MAX199ACAI - 12-Bit 8-CH Multi-Range DAS, 28-SSOP | Maxim
N.º de pieza: MAX199ACAI ✓ Activo| Cant. | Precio unitario | Total |
|---|---|---|
| 1 | $37.91 | $37,91 |
| 10 | $34.4 | $344,00 |
| 100 | $28.95 | $2.895,00 |
| 500 | $24.18 | $12.090,00 |
| 1.000 | $21.12 | $21.120,00 |
MAX199ACAI Descripción general
A data-acquisition system (DAS) is an integrated circuit that combines an analog multiplexer, sample-and-hold amplifier, and analog-to-digital converter into a single chip, allowing one ADC to sequentially digitize multiple analog channels. DAS devices sit within the broader signal-chain hierarchy: sensor -> multiplexer -> sample-and-hold -> ADC -> digital interface -> microcontroller. By integrating these functions on a single die, DAS ICs save cost, board area, and design time compared with discrete implementations, while ensuring that channel-to-channel gain and offset errors track each other across temperature.
Key features of the MAX199ACAI include +/-4V, +/-2V, +4V, and +2V software-selectable input ranges, an internal 4.096V reference, ±16.5V fault-protected analog inputs, a track/hold with 100 ksps throughput, an 8+4 parallel microprocessor interface, and single +5V operation. Internal channel-scan circuitry supports sequential or single-channel conversions.
Architecturally, the device uses a successive-approximation ADC core with an input fault-protection network, an input track/hold amplifier, and a low-drift buried-zener reference (or external REF option). The input protection clamps transients up to ±16.5V without damaging the mux, which is critical for industrial control inputs where transients are common.
Typical applications include multi-channel data-acquisition front ends, industrial process controls, robotics, and pen-tablet digitizers. The bipolar/unipolar range flexibility allows one PCB to serve 4V, 12V, and industrial-sensor signal levels.
When designing with this part, place a 0.1µF ceramic bypass close to VDD and a 4.7µF tantalum bulk cap on the analog supply. The internal reference requires a 4.7µF bypass; using a smaller value increases noise and worsens INL. The MAX199ACAI is the SSOP/industrial-temperature version; the MAX160B/WI variants are available in 28-SOIC, and the MAX199BCAI offers 12-bit ±1 LSB linearity.
Alternativas directas para MAX199ACAI — mismo encapsulado, compatible pin a pin. Se excluyen las piezas de otro encapsulado que requieren retrabajo de la PCB.
Variantes de esta serie
Modelos de la misma serie compatibles directamente con MAX199ACAI (mismo factor de forma y huella) — difiere en Number of Channels, Operating Temperature, MSL Level, Resolution, RoHS Status.
Herramienta de comparación rápida — seleccione piezas alternativas para compararlas lado a lado:
MAX199BCAI
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
MAX199AEAI
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
MAX199AEAI+
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
MAX198ACAI
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
MAX196ACAI
✅ Sustitución directa✓ En stock
$35.12 / unidad
Ver hoja de datos →MAX197ACAI+T
✅ Sustitución directa✓ En stock
$11.05 / unidad
Ver hoja de datos →MAX199ACAI Valores máximos y características eléctricas
| Resolución | 12 bit |
| Number of Channels | 8 |
| Frecuencia de muestreo | 100 ksps |
| Analog Input Ranges | ±4V, ±2V, 0 to +4V, 0 to +2V |
| Tensión de alimentación | +5 V (single) |
| Input Fault Protection | ±16.5 V |
| Internal Reference | 4.096 V |
| Digital Interface | 8+4 parallel |
| Temperatura de funcionamiento | 0°C to +70°C |
| Encapsulado | 28-SSOP |
| Tipo de montaje | Surface Mount |
| Nivel MSL | 1 (unlimited) |
| Estado RoHS | Compliant |
Configuración de pines de MAX199ACAI
| Pin 1 | AIN0 — Analog input channel 0 |
| Pin 2 | AIN1 — Analog input channel 1 |
| Pin 3 | AIN2 — Analog input channel 2 |
| Pin 4 | AIN3 — Analog input channel 3 |
| Pin 5 | AIN4 — Analog input channel 4 |
| Pin 6 | AIN5 — Analog input channel 5 |
| Pin 7 | AIN6 — Analog input channel 6 |
| Pin 8 | AIN7 — Analog input channel 7 |
| Pin 9 | AGND — Analog ground |
| Pin 10 | REF — Reference voltage (4.096V internal) / external reference input |
