Part A
AD7609BSTZ-RL
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 5621 PCS
- Package
- LQFP-64
- Series
- Acquisição de dados - ADCs-DACs - Objetivo Especial
Replacement verdict
Compatible functional replacement candidate
The AD7609BSTZ-RL is a viable functional replacement candidate for the AD7608BSTZ in most designs, as both share the same 8-channel simultaneous-sampling architecture, 18-bit resolution, and 64-lead LQFP footprint. The primary distinction is the input configuration: the AD7608 provides single-ended inputs, while the AD7609 offers true differential inputs, so the replacement is only appropriate where the system can accommodate differential signal routing and the associated interface and timing considerations have been validated.
Resolution and Channel Count
High match
Package and Pinout
High match
Input Configuration
Validation required
Digital Interface Timing
Validation required
Parts at a glance
Part B
AD7608BSTZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 2139 PCS
- Package
- LQFP-64
- Series
- Acquisição de dados - ADCs-DACs - Objetivo Especial
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | AD7608BSTZ | AD7609BSTZ-RL | Why it matters |
|---|---|---|---|
| Number of ADC Channels | 8 | 8 | Both devices provide 8 simultaneous-sampling channels, so channel count is not a differentiator for substitutability. |
| Resolution | 18 bits | 18 bits | Identical 18-bit resolution means both offer the same nominal precision for high-accuracy measurement systems. |
| Input Type | Single-ended | True differential | This is the key functional difference: single-ended inputs suit ground-referenced signals, while true differential inputs improve common-mode rejection and noise immunity, so the two are not drop-in substitutes. |
| Input Voltage Range | ±10 V, ±5 V | ±10 V, ±5 V | Matching bipolar ranges allow both to interface with the same industrial signal levels without additional conditioning. |
| Throughput Rate | 200 kSPS | 200 kSPS | Equal maximum sampling rate means timing and throughput budgets remain unchanged when swapping parts. |
| Supply Voltage | 5 V single supply | 5 V single supply | A common 5 V single-supply requirement simplifies power-rail compatibility between the two devices. |
| Interface | SPI / Parallel | SPI / Parallel | Identical digital interfaces allow either part to connect to the same host controller without firmware or layout changes. |
| Package | 64-lead LQFP | 64-lead LQFP | Same package and pinout support a common PCB footprint, easing board-level substitution. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Identical industrial temperature ratings ensure both meet the same environmental requirements. |
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 | AD7609BSTZ-RL | AD7608BSTZ |
|---|---|---|
| Part Status | Active | Active |
| Type | Data Acquisition System (DAS), ADC | Data Acquisition System (DAS), ADC |
| Number of Channels | 8 | 8 |
| Resolution(Bits) | 18 b | 18 b |
| Sampling Rate(Per Second) | 200k | 200k |
| Data Interface | SPI, DSP | SPI, DSP |
| Voltage Supply Source | Analog and Digital | Analog and Digital |
| Voltage - Supply | 2.3V ~ 5V, 4.75V ~ 5.25V | 2.3V ~ 5.25V, 4.75V ~ 5.25V |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
| Mounting Type | Surface Mount | Surface Mount |
Frequently asked questions
What are the key differences between the AD7608BSTZ and AD7609BSTZ-RL?
The AD7608BSTZ is an 8-channel, 18-bit bipolar input simultaneous sampling ADC, while the AD7609BSTZ-RL is an 8-channel, 18-bit true differential input simultaneous sampling ADC. Both are pin-compatible in a 64-lead LQFP package, but the AD7609 provides differential inputs with a ±10 V or ±5 V range, whereas the AD7608 offers single-ended bipolar inputs with a ±10 V or ±5 V range.
Are the AD7608BSTZ and AD7609BSTZ-RL pin-compatible?
Yes. Both devices are offered in the same 64-lead LQFP package with identical pinout assignments, allowing a common PCB footprint. However, input configuration differs (single-ended vs. true differential), so the analog front-end circuitry must be designed accordingly.
What is the maximum throughput rate of these ADCs?
Both the AD7608BSTZ and AD7609BSTZ-RL support a maximum throughput of 200 kSPS per channel, with all eight channels sampled simultaneously. The conversion time and data read timing are specified in the respective datasheets.
What analog input ranges do the AD7608BSTZ and AD7609BSTZ-RL support?
The AD7608BSTZ supports single-ended bipolar input ranges of ±10 V and ±5 V. The AD7609BSTZ-RL supports true differential bipolar input ranges of ±10 V and ±5 V. Both devices include on-chip input clamping and overvoltage protection.
Do both devices include an on-chip reference and reference buffer?
Yes. Both the AD7608BSTZ and AD7609BSTZ-RL integrate a 2.5 V internal reference with a reference buffer, and both allow the use of an external reference if required by the application.
What digital interface do the AD7608BSTZ and AD7609BSTZ-RL provide?
Both devices provide a parallel interface (byte or word mode) and a serial interface (SPI/QSPI/MICROWIRE/DSP-compatible) for reading conversion results. The interface mode is selected via dedicated configuration pins.
What are the operating temperature ranges for these devices?
Both the AD7608BSTZ and AD7609BSTZ-RL are specified for operation over the industrial temperature range of −40°C to +85°C, as stated in the Analog Devices datasheets.
Can the AD7608BSTZ be replaced by the AD7609BSTZ-RL without design changes?
Not without design changes. Although the package and pinout are compatible, the AD7609BSTZ-RL uses true differential inputs while the AD7608BSTZ uses single-ended inputs. The analog front-end, input filtering, and signal conditioning must be redesigned to match the differential input configuration of the AD7609.