MAX1178BCUP+ - 16-Bit 135ksps Bipolar ADC ±5V | Maxim Integrated
MPN: MAX1178BCUP+ ✓ פעילMAX1178BCUP+ סקירה
A SAR ADC is a successive-approximation-register converter, a category of medium-speed, low-latency analog-to-digital converters that perform one conversion per sample clock by stepping an internal DAC against the input through a binary-search algorithm. SAR ADCs sit between delta-sigma ADCs (which offer higher resolution at lower speed) and flash ADCs (which offer maximum speed at lower resolution), and they are widely used in industrial control, instrumentation, and data-acquisition front-ends where deterministic latency matters.
Key features include ±5 V true bipolar input range on a single +4.2 V supply, automatic power-down that drops supply current to 0.4 mA at 10 ksps, 16-bit no-missing-codes performance, single-ended analog input with track-and-hold, and SPI/QSPI/MICROWIRE-compatible serial output. The MAX1178 family differs from the MAX1188 (±10 V input) and MAX1177 (±3 V input) by accepting the wider ±5 V bipolar input on the same TSSOP-20 footprint.
Typical applications include industrial process control, data-acquisition front-ends for ±5 V sensor signals, weigh scales, vibration and motion analysis, and portable or battery-powered instrumentation. The AutoShutdown feature reduces system power by more than 90% in between-sample idle windows.
When designing with this ADC, pay attention to the input clamping network for over-voltage protection and the reference decoupling scheme - the internal reference requires a low-ESR bypass cap of 4.7 µF or larger. For full ±5 V input swing, an external negative rail or a bipolar-input drive circuit is required at the analog input pin.
This page synthesizes distributor pricing, parametric drop-in alternatives, and practical design notes for the MAX1178BCUP+ that are not contained in the manufacturer datasheet alone.
חלופות תחליף ישיר עבור MAX1178BCUP+ — אותו מארז, תואם פין-לפין. חלקים במארז שונה הדורשים עיבוד מחדש של ה-PCB אינם נכללים.
וריאנטים בסדרה זו
דגמים מאותה סדרה התואמים Drop-in עם MAX1178BCUP+ (אותו גורם צורה וטביעת רגל) — שונים ב Resolution.
MAX1178BCUP+T
✅ Drop-In📋 חלופה להתייחסות (לא בקטלוג)
MAX1178ACUP+
✅ Drop-In📋 חלופה להתייחסות (לא בקטלוג)
MAX1177CCUP+T
✅ Drop-Inצור קשר לקבלת מחיר
הצג גיליון נתונים ←MAX1188BCUP+
✅ Drop-In📋 חלופה להתייחסות (לא בקטלוג)
MAX1081BCUP+
✅ Drop-In📋 חלופה להתייחסות (לא בקטלוג)
LTC1865ACMS
✅ Drop-In📋 חלופה להתייחסות (לא בקטלוג)
MAX1178BCUP+ דירוגים מרביים ומאפיינים חשמליים
| רזולוציה | 16 bit |
| Number of Inputs | 1 |
| Converter Type | SAR (Successive Approximation) |
| קצב דגימה | 135 ksps |
| Analog Input Range (Bipolar) | ±5 V |
| Supply Voltage (Analog) | +4.2 V nominal |
| Internal Reference Voltage | +4.096 V |
| Power Consumption (External Ref, 135 ksps) | 26.5 mW typ |
| Power Consumption (Internal Ref, 135 ksps) | 31 mW typ |
| AutoShutdown Current | 0.4 mA at 10 ksps |
| ממשק | SPI / QSPI / MICROWIRE serial |
| Input Configuration | Single-ended with track-and-hold |
| מארז | 20-TSSOP (4.40 mm) |
| סטטוס RoHS | Compliant |
| Clock | Internal factory-trimmed |
תצורת פינים של MAX1178BCUP+
| פין 1 | AVDD — Analog supply voltage (+4.2 V nominal) |
| פין 2 | AIN — Analog input, bipolar ±5 V |
| פין 3 | REF — Reference input/output |
| פין 4 | AGND — Analog ground |
| פין 5 | DGND — Digital ground |
| פין 6 | DOUT — Serial data output |
| פין 7 | SSTRB — Serial strobe output |
| פין 8 | CS — Chip select, active low |
| פין 9 | SCLK — Serial clock input |
| פין 10 | DVDD — Digital supply voltage |
| פין 11 | NC — Not connected (per datasheet) |
| פין 12 | NC — Not connected (per datasheet) |
| פין 13 | NC — Not connected (per datasheet) |
| פין 14 | NC — Not connected (per datasheet) |
| פין 15 | NC — Not connected (per datasheet) |