| Pin 11 | REFADJ — Reference adjust input |
| Pin 12 | VDD — +5V analog supply |
| Pin 13 | RANG0 — Range select bit 0 |
| Pin 14 | RANG1 — Range select bit 1 |
| Pin 15 | BIP — Bipolar / unipolar mode select |
| Pin 16 | DGND — Digital ground |
| Pin 17 | CLK — External clock input (or crystal connection) |
| Pin 18 | CS — Chip select (active low) |
| Pin 19 | WR — Write strobe (active low) |
| Pin 20 | RD — Read strobe (active low) |
| Pin 21 | INT — Interrupt output (active low) |
| Pin 22 | A0 — Address line 0 / channel select |
| Pin 23 | A1 — Address line 1 / channel select |
| Pin 24 | A2 — Address line 2 / channel select |
| Pin 25 | A3 — Address line 3 / channel select |
| Pin 26 | D0 — Data bit 0 (LSB) |
| Pin 27 | D1-D3 — Data bits 1-3 (4-bit bus mode) |
| Pin 28 | D4-D7 — Data bits 4-7 (8-bit bus mode) |
Aplicaciones típicas
MAX199ACAI es adecuado para 6 aplicacións: Multi-Channel Industrial Data Acquisition, Robotics and Motion Control, Pen-Tablet and Digitizer Systems, Portable Instrumentation and Data Loggers, Medical Monitoring Equipment, Automotive Sensor Interface.
Multi-Channel Industrial Data Acquisition
The MAX199ACAI's 8 single-ended inputs, ±16.5V fault protection, and software-selectable ±4V/±2V input ranges make it a strong fit for industrial PLC analog input modules and process-control front ends. With 100 ksps throughput and 12-bit resolution, it handles typical 4-20 mA loop receivers (shunt-scaled to ±4V) and ±5V sensor bridges without external amplifiers. Placed between the sensor harness and a microcontroller or DSP, the parallel 8+4 interface delivers 100k conversions per second with deterministic latency - unlike serial ADCs that need DMA buffering. The fault protection is essential in plant environments where wiring shorts can drive inputs well beyond the supply rail.
Recomendado
Robotics and Motion Control
Robotics servo loops require simultaneous sampling of multiple position, current, and temperature sensors, and the MAX199ACAI's 8-channel 100 ksps throughput fits multi-axis robotic controllers well. The ±4V and ±2V bipolar ranges accommodate H-bridge current-sense amplifiers (typically ±2.5V or ±4V full-scale) and encoder-derived analog signals. The internal track/hold captures all 8 channels in less than 1µs of aperture, which matters when sampling motor-phase currents whose slew rate can exceed 1 V/µs. The parallel interface and dedicated INT pin simplify real-time control loops running on a host MCU or DSP.
Recomendado
Pen-Tablet and Digitizer Systems
Pen-tablet digitizers generate multiple analog position signals from the pen's inductive coupling, and the MAX199ACAI's 8-channel input and 100 ksps throughput can digitize X, Y, Z, tilt, and pressure signals from a single device. The ±4V range covers typical pen-coil amplitudes, and the 12-bit resolution gives ~2 mV LSB - enough for 2540 dpi positioning when combined with oversampling. The MAX199 is the original Maxim-recommended ADC for pen-digitizer front ends, and the SSOP package fits the slim form factor of modern tablets.
Recomendado
Portable Instrumentation and Data Loggers
Handheld multimeters, vibration loggers, and field-portable test equipment need 4-8 channels of ±5V or ±2.5V signal conditioning in a small footprint. The MAX199ACAI's 28-SSOP package (5.3 mm body) and single +5V supply minimize board area - critical for battery-powered form factors. Its 12-bit resolution and 100 ksps throughput cover most vibration and acoustic data-logging bandwidths. The internal 4.096V reference eliminates an external reference IC, further reducing BOM cost and quiescent current in battery-operated designs.
Recomendado
Medical Monitoring Equipment
Patient-monitoring front ends require multi-channel signal acquisition from ECG, temperature, respiration, and SpO2 sensors, and the MAX199ACAI's 8 inputs and ±4V/±2V bipolar ranges accommodate instrument-amplifier outputs in the typical ±2.5V range. The ±16.5V input fault protection prevents damage from defibrillator pulses or ESD events - critical in clinical environments. The 12-bit resolution is sufficient for vital-signs telemetry when paired with appropriate oversampling and DSP filtering on the host side.
