Part A
AD7892ARZ-1
テキサス・インスツルメンツ
- Lifecycle
- Active
- Stock
- 6834 個数
- Package
- SOIC-24
- Series
- データ取得 - アナログ/デジタルコンバータ (ADC)
Replacement verdict
Not a drop-in replacement
The AD7892ARZ-1 and AD7899AR-3 are not drop-in replacements for one another. Although both are Analog Devices 12-bit successive-approximation ADCs in a 24-lead SOIC package, they differ in resolution architecture, input configuration, and interface timing, so a direct board-level substitution is not possible without design changes and validation.
Different input configuration
Different conversion architecture
Different interface timing
Different supply requirements
Parts at a glance
Part B
AD7899AR-3
テキサス・インスツルメンツ
- Lifecycle
- Active
- Stock
- 691 個数
- Package
- SOIC-28
- 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 | AD7892ARZ-1 | AD7899AR-3 | Why it matters |
|---|---|---|---|
| Resolution | 12 bit | 14 bit | Higher resolution provides finer quantization steps, which affects measurement accuracy and dynamic range in the application. |
| Sampling Rate | 500 kSPS | 400 kSPS | Maximum throughput determines the highest signal frequency that can be digitized without aliasing for a given input bandwidth. |
| Number of Input Channels | 1 (single-ended) | 1 (single-ended) | Channel count defines how many analog signals can be measured; both are single-channel devices, so multiplexing is required for multi-signal systems. |
| Input Voltage Range | ±10 V (bipolar) | ±10 V (bipolar) | The full-scale input span must match the sensor or signal amplitude to avoid clipping or loss of resolution. |
| Supply Voltage | 5 V single supply | 5 V single supply | Supply requirements determine power-rail compatibility and whether level shifting or additional regulators are needed. |
| Interface Type | Parallel | Parallel | The digital interface must match the host processor or FPGA bus to allow direct connection without glue logic. |
| Package / Mounting | 20-Lead SOIC (surface mount) | 28-Lead SSOP (surface mount) | Package footprint and pin count affect PCB layout, board space, and whether a drop-in replacement is possible. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | The temperature range must cover the application environment to guarantee specified performance and reliability. |
| Power Consumption | Approx. 60 mW (typical) | Approx. 100 mW (typical) | Power dissipation impacts thermal design and is critical in battery-powered or thermally constrained systems. |
Need help validating a replacement?
Send your BOM and application constraints for technical and sourcing review.
Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD7892ARZ-1 | AD7899AR-3 |
|---|---|---|
| Supplier | - | Analog Devices Inc.,Rochester Electronics, LLC |
| Part Status | Active | Obsolete |
| Number of Bits | 12 | 14 |
| Sampling Rate(Per Second) | 500k | 400k |
| Number of Inputs | 2 | 1 |
| Input Type | Single Ended | Single Ended |
| Data Interface | SPI, Parallel | Parallel |
| 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, Internal |
| 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 primary differences between the AD7892ARZ-1 and the AD7899AR-3?
The AD7892ARZ-1 is a 12-bit successive-approximation ADC with a maximum throughput of 500 kSPS, offering a 0 V to 2.5 V (or ±2.5 V) input range and an on-chip track-and-hold amplifier. The AD7899AR-3 is a 14-bit ADC with a maximum throughput of 400 kSPS and a ±2.5 V input range. The AD7899AR-3 provides higher resolution (14-bit vs. 12-bit) but a lower maximum sampling rate (400 kSPS vs. 500 kSPS) compared to the AD7892ARZ-1.
Are the AD7892ARZ-1 and AD7899AR-3 pin-compatible?
No. The AD7892ARZ-1 is supplied in a 24-lead SOIC package, while the AD7899AR-3 is supplied in a 28-lead SOIC package. The different package sizes and pin counts mean the two devices are not pin-compatible and cannot be interchanged on the same PCB footprint without redesign.
Do both ADCs use the same digital interface?
Both devices provide a parallel digital output interface. The AD7892ARZ-1 offers a 12-bit parallel output, while the AD7899AR-3 provides a 14-bit parallel output. The host processor or FPGA must therefore be configured to read the corresponding data bus width for each device.
How do the analog input ranges of the AD7892ARZ-1 and AD7899AR-3 compare?
The AD7892ARZ-1 supports a 0 V to 2.5 V unipolar input range or a ±2.5 V bipolar input range, depending on the version. The AD7899AR-3 provides a ±2.5 V bipolar input range. Designers should confirm the exact input configuration required by their signal chain before selecting either part.
Which device offers higher resolution and which offers higher throughput?
The AD7899AR-3 offers higher resolution at 14 bits, while the AD7892ARZ-1 offers higher throughput at 500 kSPS versus 400 kSPS for the AD7899AR-3. The choice depends on whether the application prioritizes dynamic range/accuracy or sampling speed.
Can the AD7892ARZ-1 be used as a drop-in replacement for the AD7899AR-3?
No. The devices differ in resolution (12-bit vs. 14-bit), package (24-lead SOIC vs. 28-lead SOIC), and maximum throughput (500 kSPS vs. 400 kSPS). A direct drop-in replacement is not possible; any substitution requires PCB redesign and firmware adjustment, and must be validated against the manufacturer datasheets.
What are the typical applications for each device?
The AD7892ARZ-1 is suited to applications requiring 12-bit accuracy at up to 500 kSPS, such as general-purpose data acquisition and industrial control. The AD7899AR-3, with 14-bit resolution at up to 400 kSPS, is better suited to applications demanding higher precision, such as instrumentation and signal processing where dynamic range is critical. Final selection should be based on the specific system requirements and verified datasheet parameters.