Part A
AD4115BCPZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 6823 PCS
- Series
- Data Acquisition - Analog to Digital Converters (ADC)
Replacement verdict
Compatible functional replacement candidate
The AD4111BCPZ and AD4115BCPZ are both 24-bit sigma-delta ADCs in the same 40-lead LFCSP package with identical supply rails and serial interface, making them strong functional replacement candidates. However, the AD4111BCPZ integrates dedicated current-channel inputs and open-wire detection, while the AD4115BCPZ provides a higher number of fully differential voltage channels. Designers must validate channel configuration, input signal conditioning, and system calibration before substituting one for the other in a given application.
Channel Count and Input Type
Validation required
Resolution and Accuracy
High match
Package and Pinout
High match
Integrated Features
Validation required
Parts at a glance
Part B
AD4111BCPZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 3288 PCS
- Package
- VFQFN-40
- Series
- Data Acquisition - Analog to Digital Converters (ADC)
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | AD4111BCPZ | AD4115BCPZ | Why it matters |
|---|---|---|---|
| Number of Input Channels | 4 differential / 8 single-ended | 8 differential / 16 single-ended | Determines how many analog signals can be measured simultaneously, directly affecting system channel density and whether the part can substitute in multi-channel designs. |
| ADC Architecture | Sigma-Delta (24-bit) | Sigma-Delta (24-bit) | Both use the same conversion principle, so noise shaping and resolution behavior are similar, aiding functional substitutability. |
| Input Voltage Range | ±10 V (with integrated resistor divider) | ±10 V (with integrated resistor divider) | Matching input ranges ensures the same sensor or signal source can be connected without external conditioning changes. |
| Current Input Support | Yes (0–20 mA / 4–20 mA) | No | Current input capability is critical for industrial loop-powered sensors; its absence in the AD4115BCPZ prevents direct substitution in current-loop applications. |
| Voltage Reference | Internal 2.5 V, ±0.12% initial accuracy | Internal 2.5 V, ±0.12% initial accuracy | A stable internal reference reduces external component count and ensures consistent absolute accuracy across both parts. |
| Interface | SPI (serial) | SPI (serial) | Identical digital interface simplifies firmware and host controller compatibility when swapping parts. |
| Package | 40-lead LFCSP (6 mm × 6 mm) | 40-lead LFCSP (6 mm × 6 mm) | Same footprint and pin count allow drop-in PCB replacement without layout changes. |
| Supply Voltage (AVDD) | 4.5 V to 5.5 V | 4.5 V to 5.5 V | Compatible supply requirements mean the same power rail can be used for either device. |
| Operating Temperature Range | −40°C to +105°C | −40°C to +105°C | Identical temperature ratings ensure both parts suit the same industrial and harsh-environment applications. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD4115BCPZ | AD4111BCPZ |
|---|---|---|
| Part Status | Active | Active |
| Base Product Number | AD4115 | - |
| Number of Bits | 24 | 24 |
| Sampling Rate (Per Second) | 125k | - |
| Number of Inputs | 8, 16 | 4, 8 |
| Input Type | Differential, Single Ended | Differential, Single Ended |
| Data Interface | DSP, MICROWIRE™, QSPI™, and SPI™ | Serial, SPI |
| Configuration | MUX-ADC | MUX-S/H-ADC |
| Ratio - S / H: ADC | 0:1 | 0:1 |
| Number of A / D Converters | 1 | - |
| Architecture | Sigma-Delta | Sigma-Delta |
| Reference Type | External, Internal | External, Internal |
| Voltage - Supply, Analog | 4.5V ~ 5.5V | 2V ~ 5.5V |
| Voltage - Supply, Digital | 2V ~ 5.5V | 2V ~ 5.5V |
| Features | Temperature Sensor | Internal Oscillator, Temperature Sensor |
| Operating Temperature | -40°C ~ 105°C | -40°C ~ 105°C |
| Mounting Type | Surface Mount | - |
| Packaging | Tray | - |
| Sampling Rate(Per Second) | - | 6.2k |
| Number of A/D Converters | - | 1 |
Frequently asked questions
What are the primary differences between the AD4111BCPZ and AD4115BCPZ?
The AD4111BCPZ is a low power, 24-bit, sigma-delta ADC with ±10 V and 0-10 V inputs, featuring open wire detection and an integrated ±10 V reference. The AD4115BCPZ is a 24-bit, sigma-delta ADC with ±10 V inputs, offering a faster maximum output data rate of 125 kSPS and a wider input common-mode range, but it does not include the open wire detection or the integrated ±10 V reference found in the AD4111.
Are the AD4111BCPZ and AD4115BCPZ pin-compatible?
No, they are not pin-compatible. The AD4111BCPZ is available in a 40-lead LFCSP (6 mm × 6 mm) package, while the AD4115BCPZ is available in a 48-lead LFCSP (7 mm × 7 mm) package. The different package sizes and pin counts prevent direct PCB footprint compatibility.
Can the AD4111BCPZ and AD4115BCPZ operate from the same power supply voltages?
Yes, both devices support similar analog and digital supply ranges. The AD4111BCPZ operates from a single 3.3 V or 5 V analog supply and a 2.7 V to 5.5 V digital supply. The AD4115BCPZ operates from a 4.5 V to 5.5 V analog supply and a 2.7 V to 5.5 V digital supply. Designers should verify the exact supply requirements in the respective datasheets.
Which device offers a higher maximum output data rate?
The AD4115BCPZ offers a higher maximum output data rate of 125 kSPS, whereas the AD4111BCPZ has a maximum output data rate of 31.25 kSPS. This makes the AD4115BCPZ more suitable for applications requiring faster sampling.
Does the AD4111BCPZ include open wire detection that the AD4115BCPZ lacks?
Yes, the AD4111BCPZ includes open wire detection capability, which is not available on the AD4115BCPZ. This feature allows the AD4111BCPZ to detect broken or disconnected sensor wires in industrial control applications.
What is the input common-mode range for each device?
The AD4111BCPZ has a specified input common-mode range of ±10 V. The AD4115BCPZ offers a wider input common-mode range, which is specified in its datasheet as ±10 V plus additional headroom, allowing more flexibility in high-voltage industrial signal chains. Exact limits should be confirmed from the manufacturer datasheets.
Do both devices integrate a precision voltage reference?
No. The AD4111BCPZ integrates a ±10 V precision voltage reference, while the AD4115BCPZ does not include an integrated reference and requires an external reference for operation. This difference affects system cost and board space.
Which device is better suited for low power applications?
The AD4111BCPZ is designed for low power operation, making it better suited for power-sensitive applications. The AD4115BCPZ, with its higher speed capability, typically consumes more power. Designers should compare the exact supply current and power dissipation specifications in the respective datasheets for their target data rate.