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 AD7671ASTZ and AD7677ASTZ are both 16-bit successive-approximation ADCs in the same 48-lead LQFP package with a parallel interface, making them strong functional replacement candidates. However, the AD7677ASTZ offers a higher maximum throughput rate and a wider analog input range, so the system timing budget and input signal conditioning must be validated before substituting the AD7671ASTZ with the AD7677ASTZ in an existing design.
Resolution
High match
Package Type
High match
Maximum Throughput Rate
Validation required
Analog Input Range
Validation required
Parts at a glance
Part B
AD7671ASTZ
テキサス・インスツルメンツ
- Lifecycle
- Active
- Stock
- 3582 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 | AD7671ASTZ | AD7677ASTZ | Why it matters |
|---|---|---|---|
| Resolution | 16 bits | 16 bits | Both are 16-bit SAR ADCs, so nominal resolution is identical and not a differentiator for substitutability. |
| Sampling Rate (max) | 1 MSPS | 1 MSPS | Throughput determines the maximum signal bandwidth and system update rate; identical rates ease drop-in replacement. |
| Input Type | Differential (true bipolar) | Differential (true bipolar) | Input configuration must match the signal chain; both accept true differential bipolar inputs, supporting direct substitution. |
| Input Voltage Range | ±2.5 V (with 5 V ref) | ±2.5 V (with 5 V ref) | The full-scale input span must be compatible with the preceding amplifier/driver stage; matching ranges avoid redesign. |
| Supply Voltage | 5 V analog (single) | 5 V analog (single) | Supply requirements affect board power design; identical 5 V analog supply simplifies replacement. |
| Interface | Parallel / Serial (SPI-compatible) | Parallel / Serial (SPI-compatible) | Digital interface compatibility determines whether the host processor connection can remain unchanged. |
| INL (max) | ±2.5 LSB | ±2.5 LSB | Integral nonlinearity defines DC accuracy; matching INL means equivalent static performance. |
| SNR (typ) | 90 dB | 90 dB | Signal-to-noise ratio governs dynamic range; identical SNR indicates comparable AC performance. |
| Package | 48-lead LQFP | 48-lead LQFP | Package and pinout must match for a physical drop-in replacement; both use the same 48-lead LQFP. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Temperature range determines suitability for industrial environments; identical ratings support interchangeability. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD7677ASTZ | AD7671ASTZ |
|---|---|---|
| Series | PulSAR® | PulSAR® |
| Part Status | Active | Active |
| Number of Bits | 16 | 16 |
| Sampling Rate(Per Second) | 1M | 1M |
| 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 |
| Features | - | True Bipolar |
Frequently asked questions
What are the key differences between the AD7671ASTZ and AD7677ASTZ?
The AD7671ASTZ is a 16-bit, 1 MSPS successive-approximation ADC, while the AD7677ASTZ is a 16-bit, 1 MSPS charge-redistribution SAR ADC with a different architecture and feature set. The AD7677ASTZ includes an internal reference buffer and is specified for a different input range configuration, so they are not pin-for-pin or functionally interchangeable without design validation.
Do the AD7671ASTZ and AD7677ASTZ have the same package and pinout?
Both devices are offered in a 48-lead LQFP package, but their pin functions and internal architecture differ. The AD7677ASTZ provides a different analog input configuration and reference interface, so PCB layout and pin assignments must be verified against each respective datasheet before substitution.
What is the maximum sampling rate of each device?
Both the AD7671ASTZ and AD7677ASTZ are specified for a maximum throughput of 1 MSPS (1 million samples per second) at 16-bit resolution.
How do the analog input ranges of the AD7671ASTZ and AD7677ASTZ compare?
The AD7671ASTZ supports software-selectable input ranges including 0 V to 2.5 V, 0 V to 5 V, ±2.5 V, and ±5 V. The AD7677ASTZ is specified with a 0 V to 5 V unipolar input range and a ±5 V bipolar range, with the input span configured via the reference and input configuration pins. Designers should confirm the exact range configuration in each datasheet.
Do both ADCs include an internal voltage reference?
Neither the AD7671ASTZ nor the AD7677ASTZ includes a complete internal voltage reference; both require an external reference for specified operation. The AD7677ASTZ does include an internal reference buffer to simplify external reference interfacing, whereas the AD7671ASTZ requires external reference buffering as described in its datasheet.
What digital interfaces do the AD7671ASTZ and AD7677ASTZ support?
Both devices provide a parallel digital interface for connection to microprocessors and DSPs. The AD7671ASTZ supports a 16-bit parallel interface with additional serial configuration options, while the AD7677ASTZ provides a 16-bit parallel interface. Interface timing and control signals should be verified against the respective datasheets.
Can the AD7677ASTZ be used as a drop-in replacement for the AD7671ASTZ?
No. Although both are 16-bit, 1 MSPS ADCs in 48-lead LQFP packages, differences in analog input configuration, reference buffering, and pin functions mean the AD7677ASTZ is not a drop-in replacement for the AD7671ASTZ. Any substitution requires full schematic, layout, and timing validation against both datasheets.