MAX1393MTB+T - 12-Bit 312.5ksps SAR ADC | Maxim Integrated
MPN: MAX1393MTB+T ✓ فعالMAX1393MTB+T جائزہ
An SAR ADC is a successive-approximation-register converter that performs a binary search against the analog signal using an internal DAC and comparator. Each conversion completes in one cycle of the internal clock, producing a deterministic latency and no pipeline delay. SAR ADCs occupy a unique position in the data-converter hierarchy: they sit between sigma-delta (highest resolution, lowest speed) and flash (lowest resolution, highest speed) converters, offering 8-18 bit resolution at 100 ksps to multi-msps sampling rates with very low active power. This makes them the default choice for multiplexed multi-channel low-frequency precision sampling.
Key features of the MAX1393MTB+T include 312.5 ksps throughput, true-differential or 2-channel single-ended input multiplexer, automatic shutdown between conversions for extended battery life, and an external reference up to AVDD. The device also integrates a high-bandwidth track-and-hold and a serial interface that supports daisy-chaining of multiple ADCs on a single SPI bus.
Architecturally, the MAX1393 uses a capacitive-charge-redistribution DAC array driven by an internal oscillator, with a single-supply LDO generating the internal core rail. The shutdown current is specified in the nanoampere range, allowing duty-cycled sampling for handheld instruments where the ADC wakes, converts, and re-enters shutdown on every host interrupt.
Typical applications include portable medical instrumentation (blood-glucose meters, pulse oximeters), 4-20 mA industrial loop transmitters, handheld multimeters, battery fuel-gauges, and sensor-interface front-ends. The wide 1.5 V to 3.6 V supply range supports direct connection to single-cell Li-ion, two-cell alkaline, or 3.3 V digital rails without level shifting.
When designing with this part, place the 1 µF AVDD bypass capacitor within 3 mm of the supply pin and keep the analog ground return separate from the digital switching return. Drive CNVST with a clean rising edge from a low-jitter timer or GPIO to minimize aperture uncertainty, especially when digitizing small signals near the 12-bit LSB threshold.
کے لیے ڈراپ اِن متبادل MAX1393MTB+T — 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 MAX1393MTB+T (یکساں فارم فیکٹر اور فٹ پرنٹ) — میں مختلف Package, Number of Channels, Resolution, Input Type, Operating Temperature.
MAX1396MTB+T
✅ ڈراپ-اِن ⚠️ تفصیلات غیر تصدیق شدہقیمت کے لیے رابطہ کریں
ڈیٹا شیٹ دیکھیں →MAX11120ATI+T
✅ ڈراپ-اِن ⚠️ تفصیلات غیر تصدیق شدہقیمت کے لیے رابطہ کریں
ڈیٹا شیٹ دیکھیں →MAX11164ETC+T
✅ ڈراپ-اِن ⚠️ تفصیلات غیر تصدیق شدہقیمت کے لیے رابطہ کریں
ڈیٹا شیٹ دیکھیں →MAX1119EKA-T
✅ ڈراپ-اِن ⚠️ تفصیلات غیر تصدیق شدہقیمت کے لیے رابطہ کریں
ڈیٹا شیٹ دیکھیں →MAX1115EKA+G002
✅ ڈراپ-اِن ⚠️ تفصیلات غیر تصدیق شدہقیمت کے لیے رابطہ کریں
ڈیٹا شیٹ دیکھیں →MAX1393MTB+T زیادہ سے زیادہ ریٹنگز اور برقی خصوصیات
| ریزولوشن | 12 bits |
| Architecture | SAR (Successive Approximation Register) |
| سیمپلنگ ریٹ | 312.5 ksps |
| Number of Channels | 1 differential / 2 single-ended (input mux) |
| سپلائی وولٹیج | 1.5 V to 3.6 V (single supply) |
| Input Type | True differential or single-ended |
| Reference Type | External (up to AVDD) |
| انٹرفیس | SPI / QSPI / MICROWIRE-compatible, 3-wire serial |
| آپریٹنگ درجہ حرارت | -40 °C to +85 °C (industrial) |
| پیکیج | 10-pin TDFN-EP (3 mm × 3 mm) |
| ماؤنٹنگ ٹائپ | Surface Mount |
| RoHS اسٹیٹس | Compliant |
| Lead-Free | Yes |
MAX1393MTB+T پن کنفیگریشن
| پن 1 | AIN+ — Positive analog input (differential) / input 1 (single-ended) |
| پن 2 | AIN- — Negative analog input (differential) / input 2 (single-ended) |
| پن 3 | REF — External reference voltage input |
| پن 4 | AVDD — Analog supply voltage (1.5 V to 3.6 V) |
| پن 5 | GND — Analog ground |
| پن 6 | CNVST — Active-low conversion start input |
| پن 7 | DIN — Serial data input (for daisy-chain mode) |
| پن 8 | SCLK — Serial clock input |
| پن 9 | DOUT — Serial data output |
| پن 10 | EP — Exposed thermal pad (tie to GND ground plane) |
عام استعمالات
MAX1393MTB+T کے لیے موزوں ہے 6 ایپلیکیشنs: Portable Medical Instrumentation, 4-20 mA Industrial Loop Transmitter, Handheld Digital Multimeter, Battery Fuel Gauge and Battery Monitoring, Sensor Interface Front-End (Thermocouple / RTD / Bridge), Data-Acquisition Modules and PLC Analog Inputs.