| פין 16 | NC — Not connected (per datasheet) |
| פין 17 | NC — Not connected (per datasheet) |
| פין 18 | NC — Not connected (per datasheet) |
| פין 19 | NC — Not connected (per datasheet) |
| פין 20 | NC — Not connected (per datasheet) |
יישומים טיפוסיים
MAX1178BCUP+ מתאים עבור 7 יישוםs: Industrial Process Control, Data Acquisition Systems, Weigh Scales and Force Measurement, Vibration and Motion Analysis, Portable Battery-Powered Instrumentation, Medical Patient Monitoring, Audio Bandwidth Digital Sampling.
Industrial Process Control
The MAX1178BCUP+ is well-suited for industrial process-control front-ends that digitize ±5 V analog signals from PLCs, transducers and 4-20 mA loop receivers (after resistor scaling). Its 16-bit resolution across ±5 V gives 152 µV per LSB, sufficient to resolve small process-variable changes without front-end gain stages. The AutoShutdown feature cuts supply current to 0.4 mA at 10 ksps, enabling multi-channel multiplexed systems where only one ADC is sampled at a time. The internal +4.096 V reference simplifies the BOM count and PCB area.
מומלץ
Data Acquisition Systems
For multi-channel data-acquisition boards, the MAX1178BCUP+ provides a compact, low-power single-channel SAR ADC with SPI serial output that easily daisy-chains to a microcontroller or FPGA. The 135 ksps throughput handles most industrial and instrumentation sampling requirements, while the internal factory-trimmed clock removes the need for an external clock source. Combined with an external MUX like the MAX4638, this ADC supports up to 8-32 channels in a compact footprint with deterministic latency from the SAR architecture.
מומלץ
Weigh Scales and Force Measurement
Weigh-scale and force-measurement systems require 16-bit (or better) resolution to span the load-cell dynamic range, and the MAX1178BCUP+ delivers that with ±5 V input to match typical bridge-amplifier outputs. The 135 ksps rate is more than enough for 100 Hz scale settling rates, leaving timing headroom for digital filtering and temperature drift compensation. The internal reference reduces BOM cost and improves temperature stability compared to most external shunt references.
מומלץ
Vibration and Motion Analysis
Vibration and motion-analysis front-ends need medium sampling rates (50-100 ksps per channel) with low latency, which is exactly what the MAX1178BCUP+ SAR architecture provides. The SPI interface allows the ADC to be placed close to MEMS accelerometers or IEPE piezoelectric sensors without long analog traces, reducing EMI. Combined with anti-alias filters placed at the ADC input pin, this part supports three or four channels of motion data at 50 ksps each from a single ADC and external MUX.
מומלץ
Portable Battery-Powered Instrumentation
Portable, battery-powered instruments benefit from the MAX1178BCUP+ AutoShutdown mode, which drops supply current to 0.4 mA at 10 ksps - a 90% reduction versus continuous conversion. The single +4.2 V analog supply runs directly from a single lithium-ion cell, eliminating split-rail DC-DC converters in handheld multimeters, data loggers and field instruments. The internal clock further reduces BOM cost and standby power. The 20-TSSOP footprint keeps the ADC small enough to fit in handheld enclosures.
מומלץ
Medical Patient Monitoring
Patient monitoring and diagnostic equipment require deterministic latency for waveform capture, and the MAX1178BCUP+ SAR architecture provides sample-on-demand conversion with no pipeline delay. Its ±5 V bipolar input matches the output range of ECG, EEG and pulse-oximeter front-ends. The internal +4.096 V reference keeps calibration stable over the device's commercial temperature range, which is sufficient for bedside monitors. SPI output streams data directly into the host MCU for heart-rate, SpO2 and temperature algorithms.
