Part A
AD7677ASTZ
テキサス・インスツルメンツ
- Lifecycle
- Active
- Stock
- 1648 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 AD7677ASTZ and AD7676ASTZRL are both 16-bit successive-approximation ADCs from Analog Devices in the same 48-lead LQFP package, sharing a compatible digital interface and reference architecture. The AD7677ASTZ offers a faster 1 MSPS throughput versus 500 kSPS on the AD7676ASTZRL, so it can serve as a higher-speed functional substitute where timing margin and power budget permit, while the reverse substitution requires validation against the system's sampling-rate requirements.
Resolution
High match
Package Type
High match
Sampling Rate
Validation required
Power Consumption
Validation required
Parts at a glance
Part B
AD7676ASTZRL
テキサス・インスツルメンツ
- Lifecycle
- Active
- Stock
- 5733 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 | AD7677ASTZ | AD7676ASTZRL | Why it matters |
|---|---|---|---|
| Resolution | 16 bits | 16 bits | Both are 16-bit ADCs, so nominal resolution is identical and does not differentiate substitutability. |
| Sampling Rate | 1 MSPS | 500 kSPS | The AD7677 offers twice the throughput, which matters for higher-bandwidth signal acquisition and faster system update rates. |
| Input Type | Differential | Differential | Both accept differential inputs, so the analog front-end topology can remain the same. |
| Number of Input Channels | 1 | 1 | Single-channel architecture in both parts means channel-count requirements are unaffected. |
| Supply Voltage (Analog) | 5 V | 5 V | Identical analog supply simplifies power-rail reuse when swapping parts. |
| Interface Type | SPI / Parallel | SPI / Parallel | Matching digital interfaces allow the same host controller and firmware to be reused. |
| Package / Mounting | 48-LQFP, Surface Mount | 48-LQFP, Surface Mount | Same package and footprint enable drop-in board replacement without layout changes. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Identical temperature ratings mean both suit the same industrial environments. |
| Power Consumption | Higher (approx. 100 mW typical) | Lower (approx. 60 mW typical) | The lower-power AD7676 is preferable in thermally constrained or battery-sensitive designs. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD7677ASTZ | AD7676ASTZRL |
|---|---|---|
| Supplier | - | Analog Devices Inc.,Rochester Electronics, LLC |
| Series | PulSAR® | PulSAR® |
| Part Status | Active | Obsolete |
| Number of Bits | 16 | 16 |
| Sampling Rate(Per Second) | 1M | 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 |
| 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 AD7677ASTZ and the AD7676ASTZRL?
The AD7677ASTZ is a 16-bit, 1 MSPS successive-approximation ADC, while the AD7676ASTZRL is a 16-bit, 500 kSPS successive-approximation ADC. Both are pin-compatible members of the same Analog Devices PulSAR family and share the same 48-lead LQFP package, but the AD7677 offers twice the throughput of the AD7676. The AD7676ASTZRL is supplied in tape-and-reel packaging, whereas the AD7677ASTZ is supplied in tray packaging.
Are the AD7677ASTZ and AD7676ASTZRL pin-compatible?
Yes. Both devices are offered in the same 48-lead LQFP (ST-48) package and are designed as pin-compatible members of the Analog Devices PulSAR ADC family, allowing a common PCB footprint. Designers should still confirm the pinout against the respective datasheets before substituting one for the other.
What is the maximum sampling rate of each device?
The AD7677ASTZ supports a maximum throughput of 1 MSPS. The AD7676ASTZRL supports a maximum throughput of 500 kSPS. Both are 16-bit successive-approximation ADCs, so the AD7677 provides twice the sample rate of the AD7676.
Do both parts use the same analog and digital supply voltages?
Yes. Both the AD7677ASTZ and AD7676ASTZRL operate from a 5 V analog supply (AVDD) and a 5 V digital supply (DVDD), with a separate VIO supply pin for interfacing to logic levels from 2.7 V to 5.5 V. This shared supply architecture supports direct interchangeability in many designs.
What is the difference between the ASTZ and ASTZRL ordering codes?
The "ASTZ" suffix denotes the 48-lead LQFP package in a RoHS-compliant, tray-packaged form. The "ASTZRL" suffix denotes the same 48-lead LQFP package in RoHS-compliant, tape-and-reel packaging intended for automated assembly. The electrical performance of the device is identical; only the packaging and shipping format differ.
Can the AD7676ASTZRL be used as a drop-in replacement for the AD7677ASTZ?
Because both devices share the same 48-lead LQFP package and PulSAR family pinout, the AD7676ASTZRL can physically occupy the same footprint. However, it provides only 500 kSPS versus 1 MSPS for the AD7677ASTZ, so it is only a valid substitute when the system's throughput requirement does not exceed 500 kSPS. The design's timing, firmware, and signal-chain requirements must be revalidated before substitution.
What interface do these ADCs provide for connecting to a host processor?
Both the AD7677ASTZ and AD7676ASTZRL provide a parallel interface with a flexible microprocessor-compatible bus, supporting both 8-bit and 16-bit word widths. The interface includes chip-select, read, and write control signals, and the VIO pin allows direct connection to 2.7 V to 5.5 V logic. This parallel interface is common to both devices in the PulSAR family.
Are both devices RoHS compliant?
Yes. The "Z" in both the AD7677ASTZ and AD7676ASTZRL ordering codes indicates RoHS-compliant packaging, consistent with Analog Devices' lead-free (Pb-free) portfolio. Designers should verify the current compliance status against the latest manufacturer datasheet and product change notices.