Part A
AD7667ASTZ
Công ty Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 6318 PCS
- Package
- LQFP-48
- Series
- Data Acquisition - Analog to Digital Converters (ADC)
Replacement verdict
Compatible functional replacement candidate
The AD7667ASTZ and AD7664ASTZRL are both 16-bit successive-approximation ADCs from Analog Devices in the same LQFP-48 package, sharing a compatible parallel interface and reference architecture. The AD7667ASTZ offers a higher maximum sampling rate (1 MSPS versus 570 kSPS) and a wider analog input span, so it can generally serve as a functional upgrade in existing AD7664ASTZRL sockets, provided the system timing and input range are validated against the faster device.
Resolution and ADC Architecture
High match
Package and Pinout
High match
Maximum Sampling Rate
Validation required
Analog Input Range
Validation required
Parts at a glance
Part B
AD7664ASTZRL
Công ty Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 7597 PCS
- Package
- LQFP-48
- Series
- Data Acquisition - 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 | AD7667ASTZ | 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 | 1 MSPS | 570 kSPS | The AD7667 offers a higher maximum throughput, which matters for applications needing faster conversion rates. |
| Number of Input Channels | 1 | 1 | Both are single-channel devices, so channel count is not a differentiator. |
| Input Type | Differential | Differential | Both accept differential inputs, supporting similar signal-chain topologies. |
| Supply Voltage (Analog) | 5 V | 5 V | Identical analog supply requirements simplify board-level power design when substituting. |
| Interface | Parallel / Serial (SPI, QSPI, MICROWIRE, DSP) | Parallel / Serial (SPI, QSPI, MICROWIRE, DSP) | Matching digital interfaces allow drop-in compatibility with existing host controllers. |
| Package / Case | 48-LQFP | 48-LQFP | Same package footprint enables direct PCB substitution without layout changes. |
| Operating Temperature Range | -40°C to +85°C | -40°C to +85°C | Identical temperature ratings ensure equivalent environmental robustness. |
| Power Consumption | 87 mW typ | 70 mW typ | Lower power in the AD7664 benefits power-sensitive designs, while the AD7667 trades power for speed. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD7667ASTZ | AD7664ASTZRL |
|---|---|---|
| Supplier | - | Analog Devices Inc.,Rochester Electronics, LLC |
| Series | PulSAR® | PulSAR® |
| Part Status | Active | Active |
| Number of Bits | 16 | 16 |
| Sampling Rate(Per Second) | 1M | 570k |
| Number of Inputs | 1 | 1 |
| Input Type | Pseudo-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, Internal | External |
| Voltage - Supply, Analog | 5V | 5V |
| Voltage - Supply, Digital | 5V | 5V |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
Frequently asked questions
What are the key differences between the AD7667ASTZ and AD7664ASTZRL?
The AD7667ASTZ is a 16-bit, 1 MSPS PulSAR analog-to-digital converter, while the AD7664ASTZRL is a 16-bit, 570 kSPS PulSAR ADC. Both are pin-compatible in a 48-lead LQFP package, but the AD7667 offers a higher maximum throughput rate. The AD7664ASTZRL is supplied in tape-and-reel packaging (RL suffix), whereas the AD7667ASTZ is supplied in a tray.
Are the AD7667ASTZ and AD7664ASTZRL pin-compatible?
Yes. Both devices are offered in the same 48-lead LQFP (ST-48) package with identical pin assignments, allowing the AD7667ASTZ to be used as a drop-in replacement for the AD7664ASTZRL in existing layouts, provided the higher 1 MSPS throughput and associated timing requirements are accommodated.
What is the maximum sampling rate of each device?
The AD7667ASTZ supports a maximum throughput of 1 MSPS. The AD7664ASTZRL supports a maximum throughput of 570 kSPS. Both are 16-bit successive-approximation (SAR) PulSAR ADCs.
Do both parts support the same analog input configurations?
Yes. Both the AD7667ASTZ and AD7664ASTZRL feature a flexible analog input that can be configured as a fully differential input, a pseudo-differential input, or a single-ended input, with a selectable input range of 0 V to 2.5 V, 0 V to 5 V, ±2.5 V, or ±5 V depending on configuration.
What digital interfaces do these ADCs provide?
Both devices provide a parallel interface (word or byte mode) and a serial interface (SPI-compatible) for connection to digital hosts. The interface mode is selected via dedicated configuration pins, and both parts support daisy-chaining of multiple converters on the serial bus.
What are the power supply requirements for the AD7667ASTZ and AD7664ASTZRL?
Both devices operate from a 5 V analog supply (AVDD) and a separate digital supply (DVDD) that supports 2.7 V to 5.25 V, allowing direct interfacing to lower-voltage logic. Both parts also include a power-down mode to reduce consumption when not converting.
How do the power dissipation figures compare between the two parts?
The AD7667ASTZ typically dissipates approximately 100 mW at 1 MSPS with a 5 V supply. The AD7664ASTZRL typically dissipates approximately 70 mW at 570 kSPS with a 5 V supply. Actual dissipation scales with throughput, and both parts offer reduced power in power-down mode.
What are the operating temperature ranges and package options?
Both the AD7667ASTZ and AD7664ASTZRL are specified over the industrial temperature range of −40 °C to +85 °C and are offered in the 48-lead LQFP package. The AD7667ASTZ is supplied in trays, while the AD7664ASTZRL is supplied in tape-and-reel for automated assembly.
Can the AD7667ASTZ directly replace the AD7664ASTZRL in an existing design?
Because the two devices are pin-compatible and share the same package, the AD7667ASTZ can generally replace the AD7664ASTZRL. However, the design must be validated for the higher 1 MSPS throughput, including digital host timing, power budget, and PCB signal integrity, against the manufacturer datasheets before substitution.