MAX115EAX+ - 12-Bit 8-Input Simultaneous-Sampling ADC | Maxim
MPN: MAX115EAX+ ✓ ActiveMAX115EAX+ Overview
A data-acquisition system, or DAS, combines an analog-to-digital converter with the surrounding signal-conditioning and sampling functions needed to acquire multiple analog inputs. The MAX115EAX+ occupies the ADC/DAC category within integrated circuits and uses four track-and-hold amplifiers so that selected input pairs can be sampled simultaneously. Each of the eight inputs is organized as two four-channel banks, with two multiplexed inputs per amplifier.
Key features include 12-bit resolution, four simultaneous-sampling track-and-hold amplifiers, eight single-ended inputs, and 2 microsecond conversion time per channel. The parallel data interface supports direct connection to digital control and acquisition logic. The four-channel aggregate rate of 116 ksps makes the device useful for multichannel measurement systems in which paired signals must be captured close together in time.
Technically, the MAX115EAX+ uses a successive-approximation conversion architecture. Its track-and-hold front end captures the selected analog inputs before conversion, preserving the relationship between paired channels during simultaneous sampling. The parallel interface exposes the 12-bit conversion result without requiring a serial protocol. Exact input ranges, supply voltages, reference details, and digital logic levels are identified in the manufacturer datasheet.
Typical uses include industrial process monitoring, laboratory data acquisition, instrumentation, vibration analysis, and multichannel sensor acquisition. In a vibration test system, simultaneous sampling is valuable when the phase relationship between mechanical or electrical channels must be retained. In process monitoring, the eight-input structure can reduce the number of separate converter packages required when several analog measurements share a controller.
The primary design consideration is matching the sampling architecture to the signal relationship being measured. Simultaneous sampling improves channel-to-channel timing consistency, but applications that only need independent sequential readings should still evaluate acquisition latency, input bandwidth, and output timing. PCB layout should preserve clean analog grounding, provide local decoupling, and keep digital interface routing away from sensitive input paths.
This page consolidates the verified distributor descriptions, package information, throughput figures, application guidance, and available same-family alternatives. It also distinguishes documented parameters from information that still requires confirmation from the MAX115/MAX116 manufacturer datasheet.
Drop-in alternatives for MAX115EAX+ — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with MAX115EAX+ (same form factor and footprint) — differing in Package, Conversion Architecture, Internal Reference Voltage, Number of Channels, Resolution.
MAX115CAX+
✅ Drop-In📋 Reference alternative (not in catalog)
MAX115CAX
✅ Drop-InContact for price
View Datasheet →MAX116EAX+
✅ Drop-In ⚠️ Specs UnverifiedContact for price
View Datasheet →MAX115EAX+ Maximum Ratings & Electrical Characteristics
| ADC Resolution | 12 bit |
| Input Architecture | 2x4-channel simultaneous-sampling ADC |
| Total Single-Ended Inputs | 8 inputs |
| Track-and-Hold Amplifiers | 4 simultaneous-sampling amplifiers |
| Conversion Time | 2 us per channel |
| Throughput, 1 Channel | 390 ksps |
| Throughput, 2 Channels | 218 ksps |
| Throughput, 3 Channels | 152 ksps |
| Throughput, 4 Channels | 116 ksps |
| Conversion Architecture | Successive approximation |
| Data Interface | Parallel |
| Package | 36-pin SSOP |
| Package Terminal Count | 36 terminals |
| Package Shape | Rectangular gull-wing SSOP |
| Temperature Grade | Industrial |
| Internal Reference Voltage | +2.5 V |
| Reference Input | Buffered reference input |
| AEC-Q100 Qualification | Not applicable |
MAX115EAX+ rectangular gull-wing ssop Pin Configuration Guide
Pin configuration for MAX115EAX+ (rectangular gull-wing ssop package). This analog component features input, output, and power supply pins. Refer to the manufacturer datasheet for offset null, compensation, and enable pin configurations. Ideal for signal conditioning and amplifier circuits.
No detailed pinout data available for MAX115EAX+.
Refer to the datasheet for full pin configuration.
Typical Applications
MAX115EAX+ is suitable for 6 applications: Industrial Process Monitoring, Vibration Analysis, Laboratory Data Acquisition, Multichannel Sensor Acquisition, Power and Drive Monitoring, Communication and Control Interfaces.
Industrial Process Monitoring
The MAX115EAX+ is appropriate for industrial process-monitoring systems that must acquire several analog sensor outputs. Its eight single-ended input positions reduce the number of physical input channels required from eight separate converters, while four track-and-hold amplifiers allow selected measurements to be sampled together. The documented four-channel throughput is 116 ksps, and conversion time is 2 microseconds per channel. In a controller board, the parallel interface can feed a logic device or embedded processor, but designers should confirm logic levels and acquisition timing against the manufacturer datasheet. Analog input routing should be short, referenced to a quiet ground plane, and isolated from switching-power stages to avoid coupling process-control transients into the measurement nodes.
Vibration Analysis
The MAX115EAX+ fits multichannel vibration analysis where the phase relationship between sensor signals must remain meaningful. Four simultaneous-sampling track-and-hold amplifiers capture four selected channels at the same acquisition instant, which is more valuable than using unrelated converters with staggered sample timing. The converter delivers 12-bit results at 116 ksps aggregate when all four channels are active and requires 2 microseconds per channel conversion. A practical implementation would amplify accelerometer outputs close to the converter and route them through short, shielded analog traces. Engineers should verify the usable input bandwidth, common-mode range, acquisition settling behavior, and anti-aliasing requirements before selecting external gain and filter components.
