MAX199ACAI - 12-Bit 8-CH Multi-Range DAS, 28-SSOP | Maxim
MPN: MAX199ACAI ✓ AktifMAX199ACAI Ringkasan
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.
Alternatif penggantian untuk MAX199ACAI — paket yang sama, pin-pada-pin kompatibel. Bagian paket yang berbeda memerlukan kerja ulang PCB diabaikan.
Variasi di dalam seri ini
Model-series yang sama yang kompatibel dengan penggantian MAX199ACAI (sama faktor bentuk dan footprint) — berbeda di dalam Number of Channels, Operating Temperature, MSL Level, Resolution, RoHS Status.
MAX199BCAI
✅ Drop-In📋 Alternatif referensi (tidak dalam katalog)
MAX199AEAI
✅ Drop-In📋 Alternatif referensi (tidak dalam katalog)
MAX199AEAI+
✅ Drop-In📋 Alternatif referensi (tidak dalam katalog)
MAX198ACAI
✅ Drop-In📋 Alternatif referensi (tidak dalam katalog)
MAX196ACAI
✅ Drop-InKontak untuk harga
Lihat Datasheet →MAX197ACAI+T
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Lihat Datasheet →MAX199ACAI Rating Maksimal & Karakteristik Listrik
| Resolusi | 12 bit |
| Number of Channels | 8 |
| Laju Pengambilan Sampel | 100 ksps |
| Analog Input Ranges | ±4V, ±2V, 0 to +4V, 0 to +2V |
| Tegangan Pemuat | +5 V (single) |
| Input Fault Protection | ±16.5 V |
| Internal Reference | 4.096 V |
| Digital Interface | 8+4 parallel |
| Suhu Kerja | 0°C to +70°C |
| Paket | 28-SSOP |
| Tipe Mounting | Surface Mount |
| Level MSL | 1 (unlimited) |
| Status RoHS | Compliant |
Konfigurasi Pin MAX199ACAI
| Pin produk 1 | AIN0 — Analog input channel 0 |
| Pin produk 2 | AIN1 — Analog input channel 1 |
| Pin produk 3 | AIN2 — Analog input channel 2 |
| Pin produk 4 | AIN3 — Analog input channel 3 |
| Pin produk 5 | AIN4 — Analog input channel 4 |
| Pin produk 6 | AIN5 — Analog input channel 5 |
| Pin produk 7 | AIN6 — Analog input channel 6 |
| Pin produk 8 | AIN7 — Analog input channel 7 |
| Pin produk 9 | AGND — Analog ground |
| Pin produk 10 | REF — Reference voltage (4.096V internal) / external reference input |
| Pin produk 11 | REFADJ — Reference adjust input |
| Pin produk 12 | VDD — +5V analog supply |
| Pin produk 13 | RANG0 — Range select bit 0 |
| Pin produk 14 | RANG1 — Range select bit 1 |
| Pin produk 15 | BIP — Bipolar / unipolar mode select |
| Pin produk 16 | DGND — Digital ground |
| Pin produk 17 | CLK — External clock input (or crystal connection) |
| Pin produk 18 | CS — Chip select (active low) |
| Pin produk 19 | WR — Write strobe (active low) |
| Pin produk 20 | RD — Read strobe (active low) |
| Pin produk 21 | INT — Interrupt output (active low) |
| Pin produk 22 | A0 — Address line 0 / channel select |
| Pin produk 23 | A1 — Address line 1 / channel select |
| Pin produk 24 | A2 — Address line 2 / channel select |
| Pin produk 25 | A3 — Address line 3 / channel select |
| Pin produk 26 | D0 — Data bit 0 (LSB) |
| Pin produk 27 | D1-D3 — Data bits 1-3 (4-bit bus mode) |
| Pin produk 28 | D4-D7 — Data bits 4-7 (8-bit bus mode) |
Aplikasi Umum
MAX199ACAI cocok untuk 6 aplikasis: 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.
Direkomendasikan
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.
Direkomendasikan
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.
Direkomendasikan
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.
Direkomendasikan
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.
Direkomendasikan
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.
Direkomendasikan
Ringkasan Produk Direkomendasikan
Data referensi engineering untuk MAX199ACAI — pembandingan, panduan desain, dan informasi konformitas.
Panduan Pemilihan
Pembandingan dengan Alternatif
| Parameter Umum | Produk Ini | 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 |
Diferensiator Kunci
- Lower-voltage input ranges suit modern low-voltage signal chains (vsMAX197ACAI)
- Standard-grade linearity sufficient for most industrial and instrumentation uses (vsMAX199BCAI)
- Commercial temperature grade optimized for cost-sensitive designs (vsMAX199AEAI+)
- Compact SSOP-28 footprint for space-constrained boards (vsMAX199AEWI)
Catatan Desain
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.
Informasi Konformitas
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.