Part A
AD7892ARZ-1
Компания Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 6834 ПКС
- Package
- SOIC-24
- Series
- Сбор данных - аналогово-цифровые преобразователи (ADC)
Replacement verdict
Not a drop-in replacement
The AD7892ARZ-1 and AD7890AR-2 are not drop-in replacements for one another. Although both are Analog Devices 12-bit successive-approximation ADCs, they differ in channel architecture, analog input configuration, digital interface, and package footprint, so a direct board-level substitution is not possible without redesign.
Different channel architecture
Different analog input configuration
Different digital interface
Different package footprint
Parts at a glance
Part B
AD7890AR-2
Компания Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 7872 ПКС
- Package
- SOIC-24
- Series
- Сбор данных - ADC-DAC - Специальное назначение
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 | AD7890AR-2 | Why it matters |
|---|---|---|---|
| Resolution (bits) | 12 | 12 | Both are 12-bit ADCs, so nominal resolution is equivalent for substitutability. |
| Number of ADC channels | 1 (single-ended) | 8 (single-ended, multiplexed) | Channel count determines how many analog signals can be digitized; the AD7890 supports 8 inputs while the AD7892 supports only one. |
| Sampling rate (max) | 500 kSPS | 117 kSPS | Maximum throughput affects the ability to capture fast-changing signals; the AD7892 is significantly faster. |
| Input configuration | Single-ended (unipolar/bipolar) | Single-ended, multiplexed | Input topology affects signal conditioning and whether multiple sources can share one converter. |
| Interface type | Parallel | Serial (SPI-compatible) | The digital interface must match the host controller; parallel vs serial changes board routing and pin count. |
| Supply voltage | 5 V | 5 V | Both operate from a single 5 V supply, simplifying power-rail compatibility. |
| Package | 24-lead SOIC | 24-lead SOIC | Package footprint affects PCB layout and whether a drop-in replacement is possible. |
| Internal reference | Yes (2.5 V) | Yes (2.5 V) | An internal reference reduces external component count and simplifies the analog front end. |
| Operating temperature range | -40 °C to +85 °C | -40 °C to +85 °C | Temperature range determines suitability for industrial and extended-environment applications. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD7892ARZ-1 | AD7890AR-2 |
|---|---|---|
| Supplier | - | Analog Devices Inc.,Rochester Electronics, LLC |
| Part Status | Active | Obsolete |
| Type | - | Data Acquisition System (DAS) |
| Number of Channels | - | 8 |
| Resolution(Bits) | - | 12 b |
| Sampling Rate(Per Second) | 500k | 117k |
| Data Interface | SPI, Parallel | SPI |
| Voltage Supply Source | - | Single Supply |
| Voltage - Supply | - | 5V |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
| Mounting Type | - | Surface Mount |
| Number of Bits | 12 | - |
| Number of Inputs | 2 | - |
| Input Type | Single Ended | - |
| Configuration | S/H-ADC | - |
| Ratio - S / H: ADC | 1:1 | - |
| Number of A/D Converters | 1 | - |
| Architecture | SAR | - |
| Reference Type | External, Internal | - |
| Voltage - Supply, Analog | 5V | - |
| Voltage - Supply, Digital | 5V | - |
Frequently asked questions
What are the primary differences between the AD7892ARZ-1 and the AD7890AR-2?
The AD7892ARZ-1 is a 12-bit, 500 kSPS successive-approximation ADC with a single-ended input and an on-chip track-and-hold amplifier, offered in a 24-lead SOIC package. The AD7890AR-2 is a 12-bit, 117 kSPS data acquisition system that integrates an 8-channel multiplexer, track-and-hold, and reference, housed in a 24-lead SOIC. The AD7892ARZ-1 targets high-speed single-channel sampling, while the AD7890AR-2 targets multi-channel multiplexed acquisition at lower throughput.
Are the AD7892ARZ-1 and AD7890AR-2 pin-compatible?
No. Although both devices are packaged in a 24-lead SOIC, their pin functions differ because the AD7892ARZ-1 provides a single analog input with a high-speed parallel interface, whereas the AD7890AR-2 exposes eight multiplexed analog inputs plus digital control and reference pins. The pinouts are not interchangeable, and each device must be laid out according to its own datasheet pin configuration.
What are the maximum sampling rates of the AD7892ARZ-1 and AD7890AR-2?
The AD7892ARZ-1 is specified for a 500 kSPS throughput rate. The AD7890AR-2 is specified for a 117 kSPS throughput rate. The higher conversion rate of the AD7892ARZ-1 suits fast single-channel signal capture, while the AD7890AR-2 is intended for multiplexed multi-channel systems where per-channel rate is lower.
How many analog input channels does each device support?
The AD7892ARZ-1 provides a single analog input channel with an on-chip track-and-hold. The AD7890AR-2 integrates an 8-channel input multiplexer, allowing selection among eight single-ended analog inputs. This makes the AD7890AR-2 suitable for multi-sensor or multi-channel data acquisition, while the AD7892ARZ-1 is optimized for a single high-speed channel.
Do both devices include an on-chip voltage reference?
The AD7890AR-2 includes an on-chip reference, which supports its use as a complete data acquisition system with multiplexer, track-and-hold, and reference in one package. The AD7892ARZ-1 does not include an on-chip reference and requires an external reference voltage for its conversion. Designers must account for this difference in the analog front-end and reference circuitry.
What digital interface do the AD7892ARZ-1 and AD7890AR-2 provide?
Both devices provide a parallel digital output interface for connection to a microprocessor or DSP. The AD7892ARZ-1 offers a high-speed parallel interface consistent with its 500 kSPS throughput. The AD7890AR-2 provides a parallel interface with channel selection and conversion control for its 8-channel multiplexer. The exact timing and control signals differ and must be implemented per each device's datasheet.
Can the AD7892ARZ-1 be used as a drop-in replacement for the AD7890AR-2 in an existing design?
No. The two devices differ in channel count, throughput, reference provision, and pinout, so a direct drop-in replacement is not possible. Replacing one with the other requires redesign of the analog input network, reference circuitry, digital interface timing, and PCB layout to match the target device's specifications.