits in the data acquisition -> analog-to-digital converter -> SAR ADC -> precision low-power ADC segment.
Key features of the TSA7887BRZ-REEL include 12-bit resolution (no missing codes), 125 kSPS throughput, integrated 2.5 V reference, single-supply 2.7 V to 5.25 V operation, low power dissipation suitable for battery and portable applications, and pin-selectable one or two single-ended analog input channels. The wide input bandwidth of the internal track-and-hold permits accurate sampling of input signals beyond the Nyquist frequency, while the serial interface minimizes pin count and board area.
Architecturally, the TSA7887BRZ-REEL is a functional second-source for the legacy AD7887 family, sharing the same 8-pin SOIC footprint and pinout. The internal reference (2.5 V, B grade) eliminates the need for an external reference in many designs and provides low drift across temperature. The serial interface supports standard SPI modes, enabling direct connection to microcontrollers and digital signal processors without glue logic.
Typical applications include portable and battery-powered instrumentation, industrial process control loops, transducer signal conditioning, multichannel data acquisition front-ends, point-of-contact scanner signal chains, and precision sensor monitoring. The wide supply range and small SOIC-8 footprint make it well suited to space-constrained designs that need deterministic latency and low power consumption.
When designing with this part, place the 0.1 µF decoupling capacitor as close as possible to the VDD pin and ensure the analog inputs are driven by low-impedance buffers for full accuracy. The internal reference does not require an external bypass capacitor for normal operation, but a small ceramic capacitor on REF improves noise rejection in hostile environments.
This page synthesizes distributor stock and pricing, drop-in compatible same-brand and cross-brand alternatives, application notes and design guidance not always found in the bare manufacturer datasheet, enabling engineers to compare, select, and source the part with confidence.
Аналоги без доработки для TSA7887BRZ-REEL — тот же корпус, pin-to-pin совместимость. Компоненты в других корпусах, требующие переработки PCB, исключены.
Варианты в этой серии
Модели той же серии, совместимые без доработки с TSA7887BRZ-REEL (тот же форм-фактор и посадочное место) — отличается по Data Interface, Number of Channels, Package, Input Type, Internal Reference Voltage.
Инструмент быстрого сравнения — выберите альтернативные компоненты для сравнения бок о бок:
TSA7887BRZ
✅ Прямая замена✓ В наличии
$1.85 / шт.
Открыть даташит →TSA7887ARMZ-REEL
✅ Прямая замена✓ В наличии
$2.55 / шт.
Открыть даташит →AD7887BRZ-REEL
✅ Прямая замена📋 Справочный аналог (нет в каталоге)
TSA7887BRZ-REEL Максимальные параметры и электрические характеристики
| Manufacturer | Silicon Labs (originally Touchstone Semiconductor) |
| Part Number | TSA7887BRZ-REEL |
| Функция | 12-Bit SAR Analog-to-Digital Converter (ADC) |
| Разрешение | 12 bit |
| Number of Channels | 2 single-ended (1 or 2 input mode, pin-selectable) |
| Частота дискретизации | 125 kSPS |
| Architecture | SAR (Successive Approximation Register) |
| Supply Voltage (VDD) | 2.7 V to 5.25 V (single supply) |
| Диапазон входного напряжения | 0 V to VREF (single-ended) |
| Internal Reference Voltage | +2.5 V (B grade) |
| Data Interface | SPI / MICROWIRE / QSPI / DSP-compatible serial |
| Input Bandwidth | Wide-bandwidth track-and-hold |
| Корпус / Типоразмер | 8-SOIC (R-8) |
| Тип монтажа | Surface Mount |
| Рабочая температура | -40°C to +85°C (industrial) |
| Lead-Free / RoHS | Compliant (per DigiKey listing) |
| Pin Configuration | Drop-in second source for AD7887 family, 8-SOIC |
| Duty Class | Micropower |
Конфигурация выводов TSA7887BRZ-REEL
| Контакт 1 | VDD — Single-supply power input, 2.7 V to 5.25 V |
| Контакт 2 | AIN1 — Analog input channel 1 (single-ended, 0 to VREF) |
| Контакт 3 | AIN2 — Analog input channel 2 (single-ended, 0 to VREF) |
| Контакт 4 | REF — Internal +2.5 V reference output / input |
| Контакт 5 | GND — Analog and digital ground |
| Контакт 6 | CS — Chip-select input, active low, frames conversion |
| Контакт 7 | DOUT — Serial data output, SPI/MICROWIRE/QSPI/DSP-compatible |
| Контакт 8 | SCLK — Serial clock input for the SPI-compatible interface |
Типичное применение
TSA7887BRZ-REEL подходит для 7 применениеs: Portable Battery-Powered Instrumentation, Industrial Process Control Loops, Transducer and Bridge Sensor Signal Conditioning, Point-of-Care and Diagnostic Medical Devices, Multichannel Data Acquisition Front-Ends, Wireless Sensor Nodes and IoT Edge Devices, Point-of-Sale and Scanner Electronics.
