Part A
AD7609BSTZ
Công ty Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 7244 PCS
- Package
- LQFP-64
- Series
- Data Acquisition - ADCs-DACs - Special Purpose
Replacement verdict
Compatible functional replacement candidate
The AD7608BSTZ and AD7609BSTZ share the same 64-lead LQFP package, 8-channel simultaneous-sampling architecture, and pin-compatible footprint, making them strong functional replacement candidates. The primary distinction is the input configuration: the AD7608 provides eight single-ended inputs, while the AD7609 provides eight true differential inputs. Designers must confirm that the input topology, interface timing, and reference configuration of the target design align with the selected variant before substitution.
Package Type
High match
Channel Count
High match
Input Configuration
Validation required
Resolution
High match
Parts at a glance
Part B
AD7608BSTZ
Công ty Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 2139 PCS
- Package
- LQFP-64
- Series
- Data Acquisition - ADCs-DACs - Special Purpose
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 | 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 resolution means both offer the same nominal dynamic range and quantization step for precision measurement applications. |
| 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 choice depends on the sensor/signal topology. |
| Throughput Rate (max) | 200 kSPS | 200 kSPS | Equal maximum sampling rate means both can handle the same signal bandwidth and update-rate requirements. |
| Analog Input Range | ±10 V, ±5 V | ±10 V, ±5 V | Matching selectable input ranges allow both parts to interface with the same industrial signal levels without additional front-end scaling. |
| Supply Voltage | 5 V (single supply) | 5 V (single supply) | Same single 5 V supply simplifies power design and allows drop-in power compatibility between the two parts. |
| Integrated Input Clamp / Overvoltage Protection | Yes (±16.5 V clamp) | Yes (±16.5 V clamp) | Both include analog input clamp protection, so robustness against overvoltage faults is equivalent. |
| Package | 64-lead LQFP | 64-lead LQFP | Identical package and pinout support direct PCB footprint compatibility, easing substitution in existing designs. |
| Interface | Parallel / Serial (SPI) | Parallel / Serial (SPI) | Same digital interface options allow either part to connect to the same host processor without interface redesign. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD7609BSTZ | 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 primary differences between the AD7608BSTZ and AD7609BSTZ?
The AD7608BSTZ is an 8-channel, 18-bit bipolar input simultaneous sampling ADC, while the AD7609BSTZ is an 8-channel, 18-bit true differential input simultaneous sampling ADC. Both share the same 64-lead LQFP package and pinout, but the AD7609 provides differential analog inputs whereas the AD7608 provides single-ended bipolar inputs.
Are the AD7608BSTZ and AD7609BSTZ pin-compatible?
Yes. Both devices are offered in the same 64-lead LQFP (STZ) package with an identical pinout, allowing a common PCB footprint. However, pin-compatibility does not guarantee functional equivalence because the analog input configuration differs between the two devices.
What is the analog input configuration of each device?
The AD7608BSTZ provides eight single-ended bipolar analog input channels, each accepting a ±10 V or ±5 V range. The AD7609BSTZ provides eight true differential analog input channels, each accepting a ±10 V or ±5 V differential range, which improves common-mode noise rejection.
Do both devices offer the same resolution and throughput?
Yes. Both the AD7608BSTZ and AD7609BSTZ are 18-bit simultaneous sampling ADCs with eight channels and a maximum throughput of 200 kSPS per channel, using an on-chip oscillator and digital filter.
What is the analog input voltage range for each part?
Both devices support selectable input ranges of ±10 V and ±5 V. On the AD7608BSTZ these ranges apply to each single-ended bipolar input; on the AD7609BSTZ they apply to each differential input pair.
Can the AD7609BSTZ be used as a drop-in replacement for the AD7608BSTZ?
Not directly. Although the package and pinout are identical, the AD7609BSTZ requires differential input signals while the AD7608BSTZ expects single-ended bipolar inputs. A design change to the analog front-end and signal routing is required before substitution.
Do both devices share the same digital interface and supply requirements?
Yes. Both devices provide a parallel and serial digital interface, operate from a 5 V analog supply with a flexible 2.3 V to 5.25 V VDRIVE logic supply, and include an on-chip reference and reference buffer.
Which device is better suited for noisy industrial environments?
The AD7609BSTZ is generally preferred where common-mode noise and ground offsets are present, because its true differential inputs reject common-mode signals. The AD7608BSTZ is appropriate for single-ended bipolar signal sources in applications where differential input conditioning is not required.