Part A
AD7738BRUZ
テキサス・インスツルメンツ
- Lifecycle
- Active
- Stock
- 5636 個数
- Package
- TSSOP-28
- Series
- データ取得 - アナログ/デジタルコンバータ (ADC)
Replacement verdict
Compatible functional replacement candidate
The AD7738BRUZ and AD7738BRU are functionally equivalent 8-channel, 24-bit sigma-delta ADCs from Analog Devices, differing only in the RoHS-compliant lead-free package finish of the BRUZ suffix versus the leaded finish of the BRU suffix. Both share identical core specifications, pinout, and package footprint, making the AD7738BRUZ a direct functional replacement for the AD7738BRU in new and existing designs where lead-free assembly is acceptable.
Resolution and Architecture
High match
Channel Count
High match
Package and Pinout
High match
Package Finish and RoHS Compliance
Validation required
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | AD7738BRUZ | AD7738BRU | Why it matters |
|---|---|---|---|
| Number of Channels | 8 | 8 | Determines how many analog input signals the ADC can measure simultaneously; identical channel count means equivalent input capacity. |
| Resolution | 24 bit | 24 bit | Sets the finest measurable signal increment; matching resolution ensures equivalent measurement precision. |
| Sampling Rate | 15.4 kSPS | 15.4 kSPS | Defines the maximum conversion throughput; identical rates mean the same ability to capture fast-changing signals. |
| Interface Type | SPI, DSP | SPI, DSP | Determines compatibility with the host microcontroller or DSP; matching interfaces allow drop-in digital connection. |
| Supply Voltage | 2.7 V to 5.25 V | 2.7 V to 5.25 V | Defines the operating power range; identical ranges ensure the same power supply design can be reused. |
| Package / Case | 24-TSSOP | 24-TSSOP | Determines PCB footprint and assembly compatibility; matching packages allow the same board layout. |
| Mounting Type | Surface Mount | Surface Mount | Confirms the assembly method; identical mounting means the same manufacturing process applies. |
| RoHS Compliance | RoHS Compliant | Non-RoHS (contains lead) | Affects regulatory compliance and solder process; the Z suffix denotes lead-free, which matters for environmental and export requirements. |
| Operating Temperature Range | -40 °C to +105 °C | -40 °C to +105 °C | Defines the environmental limits for reliable operation; identical ranges ensure equivalent thermal robustness. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD7738BRUZ | AD7738BRU |
|---|---|---|
| Supplier | - | Analog Devices Inc.,Rochester Electronics, LLC |
| Part Status | Active | Obsolete |
| Number of Bits | 24 | 24 |
| Sampling Rate(Per Second) | 15.4k | 15.4k |
| Number of Inputs | 4, 8 | 4, 8 |
| Input Type | Differential, Single Ended | Differential, Single Ended |
| Data Interface | SPI, DSP | SPI, DSP |
| Configuration | MUX-ADC | MUX-ADC |
| Number of A/D Converters | 1 | 1 |
| Architecture | Sigma-Delta | Sigma-Delta |
| Reference Type | External | External |
| Voltage - Supply, Analog | 5V | 5V |
| Voltage - Supply, Digital | 2.7V ~ 3.6V, 5V | 2.7V ~ 3.6V, 5V |
| Features | True Bipolar | True Bipolar |
| Operating Temperature | -40°C ~ 105°C | -40°C ~ 105°C |
Frequently asked questions
What is the difference between the AD7738BRUZ and the AD7738BRU?
The AD7738BRUZ and AD7738BRU are functionally identical 8-channel, 24-bit sigma-delta ADCs from Analog Devices. The only difference is the suffix: the "Z" designation indicates RoHS-compliant packaging, while the non-Z version (AD7738BRU) is the older non-RoHS-compliant variant. Both are supplied in a 28-lead TSSOP package.
Are the AD7738BRUZ and AD7738BRU pin-compatible?
Yes. Both devices use the same 28-lead TSSOP package with identical pin assignments, so they are pin-compatible and share the same PCB land pattern.
Can the AD7738BRUZ be used as a drop-in replacement for the AD7738BRU?
Yes, from a functional and package standpoint the AD7738BRUZ is a direct replacement for the AD7738BRU. The primary consideration is RoHS compliance: designs requiring lead-free, RoHS-compliant assemblies should use the AD7738BRUZ.
What are the key specifications shared by both the AD7738BRUZ and AD7738BRU?
Both are 8-channel, 24-bit sigma-delta ADCs with a programmable gain amplifier, operating from a single 5 V analog supply with a 2.7 V to 3.6 V digital supply. They support output data rates up to approximately 15.4 kSPS and communicate over an SPI-compatible serial interface.
Does the "Z" suffix affect the electrical performance of the AD7738?
No. The "Z" suffix denotes RoHS compliance of the package and does not change the electrical specifications. The AD7738BRUZ and AD7738BRU share the same datasheet performance characteristics.
Which variant should be selected for a new RoHS-compliant design?
The AD7738BRUZ should be selected for new designs, as it is the RoHS-compliant version. The AD7738BRU is the non-RoHS legacy variant and is generally not recommended for new lead-free assemblies.
Are both variants available in the same operating temperature range?
Yes. Both the AD7738BRUZ and AD7738BRU are specified over the industrial temperature range of −40 °C to +105 °C, consistent with the Analog Devices datasheet for the AD7738.