Part A
AD7710ANZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 3222 PCS
- Package
- DIP-24
- Series
- Data Acquisition - Analog to Digital Converters (ADC)
Replacement verdict
Not a drop-in replacement
The AD7710ANZ and AD7712AN are both 24-bit sigma-delta ADCs from Analog Devices, but they are not drop-in replacements for one another. The AD7710ANZ provides a single differential input channel with an on-chip programmable gain amplifier and a bidirectional serial interface, while the AD7712AN offers a single channel with a different input configuration and interface arrangement. Designers must verify input signal conditioning, reference requirements, and digital interface timing before considering substitution in an existing socket.
Different input configuration
Different interface arrangement
Different gain architecture
Reference requirements differ
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | AD7710ANZ | AD7712AN | 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 (1 differential, 1 single-ended) | Channel configuration affects how many signals can be measured and whether differential or single-ended inputs are required. |
| PGA gain range | 1 to 128 | 1 to 128 | Programmable gain allows direct interfacing with low-level sensors without external amplification. |
| On-chip current sources | Yes (2) | No | Current sources enable direct excitation of RTDs and resistive sensors; their absence requires external excitation circuitry. |
| Interface type | Serial (SPI-compatible, bidirectional) | Serial (SPI-compatible, bidirectional) | Serial interface compatibility determines ease of connection to microcontrollers and digital systems. |
| Supply voltage (analog) | 5 V (AVDD) with ±5 V capability | 5 V (AVDD) with ±5 V capability | Supply requirements affect power design and signal range compatibility in the target system. |
| Package | 24-lead PDIP (0.3") | 24-lead PDIP (0.3") | Package compatibility determines whether the parts are drop-in replacements on an existing PCB footprint. |
| Operating temperature range | -40°C to +85°C | -40°C to +85°C | Temperature range must match the application environment for reliable operation. |
| Reference input | External differential reference | External differential reference | Reference configuration affects measurement accuracy and the ability to ratio-metric measurements. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD7710ANZ | AD7712AN |
|---|---|---|
| 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 | 1 |
| Input Type | Differential | Differential, Single Ended |
| 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 AD7710ANZ and the AD7712AN?
The AD7710ANZ is a complete analog front end for low-frequency measurement applications, featuring a 24-bit sigma-delta ADC with two differential input channels, an on-chip programmable gain amplifier (PGA), and a bidirectional serial interface. The AD7712AN is a similar 24-bit sigma-delta ADC but includes a single differential input channel plus a high-level analog input channel, and it provides a programmable gain amplifier with gains from 1 to 128 on the low-level input. Both are manufactured by Analog Devices in 24-lead PDIP packages, but the AD7712AN is optimized for applications requiring one low-level and one high-level input, while the AD7710ANZ provides two low-level differential inputs.
Are the AD7710ANZ and AD7712AN pin-compatible?
No. Although both devices are housed in 24-lead PDIP (N) packages, their pin functions differ. The AD7710ANZ provides two differential analog input pairs (AIN1 and AIN2), while the AD7712AN provides one differential low-level input pair and one high-level input. Pin assignments for analog inputs, reference connections, and control signals are not identical, so the two devices are not drop-in replacements and require separate PCB layouts.
Do both devices offer the same resolution and output data rate?
Both the AD7710ANZ and AD7712AN are 24-bit sigma-delta ADCs with programmable output update rates. The AD7710ANZ supports output update rates from approximately 9.8 Hz to 1.028 kHz, while the AD7712AN supports a similar range of output update rates. Both achieve 24-bit no-missing-code resolution at lower update rates. Designers should consult the respective datasheets for exact noise-free resolution versus gain and update rate tables, as performance varies with PGA gain and filter settings.
Can the AD7712AN accept a high-level input that the AD7710ANZ cannot?
Yes. The AD7712AN includes a dedicated high-level analog input channel designed to accept signals up to ±10 V (with appropriate reference and supply conditions), in addition to its low-level differential input. The AD7710ANZ provides two low-level differential input channels intended for direct sensor interfacing with PGA gains up to 128. For applications requiring a high-level voltage input alongside a low-level sensor input, the AD7712AN is the appropriate choice.
Are the AD7710ANZ and AD7712AN interchangeable in existing designs?
No. Because the analog input architecture, pin functions, and channel configuration differ, the AD7710ANZ and AD7712AN are not interchangeable without redesign. A design targeting the AD7710ANZ's dual low-level differential inputs cannot directly accept an AD7712AN, and vice versa. Engineers must verify input configuration, reference requirements, and PCB pin mapping against the respective Analog Devices datasheets before considering any substitution.
What package and operating temperature range do the AD7710ANZ and AD7712AN share?
Both the AD7710ANZ and AD7712AN are offered in a 24-lead plastic dual in-line package (PDIP), designated by the "N" suffix in the part number. Both are specified for the industrial temperature range of −40°C to +85°C. The "Z" suffix on the AD7710ANZ indicates RoHS-compliant lead-free construction per Analog Devices ordering conventions, while the AD7712AN part number reflects the standard PDIP ordering code.
Which device is better suited for dual-sensor ratiometric measurement?
The AD7710ANZ is better suited for dual-sensor ratiometric measurement because it provides two independent differential input channels, each with PGA access, allowing two low-level sensors to be interfaced and converted by a single device. The AD7712AN provides only one low-level differential input, so it cannot directly support two independent low-level sensor channels without external multiplexing. Both devices support ratiometric operation using the reference input, but channel count is the deciding factor.