Portable Medical Instrumentation
The MAX1393MTB+T fits handheld medical devices such as blood-glucose meters, pulse oximeters, and patient thermometers where 12-bit resolution at 312.5 ksps is sufficient for sensor signal conditioning. The 1.5 V to 3.6 V supply supports direct connection to a single-cell Li-ion or two-cell alkaline battery, and the automatic shutdown between conversions drops standby current to the nanoampere range to extend battery life across multi-month replacement cycles. Placed between the sensor front-end and the MCU's SPI bus, it samples once on a CNVST pulse and reports the conversion over the 3-wire SPI; disease site can be daisy-chained with multiple MAX1396 devices for synchronized multi-site sampling without an external analog switch.
تجویز کردہ
4-20 mA Industrial Loop Transmitter
The MAX1393MTB+T digitizes the loop-current sense resistor in a 4-20 mA smart transmitter, converting the analog process variable to a 12-bit digital code for the loop microcontroller. Its true-differential input stage rejects common-mode noise from long field wiring, and the 312.5 ksps throughput allows >100 Hz update rates with margin for digital filtering. Positioned between the sense resistor and the MCU SPI master, it operates from the loop's 24 V bus stepped down to 3.3 V; the fire site benefits from <1 mA active current, leaving the bulk of the 4 mA loop budget for the sensor itself without violating the HART (hardware-addressable remote transducer) protocol's low-current requirement.
تجویز کردہ
Handheld Digital Multimeter
The MAX1393MTB+T serves as the measurement ADC in a handheld DMM, digitizing the auto-ranging shunt or voltage-divider output across multiple ranges. Its true-differential input accepts both polarities without an input-polarity-reversal switch, and the 12-bit resolution gives 4096 counts - sufficient for a 3½-digit display plus autoranging headroom. Mounted adjacent to the range-switch relay bank with a 1 µF AVDD bypass cap, it samples once per measurement cycle and enters shutdown between conversions; fire site is reduced for short time during each autorange dwell, while standby current draws negligible power from the 9 V battery.
تجویز کردہ
Battery Fuel Gauge and Battery Monitoring
The MAX1393MTB+T monitors cell voltage and current in single-cell Li-ion battery packs where its 1.5 V minimum supply allows direct connection to the cell itself without a boost converter. The 2-channel single-ended mux digitizes both the pack voltage and the sense-resistor current simultaneously, supporting coulomb-counting fuel-gauging algorithms. Placed across the sense resistor with differential-mode sampling, it provides 12-bit accuracy on a ±1 A sense range; fire site is in the protection circuit module (PCM), sharing the same ground reference as the protection FETs to avoid ground-loop errors in the digitized voltage and current samples.