Recomendado
Automotive Sensor Interface
Automotive sensor-interface modules for non-safety systems (cabin climate, seat position, battery monitoring) can use the MAX199ACAI to digitize 8 channels of 0-5V or ±2.5V signals from thermistors, position sensors, and current shunts. The internal 4.096V reference and ±16.5V fault protection handle the transients common in 12V/24V vehicle electrical systems, though for AEC-Q100 automotive-grade applications the MAX199 equivalent from Maxim's automotive portfolio should be selected. The parallel interface and 100 ksps throughput suit CAN-bus-attached sensor modules with deterministic sampling.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para MAX199ACAI — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | MAX199BCAI | MAX199AEAI+ | MAX198ACAI | MAX196ACAI | MAX197ACAI |
|---|---|---|---|---|---|---|
| Brand | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated |
| Package | 28-SSOP | 28-SSOP | 28-SSOP | 28-SSOP | 28-SSOP | 28-SSOP |
| Resolution | 12 bit | 12 bit | 12 bit | 12 bit | 12 bit | 12 bit |
| Channels | 8 | 8 | 8 | 8 | 6 | 8 |
| Input Ranges | ±4V, ±2V, 0-4V, 0-2V | ±4V, ±2V, 0-4V, 0-2V | ±4V, ±2V, 0-4V, 0-2V | ±5V, ±10V, 0-5V, 0-10V | ±5V, ±10V, 0-5V, 0-10V | ±5V, ±10V, 0-5V, 0-10V |
| Fault Protection | ±16.5V | ±16.5V | ±16.5V | ±16.5V | ±16.5V | ±16.5V |
| Supply | +5V single | +5V single | +5V single | +5V single | +5V single | +5V single |
| Interface | 8+4 parallel | 8+4 parallel | 8+4 parallel | 8+4 parallel | parallel | 8+4 parallel |
Diferenciadores clave
- Lower-voltage input ranges suit modern low-voltage signal chains (frente a MAX197ACAI)
- Standard-grade linearity sufficient for most industrial and instrumentation uses (frente a MAX199BCAI)
- Commercial temperature grade optimized for cost-sensitive designs (frente a MAX199AEAI+)
- Compact SSOP-28 footprint for space-constrained boards (frente a MAX199AEWI)
Notas de diseño
Place a 0.1µF ceramic bypass capacitor within 5 mm of the VDD pin (pin 12) and a 4.7µF tantalum bulk capacitor on the analog supply trace. The internal 4.096V reference (pin 10) requires a 4.7µF bypass to ground; using a smaller value degrades INL by 1-2 LSB and increases channel-to-channel crosstalk. AGND (pin 9) and DGND (pin 16) should be tied at a single point beneath the IC to avoid ground loops in the analog input return path.
Route the 8 analog input traces (AIN0-AIN7) as a matched-length group with ground guard traces between channels to minimize crosstalk. The CLK input (pin 17) should be shielded from analog traces - use a ground trace on each side. Keep the digital bus (D0-D7, A0-A3, CS, RD, WR, INT) away from the analog input area, ideally separated by an analog/digital ground split that joins only at the IC's AGND/DGND pins.
The MAX199ACAI's track/hold aperture is ~100 ns, so high-frequency input signals (above 1 MHz) require an external buffer amplifier to avoid -3 dB attenuation. For ±4V full-scale inputs with 12-bit resolution, the LSB is ~2 mV - use shielded twisted-pair cabling for off-board signals and keep the input trace impedance below 50 Ω to avoid reflections on fast transients. The internal mux has ~5 kΩ on-resistance; driving it from a low-impedance op-amp (<100 Ω) is required for full INL at 100 ksps.
Do not apply voltages beyond ±16.5V to the analog inputs - although fault-protected, sustained over-voltage can damage the protection network. Avoid leaving any analog input floating - unused channels should be tied to AGND through a 1 kΩ resistor to prevent crosstalk from coupling into active channels. The RANG0/RANG1/BIP pins (pins 13-15) must be driven to valid logic levels before CS goes low - floating these pins puts the device in an undefined input range. Estimated: aperture-time attenuation assumes 1 MHz sine-wave input.
Información de cumplimiento
RoHS compliant per Maxim product page. Lead-free / halogen-free packaging standard on + suffix parts. Not AEC-Q100 qualified; choose automotive-grade Maxim part for AEC-Q100 applications.