TSA7887ARMZ - 12-Bit 125ksps 2-Ch SAR ADC | Silicon Labs
MPN: TSA7887ARMZ ✓ فعالTSA7887ARMZ جائزہ
An SAR ADC (successive-approximation-register analog-to-digital converter) is a type of data converter that uses a binary-search algorithm against an internal capacitive DAC to resolve an analog input one bit per conversion clock cycle. It belongs to the broad family of analog-to-digital converters (ADCs), which itself is part of the data-converter hierarchy inside mixed-signal and signal-chain integrated circuits. The SAR architecture is favored over delta-sigma and pipeline ADCs when low-latency deterministic conversion, small package size, and moderate sample rates (tens to hundreds of ksps) are required, particularly in multiplexed multi-channel systems.
Key features of the TSA7887ARMZ include an internal 2.5V reference (selectable externally via the REF pin), a 2-channel analog input multiplexer, true 12-bit performance with no missing codes, a 125 ksps maximum throughput, low power dissipation (typically under 2.5 mW at 3V/100 ksps), and automatic power-down between conversions that drops supply current below 1 microampere. The device uses an external clock for the serial interface and supports both unipolar single-ended and pseudo-differential input configurations.
The device leverages a charge-redistribution SAR core with input transient suppression and an automatic input common-mode settling window, which makes it tolerant of source-impedance variations when channels are switched. Combined with the internal precision reference, this means the TSA7887ARMZ can replace an external ADC + reference + op-amp buffer chain in many space-constrained designs.
Typical applications include portable and battery-powered data loggers, industrial process-control sensor front-ends (thermocouple, RTD, strain-gauge bridges), handheld instrumentation, and multiplexed 4-20 mA loop monitors. Designers also use it in optical sensor modules and consumer battery chargers where periodic current/voltage telemetry is required.
When designing with this part, size the input RC network and reference bypass capacitors per the datasheet's application circuit - inadequate decoupling is the most common cause of last-2-LSB noise and gain drift in SAR circuits. Consider the MAX1276CTC+ from Maxim's family as a drop-in 8-pin MSOP alternative if higher conversion speed is needed.
This page synthesizes distributor pricing, drop-in MSOP-8 alternatives, and practical design notes not found in the manufacturer datasheet alone.
کے لیے ڈراپ اِن متبادل TSA7887ARMZ — 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 TSA7887ARMZ (یکساں فارم فیکٹر اور فٹ پرنٹ) — میں مختلف Package, Architecture, Sampling Rate, Number of Channels, Resolution.
TSA7887ARMZ-REEL
✅ ڈراپ-اِنقیمت کے لیے رابطہ کریں
ڈیٹا شیٹ دیکھیں →MAX1276CTC+T
✅ ڈراپ-اِنقیمت کے لیے رابطہ کریں
ڈیٹا شیٹ دیکھیں →MAX1275ACTC+T
✅ ڈراپ-اِنقیمت کے لیے رابطہ کریں
ڈیٹا شیٹ دیکھیں →MAX1295BCEI
✅ ڈراپ-اِنقیمت کے لیے رابطہ کریں
ڈیٹا شیٹ دیکھیں →MAX157BEPA
✅ ڈراپ-اِنقیمت کے لیے رابطہ کریں
ڈیٹا شیٹ دیکھیں →TSA7887ARMZ زیادہ سے زیادہ ریٹنگز اور برقی خصوصیات
| ریزولوشن | 12 bits |
| Number of Channels | 2 (single-ended) / 1 (pseudo-differential) |
| سیمپلنگ ریٹ | 125 ksps |
| Architecture | SAR (Successive Approximation Register) |
| Input Type | Single-ended, pseudo-differential |
| Analog Supply Voltage | 2.7 V to 5.25 V |
| Digital Supply Voltage | 2.7 V to 5.25 V |
| Internal Reference Voltage | 2.5 V |
| Reference Mode | Internal 2.5 V or external |
| Digital Interface | SPI / QSPI / MICROWIRE-compatible serial |
| شٹ ڈاؤن کرنٹ | < 1 µA |
| آپریٹنگ درجہ حرارت | -40 °C to +85 °C |
| پیکیج | 8-pin MSOP (RMZ) |
| ماؤنٹنگ ٹائپ | Surface Mount |
| RoHS اسٹیٹس | Compliant |
| Grade | Industry / xIND second source |
TSA7887ARMZ پن کنفیگریشن
| پن 1 | AIN1 / I.C. — Analog input channel 1 (or pseudo-differential negative input) |
| پن 2 | REF / AIN0 — Internal 2.5V reference bypass / analog input channel 0 |
| پن 3 | GND — Analog and digital ground |
| پن 4 | CS — Active-low chip select for SPI interface |
| پن 5 | SCLK — Serial clock input for SPI/QSPI/MICROWIRE |
| پن 6 | DOUT — Serial data output (ADC conversion results) |
| پن 7 | VDD — Analog and digital supply (2.7 V to 5.25 V) |
| پن 8 | SHDN — Hardware shutdown, low = power-down (<1 uA) |
عام استعمالات
TSA7887ARMZ کے لیے موزوں ہے 7 ایپلیکیشنs: Battery-Powered Data Loggers, Industrial Process Control Sensor Front-Ends, Handheld Test & Measurement Instrumentation, Optical Sensor Modules, Consumer Battery Chargers, Multiplexed 4-20 mA Loop Monitors, Strain-Gauge Bridge Readout (Weigh Scales).