Portable Battery-Powered Instrumentation
The TSA7887BRZ-REEL fits portable battery-powered instrumentation because it is explicitly characterized as a micropower 12-bit, 125-kSPS SAR ADC with a single 2.7 V to 5.25 V supply. The internal +2.5 V reference eliminates the current draw of an external reference, while the SPI/MICROWIRE/QSPI serial interface saves 3-5 GPIOs versus a parallel ADC. In a handheld multimeter or data-logger design, the part directly digitizes sensor signals from a 2-cell AA or Li-ion source, with deterministic latency suitable for triggered captures.
Рекомендуется
Industrial Process Control Loops
The TSA7887BRZ-REEL suits industrial process-control loops because it delivers 12-bit accuracy with no missing codes at 125 kSPS, accepting 0 V to VREF analog inputs from 4-20 mA-derived or thermocouple/bridge transducers. The wide-bandwidth internal track-and-hold captures step inputs without slew-induced distortion, while the 2.7 V to 5.25 V supply tolerates 24V-bus-derived rails after regulation. Two single-ended channels permit simultaneous monitoring of two sensor streams in PLC or DCS modules.
Рекомендуется
Transducer and Bridge Sensor Signal Conditioning
The TSA7887BRZ-REEL integrates well into transducer and bridge sensor front-ends because the internal +2.5 V reference can directly drive the bridge excitation, while the high-impedance analog inputs accept low-level strain-gauge or load-cell outputs. With 12-bit resolution and the wide-bandwidth track-and-hold, the ADC maintains accuracy over temperature and time, while the SPI output simplifies isolated digital transmission in factory-automation backplanes.
Рекомендуется
Point-of-Care and Diagnostic Medical Devices
The TSA7887BRZ-REEL fits point-of-care and portable diagnostic devices due to its micropower consumption, small 8-SOIC footprint and deterministic SAR conversion latency. The 12-bit resolution is sufficient for glucose meters, pulse oximeters and temperature monitors where signals are slow-moving and accuracy is more important than speed. The internal +2.5 V reference reduces external components which is critical for compact disposable or wearable designs.
Рекомендуется
Multichannel Data Acquisition Front-Ends
The TSA7887BRZ-REEL supports multichannel data acquisition front-ends because its 2-channel input can be combined with external MUXing for higher channel counts while keeping the SPI bus simple. The 125 kSPS throughput allows aggregate sampling rates above 50 kSPS per channel when time-multiplexed, and the serial output minimizes FPGA pin usage. This makes it an efficient front-end for compact DAQ modules, USB-based loggers and rack-mount instrumentation.
Рекомендуется
Wireless Sensor Nodes and IoT Edge Devices
The TSA7887BRZ-REEL aligns with wireless sensor node and IoT edge-device designs because the micropower SAR core and single 2.7 V to 5.25 V supply minimize battery drain while supporting direct interface to coin-cell, AA or energy-harvested rails. The 2-channel input accommodates redundant or multi-modal sensors (temperature + humidity, or voltage + current), and the SPI output talks directly to common Cortex-M microcontrollers used in BLE/Zigbee/LoRA nodes. The internal reference removes one more power-consuming external IC, helping extend battery life.
Рекомендуется
Point-of-Sale and Scanner Electronics
The TSA7887BRZ-REEL suits point-of-sale and scanner electronics because its 2 single-ended channels and 125 kSPS speed can digitize analog sensor streams such as barcode imager reference voltages or optical touch signals. The 8-SOIC footprint saves PCB space in compact scanner housings, while the SPI interface simplifies connection to embedded MCUs running scanning firmware. Operating from a 3.3 V rail shared with the rest of the system, it eliminates the need for additional power rails.
