Part A
AD7665ASTZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 3003 Stückzahl
- Package
- LQFP-48
- Series
- Datenerfassung mit Analog to Digital Converters (ADC)
Replacement verdict
Compatible functional replacement candidate
The AD7665ASTZ is a viable functional replacement candidate for the AD7663ASTZ, sharing the same 16-bit SAR architecture, LQFP-48 package, and 5 V supply rail, while offering a higher 570 kSPS throughput in place of the 250 kSPS rate. Designers should validate the increased power consumption and confirm timing margins against the faster conversion clock before substituting in existing layouts.
Resolution and Architecture
High match
Package and Pinout
High match
Sampling Rate
Validation required
Power Consumption
Validation required
Parts at a glance
Part B
AD7663ASTZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 5007 Stückzahl
- Package
- LQFP-48
- 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 | AD7663ASTZ | AD7665ASTZ | Why it matters |
|---|---|---|---|
| Resolution | 16 bit | 16 bit | Both are 16-bit SAR ADCs, so nominal resolution is identical and does not differentiate them. |
| Sampling Rate | 250 kSPS | 570 kSPS | The AD7665 offers more than twice the throughput, which matters for higher-bandwidth signal acquisition and faster multiplexed systems. |
| Number of Input Channels | 1 (single-ended) | 1 (single-ended) | Both provide a single analog input channel, so channel count is not a differentiator for substitutability. |
| Input Type | Single-ended | Single-ended | Identical input configuration means the same signal conditioning front-end can be reused. |
| Supply Voltage (Analog) | 5 V | 5 V | Same analog supply simplifies power rail design and allows drop-in replacement in existing boards. |
| Interface | Parallel / Serial (SPI-compatible) | Parallel / Serial (SPI-compatible) | Matching digital interfaces allow the same host controller and firmware to be used with either part. |
| Power Consumption | ~87 mW typical | ~100 mW typical | The AD7665 draws more power at its higher speed; thermal and supply budgeting must account for this difference. |
| Package | 48-lead LQFP | 48-lead LQFP | Identical package and pinout enable direct PCB footprint compatibility between the two devices. |
| INL (Integral Nonlinearity) | ±2.5 LSB max | ±2.5 LSB max | Equivalent linearity performance means both meet the same accuracy class for precision measurement applications. |
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 | AD7665ASTZ | AD7663ASTZ |
|---|---|---|
| Series | PulSAR® | PulSAR® |
| Part Status | Active | Active |
| Number of Bits | 16 | 16 |
| Sampling Rate(Per Second) | 570k | 250k |
| Number of Inputs | 1 | 1 |
| Input Type | Differential | Differential |
| Data Interface | SPI, Parallel, DSP | SPI, Parallel, DSP |
| Configuration | S/H-ADC | S/H-ADC |
| Ratio - S / H: ADC | 1:1 | 1:1 |
| Number of A/D Converters | 1 | 1 |
| Architecture | SAR | SAR |
| Reference Type | External | External |
| Voltage - Supply, Analog | 5V | 5V |
| Voltage - Supply, Digital | 5V | 5V |
| Features | True Bipolar | True Bipolar |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
Frequently asked questions
What are the key differences between the AD7663ASTZ and AD7665ASTZ?
Both are 16-bit, 500 kSPS PulSAR analog-to-digital converters from Analog Devices in a 48-lead LQFP package. The AD7663ASTZ is a bipolar-input ADC supporting ±10 V, ±5 V, and 0 V to 10 V input ranges, while the AD7665ASTZ is a unipolar-input ADC supporting 0 V to 2.5 V, 0 V to 5 V, and 0 V to 10 V ranges. The AD7663ASTZ includes an internal reference buffer configuration suited to bipolar signal chains, whereas the AD7665ASTZ is optimized for unipolar signal chains.
Are the AD7663ASTZ and AD7665ASTZ pin-compatible?
Yes. Both devices are offered in the same 48-lead LQFP (STZ) package and share the same pinout, which allows a common PCB footprint. However, because the analog input ranges and reference configurations differ, the surrounding signal-conditioning circuitry must be validated before substituting one for the other.
Do both ADCs offer the same resolution and throughput?
Yes. Both the AD7663ASTZ and AD7665ASTZ are 16-bit successive-approximation (SAR) ADCs with a maximum throughput of 500 kSPS, making them comparable in resolution and sampling rate for precision data-acquisition applications.
What analog input ranges does each device support?
The AD7663ASTZ supports bipolar input ranges of ±10 V and ±5 V as well as a 0 V to 10 V unipolar range. The AD7665ASTZ supports unipolar ranges of 0 V to 2.5 V, 0 V to 5 V, and 0 V to 10 V. The choice between them depends on whether the sensor or signal chain is bipolar or unipolar.
Do both parts support the same digital interface?
Yes. Both devices provide a parallel digital interface and support serial interface modes, allowing direct connection to DSPs, FPGAs, and microcontrollers. The interface timing and pin functions are consistent across the two parts due to their shared pinout.
Can the AD7663ASTZ and AD7665ASTZ operate from the same supply voltages?
Both devices operate from a 5 V analog supply (AVDD) and a separate digital supply (DVDD) that supports interfacing to 2.7 V to 5 V logic. This common supply architecture simplifies power-rail design when comparing or substituting the two parts.
Which device should be selected for a bipolar sensor front end?
The AD7663ASTZ is the appropriate choice for bipolar sensor front ends because it directly accepts ±10 V and ±5 V inputs without external level shifting. The AD7665ASTZ, being unipolar, would require additional signal conditioning to handle bipolar signals.
Are both devices specified over the same operating temperature range?
Yes. Both the AD7663ASTZ and AD7665ASTZ are specified for operation over the industrial temperature range of −40 °C to +85 °C, making them suitable for the same industrial and instrumentation environments.