Battery-Powered Data Loggers
The TSA7887ARMZ excels in battery-powered data loggers because of its 12-bit SAR precision, <1 µA auto power-down current between conversions, and 2.5 mW active dissipation at 3V/100 ksps. Packaged in a 3 mm x 3 mm MSOP-8, it occupies minimal PCB area, leaving more room for the battery and BLE module. The internal 2.5V reference eliminates a separate reference IC, shrinking the BOM. For example, in a remote environmental sensor running on a single CR2032 coin cell, the TSA7887ARMZ can settle a single conversion in 8 µs, return to <1 µA standby, and achieve multi-year battery life. Designers should pair it with low-power MCUs like TI MSP430 or Silicon Labs' own EFM32 family. Performance tip: bypass AVDD with a 1 µF X7R ceramic plus a 0.1 µF HF cap placed within 2 mm of the supply pin to avoid last-2-LSB gain drift.
تجویز کردہ
Industrial Process Control Sensor Front-Ends
In industrial process-control loops reading thermocouples, RTDs, and 4-20 mA current loops, the TSA7887ARMZ delivers the 12-bit resolution and 125 ksps throughput needed for the typical 4 Hz to 10 kHz control loop. Its 2-channel mux allows simultaneous monitoring of a process variable and a diagnostic point - for instance temperature plus supply current. The internal 2.5V reference ratiometrically rejects supply drift, while the SPI/QSPI/MICROWIRE-compatible serial port interfaces directly to most industrial MCUs. Performance consideration: front-end protection with TVS diodes and isolated signal chains (e.g. using ISO7241 isolators) preserves the ADC's input range. The 8-pin MSOP footprint keeps the front-end compact within DIN-rail-mounted I/O modules.
تجویز کردہ
Handheld Test & Measurement Instrumentation
Handheld multimeters, oscilloscope probes, and field calibration tools benefit from the TSA7887ARMZ's low power draw and 2-channel input. Its SAR architecture provides deterministic low-latency conversion - no pipeline delay - making single-shot acquisitions of AC line voltages and RF envelope detectors clean and repeatable. The 2.5V internal reference supports true 2.5V full-scale inputs, simplifying per-channel scaling. The 3 mm x 3 mm MSOP-8 package suits highly miniaturized handheld form factors like clamp meters and optical tachometers. Battery-life benefit: with auto power-down between conversions, the ADC contributes negligibly to standby drain on a Li-ion-powered handheld. Calibrate once per shift using an external 4.096V reference override on the REF pin.
تجویز کردہ
Optical Sensor Modules
Optical sensor modules - ambient light sensors, colorimeters, and proximity detectors - frequently require a small fast ADC for translating photodiode current into a digital code. The TSA7887ARMZ's 12-bit resolution across two channels lets the module digitize both the sensor signal and an LED drive-current monitor simultaneously. Its low noise floor and small MSOP-8 package support the tight form factor of wearable or smartphone-embedded modules. Performance tip: drive the photodiode through a transimpedance amplifier (TIA) and DC-cancel any ambient by chopping the LED; the TSA7887ARMZ settles within 8 µs - fast enough for 10 kHz synchronized sampling.
تجویز کردہ
Consumer Battery Chargers
In smart consumer battery chargers (Li-ion, NiMH, lead-acid), the TSA7887ARMZ monitors charge voltage and current via two analog channels, providing closed-loop telemetry to the charger MCU. With 12-bit resolution, the device can resolve sub-10 mV on a 5V scale - enough for accurate CC/CV charge-transition detection. The internal 2.5V reference is ratiometric to a 5V USB rail when used with a precision divider, eliminating a separate reference. Power dissipation is modest enough that even 1 A-capable chargers stay within thermal envelope. Application tip: pair with a low-side current-sense amplifier (e.g. INA180) and route both signals to the 2 channels of the TSA7887ARMZ for fully digital telemetry.
تجویز کردہ
Multiplexed 4-20 mA Loop Monitors
Programmable Logic Controllers (PLCs) and process-control remote I/O modules handle dozens of 4-20 mA current loops per board. The TSA7887ARMZ is well suited as a per-board low-cost 12-bit ADC for these loops; while most PLCs prefer higher-density 16-channel SAR converters, the TSA7887ARMZ covers distributed I/O nodes that require only 2 channels each. The MSOP-8 footprint keeps per-channel PCB density low, and the internal reference simplifies ratiometric conversion from a 250 Ω sense resistor. Performance tip: place a 250 Ω ±0.1% precision resistor in series with each loop and buffer with a low-offset op-amp before the ADC input to maintain 12-bit integrity across temperature.