Laboratory Data Acquisition
The MAX115EAX+ can serve as the central converter in a laboratory data-acquisition instrument that measures multiple low-bandwidth analog nodes. Eight single-ended inputs provide enough channels for sensors, status lines, or reference measurements within one instrument, while the 36-pin SSOP package supports conventional surface-mount PCB assembly. At full four-channel operation, the verified aggregate rate is 116 ksps, while one-channel operation reaches 390 ksps. The parallel output allows the host controller to capture data without a serial protocol, although software timing and bus-width requirements must be considered. For precise laboratory results, use a stable reference arrangement, bypass capacitors placed close to the device, and separate analog and digital return paths according to the datasheet layout guidance.
Multichannel Sensor Acquisition
The MAX115EAX+ is suitable for compact multichannel sensor interfaces requiring more input capacity than a single-channel ADC. Two four-channel input banks provide eight single-ended measurement positions, and each bank feeds two multiplexed track-and-hold amplifiers. This arrangement is useful for temperature, pressure, position, and resistance-network sensing when related channels should be captured in a controlled sequence. The 12-bit conversion resolution and 2 microsecond per-channel conversion time support general-purpose measurement, while the one-channel maximum of 390 ksps provides additional speed when only one signal is active. The key design tradeoff is that the multiplexed structure does not continuously sample every input at the same instant; only the four selected track-and-hold channels are simultaneous.
Power and Drive Monitoring
The MAX115EAX+ can monitor several analog feedback or diagnostic nodes in a power-control or drive system. Simultaneous sampling of four selected channels helps compare related voltages within one acquisition window, while eight input positions reduce the need for multiple converter packages. At four active channels, the documented aggregate throughput is 116 ksps, which is suitable for supervisory and control-loop measurements whose bandwidth does not require the 390 ksps single-channel rate. The converter should be powered and referenced according to the manufacturer specifications, while high-energy switching nodes should be conditioned rather than connected directly. Engineers must confirm the absolute input range, source impedance, settling time, and any required protection network before using the ADC on power-stage feedback signals.
Communication and Control Interfaces
The MAX115EAX+ can acquire analog supervisory signals in communication equipment, industrial controllers, or embedded control modules where several status or conditioning signals must feed a digital controller. Its parallel 12-bit interface avoids imposing a serial data protocol, and the 36-pin SSOP package provides a defined surface-mount footprint for multichannel acquisition boards. The four simultaneous channels are useful when signals are correlated, such as forward and reverse measurements or redundant sensor pairs, while the remaining four positions expand the board's general-purpose input count. The maximum documented rates range from 390 ksps for one channel to 116 ksps for four. Before layout approval, verify data-bus timing, logic thresholds, input settling, grounding, and decoupling directly from the MAX115/MAX116 manufacturer datasheet.
Engineering reference data for MAX115EAX+ — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | MAX115CAX+ | MAX115CAX | MAX116EAX+ |
|---|---|---|---|---|
| Package | 36-pin SSOP | 36-pin SSOP | 36-pin SSOP | 36-pin SSOP |
| Brand | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated |
Key Differentiators
- Four selected channels share the same sampling instant (vs MAX116EAX+)
- Clearly documented multichannel throughput scaling (vs MAX115CAX+)
- Eight single-ended inputs in one 36-pin SSOP (vs MAX115CAX)
Design Notes
Route the eight analog inputs away from the parallel digital outputs and switching-regulator stages. The verified architecture uses multiplexed pairs feeding four track-and-hold amplifiers, so source impedance, input settling, and channel-to-channel coupling directly affect conversion accuracy. Use the MAX115/MAX116 datasheet reference layout and preserve a continuous ground plane beneath the analog section. Place input filtering and protection close to the source or connector, and maintain symmetric routing where paired sensors are sampled together.
Account for simultaneous switching of the 12-bit parallel interface when laying out the board. Fan the data lines away from sensitive input traces, use a continuous reference plane, and place the digital driver or receiving logic in a controlled location. The supplied data does not provide the complete logic thresholds or timing diagrams, so bus timing and signal-integrity margins must be taken from the manufacturer datasheet rather than estimated.
Do not interpret 390 ksps as the simultaneous rate for all eight inputs. The verified throughput decreases to 218 ksps for two channels, 152 ksps for three channels, and 116 ksps for four channels. Only four track-and-hold amplifiers provide simultaneous sampling, while the remaining channels are multiplexed. Choose the operating mode according to the timing relationship required by the measurement and verify acquisition timing against the manufacturer specification.
Use the manufacturer-specified supply and reference arrangements, including the documented +2.5 V internal reference and buffered reference input. Place required bypass components at the associated pins with the shortest possible return path. Supply and reference noise can affect ADC code stability even when the signal source is quiet. Exact capacitor values and allowable source impedance are not present in the supplied search data and must be taken directly from the MAX115/MAX116 datasheet.
Compliance Information
The supplied search results do not contain explicit environmental-compliance declarations for MAX115EAX+. AEC-Q100 is not applicable because the device is a general-purpose industrial data-acquisition IC.
