Part A
AD7663ASTZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 5007 Stückzahl
- Package
- LQFP-48
- Series
- Datenerfassung mit Analog to Digital Converters (ADC)
Replacement verdict
Compatible functional replacement candidate
The AD7666ASTZRL is a strong functional replacement candidate for the AD7663ASTZ, sharing the same 16-bit SAR architecture, 48-lead LQFP package, and 5 V supply rail. Designers should validate the higher throughput requirement and confirm the internal reference configuration meets the target application before substituting in production.
Resolution and Architecture
High match
Package Type
High match
Sampling Rate
Validation required
Reference Configuration
Validation required
Parts at a glance
Part B
AD7666ASTZRL
Hethit
- Lifecycle
- Active
- Stock
- 3652 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 | AD7666ASTZRL | Why it matters |
|---|---|---|---|
| Resolution | 16 bit | 16 bit | Bit depth determines the quantization granularity; both are 16-bit, so nominal dynamic range is comparable. |
| Sampling Rate | 250 kSPS | 500 kSPS | Maximum throughput affects how fast the system can acquire signals; the AD7666 supports twice the sample rate. |
| Number of Input Channels | 2 (differential) | 1 (differential) | Channel count determines how many signal sources can be multiplexed without external switching. |
| Input Type | Differential | Differential | Differential inputs improve common-mode rejection and noise immunity; both share this architecture. |
| Interface | Parallel / Serial (SPI) | Parallel / Serial (SPI) | Digital interface compatibility determines whether the part can drop into an existing host processor bus. |
| Supply Voltage (Analog) | 5 V | 5 V | Analog supply defines input range headroom and must match the surrounding signal chain. |
| Package | 48-LQFP | 48-LQFP | Footprint and pinout compatibility are essential for physical substitutability on an existing PCB. |
| Power Consumption | ~85 mW | ~120 mW | Power budget and thermal design depend on the converter's dissipation, which differs between the two parts. |
| INL (Integral Nonlinearity) | ±2.5 LSB max | ±2.5 LSB max | INL specifies DC accuracy; matching values indicate comparable linearity performance. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Industrial temperature range confirms suitability for harsh environments; both parts share the same rating. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD7663ASTZ | AD7666ASTZRL |
|---|---|---|
| Supplier | - | Rochester Electronics, LLC |
| Series | PulSAR® | PulSAR® |
| Part Status | Active | Active |
| Number of Bits | 16 | 16 |
| Sampling Rate(Per Second) | 250k | 500k |
| 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, Internal |
| Voltage - Supply, Analog | 5V | 5V |
| Voltage - Supply, Digital | 5V | 5V |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
| Features | True Bipolar | - |
Frequently asked questions
What are the key differences between the AD7663ASTZ and AD7666ASTZRL?
The AD7663ASTZ is a 16-bit, 250 kSPS PulSAR analog-to-digital converter, while the AD7666ASTZRL is a 16-bit, 500 kSPS PulSAR ADC. The AD7666ASTZRL offers twice the maximum throughput rate of the AD7663ASTZ. Both are pin-compatible in the 48-lead LQFP package and share the same PulSAR architecture, but differ in specified sampling rate and associated timing parameters.
Are the AD7663ASTZ and AD7666ASTZRL pin-compatible?
Yes. Both devices are offered in the same 48-lead LQFP (ST-48) package and are pin-compatible, which allows the AD7666ASTZRL to be used as a higher-throughput drop-in option in designs originally laid out for the AD7663ASTZ, provided the system timing and power budget are revalidated.
What is the maximum sampling rate of each device?
The AD7663ASTZ is specified for a maximum throughput of 250 kSPS. The AD7666ASTZRL is specified for a maximum throughput of 500 kSPS. The higher rate of the AD7666ASTZRL requires correspondingly faster digital timing and, in some configurations, higher power consumption.
Do both parts offer the same resolution and interface?
Yes. Both are 16-bit successive-approximation (SAR) ADCs with a parallel interface and support for both serial and parallel readback modes. Both feature a pseudo-differential analog input structure and operate from a 5 V analog supply with a separate digital supply, making them functionally similar apart from throughput and associated timing specifications.
Can the AD7666ASTZRL directly replace the AD7663ASTZ in an existing design?
Because the two devices are pin-compatible and share the same package and interface, the AD7666ASTZRL can generally serve as a replacement for the AD7663ASTZ. However, the designer must verify that the host interface can accommodate the higher 500 kSPS throughput, that the digital timing (conversion and acquisition times) is compatible, and that the power dissipation remains within the system budget.
How do the power consumption figures compare?
Both devices are specified with typical power dissipation in the range of approximately 100 mW to 120 mW at their respective maximum throughput rates, with the AD7666ASTZRL drawing somewhat more power at 500 kSPS than the AD7663ASTZ at 250 kSPS. Exact values should be confirmed against the respective manufacturer datasheets for the specific operating conditions.
What is the significance of the "RL" suffix on the AD7666ASTZRL?
The "RL" suffix denotes tape-and-reel packaging for the AD7666ASTZRL, indicating the device is supplied in reels for automated assembly. The AD7663ASTZ, by contrast, is typically supplied in tray or tube packaging. The electrical performance of the device is unaffected by the packaging suffix.