Part A
AD7892ARZ-1
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 6834 Stückzahl
- Package
- SOIC-24
- Series
- Datenerfassung mit Analog to Digital Converters (ADC)
Replacement verdict
Not a drop-in replacement
The AD7892ARZ-1 and AD7899SR-1 are not drop-in replacements for one another. Although both are 12-bit successive-approximation ADCs from Analog Devices, they differ in resolution architecture, input configuration, package footprint, and operating temperature range, so a direct substitution is not possible without circuit and layout redesign.
Different input configuration
Different package footprint
Different temperature grade
Different conversion architecture
Parts at a glance
Part B
AD7899SR-1
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 9543 Stückzahl
- Package
- SOIC-28
- Series
- Datenerfassung mit 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 | AD7892ARZ-1 | AD7899SR-1 | Why it matters |
|---|---|---|---|
| Resolution | 12 bit | 14 bit | Resolution determines the smallest analog change the ADC can distinguish; a 14-bit part offers finer quantization than a 12-bit part, affecting measurement precision and substitutability. |
| Sampling Rate | 500 kSPS | 400 kSPS | Maximum throughput limits the highest signal frequency that can be captured; a faster converter may be required for high-speed acquisition systems. |
| Number of Input Channels | 2 (single-ended) | 1 (single-ended) | Channel count affects how many signals can be multiplexed into one converter; a two-channel device can replace a single-channel one only if the extra channel is unused or external multiplexing is added. |
| Input Voltage Range | ±10 V (bipolar) | 0 V to 2.5 V (unipolar) | The analog input span must match the sensor or signal source; bipolar versus unipolar ranges require different front-end conditioning, so direct substitution is not possible without redesign. |
| Interface Type | Parallel | Parallel | The digital interface must match the host controller's bus; both use a parallel interface, but timing and word width differences still require verification. |
| Supply Voltage | 5 V single supply | 5 V single supply | Supply voltage compatibility ensures the part can operate in the existing power rail; identical 5 V operation simplifies board-level replacement. |
| Package | 20-lead SOIC | 28-lead SSOP | Package footprint and pin count must match the PCB layout; different packages require layout changes and cannot be drop-in substituted. |
| Operating Temperature Range | -40 °C to +85 °C | -55 °C to +125 °C | Temperature range determines suitability for industrial or military environments; the wider range of the AD7899SR-1 supports harsher conditions. |
| Power Consumption | 60 mW typical | 100 mW typical | Power dissipation affects thermal design and supply sizing; a higher-consumption part may exceed the thermal budget of the original design. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD7892ARZ-1 | AD7899SR-1 |
|---|---|---|
| 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 | -55°C ~ 125°C |
Frequently asked questions
What are the key differences between the AD7892ARZ-1 and AD7899SR-1?
The AD7892ARZ-1 is a 12-bit, 500 kSPS successive-approximation ADC with a parallel interface, while the AD7899SR-1 is a 14-bit, 400 kSPS ADC with a parallel interface. The AD7892ARZ-1 offers higher throughput at lower resolution, whereas the AD7899SR-1 provides higher resolution at a slightly lower sampling rate. Both are available in a 28-lead SOIC package, but their resolution, speed, and specified operating temperature ranges differ.
Are the AD7892ARZ-1 and AD7899SR-1 pin-compatible?
No. Although both devices are offered in a 28-lead SOIC package, their pin functions and internal architectures differ. The AD7892ARZ-1 and AD7899SR-1 are not pin-compatible, so a direct drop-in replacement is not possible without PCB redesign and validation against the respective datasheets.
What are the resolution and sampling rate specifications for each device?
The AD7892ARZ-1 provides 12-bit resolution with a maximum throughput of 500 kSPS. The AD7899SR-1 provides 14-bit resolution with a maximum throughput of 400 kSPS. Designers should select based on whether higher resolution (AD7899SR-1) or higher sampling rate (AD7892ARZ-1) is more critical for the application.
What are the operating temperature ranges for the AD7892ARZ-1 and AD7899SR-1?
The AD7892ARZ-1 is specified for the industrial temperature range of −40°C to +85°C. The AD7899SR-1 is specified for the military temperature range of −55°C to +125°C. The wider temperature range of the AD7899SR-1 makes it suitable for harsher environments, while the AD7892ARZ-1 targets standard industrial applications.
Do both ADCs use a parallel digital interface?
Yes. Both the AD7892ARZ-1 and AD7899SR-1 provide a parallel digital output interface for connection to a microprocessor or DSP. The AD7892ARZ-1 offers a 12-bit parallel output, while the AD7899SR-1 offers a 14-bit parallel output. The interface timing and control signals should be reviewed in each datasheet before integration.
Can the AD7892ARZ-1 be used as a replacement for the AD7899SR-1 in an existing design?
No, not as a direct replacement. The two devices differ in resolution (12-bit vs 14-bit), sampling rate (500 kSPS vs 400 kSPS), temperature range, and pin configuration. Substituting one for the other requires revalidation of the digital interface, PCB layout, and system accuracy budget against the target datasheet.
Which device is better suited for high-temperature applications?
The AD7899SR-1 is better suited for high-temperature applications because it is specified over the military temperature range of −55°C to +125°C. The AD7892ARZ-1 is specified over the industrial range of −40°C to +85°C and should not be used outside that range without additional qualification.