Part A
AD7710ARZ
テキサス・インスツルメンツ
- Lifecycle
- Active
- Stock
- 4329 個数
- Package
- SOIC-24
- Series
- データ取得 - アナログ/デジタルコンバータ (ADC)
Replacement verdict
Compatible functional replacement candidate
The AD7710ARZ and AD7711AR are both 24-bit sigma-delta signal-conditioning ADCs from Analog Devices in a 24-lead SOIC package, sharing a similar core architecture and serial interface. However, they differ in on-chip PGA gain range, reference input configuration, and available current sources, so the AD7711AR is a functional candidate rather than a guaranteed drop-in replacement. Engineers should validate PGA gain requirements, reference drive, and excitation-current needs against the target design before substituting.
Resolution and ADC Architecture
High match
Package Type
High match
Programmable Gain Amplifier Range
Validation required
On-Chip Current Sources and Reference Configuration
Validation required
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 | AD7711AR | 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 of low-level sensors without external amplification. |
| Integrated current sources | No | Yes (2 matched current sources) | On-chip excitation current sources simplify RTD and resistive sensor designs; the AD7711 includes them while the AD7710 does not. |
| Interface type | Serial (SPI/QSPI/MICROWIRE compatible) | Serial (SPI/QSPI/MICROWIRE compatible) | Serial interface compatibility ensures similar microcontroller connectivity for both parts. |
| Supply voltage (analog) | 5 V (single) or ±5 V (dual) | 5 V (single) or ±5 V (dual) | Supply requirements affect system power design and signal range; both support single or dual supplies. |
| Package | 24-lead SOIC (wide) | 24-lead SOIC (wide) | Package compatibility determines PCB footprint and whether parts can be interchanged on an existing board. |
| Operating temperature range | -40°C to +85°C | -40°C to +85°C | Industrial temperature range suitability is identical, supporting use in similar environments. |
| On-chip calibration | Yes (self and system calibration) | Yes (self and system calibration) | Built-in calibration reduces offset and gain errors, improving accuracy without external circuitry. |
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 | AD7711AR |
|---|---|---|
| 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 AD7711AR?
The AD7710ARZ is a 24-bit sigma-delta ADC with two differential input channels and an on-chip programmable gain amplifier (PGA). The AD7711AR is a 24-bit sigma-delta ADC with two input channels but includes an on-chip RTD excitation current source and a burn-out current source, making it specifically suited for RTD and thermistor temperature measurement applications. Both are manufactured by Analog Devices.
Are the AD7710ARZ and AD7711AR pin-compatible?
No. Although both devices are offered in a 24-lead SOIC package (RW-24), their pin functions differ. The AD7711AR includes dedicated pins for RTD excitation current outputs and burn-out current control that are not present on the AD7710ARZ. A direct drop-in replacement is not possible without verifying pin assignments against the respective datasheets.
Do both devices support the same resolution and output data rate?
Yes. Both the AD7710ARZ and AD7711AR are 24-bit sigma-delta ADCs with a programmable output update rate. Both support output data rates programmable from approximately 9.8 Hz to 1.028 kHz, with corresponding resolution trade-offs as specified in the Analog Devices datasheets.
Which device should be selected for RTD temperature measurement applications?
The AD7711AR is the appropriate choice for RTD applications because it integrates matched excitation current sources and a burn-out current source required for RTD excitation and sensor fault detection. The AD7710ARZ lacks these integrated excitation sources and would require external circuitry for RTD excitation.
Do the AD7710ARZ and AD7711AR share the same digital interface?
Yes. Both devices provide a serial digital interface compatible with SPI and QSPI protocols, supporting bidirectional data transfer for configuration and output data readback. Both also include a bidirectional serial port with separate input and output pins as documented in the Analog Devices datasheets.
What are the supply voltage requirements for these two ADCs?
Both the AD7710ARZ and AD7711AR operate from a single +5 V analog supply (AVDD) and a +5 V digital supply (DVDD), with an additional negative supply option for the analog input range. Both devices also support a standby mode to reduce power consumption. Refer to the respective Analog Devices datasheets for exact supply tolerance and current specifications.
Can the AD7711AR be used as a direct substitute for the AD7710ARZ in an existing design?
Not as a direct substitute. While both are 24-bit sigma-delta ADCs in the same 24-lead SOIC package, the AD7711AR adds RTD excitation and burn-out current functions with different pin assignments. Substitution requires schematic and layout review, verification of pin functions, and validation against the target design requirements using the official Analog Devices datasheets.