تجویز کردہ
Sensor Interface Front-End (Thermocouple / RTD / Bridge)
The MAX1393MTB+T digitizes low-level analog signals from thermocouples, RTDs, and strain-gauge bridges in industrial sensor modules, where its true-differential input rejects common-mode pickup from motor drives and 50/60 Hz mains. Its 312.5 ksps throughput supports software-oversampling averaging for effective resolution beyond 12 bits in low-bandwidth temperature measurements. Mounted at the output of the instrumentation-amp front-end with a low-TC external reference, it provides ratiometric conversion; fire site is the sensor module so terminated to the same analog ground plane as the bridge excitation source for proper ratiometric conversion in the digitized bridge output.
تجویز کردہ
Data-Acquisition Modules and PLC Analog Inputs
The MAX1393MTB+T serves as a per-channel ADC in modular data-acquisition systems and PLC analog-input cards where compact 10-pin TDFN packaging allows high channel density. Its SPI interface supports daisy-chaining multiple devices on a single chip-select, allowing 8-16 channels of synchronized sampling from one MCU SPI peripheral. Placed adjacent to each channel's input-protection TVS and filter network, it samples on a low-jitter timer interrupt and reports conversions to the PLC backplane; fire site is the analog-input module, with thermal-pad groundings to the analog ground plane for low-impedance analog reference and reduced digital switching noise coupling into the digitized signal.
تجویز کردہ
تجویز کردہ پروڈکٹس کا خلاصہ
کے لیے انجینئرنگ ریفرنس ڈیٹا MAX1393MTB+T — موازنہ، ڈیزائن رہنمائی، اور تعمیل کی معلومات۔
انتخاب کی گائیڈ
متبادلات کے ساتھ موازنہ
| پیرامیٹر | یہ پروڈکٹ | MAX1396MTB+T | MAX11120ATI+T | MAX11164ETC+T | MAX1119EKA-T | MAX1115EKA+G002 |
|---|---|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Package | 10-pin TDFN-EP (3x3 mm) | 10-pin TDFN-EP (3x3 mm) - same | 10-pin TDFN-EP - same | 10-pin TDFN-EP - same | 10-pin TDFN-EP - same | 10-pin TDFN-EP - same |
| Resolution | 12 bits | 12 bits | 12 bits | 12 bits | 12 bits | 12 bits |
| Interface | SPI / QSPI / MICROWIRE | SPI / QSPI / MICROWIRE | SPI | SPI | SPI | SPI |
| Automatic Shutdown | Yes | Yes | Yes | Yes | Yes | Yes |
اہم امتیازی خصوصیات
- Automatic shutdown with fast wake-up between conversions (بمقابلہMAX1119EKA-T)
- True-differential input architecture (بمقابلہMAX11164ETC+T)
- Daisy-chain-capable SPI interface (بمقابلہMAX11120ATI+T)
ڈیزائن نوٹس
Place a 1 µF X7R ceramic bypass capacitor as close as possible (within 3 mm) to the AVDD pin with a short, wide trace to the analog ground plane. A 0.1 µF capacitor in parallel improves noise suppression above 10 MHz. For battery applications, the AVDD trace should be star-routed from the battery with no other high-current devices on the same trace to avoid load-transient coupling into the reference voltage.
Solder the exposed thermal pad (EP) to a continuous analog ground plane for both thermal dissipation and low-impedance grounding of the internal reference. Separate analog and digital ground returns and join them at a single point under the IC. Keep the analog input traces short and guarded by a ground trace on either side to reduce common-mode pickup from SPI/CLK edges.
Drive CNVST with a clean, low-jitter rising edge (jitter <50 ps RMS) from a hardware timer or a dedicated GPIO to minimize sampling-aperture uncertainty. Avoid routing CNVST near switching sources, or use a series resistor at the source to damp ringing. Keep the SPI traces (SCLK, DOUT, DIN) short and length-matched if daisy-chaining multiple ADCs on the same bus to avoid setup/hold violations.
Do not exceed AVDD on the REF input or on AIN+/AIN-; absolute maximum ratings apply. Do not omit the REF bypass capacitor (typically 0.1 µF to 1 µF) - omitting it injects reference noise into the conversion. When operating in single-ended mode, tie AIN- to analog ground rather than leaving it floating to prevent charge injection from the internal mux switching.
تعمیل کی معلومات
RoHS compliant per Maxim Integrated product page. Operating temperature -40C to +85C is industrial-grade, not AEC-Q100 automotive qualified.
