Part A
AD7665ASTZ
テキサス・インスツルメンツ
- Lifecycle
- Active
- Stock
- 3003 個数
- Package
- LQFP-48
- Series
- データ取得 - アナログ/デジタルコンバータ (ADC)
Replacement verdict
Compatible functional replacement candidate
The AD7665ASTZ and AD7664ASTZRL are both 16-bit successive-approximation ADCs from Analog Devices in the same LQFP-48 package, sharing a compatible digital interface and reference architecture. The AD7665ASTZ offers a higher maximum throughput of 570 kSPS versus 500 kSPS for the AD7664ASTZRL, so the AD7665ASTZ can serve as a functional replacement in most designs provided timing margins and power budgets are validated. The AD7664ASTZRL remains suitable where its 500 kSPS rate is sufficient, but designers should confirm supply current, acquisition timing, and configuration pin strapping before substituting either device.
Resolution and Architecture
High match
Package and Pinout
High match
Sampling Rate
Validation required
Power Consumption
Validation required
Parts at a glance
Part B
AD7664ASTZRL
テキサス・インスツルメンツ
- Lifecycle
- Active
- Stock
- 7597 個数
- Package
- LQFP-48
- Series
- データ取得 - アナログ/デジタルコンバータ (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 | AD7665ASTZ | AD7664ASTZRL | Why it matters |
|---|---|---|---|
| Resolution | 16 bit | 16 bit | Both are 16-bit SAR ADCs, so resolution is identical and not a differentiator for substitutability. |
| Sampling Rate | 570 kSPS | 570 kSPS | Throughput determines maximum signal bandwidth; identical rates mean equivalent timing performance. |
| Number of Input Channels | 4 (single-ended) / 2 (differential) | 1 (single-ended) / 1 (differential) | Channel count affects system architecture; the AD7665 supports multiplexed multi-channel acquisition while the AD7664 is single-channel. |
| Input Type | Single-ended or differential | Single-ended or differential | Both support flexible input configurations, so signal conditioning requirements are similar. |
| Supply Voltage (Analog) | 5 V | 5 V | Analog supply compatibility ensures the parts can drop into the same power rail design. |
| Interface | Parallel / Serial (SPI-compatible) | Parallel / Serial (SPI-compatible) | Matching digital interfaces allow reuse of the same host controller and firmware. |
| Package | 48-Lead LQFP | 48-Lead LQFP | Identical package and pinout simplify PCB layout and physical replacement. |
| INL (Integral Nonlinearity) | ±2.5 LSB max | ±2.5 LSB max | INL defines DC accuracy; equal specifications mean comparable measurement precision. |
| Power Consumption | 87 mW typ | 87 mW typ | Similar power draw means thermal and supply budgeting remain unchanged when substituting. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD7665ASTZ | AD7664ASTZRL |
|---|---|---|
| Supplier | - | Analog Devices Inc.,Rochester Electronics, LLC |
| Series | PulSAR® | PulSAR® |
| Part Status | Active | Active |
| Number of Bits | 16 | 16 |
| Sampling Rate(Per Second) | 570k | 570k |
| Number of Inputs | 1 | 1 |
| Input Type | Differential | Pseudo-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 |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
| Features | True Bipolar | - |
Frequently asked questions
What are the key differences between the AD7665ASTZ and AD7664ASTZRL?
The AD7665ASTZ is a 16-bit, 570 kSPS PulSAR analog-to-digital converter, while the AD7664ASTZRL is a 16-bit, 570 kSPS PulSAR ADC as well. Both are pin-compatible members of the AD766x family in a 48-lead LQFP package. The primary differences are in specified performance grades and packaging format: the AD7665ASTZ is supplied in a tray, whereas the AD7664ASTZRL is supplied in tape-and-reel for automated assembly. Designers should confirm the exact dynamic performance, INL, and power specifications from each respective datasheet before substitution.
Are the AD7665ASTZ and AD7664ASTZRL pin-compatible?
Yes. Both devices are offered in the same 48-lead LQFP (ST-48) package with the same pinout, which allows them to share a common PCB footprint. However, pin compatibility does not guarantee identical electrical performance, so the system timing, reference, and interface requirements should be verified against each datasheet.
What is the resolution and throughput of these ADCs?
Both the AD7665ASTZ and AD7664ASTZRL are 16-bit successive-approximation (SAR) ADCs with a maximum throughput of 570 kSPS. They use an internal or external reference and provide a parallel interface for output data.
What package and mounting type do these components use?
Both parts are housed in a 48-lead LQFP (Low-profile Quad Flat Package) and are surface-mount devices. The AD7665ASTZ is typically shipped in trays, while the AD7664ASTZRL suffix indicates tape-and-reel packaging for high-volume pick-and-place assembly.
Can the AD7664ASTZRL be used as a drop-in replacement for the AD7665ASTZ?
Because they share the same package and pinout, a drop-in replacement is physically possible. However, a drop-in replacement should only be performed after comparing the AC and DC specifications, reference requirements, and power consumption from both datasheets to ensure the replacement meets the target design's performance margins.
What are the typical applications for these 16-bit SAR ADCs?
These 570 kSPS, 16-bit PulSAR ADCs are suited for applications requiring high accuracy and moderate speed, such as medical instrumentation, data acquisition systems, industrial process control, and spectrum analyzers. The tape-and-reel version (AD7664ASTZRL) is preferred for automated production lines.
Do these ADCs require an external reference voltage?
Both devices can operate with either an internal reference or an external reference, depending on the configuration. The datasheet specifies the reference input range and the corresponding performance; designers should consult the official datasheet to select the appropriate reference source for their accuracy requirements.