Part A
AD7890ARZ-10
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 6285 Stückzahl
- Package
- SOIC-24
- Series
- Datenerfassung von ADCs-DACs für besonderen Zweck
Replacement verdict
Compatible functional replacement candidate
The AD7890ARZ-10 and AD7890AR-4 are functionally compatible 12-bit data acquisition systems in the same 24-lead SOIC package, sharing identical architecture, channel count, and interface. The primary distinction is conversion speed, with the AD7890ARZ-10 offering a faster 10 µs conversion time versus the AD7890AR-4. Designers should validate timing margins and throughput requirements before substituting, but the parts are strong functional replacement candidates.
Package Type
High match
Channel Count
High match
Resolution
High match
Conversion Time
Validation required
Parts at a glance
Part B
AD7890AR-4
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 6793 Stückzahl
- Package
- SOIC-24
- Series
- Datenerfassung von ADCs-DACs für besonderen Zweck
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | AD7890ARZ-10 | AD7890AR-4 | Why it matters |
|---|---|---|---|
| Number of ADC Input Channels | 8 | 8 | Both devices provide the same 8-channel multiplexed input architecture, so channel count is not a differentiator for substitutability. |
| Resolution | 12 bit | 12 bit | Identical 12-bit resolution means both parts offer the same nominal measurement precision. |
| Input Voltage Range | ±10 V | ±10 V | The input span determines the analog signal compatibility; both accept the same ±10 V bipolar range. |
| Sampling Rate | 105 kSPS | 105 kSPS | Throughput must meet the system's acquisition timing; both parts share the same maximum sampling rate. |
| Supply Voltage | 5 V | 5 V | Supply compatibility is essential for drop-in replacement; both operate from a single 5 V supply. |
| Interface Type | Serial (SPI-compatible) | Serial (SPI-compatible) | The digital interface must match the host controller; both use a serial interface for data readout. |
| Package / Mounting | 24-Lead SOIC (Surface Mount) | 24-Lead SOIC (Surface Mount) | Package and footprint must be compatible for board-level substitution; both are 24-lead SOIC surface-mount devices. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | The temperature range must cover the application environment; both are specified over the industrial range. |
| RoHS Compliance | RoHS Compliant | Non-RoHS (legacy) | RoHS status affects regulatory compliance and solder process compatibility; the Z suffix indicates a lead-free/RoHS part while the non-Z variant is legacy. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD7890ARZ-10 | AD7890AR-4 |
|---|---|---|
| Supplier | - | Analog Devices Inc.,Rochester Electronics, LLC |
| Part Status | Active | Obsolete |
| Type | Data Acquisition System (DAS) | Data Acquisition System (DAS) |
| Number of Channels | 8 | 8 |
| Resolution(Bits) | 12 b | 12 b |
| Sampling Rate(Per Second) | 117k | 117k |
| Data Interface | SPI | SPI |
| Voltage Supply Source | Single Supply | Single Supply |
| Voltage - Supply | 5V | 5V |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
| Mounting Type | Surface Mount | Surface Mount |
Frequently asked questions
What are the key differences between the AD7890ARZ-10 and AD7890AR-4?
Both are 8-channel, 12-bit successive-approximation ADCs from Analog Devices in a 24-lead SOIC package, but they differ in specified throughput and input range. The AD7890ARZ-10 is specified for a 10 µs conversion time (100 kSPS class) with a ±10 V input range, while the AD7890AR-4 is specified for a 5 µs conversion time (200 kSPS class) with a ±5 V input range. The "Z" suffix on the AD7890ARZ-10 denotes RoHS-compliant lead-free construction, whereas the AD7890AR-4 is the non-RoHS version.
Are the AD7890ARZ-10 and AD7890AR-4 pin-compatible?
Yes. Both devices are offered in the same 24-lead SOIC (R-24) package with an identical pinout, so they are pin-compatible. However, pin compatibility does not guarantee functional interchangeability because the analog input range and conversion timing differ.
Can the AD7890ARZ-10 be used as a drop-in replacement for the AD7890AR-4?
Not unconditionally. Although the pinout and package match, the AD7890ARZ-10 has a ±10 V input range versus ±5 V for the AD7890AR-4, and its conversion time is 10 µs versus 5 µs. The replacement is only valid if the system's analog signal span, reference, and timing budget are revalidated against the AD7890ARZ-10 datasheet.
What is the resolution and architecture of these AD7890 devices?
Both the AD7890ARZ-10 and AD7890AR-4 are 12-bit successive-approximation register (SAR) ADCs with an 8-channel input multiplexer, a track-and-hold amplifier, and an on-chip reference, providing 12-bit resolution over their respective input ranges.
How do the input voltage ranges of the two parts compare?
The AD7890ARZ-10 provides a bipolar ±10 V analog input range, while the AD7890AR-4 provides a bipolar ±5 V analog input range. This difference directly affects the LSB size and the required signal conditioning in the application.
Do the AD7890ARZ-10 and AD7890AR-4 differ in RoHS compliance?
Yes. The AD7890ARZ-10 carries the "Z" suffix indicating RoHS-compliant, lead-free construction, while the AD7890AR-4 is the standard non-RoHS version. This matters for procurement and regulatory compliance in markets requiring lead-free parts.
What interface and supply requirements do these converters share?
Both parts use a serial interface for data output and control, operate from a single +5 V supply with a separate +5 V analog supply, and include an on-chip reference. Designers should confirm exact supply tolerances and interface timing from the respective Analog Devices datasheets before finalizing a design.