Part A
AD7715ARZ-5
Analog Equipment GmbH.
- Lifecycle
- Active
- Stock
- 2795 PCS
- Package
- SOP-16
- Series
- Acquisition de données - Convertisseur analogique - numérique (ADC)
Replacement verdict
Not a drop-in replacement
The AD7715ARZ-5 and AD7718BRU are not drop-in replacements for one another. The AD7715ARZ-5 is a single-channel 16-bit sigma-delta ADC in a 16-lead SOIC package, while the AD7718BRU is an 8/10-channel 24-bit sigma-delta ADC in a 28-lead TSSOP package. They differ in channel count, resolution, package footprint, and supply voltage range, so a direct board-level substitution is not possible without redesign.
Different channel count
Different resolution
Different package footprint
Different supply voltage range
Parts at a glance
Part B
AD7718BRU
Analog Equipment GmbH.
- Lifecycle
- Active
- Stock
- 5804 PCS
- Package
- TSSOP-28
- Series
- Acquisition de données - Convertisseur analogique - numérique (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 | AD7715ARZ-5 | AD7718BRU | Why it matters |
|---|---|---|---|
| Resolution (bits) | 16 | 24 | Higher resolution enables finer measurement of small signal changes, which is critical for precision sensing applications. |
| Number of ADC Input Channels | 1 (differential) | 8 (4 differential / 8 single-ended) | Channel count determines how many sensors or signal sources can be connected without external multiplexing. |
| Sampling Rate (max) | 500 SPS | 1.365 kSPS | Maximum throughput affects how fast the system can capture changing signals and the achievable update rate. |
| Interface Type | SPI / QSPI / MICROWIRE / DSP (3-wire serial) | SPI / QSPI / MICROWIRE / DSP (3-wire serial) | Serial interface compatibility determines whether the part can drop into an existing digital bus without redesign. |
| Supply Voltage (analog) | 5 V | 2.7 V to 3.6 V (or 5 V via AVDD) | Analog supply range must match the system rail; a mismatch can require level shifting or a different power design. |
| Package | 16-lead SOIC (R-16) | 28-lead TSSOP (RU-28) | Package footprint and pin count affect PCB layout, board space, and mechanical compatibility. |
| On-chip PGA | Yes (gain 1 to 128) | Yes (gain 1 to 128) | A programmable gain amplifier allows direct connection of low-level sensors without external signal conditioning. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Temperature range must cover the target environment for reliable operation and regulatory compliance. |
| Power Consumption (typical) | ~1.5 mW (at 3 V, 500 SPS) | ~3.5 mW (at 3 V) | Power draw impacts battery life and thermal budget in portable and low-power instrumentation designs. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD7715ARZ-5 | AD7718BRU |
|---|---|---|
| Supplier | - | Analog Devices Inc.,Rochester Electronics, LLC |
| Part Status | Active | Obsolete |
| Number of Bits | 16 | 24 |
| Sampling Rate(Per Second) | 500 | 1.37k |
| Number of Inputs | 1 | 4/5, 8/10 |
| Input Type | Differential | Differential, Pseudo-Differential |
| Data Interface | SPI, DSP | SPI, DSP |
| Configuration | PGA-ADC | MUX-PGA-ADC |
| Number of A/D Converters | 1 | 1 |
| Architecture | Sigma-Delta | Sigma-Delta |
| Reference Type | External | External |
| Voltage - Supply, Analog | 5V | 2.7V ~ 3.6V, 5V |
| Voltage - Supply, Digital | 3V ~ 5.25V | 2.7V ~ 3.6V, 5V |
| Features | PGA | PGA |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
Frequently asked questions
What are the primary differences between the AD7715ARZ-5 and the AD7718BRU?
The AD7715ARZ-5 is a single-channel, 16-bit sigma-delta ADC with a maximum output rate of 500 Hz, housed in a 16-lead SOIC package, and specified for a 5 V supply. The AD7718BRU is an 8/10-channel, 24-bit sigma-delta ADC with a maximum output rate of 1.365 kSPS, housed in a 28-lead TSSOP package, and operates from a 2.7 V to 5.25 V supply. The AD7718BRU also integrates a programmable gain amplifier and an on-chip oscillator, whereas the AD7715ARZ-5 requires an external clock source.
Can the AD7715ARZ-5 be used as a drop-in replacement for the AD7718BRU?
No. The two devices differ in package footprint (16-lead SOIC vs 28-lead TSSOP), pin count, pin functions, channel count, resolution, and supply requirements. A direct drop-in replacement is not possible; a PCB redesign and firmware changes would be required.
What are the resolution and output rate specifications for each device?
The AD7715ARZ-5 provides 16-bit resolution with a maximum output update rate of 500 Hz. The AD7718BRU provides up to 24-bit resolution (no missing codes) with a maximum output update rate of 1.365 kSPS. The AD7718BRU offers higher resolution and a faster maximum output rate than the AD7715ARZ-5.
How do the supply voltage requirements of the AD7715ARZ-5 and AD7718BRU compare?
The AD7715ARZ-5 is specified for operation from a single 5 V supply (the -5 suffix denotes the 5 V version). The AD7718BRU operates from a single supply of 2.7 V to 5.25 V, giving it greater flexibility for lower-voltage systems.
How many input channels does each device support?
The AD7715ARZ-5 is a single-channel (one differential input pair) sigma-delta ADC. The AD7718BRU provides 8/10 input channels, configurable as either pseudo-differential or fully differential inputs, making it suitable for multi-channel measurement systems.
Do both devices include a programmable gain amplifier (PGA)?
Yes. Both the AD7715ARZ-5 and the AD7718BRU integrate a programmable gain amplifier. The AD7715ARZ-5 offers selectable gains of 1, 2, 32, and 128. The AD7718BRU offers selectable gains of 1, 2, 4, 8, 16, 32, 64, and 128, providing a wider gain range.
What clock source does each device require?
The AD7715ARZ-5 requires an external clock source (typically a crystal or clock signal applied to the MCLK IN pin). The AD7718BRU includes an on-chip oscillator and can also be driven by an external clock, offering more flexibility in system design.
What are the package and pin count differences between the two devices?
The AD7715ARZ-5 is supplied in a 16-lead SOIC package. The AD7718BRU is supplied in a 28-lead TSSOP package. The difference in pin count and package type means the two devices are not footprint-compatible and require different PCB land patterns.