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 AD7893AR-3 are both 12-bit successive-approximation ADCs from Analog Devices, but they differ in resolution architecture, input configuration, package footprint, and interface timing, so neither part can be substituted for the other without a board redesign and firmware changes. The AD7892ARZ-1 offers a single 12-bit ADC with a 500 kSPS throughput in a 24-lead SOIC, while the AD7893AR-3 provides a 12-bit ADC with a 117 kSPS throughput in an 8-lead SOIC, making them functionally distinct despite sharing a common converter core family.
Different package footprint
Different throughput rate
Different input configuration
Different interface timing
Parts at a glance
Part B
AD7893AR-3
テキサス・インスツルメンツ
- Lifecycle
- Active
- Stock
- 4826 個数
- Package
- SOIC-8
- 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 | AD7893AR-3 | Why it matters |
|---|---|---|---|
| Resolution | 12 bit | 12 bit | Both are 12-bit ADCs, so resolution is equivalent and does not differentiate substitutability. |
| Number of ADC Inputs / Channels | 2 (single-ended, with 2-channel multiplexer) | 1 (single-ended) | The AD7892 offers two input channels via an internal mux, while the AD7893 has a single channel; this affects system architecture and channel count requirements. |
| Sampling Rate | 500 kSPS | 117 kSPS | The AD7892 samples significantly faster, which matters for higher-bandwidth signal acquisition and throughput requirements. |
| Input Voltage Range | ±10 V (bipolar) | 0 V to +2.5 V (unipolar) | Different input ranges require different signal conditioning; the bipolar ±10 V range of the AD7892 suits industrial signals, while the AD7893's unipolar range suits lower-voltage single-supply systems. |
| Supply Voltage | 5 V (single supply) | 5 V (single supply) | Both operate from a 5 V supply, so power supply design is compatible between the two parts. |
| Interface Type | Parallel (12-bit word) | Serial (SPI/QSPI compatible) | The output interface differs fundamentally (parallel vs serial), which affects microcontroller/FPGA pin count and firmware design, making direct substitution non-trivial. |
| Package / Mounting | 20-lead SOIC (surface mount) | 8-lead SOIC (surface mount) | Different package footprints and pin counts mean the PCB layout must be redesigned; they are not drop-in replacements. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Both cover the industrial temperature range, so environmental compatibility is equivalent. |
| Power Consumption | Approx. 60 mW (typical) | Approx. 25 mW (typical) | The AD7893 consumes less power, which matters for low-power or thermally constrained designs. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD7892ARZ-1 | AD7893AR-3 |
|---|---|---|
| Supplier | - | Rochester Electronics, LLC |
| Part Status | Active | Obsolete |
| Number of Bits | 12 | 12 |
| Sampling Rate(Per Second) | 500k | 117k |
| Number of A/D Converters | 1 | 1 |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
| Number of Inputs | 2 | - |
| Input Type | Single Ended | - |
| Data Interface | SPI, Parallel | - |
| Configuration | S/H-ADC | - |
| Ratio - S / H: ADC | 1:1 | - |
| Architecture | SAR | - |
| Reference Type | External, Internal | - |
| Voltage - Supply, Analog | 5V | - |
| Voltage - Supply, Digital | 5V | - |
Frequently asked questions
What are the key differences between the AD7892ARZ-1 and AD7893AR-3?
The AD7892ARZ-1 is a 12-bit successive-approximation ADC with a 500 kSPS throughput rate, a 0 V to +2.5 V (or ±2.5 V) input range, and an on-chip track-and-hold amplifier, housed in a 24-lead SOIC. The AD7893AR-3 is a 12-bit successive-approximation ADC with a 117 kSPS throughput rate, a 0 V to +2.5 V input range, and an on-chip track-and-hold amplifier, housed in an 8-lead SOIC. The primary differences are speed (500 kSPS vs 117 kSPS), package size (24-lead SOIC vs 8-lead SOIC), and input configuration.
Can the AD7892ARZ-1 and AD7893AR-3 be used interchangeably in an existing design?
No. The two devices differ in package footprint (24-lead SOIC vs 8-lead SOIC), pinout, throughput rate (500 kSPS vs 117 kSPS), and input range options. A direct drop-in replacement is not possible without PCB redesign and validation against the target system requirements.
What are the throughput rates of the AD7892ARZ-1 and AD7893AR-3?
The AD7892ARZ-1 offers a 500 kSPS throughput rate. The AD7893AR-3 offers a 117 kSPS throughput rate. Designs requiring higher sampling speed should select the AD7892ARZ-1, while lower-speed applications may use the AD7893AR-3.
What input voltage ranges do the AD7892ARZ-1 and AD7893AR-3 support?
The AD7892ARZ-1 supports a 0 V to +2.5 V input range (with a ±2.5 V option depending on the grade). The AD7893AR-3 supports a 0 V to +2.5 V input range. Both are 12-bit ADCs with on-chip track-and-hold amplifiers.
How do the package and pin count differ between the AD7892ARZ-1 and AD7893AR-3?
The AD7892ARZ-1 is supplied in a 24-lead SOIC package, while the AD7893AR-3 is supplied in an 8-lead SOIC package. The difference in pin count and footprint means the two devices are not mechanically or electrically interchangeable on the same PCB land pattern.
Do both the AD7892ARZ-1 and AD7893AR-3 include an on-chip track-and-hold amplifier?
Yes. Both the AD7892ARZ-1 and AD7893AR-3 are 12-bit successive-approximation ADCs that integrate an on-chip track-and-hold amplifier, allowing them to digitize time-varying analog signals without an external sample-and-hold stage.
Which device is better suited for higher-speed data acquisition systems?
The AD7892ARZ-1 is better suited for higher-speed data acquisition because it provides a 500 kSPS throughput rate, compared with 117 kSPS for the AD7893AR-3. The higher sampling rate supports wider signal bandwidth and faster multiplexed channel scanning.
Are the AD7892ARZ-1 and AD7893AR-3 both 12-bit ADCs?
Yes. Both devices are 12-bit successive-approximation analog-to-digital converters. The resolution is identical; the differences lie in throughput rate, package, pinout, and input range configuration.