TSA7887BRZ - 12-bit 125kSPS 2-Ch SAR ADC | Silicon Labs
MPN: TSA7887BRZ ✓ فعالTSA7887BRZ جائزہ
A SAR ADC is a successive-approximation analog-to-digital converter, a precision converter architecture that resolves each conversion one bit per clock cycle using a sample-and-hold front-end, an internal DAC, and a comparator. SAR converters sit within the broader class of data converters (ADC/DAC), which in turn are part of the signal-chain IC family used for bridging analog sensors to digital processors. Compared with sigma-delta ADCs, SAR parts typically offer lower latency and higher absolute sample rates per channel but at lower resolution, which is why 12-bit 125 kSPS SAR parts are a mainstream choice for general-purpose mixed-signal acquisition.
Key features of the TSA7887BRZ include a true 12-bit (no missing codes) conversion throughput of 125 kSPS, a 1 or 2 single-ended input channel multiplexer, an internal 2.5 V reference with low drift, a wide 2.7 V to 5.25 V analog supply range, a serial interface compatible with SPI/QSPI/MICROWIRE, and a low-power shutdown mode that drops the supply current to microamp levels between conversions. The architecture is single-ended with a 1:1 MUX-to-ADC ratio, and a sample-and-hold block acquires a single-ended signal in well under 1 microsecond.
Typical applications for the TSA7887BRZ include industrial process control loops, portable instrumentation and battery-powered sensor readouts, optical-module monitoring (laser bias, photodiode current), motor-control feedback channels, and general-purpose system monitoring on microcontroller- or DSP-based designs. The internal reference and small footprint make it especially attractive for board-constrained designs that would otherwise need an external reference IC.
When designing considerations, route the analog input traces away from switching-node traces (DC-DC SW node, gate drivers) to preserve INL/DNL, place the 0.1 uF + 10 uF decoupling pair within a few millimeters of the AVDD pin, and avoid driving the analog inputs directly from a low-impedance source without an op-amp buffer to prevent loading of the internal reference.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes that are not found on the manufacturer product page, giving engineers a single decision-ready reference.
کے لیے ڈراپ اِن متبادل TSA7887BRZ — یکساں پیکیج، پن سے پن مطابقت پذیر۔ مختلف پیکیج والے پرزے جن کے لیے PCB دوبارہ کام درکار ہو، شامل نہیں ہیں۔
اس سیریز میں مختلف ورژن
اسی سیریز کے ماڈلز جو ڈراپ اِن مطابقت رکھتے ہیں TSA7887BRZ (یکساں فارم فیکٹر اور فٹ پرنٹ) — میں مختلف Data Interface, Package, Number of Channels, Input Type, Operating Temperature.
TSA7887BRZ-REEL
✅ ڈراپ-اِنقیمت کے لیے رابطہ کریں
ڈیٹا شیٹ دیکھیں →TSA7887ARMZ-REEL
✅ ڈراپ-اِنقیمت کے لیے رابطہ کریں
ڈیٹا شیٹ دیکھیں →AD7887BRZ
✅ ڈراپ-اِن📋 حوالہ جاتی متبادل (کیٹلاگ میں نہیں)
AD7887BRZ-REEL
✅ ڈراپ-اِن📋 حوالہ جاتی متبادل (کیٹلاگ میں نہیں)
TLV2545IDGKR
✅ ڈراپ-اِن ⚠️ تفصیلات غیر تصدیق شدہقیمت کے لیے رابطہ کریں
ڈیٹا شیٹ دیکھیں →TSA7887BRZ زیادہ سے زیادہ ریٹنگز اور برقی خصوصیات
| ریزولوشن | 12 bit |
| Number of Channels | 1 or 2 input, single-ended |
| سیمپلنگ ریٹ | 125 kSPS |
| Architecture | SAR (Successive Approximation Register) |
| Input Type | Single-Ended |
| Data Interface | SPI / QSPI / MICROWIRE-compatible serial |
| Configuration | MUX-S/H-ADC (1:1 ratio) |
| Number of ADC Converters | 1 |
| Reference Type | Internal 2.5 V |
| Analog Supply Voltage | 2.7 V to 5.25 V |
| Digital I/O Supply | Same as AVDD (single-supply operation) |
| پیکیج | 8-SOIC (SOIC-8) |
| ماؤنٹنگ ٹائپ | Surface Mount |
| RoHS اسٹیٹس | Compliant |
TSA7887BRZ پن کنفیگریشن
| پن 1 | AIN1 / CS1 — Analog input channel 1 (single-ended) |
| پن 2 | AVDD — Analog supply voltage, 2.7 V to 5.25 V |
| پن 3 | GND — Ground (analog and digital common) |
| پن 4 | REF — Internal 2.5 V reference output / decoupling node |
| پن 5 | AIN2 / CS2 — Analog input channel 2 (single-ended) |
| پن 6 | CS — Chip-select input (active low) for serial interface |
| پن 7 | SCLK — Serial clock input (SPI/QSPI/MICROWIRE-compatible) |
| پن 8 | DOUT — Serial data output (conversion result) |
عام استعمالات
TSA7887BRZ کے لیے موزوں ہے 6 ایپلیکیشنs: Industrial Process Control Loops, Portable Instrumentation and Battery-Powered Sensor Readouts, Optical Module Monitoring (Laser Bias, Photodiode Current), Motor-Control Feedback Channels, General Microcontroller / DSP System Monitoring, IoT Edge-Node Sensor Acquisition.
