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 AD7898AR-3 are not drop-in replacements for one another. Although both are Analog Devices 12-bit successive-approximation ADCs, they differ in resolution architecture, input configuration, package footprint, and interface timing, so substituting one for the other requires board-level redesign and firmware validation rather than direct replacement.
Different input configuration
Different package footprint
Different interface timing
Different reference architecture
Parts at a glance
Part B
AD7898AR-3
テキサス・インスツルメンツ
- Lifecycle
- Active
- Stock
- 7616 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 | AD7898AR-3 | Why it matters |
|---|---|---|---|
| Resolution | 12 bit | 12 bit | Both are 12-bit ADCs, so nominal quantization resolution is equivalent for substitutability. |
| Number of Input Channels | 2 (single-ended) | 1 (single-ended) | Channel count determines how many signals can be digitized; the AD7892 offers two channels while the AD7898 offers one. |
| Sampling Rate | 500 kSPS | 200 kSPS | Maximum throughput affects the bandwidth of signals that can be captured; the AD7892 samples faster. |
| Input Voltage Range | ±10 V (bipolar) | 0 V to 2.5 V (unipolar) | Input range must match the sensor or signal amplitude; bipolar vs unipolar ranges are not directly interchangeable. |
| Supply Voltage | 5 V | 5 V | Both operate from a single 5 V supply, simplifying power-rail compatibility. |
| Interface Type | Parallel | Serial (SPI/QSPI/MICROWIRE) | The digital interface must match the host controller; parallel vs serial interfaces require different board routing and firmware. |
| Package | 24-lead SOIC | 8-lead SOIC | Package footprint and pin count affect PCB layout; these parts are not drop-in footprint compatible. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Both cover the industrial temperature range, so environmental compatibility is equivalent. |
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 | AD7898AR-3 |
|---|---|---|
| Supplier | - | Analog Devices Inc.,Rochester Electronics, LLC |
| Part Status | Active | Obsolete |
| Number of Bits | 12 | 12 |
| Sampling Rate(Per Second) | 500k | 220k |
| Number of Inputs | 2 | 1 |
| Input Type | Single Ended | Single Ended |
| Data Interface | SPI, Parallel | SPI |
| 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 |
| 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 key differences between the AD7892ARZ-1 and AD7898AR-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 input range and an internal 2.5 V reference. The AD7898AR-3 is a 12-bit SAR ADC with a maximum throughput of 200 kSPS, featuring a pseudo-differential input and a 0 V to 2.5 V unipolar input range. The AD7892ARZ-1 provides higher sampling speed, while the AD7898AR-3 is optimized for lower power consumption in portable applications.
Are the AD7892ARZ-1 and AD7898AR-3 pin-compatible?
No. The AD7892ARZ-1 is supplied in a 24-lead SOIC package, while the AD7898AR-3 is supplied in an 8-lead SOIC package. The pin counts and pin functions differ, so they are not drop-in replacements for each other.
What are the power supply requirements for each device?
The AD7892ARZ-1 operates from a single +5 V supply. The AD7898AR-3 operates from a single +5 V supply as well. Both devices are specified for operation over the industrial temperature range of −40 °C to +85 °C.
How do the input configurations of the two ADCs differ?
The AD7892ARZ-1 provides a single-ended input with a 0 V to 2.5 V range and an internal 2.5 V reference. The AD7898AR-3 offers a pseudo-differential input with a 0 V to 2.5 V unipolar range. The pseudo-differential input of the AD7898AR-3 can help reject common-mode noise in the signal path.
Which device is better suited for high-speed data acquisition?
The AD7892ARZ-1 is better suited for high-speed data acquisition because it supports a maximum throughput of 500 kSPS, compared with 200 kSPS for the AD7898AR-3. The higher sampling rate of the AD7892ARZ-1 allows it to capture faster-changing signals.
Can the AD7898AR-3 replace the AD7892ARZ-1 in an existing design?
Not directly. The two devices differ in package (8-lead SOIC vs 24-lead SOIC), maximum throughput (200 kSPS vs 500 kSPS), and input configuration (pseudo-differential vs single-ended). A replacement requires PCB redesign and validation against the system's timing, accuracy, and interface requirements.
What digital interface do these ADCs provide?
Both the AD7892ARZ-1 and AD7898AR-3 provide a high-speed serial interface for connection to microcontrollers, DSPs, and FPGAs. The AD7892ARZ-1 also offers a parallel interface option, while the AD7898AR-3 is serial-only. Designers should confirm the specific interface mode against the respective manufacturer datasheet.