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 AD7890BR-2 are not drop-in replacements for one another. Although both are Analog Devices 12-bit successive-approximation ADCs, they differ in channel architecture, package footprint, and interface configuration, so a direct board-level substitution is not possible without redesign.
Different channel count
Different package footprint
Different input configuration
Different interface architecture
Parts at a glance
Part B
AD7890BR-2
テキサス・インスツルメンツ
- Lifecycle
- Active
- Stock
- 167 個数
- Package
- SOIC-24
- Series
- データ取得 - ADC/DAC - 特殊用途向け
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 | AD7890BR-2 | Why it matters |
|---|---|---|---|
| Resolution | 12 bit | 12 bit | Both are 12-bit ADCs, so nominal quantization resolution is equivalent for substitutability. |
| Number of ADC Inputs / Channels | 1 (single channel) | 8 (multiplexed) | The AD7890BR-2 provides an 8-channel multiplexer, while the AD7892ARZ-1 is single-channel; this fundamentally changes system architecture and channel count. |
| Sampling Rate | 500 kSPS | 117 kSPS | Higher sampling rate in the AD7892ARZ-1 supports faster signal acquisition; the AD7890BR-2 is slower, affecting bandwidth and throughput. |
| Input Type | Single-ended | Single-ended (multiplexed) | Input configuration affects signal conditioning and whether multiple sources can be shared on one converter. |
| Interface | Parallel | Serial (SPI/QSPI compatible) | Parallel vs serial interface determines microcontroller pin count, board routing, and firmware compatibility. |
| Supply Voltage | 5 V | 5 V | Both operate from a 5 V supply, simplifying power rail reuse in substitution. |
| Package | 24-lead SOIC | 24-lead SOIC | Matching package footprint allows potential board-level drop-in compatibility. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Identical industrial temperature range supports use in the same environmental conditions. |
| Reference | Internal reference | Internal reference | Both include an on-chip reference, reducing external component count and simplifying design. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD7892ARZ-1 | AD7890BR-2 |
|---|---|---|
| Supplier | - | 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 | Serial |
| Voltage Supply Source | - | Single Supply |
| Voltage - Supply | - | 0V ~ 2.5V |
| 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 key architectural differences between the AD7892ARZ-1 and AD7890BR-2?
The AD7892ARZ-1 is a 12-bit successive-approximation ADC with a single channel and an on-chip track-and-hold amplifier, offering a 1.47 µs conversion time and a 500 kSPS throughput rate. The AD7890BR-2 is an 8-channel, 12-bit data acquisition system that integrates a 12-bit ADC, an 8-channel multiplexer, a track-and-hold amplifier, and a 2.5 V reference, with a 5.9 µs conversion time and a 117 kSPS throughput rate.
Are the AD7892ARZ-1 and AD7890BR-2 pin-compatible or package-compatible?
No. The AD7892ARZ-1 is supplied in a 24-lead SOIC package, while the AD7890BR-2 is supplied in a 24-lead SOIC package as well, but the pin functions differ because the AD7890BR-2 includes an 8-channel multiplexer and additional control pins. The two devices are not direct drop-in replacements and require separate PCB layouts.
How do the input configurations of the AD7892ARZ-1 and AD7890BR-2 differ?
The AD7892ARZ-1 provides a single analog input channel with a track-and-hold amplifier and supports a ±10 V input range (for the -1 grade). The AD7890BR-2 provides eight single-ended analog input channels through an on-chip multiplexer, with a 0 V to 2.5 V input range referenced to its internal 2.5 V reference.
Which device offers higher throughput, and what are the specified rates?
The AD7892ARZ-1 offers a higher throughput rate of 500 kSPS with a 1.47 µs conversion time. The AD7890BR-2 offers a throughput rate of 117 kSPS with a 5.9 µs conversion time. The AD7892ARZ-1 is therefore better suited for higher-speed single-channel acquisition, while the AD7890BR-2 targets multi-channel systems.
Do both devices include an on-chip voltage reference?
No. The AD7892ARZ-1 does not include an on-chip voltage reference and requires an external reference for its conversion. The AD7890BR-2 integrates an on-chip 2.5 V reference, which simplifies system design for multi-channel data acquisition applications.
What are the supply voltage and power consumption specifications for each device?
The AD7892ARZ-1 operates from a single +5 V supply and typically consumes 60 mW. The AD7890BR-2 operates from a single +5 V supply and typically consumes 50 mW. Both devices are specified for operation over the commercial temperature range of 0°C to +70°C.
What digital interface do the AD7892ARZ-1 and AD7890BR-2 provide?
Both devices provide a high-speed serial interface for connection to microprocessors and DSPs. The AD7892ARZ-1 offers a serial interface with a 12-bit word length and supports both read and write operations. The AD7890BR-2 also provides a serial interface and includes additional control lines for channel selection and conversion start, reflecting its multiplexed 8-channel architecture.
In which applications would the AD7892ARZ-1 be preferred over the AD7890BR-2?
The AD7892ARZ-1 is preferred in applications requiring high-speed acquisition of a single analog channel, such as waveform digitization, transient capture, and single-channel control loops, due to its 500 kSPS throughput and 1.47 µs conversion time. The AD7890BR-2 is preferred in multi-channel monitoring and data acquisition systems where eight single-ended inputs and an on-chip reference reduce external component count.