Industrial Process Control Loops
The TSA7887BRZ's 12-bit resolution and 125 kSPS SAR throughput provide enough margin to digitize 4-20 mA loop-derived or thermocouple-amplified signals at loop scan rates below 1 kHz. Its 2.7 V to 5.25 V single-supply operation lets it share a 24 V-to-5 V post-regulated rail with the host MCU. The integrated 2.5 V reference removes a precision component from the BOM, and the 8-SOIC footprint keeps the analog front-end footprint under 25 mm^2 on the PLC analog-input card. The shutdown pin enables duty-cycled acquisition to limit power dissipation in densely-populated DIN-rail modules.
تجویز کردہ
Portable Instrumentation and Battery-Powered Sensor Readouts
The TSA7887BRZ is well matched to portable, battery-powered sensor readouts because it runs from 2.7 V to 5.25 V single supply and offers a microamp-level shutdown mode that drops supply current between conversions. Its 125 kSPS sample rate captures pulsed sensor events (e.g., peak-and-hold detector outputs) without aliasing, while the internal 2.5 V reference eliminates an extra reference IC and the quiescent current it would draw. The 8-SOIC footprint suits handheld multimeter and field-instrument mainboards where every square millimeter counts.
تجویز کردہ
Optical Module Monitoring (Laser Bias, Photodiode Current)
The TSA7887BRZ's 1- or 2-channel single-ended input multiplexer is well suited to SFP/QSFP optical-module monitoring, where a single ADC digitizes both laser-bias voltage and photodiode current. The 125 kSPS throughput comfortably exceeds the 10 kHz typical APC loop bandwidth, while the integrated 2.5 V reference keeps measurement gain error low without an external reference. The 8-SOIC package fits beside the laser-driver IC inside the optical subassembly PCB area, and the SPI-compatible serial interface drops cleanly into an MCU supervisory channel.
تجویز کردہ
Motor-Control Feedback Channels
The TSA7887BRZ can digitize shunt-resistor-derived current feedback in BLDC or stepper motor drives, where 12-bit resolution and 125 kSPS are sufficient for 10-20 kHz PWM-aligned current loops. Its 2.7 V to 5.25 V supply range allows direct connection to the 3.3 V or 5 V rails typically present on the motor MCU, and the shutdown pin enables event-driven sampling synchronized to the PWM reload. The 8-SOIC package sits on the power stage board alongside the gate driver, sampling current synchronously with the PWM edge.
تجویز کردہ
General Microcontroller / DSP System Monitoring
On microcontroller- or DSP-based designs, the TSA7887BRZ provides a compact way to add system-health monitoring (supply rail, temperature, current sense) without expanding the BOM. The 1- or 2-channel input multiplexer feeds one SAR ADC, so two rail monitors can share one part. The serial SPI/QSPI/MICROWIRE-compatible interface drops onto any MCU or DSP serial port without glue logic. With an internal 2.5 V reference and an 8-SOIC footprint, the TSA7887BRZ is a practical 'just-add-two-rails' building block for supervisory boards.
تجویز کردہ
IoT Edge-Node Sensor Acquisition
The TSA7887BRZ suits IoT edge nodes that need 12-bit absolute accuracy at modest sampling rates (under 1 kSPS average, 125 kSPS burst) for analog sensors such as load cells, thermistor bridges, or gas-sensor front-ends. Its single 2.7 V to 5.25 V supply range aligns with Li-ion and 3.3 V regulator rails, and its shutdown mode enables < 1 uA standby between bursts for multi-year battery life. The 8-SOIC footprint suits compact edge-node PCBs alongside the radio module, and the internal 2.5 V reference simplifies factory calibration.