تجویز کردہ
Strain-Gauge Bridge Readout (Weigh Scales)
Compact digital weighing scales and force gauges often pair a 4-arm Wheatstone bridge load cell with a low-power 12-bit ADC. The TSA7887ARMZ's 2 channels allow simultaneous reading of the bridge output (after amplification) and a temperature sensor for compensation. Its auto power-down between conversions keeps average current draw below 5 mW on a 5V USB-C powered scale, even at 100 conversions per second. The 2.5V internal reference can be overdriven by an external ratiometric 1.024V or 2.5V low-drift reference like the MAX6129 for higher-precision applications. Design tip: select an instrumentation amplifier (e.g. INA333) with low offset drift to preserve the TSA7887ARMZ's 12-bit noise-free resolution across the 0-3 mV/V bridge output range.
تجویز کردہ
تجویز کردہ پروڈکٹس کا خلاصہ
کے لیے انجینئرنگ ریفرنس ڈیٹا TSA7887ARMZ — موازنہ، ڈیزائن رہنمائی، اور تعمیل کی معلومات۔
انتخاب کی گائیڈ
متبادلات کے ساتھ موازنہ
| پیرامیٹر | یہ پروڈکٹ | TSA7887ARMZ-REEL | MAX1276CTC+T | MAX1275ACTC+T | MAX1295BCEI | MAX157BEPA |
|---|---|---|---|---|---|---|
| Brand | Silicon Labs | Silicon Labs | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Package | MSOP-8 (RMZ) | MSOP-8 (RMZ) - same | TDFN-12 - similar small SMD | MSOP-10 - same family, slightly larger | QSOP-28 - larger | PDIP-8 - through-hole |
| Resolution | 12 bits | 12 bits | 12 bits | 12 bits | 12 bits | 10 bits |
| Sampling Rate | 125 ksps | 125 ksps | 200 ksps | 225 ksps | 250 ksps | 200 ksps |
| Number of Channels | 2 | 2 | 12 | 8 | 12 | 2 |
| Internal Reference Voltage | 2.5 V | 2.5 V | 2.5 V | 4.096 V | 2.5 V | 2.5 V |
| Supply Voltage Range | 2.7 V to 5.25 V | 2.7 V to 5.25 V | 3 V to 3.6 V | 4.75 V to 5.25 V | 4.75 V to 5.25 V | 2.7 V to 5.25 V |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | 0 °C to +70 °C | 0 °C to +70 °C | -40 °C to +85 °C | -40 °C to +85 °C |
| Shutdown Current | < 1 µA | < 1 µA | 1 µA | 5 µA | 5 µA | 10 µA |
اہم امتیازی خصوصیات
- Lowest shutdown current in class (< 1 µA) (بمقابلہMAX157BEPA)
- True 12-bit, no-missing-codes performance (بمقابلہMAX157BEPA)
- MSOP-8 footprint with internal 2.5V reference (بمقابلہMAX1295BCEI)
ڈیزائن نوٹس
Bypass AVDD and DVDD with a 1 µF X7R ceramic plus a 0.1 µF HF ceramic placed within 2 mm of the supply and GND pins. SAR ADCs draw transient currents on each conversion clock edge; inadequate decoupling is the most common cause of last-2-LSB noise and apparent gain drift. For battery-powered designs, route the chip select (CS) high between conversions to allow the internal auto power-down to drop supply current below 1 µA.
Keep the analog input traces short, symmetric, and routed over a single continuous ground plane. Avoid routing digital lines (CS, SCLK, DOUT) parallel to AIN0/AIN1, which couples digital switching transients into the analog front-end. Place the reference bypass capacitor (1 µF minimum, 10 µF preferred for very high source-impedance sensors) directly across the REF pin to GND. Recommendation: use a 4-layer PCB with separate analog and digital ground planes tied only at the ADC GND pin.
Do not exceed the 2.7V-5.25V absolute maximum ratings on AVDD; reverse-polarity protection is not built in. The SHDN pin must be tied high through a pull-up resistor if unused, otherwise the part can latch in shutdown after power-up. The REF pin is not ratiometric to VDD unless overdriven by an external reference; for ratiometric applications, drive AVDD with the sensor excitation voltage and overdrive REF externally. Always issue a complete SPI read (with dummy SCLK cycles) to clock out the latest conversion result before initiating the next acquisition.
Source impedance above the datasheet's 1 kΩ maximum degrades AC performance and increases crosstalk between channels because the SAR ADC's input sample-and-hold cannot fully settle. For high-impedance sensors (such as pH probes or reference electrodes), buffer the input with a CMOS-input op-amp (e.g. OPA2333 or LMP7704) before the ADC input. When using a pseudo-differential configuration, keep the negative input ground return short and shared with the ADC GND pin to avoid ground-loop noise pickup on the 12-bit conversion.
تعمیل کی معلومات
RoHS compliant per Silicon Labs product declaration. REACH SVHC compliant per EU regulatory filings. Lead-free reflow-compatible packaging. Not AEC-Q100 qualified (use automotive-grade alternatives from TI or ADI for vehicle applications). Halogen-free status unknown from verified web data; consult manufacturer datasheet.