Рекомендуется
Сводка рекомендуемых товаров
Справочные инженерные данные для TSA7887BRZ-REEL — сравнение, рекомендации по проектированию и информация о соответствии.
Руководство по выбору
Сравнение с аналогами
| Параметр | Этот товар | TSA7887BRZ | TSA7887ARMZ-REEL | AD7887BRZ-REEL |
|---|---|---|---|---|
| Package | 8-SOIC (R-8) | 8-SOIC (R-8) - same | 8-MSOP - smaller footprint, same family | 8-SOIC (R-8) - same |
| Brand | Silicon Labs | Silicon Labs - same | Silicon Labs - same | Analog Devices - original part |
| Resolution | 12-bit | 12-bit - same | 12-bit - same | 12-bit - same |
| Sampling Rate | 125 kSPS | 125 kSPS - same | 125 kSPS - same | 125 kSPS - same |
| Supply Voltage | 2.7 V to 5.25 V | 2.7 V to 5.25 V - same | 2.7 V to 5.25 V - same | 2.7 V to 5.25 V - same |
| Internal Reference | +2.5 V (B grade) | +2.5 V (B grade) - same | +2.5 V (A grade) - lower accuracy grade | +2.5 V - same |
| Number of Channels | 2 single-ended | 2 single-ended - same | 2 single-ended - same | 2 single-ended - same |
| Serial Interface | SPI/MICROWIRE/QSPI/DSP | SPI/MICROWIRE/QSPI/DSP - same | SPI/MICROWIRE/QSPI/DSP - same | SPI/MICROWIRE/QSPI/DSP - same |
| Operating Temperature | -40°C to +85°C | -40°C to +85°C - same | -40°C to +85°C - same | -40°C to +85°C - same |
| Price @ 1k (USD, approx.) | $2.40 | $2.40 - same (tube) | $2.10 - A grade, MSOP cheaper | $3.10 - ADI branded, typically higher |
Ключевые отличия
- Pin-compatible second-source to legacy AD7887 family (против AD7887BRZ-REEL)
- Internal +2.5 V reference integrated (против MAX1280 vs AD7887 ext-ref variants)
- Wide single-supply 2.7 V to 5.25 V operation (против MAX187CEPA (5 V only))
Заметки по проектированию
Decouple the VDD pin (pin 1) with a 0.1 µF ceramic capacitor placed as close to the IC as possible, with a 1 µF to 10 µF bulk capacitor at the supply rail. The internal +2.5 V reference (pin 4) draws small steady current; adding a 0.1 µF to 1 µF ceramic bypass on REF reduces high-frequency noise coupling. The part accepts 2.7 V to 5.25 V, so no negative rail is required even when digitizing signals near ground.
Route the analog inputs (AIN1, AIN2) and the reference pin (REF) over a continuous ground plane, keeping digital traces (CS, DOUT, SCLK) physically separated to avoid coupling noise into the analog front-end. Place the part away from switching regulators and high-speed digital buses; use guard traces around AIN1/AIN2 if the board has hostile switching signals nearby.
Do not exceed the absolute maximum ratings on the analog inputs (typically VDD + 0.3 V); clamp transients with TVS or series resistance if the source can swing beyond VDD. The CS pin is active-low: leaving it floating or tied high disables conversions and leaves DOUT in three-state. When operating from a 5 V rail, ensure your MCU's SPI pins are 5 V tolerant or use a level shifter to avoid damage to 3.3 V-only GPIOs.
Drive AIN1/AIN2 from low-impedance op-amp buffers (≤ 1 kΩ output impedance) for full 12-bit accuracy, especially at higher sample rates near 125 kSPS. Add a small RC anti-aliasing filter (typically 1 kΩ + 1 nF) ahead of the input to suppress out-of-band noise above the Nyquist frequency. Keep SCLK traces short and series-terminate if the cable/bus length exceeds a few centimeters.
Информация о соответствии
RoHS and lead-free status per DigiKey listing; halogen-free status not stated in verified web data and marked as unknown.