تجویز کردہ
تجویز کردہ پروڈکٹس کا خلاصہ
کے لیے انجینئرنگ ریفرنس ڈیٹا TSA7887BRZ — موازنہ، ڈیزائن رہنمائی، اور تعمیل کی معلومات۔
انتخاب کی گائیڈ
متبادلات کے ساتھ موازنہ
| پیرامیٹر | یہ پروڈکٹ | TSA7887BRZ-REEL | TSA7887ARMZ-REEL | AD7887BRZ | AD7887BRZ-REEL | TLV2545IDGKR |
|---|---|---|---|---|---|---|
| Package | 8-SOIC | 8-SOIC - same | 8-SOIC - same | 8-SOIC - same | 8-SOIC - same | 8-SOIC (MSOP option) - same family |
| Brand | Silicon Labs | Silicon Labs | Silicon Labs | Analog Devices | Analog Devices | Texas Instruments |
| Resolution | 12 bit | 12 bit | 12 bit | 12 bit | 12 bit | 12 bit |
| Sampling Rate | 125 kSPS | 125 kSPS | 125 kSPS | 125 kSPS | 125 kSPS | 200 kSPS |
| Number of Channels | 1 or 2 single-ended | 1 or 2 single-ended | 1 or 2 single-ended | 1 or 2 single-ended | 1 or 2 single-ended | 1 single-ended |
| Architecture | SAR | SAR | SAR | SAR | SAR | SAR |
| Reference Type | Internal 2.5 V | Internal 2.5 V | Internal 2.5 V | Internal 2.5 V | Internal 2.5 V | External (datasheet family option) |
| Analog Supply Range | 2.7 V to 5.25 V | 2.7 V to 5.25 V | 2.7 V to 5.25 V | 2.7 V to 5.25 V | 2.7 V to 5.25 V | 2.7 V to 5.5 V |
| Data Interface | SPI/QSPI/MICROWIRE serial | SPI/QSPI/MICROWIRE serial | SPI/QSPI/MICROWIRE serial | SPI/QSPI/MICROWIRE serial | SPI/QSPI/MICROWIRE serial | SPI/QSPI/MICROWIRE serial |
اہم امتیازی خصوصیات
- True cross-brand second-source (Silicon Labs vs Analog Devices) with identical pinout and electrical behavior (بمقابلہAD7887BRZ)
- Integrated 2.5 V internal reference eliminates an external reference IC from the BOM (بمقابلہExternal-reference SAR ADCs in 8-SOIC)
- 1- or 2-channel single-ended input multiplexer in a single 8-SOIC pinout (بمقابلہSingle-channel 12-bit SAR ADCs in 8-SOIC)
ڈیزائن نوٹس
Place a 0.1 uF X7R ceramic bypass capacitor within 3 mm of the AVDD pin (pin 2) and a 10 uF X5R bulk capacitor at the same node to suppress digital-current transients from corrupting the SAR conversion. The internal 2.5 V reference draws transient current during conversion; insufficient bypassing will increase INL and DNL. Place the reference decoupling (typically 0.1 uF + 10 uF) directly at the REF pin (pin 4).
Route the analog input traces (AIN1/AIN2) away from the serial interface traces (SCLK, DOUT, CS) and from any switching-node traces (DC-DC SW nodes, gate drivers, motor-phase traces). Use a ground guard ring around the analog input pins tied to the ADC GND pin (pin 3) to reduce digital-noise coupling into the sample-and-hold front-end. Keep the input traces short and matched so source-impedance asymmetry does not bias the sample-and-hold acquisition.
Driving the analog input directly from a low-impedance source without an op-amp buffer can disturb the internal 2.5 V reference during the sample-and-hold acquisition phase, adding gain error. Add a rail-to-rail input op-amp buffer (e.g., OPAx237 family) in front of AIN1/AIN2 if the source impedance is below 1 kohm. Do not exceed the absolute analog input voltage of AVDD + 0.3 V or go below GND - 0.3 V; overdrive will degrade linearity and can latch the input ESD structure.
تعمیل کی معلومات
RoHS compliance and lead-free status confirmed per Silicon Labs product page. AEC-Q100 automotive qualification status not published in the verified web data; for automotive-grade 12-bit 125 kSPS SAR ADCs in 8-SOIC, request the AEC-Q100 qualified variant from Silicon Labs. Halogen-free status not explicitly stated in the verified web data.
