Part A
AD7710ARZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 4329 Stückzahl
- Package
- SOIC-24
- Series
- Datenerfassung mit Analog to Digital Converters (ADC)
Replacement verdict
Compatible functional replacement candidate
The AD7711AAR is a functional replacement candidate for the AD7710ARZ, sharing the same 24-bit sigma-delta ADC architecture, 24-pin SOIC package, and comparable supply and temperature ranges. However, the AD7711AAR integrates a programmable current source for RTD excitation and differs in its input signal conditioning, so the replacement requires validation against the specific sensor interface and input configuration of the target design.
Resolution and ADC Architecture
High match
Package Type
High match
Input Signal Conditioning
Validation required
On-Chip Excitation Current Source
Validation required
Parts at a glance
Part B
AD7711AAR
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 7773 Stückzahl
- Package
- SOIC-24
- Series
- Datenerfassung mit 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 | AD7710ARZ | AD7711AAR | Why it matters |
|---|---|---|---|
| Resolution (bits) | 24 | 24 | Both are 24-bit sigma-delta ADCs, so resolution is equivalent for high-precision measurement applications. |
| Number of input channels | 2 (differential) | 2 (differential) | Channel count determines how many signal sources can be measured; both offer two differential inputs. |
| On-chip PGA gain range | 1 to 128 | 1 to 128 | Programmable gain allows direct interfacing with low-level sensors; identical ranges mean similar signal conditioning flexibility. |
| Integrated current sources | No | Yes (2 matched 200 µA) | On-chip excitation current sources simplify RTD and bridge sensor designs; the AD7711AAR includes them while the AD7710ARZ does not. |
| Interface type | Serial (SPI/QSPI/MICROWIRE compatible) | Serial (SPI/QSPI/MICROWIRE compatible) | Both use a bidirectional serial interface, so microcontroller connectivity is functionally equivalent. |
| Supply voltage (analog) | 5 V (single) or ±5 V (dual) | 5 V (single) or ±5 V (dual) | Supply requirements affect system power design; both support the same analog supply configurations. |
| Package | 24-lead SOIC (wide) | 24-lead SOIC (wide) | Package compatibility determines PCB footprint interchangeability; both use the same 24-lead wide SOIC. |
| Operating temperature range | -40 °C to +85 °C | -40 °C to +85 °C | Temperature range affects suitability for industrial environments; both cover the standard industrial range. |
| Reference input | External differential reference | External differential reference | Both require an external reference, so system reference design is the same for either part. |
Need help validating a replacement?
Send your BOM and application constraints for technical and sourcing review.
Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD7710ARZ | AD7711AAR |
|---|---|---|
| Supplier | - | Analog Devices Inc.,Rochester Electronics, LLC |
| Part Status | Active | Obsolete |
| Number of Bits | 24 | 24 |
| Sampling Rate(Per Second) | 1k | 1k |
| Number of Inputs | 2 | 2 |
| Input Type | Differential | Differential |
| Data Interface | SPI | SPI |
| Configuration | MUX-PGA-ADC | MUX-PGA-ADC |
| Number of A/D Converters | 1 | 1 |
| Architecture | Sigma-Delta | Sigma-Delta |
| Reference Type | External, Internal | External, Internal |
| Voltage - Supply, Analog | 5V ~ 10V | 5V ~ 10V |
| Voltage - Supply, Digital | 5V | 5V |
| Features | PGA | PGA |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
Frequently asked questions
What are the primary functional differences between the AD7710ARZ and the AD7711AAR?
The AD7710ARZ is a 24-bit sigma-delta ADC with two differential input channels and an on-chip programmable gain amplifier (PGA). The AD7711AAR is also a 24-bit sigma-delta ADC but includes a single differential input channel with a PGA and an on-chip RTD excitation current source, making it specifically suited for RTD temperature sensing applications.
Are the AD7710ARZ and AD7711AAR pin-compatible?
No. Both devices are offered in a 24-lead SOIC package, but their pin functions differ. The AD7711AAR includes dedicated RTD excitation current output pins and a different input multiplexer configuration, so the pinouts are not interchangeable. PCB layout must follow the respective datasheet pin descriptions.
Can the AD7711AAR be used as a direct drop-in replacement for the AD7710ARZ?
No. Although both are 24-bit sigma-delta ADCs in 24-lead SOIC packages, the AD7711AAR has a single differential input channel plus RTD excitation current sources, while the AD7710ARZ provides two differential input channels. Pin functions, input architecture, and external component requirements differ, so a direct drop-in substitution is not supported without design validation.
What is the resolution and output data rate of both devices?
Both the AD7710ARZ and AD7711AAR provide 24-bit no-missing-code resolution. Their output data rates are programmable via the on-chip control register, with update rates typically ranging from approximately 10 Hz to 1 kHz depending on the selected gain and filter settings, as specified in the respective Analog Devices datasheets.
Do both devices include an on-chip programmable gain amplifier (PGA)?
Yes. Both the AD7710ARZ and AD7711AAR integrate a programmable gain amplifier with gain settings of 1, 2, 4, 8, 16, 32, 64, and 128, allowing direct interfacing with low-level transducer signals without external amplification.
Which device is better suited for RTD temperature measurement applications?
The AD7711AAR is better suited for RTD applications because it integrates matched excitation current sources specifically designed for RTD excitation, along with a single differential input channel and PGA. The AD7710ARZ lacks these dedicated RTD excitation current sources and is more general-purpose with two differential input channels.
What interface do the AD7710ARZ and AD7711AAR use for communication with a microcontroller?
Both devices use a serial interface compatible with SPI and QSPI protocols for configuration and data readout. They feature a bidirectional serial data line, serial clock, and chip select, allowing direct connection to most microcontrollers and DSPs.
What are the supply voltage requirements for the AD7710ARZ and AD7711AAR?
Both devices operate from a dual supply configuration with an analog supply (AVDD) and a digital supply (DVDD). Typical operating voltages are 5 V for AVDD and 5 V for DVDD, with the analog input range and reference voltage settings defined in the respective datasheets. Designers should verify exact supply limits and decoupling requirements from the official Analog Devices documentation.