MAX1393MTB+T - 12-Bit 312.5ksps SAR ADC | Maxim Integrated
N.º da peça: MAX1393MTB+T ✓ Ativo| Qtd. | Preço unitário | Total |
|---|---|---|
| 1 | $6.85 | $6,85 |
| 10 | $6.2 | $62,00 |
| 100 | $5.5 | $550,00 |
| 500 | $4.92 | $2.460,00 |
| 1.000 | $4.35 | $4.350,00 |
MAX1393MTB+T Visão geral
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.
Alternativas drop-in para MAX1393MTB+T — mesmo encapsulamento, compatível pino a pino. Peças de encapsulamento diferente que exigem retrabalho na PCB são excluídas.
Variantes desta série
Modelos da mesma série compatíveis como drop-in com MAX1393MTB+T (mesmo formato e footprint) — diferindo em Package, Number of Channels, Resolution, Input Type, Operating Temperature.
Ferramenta de comparação rápida — selecione peças alternativas para comparação lado a lado:
MAX1396MTB+T
✅ Drop-In ⚠️ Especificações não verificadas✓ Em estoque
$3.18 / unidade
Ver ficha técnica →MAX11120ATI+T
✅ Drop-In ⚠️ Especificações não verificadas✓ Em estoque
$3.18 / unidade
Ver ficha técnica →MAX11164ETC+T
✅ Drop-In ⚠️ Especificações não verificadas✓ Em estoque
$5.54 / unidade
Ver ficha técnica →MAX1119EKA-T
✅ Drop-In ⚠️ Especificações não verificadas✓ Em estoque
$1.74 / unidade
Ver ficha técnica →MAX1115EKA+G002
✅ Drop-In ⚠️ Especificações não verificadas✓ Em estoque
$2.18 / unidade
Ver ficha técnica →MAX1393MTB+T Classificações máximas e características elétricas
| Resolução | 12 bits |
| Architecture | SAR (Successive Approximation Register) |
| Taxa de amostragem | 312.5 ksps |
| Number of Channels | 1 differential / 2 single-ended (input mux) |
| Tensão de alimentação | 1.5 V to 3.6 V (single supply) |
| Input Type | True differential or single-ended |
| Reference Type | External (up to AVDD) |
| Interface | SPI / QSPI / MICROWIRE-compatible, 3-wire serial |
| Temperatura de operação | -40 °C to +85 °C (industrial) |
| Encapsulamento | 10-pin TDFN-EP (3 mm × 3 mm) |
| Tipo de montagem | Surface Mount |
| Status RoHS | Compliant |
| Lead-Free | Yes |
Configuração de pinos do MAX1393MTB+T
| Pino 1 | AIN+ — Positive analog input (differential) / input 1 (single-ended) |
| Pino 2 | AIN- — Negative analog input (differential) / input 2 (single-ended) |
| Pino 3 | REF — External reference voltage input |
| Pino 4 | AVDD — Analog supply voltage (1.5 V to 3.6 V) |
| Pino 5 | GND — Analog ground |
| Pino 6 | CNVST — Active-low conversion start input |
| Pino 7 | DIN — Serial data input (for daisy-chain mode) |
| Pino 8 | SCLK — Serial clock input |
| Pino 9 | DOUT — Serial data output |
| Pino 10 | EP — Exposed thermal pad (tie to GND ground plane) |
Aplicações típicas
MAX1393MTB+T é adequado para 6 aplicaçãos: 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.
Recomendado
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.
Recomendado
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.
Recomendado
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.
Recomendado
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.
Recomendado
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.
Recomendado
Resumo dos produtos recomendados
Dados de referência de engenharia para MAX1393MTB+T — comparação, orientação de projeto e informações de conformidade.
Guia de seleção
Comparação com alternativas
| Parâmetro | Este produto | 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 |
Principais diferenciais
- Automatic shutdown with fast wake-up between conversions (vs MAX1119EKA-T)
- True-differential input architecture (vs MAX11164ETC+T)
- Daisy-chain-capable SPI interface (vs MAX11120ATI+T)
Notas de projeto
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.
Informações de conformidade
RoHS compliant per Maxim Integrated product page. Operating temperature -40C to +85C is industrial-grade, not AEC-Q100 automotive qualified.