מומלץ
Audio Bandwidth Digital Sampling
Audio-bandwidth digital sampling systems (digital-crossover, room-correction, and effects processors) can use the MAX1178BCUP+ for >90 dB SNR analog-to-digital conversion at 135 ksps, sufficient for 48 kHz and 96 kHz audio sample rates. The ±5 V input accommodates professional +4 dBu and -10 dBV consumer audio line levels after a fixed gain stage. The internal reference gives low-jitter, low-noise performance that preserves audio dynamic range without the cost of an external audio-grade reference.
מומלץ
סיכום מוצרים מומלצים
נתוני עזר הנדסיים עבור MAX1178BCUP+ — השוואה, הנחיות תכנון ומידע על תאימות.
מדריך בחירה
השוואה עם חלופות
| פרמטר | מוצר זה | MAX1178BCUP+T | MAX1178ACUP+ | MAX1177CCUP+T | MAX1188BCUP+ | MAX1081BCUP+ |
|---|---|---|---|---|---|---|
| Brand | Analog Devices (Maxim Integrated) | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Package | 20-TSSOP | 20-TSSOP - same | 20-TSSOP - same | 20-TSSOP - same | 20-TSSOP - same | 20-TSSOP - same |
| Resolution | 16 bit | 16 bit | 16 bit | 16 bit | 16 bit | 14 bit |
| Internal Reference | +4.096 V | +4.096 V | +4.096 V | +2.5 V | +4.096 V | +2.5 V |
| Interface | SPI / QSPI / MICROWIRE | SPI / QSPI / MICROWIRE | SPI / QSPI / MICROWIRE | SPI / QSPI / MICROWIRE | SPI / QSPI / MICROWIRE | Serial |
מבדילים עיקריים
- True bipolar ±5 V input on a single +4.2 V supply (לעומתMAX1167 (single-supply, unipolar))
- 135 ksps throughput with AutoShutdown (לעומתMAX1162 (200 ksps, no AutoShutdown))
- Pin-compatible family for ±3 V / ±5 V / ±10 V ranges (לעומתAD7606 (different package, simultaneous sampling))
הערות תכנון
The MAX1178BCUP+ runs on a single +4.2 V analog supply and supports AutoShutdown that brings supply current down to 0.4 mA at 10 ksps. Decouple AVDD and DVDD separately at the IC pins with a 10 µF tantalum in parallel with a 0.1 µF ceramic. The internal +4.096 V reference requires at least 4.7 µF of low-ESR capacitance on the REF pin; less capacitance causes excessive reference noise and degraded AC performance.
For full ±5 V bipolar input swing, the analog input must be biased to the midpoint of the ADC's input common-mode range - typically achieved with an input driver op-amp that swings around AVDD/2. Add a small RC anti-alias filter (typically 100 Ω + 1 nF) right at the AIN pin to limit out-of-band noise. Keep analog input traces away from digital clock and serial data lines to avoid digital noise coupling into the analog front-end.
Do not assume the MAX1178's ±5 V input is true bipolar at the pin - the bipolar range is implemented on a single +4.2 V analog supply, so the input signal must be biased to AVDD/2 externally. Forgetting this level shift is the #1 cause of clipped or distorted output codes. Also confirm that SSTRB timing is respected in SPI firmware - early SCLK toggles during conversion can corrupt the SAR state machine.
Use a separate analog ground plane tied to a single point at the AGND pin to avoid ground-loop noise. Place REF decoupling cap directly at the REF pin with short, wide traces. Route AIN as a guarded trace surrounded by AGND to reject common-mode pickup. The CS, SCLK, and DOUT lines should be 50 Ω-controlled-impedance traces if longer than ~25 mm to the host MCU.
מידע על תאימות
RoHS and lead-free per Maxim Integrated product marking. Halogen-free status not specified in retrieved data.
