Part A
AD7738BRUZ
Analog Equipment GmbH.
- Lifecycle
- Active
- Stock
- 5636 PCS
- Package
- TSSOP-28
- Series
- Acquisition de données - Convertisseur analogique - numérique (ADC)
Replacement verdict
Compatible functional replacement candidate
The AD7738BRUZ and AD7734BRU are both multichannel sigma-delta ADCs from the same family and share a common TSSOP-28 footprint and serial interface, but they differ in channel count, resolution, and data rate. The AD7738BRUZ offers eight single-ended or four differential channels at 24-bit resolution, while the AD7734BRU provides four single-ended or two differential channels at 24-bit resolution with a higher maximum output data rate. The AD7738BRUZ is a viable functional substitute for the AD7734BRU only when the reduced channel count and lower throughput of the AD7734BRU are acceptable; otherwise, validation of channel requirements and timing is required before substitution.
Channel Count
High match
Resolution
High match
Maximum Data Rate
Validation required
Package Type
High match
Parts at a glance
Part B
AD7734BRU
Analog Equipment GmbH.
- Lifecycle
- Active
- Stock
- 9466 PCS
- Package
- TSSOP-28
- Series
- Acquisition de données - Convertisseur analogique - numérique (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 | AD7738BRUZ | AD7734BRU | Why it matters |
|---|---|---|---|
| Number of ADC Channels | 8 (single-ended) / 4 (differential) | 4 (single-ended) / 4 (differential) | Channel count determines how many sensor inputs can be measured; the AD7738 offers twice the single-ended channel capacity. |
| Resolution | 24-bit | 24-bit | Both provide 24-bit sigma-delta resolution, so precision is equivalent for high-accuracy measurement applications. |
| Maximum Throughput Rate | 15.4 kSPS | 15.4 kSPS | Identical maximum output data rate means both can handle the same sampling bandwidth requirements. |
| Interface Type | SPI / Serial (3-wire) | SPI / Serial (3-wire) | Matching serial interfaces allow either part to connect to the same microcontroller without protocol changes. |
| Supply Voltage (Analog) | 5 V | 5 V | Same analog supply simplifies power rail design and ensures comparable input range behavior. |
| Package / Mounting | 28-TSSOP (RU-28) | 28-TSSOP (RU-28) | Identical package and footprint enable drop-in PCB compatibility between the two devices. |
| Operating Temperature Range | -40 °C to +105 °C | -40 °C to +105 °C | Equivalent temperature ratings ensure both parts suit the same industrial environments. |
| RoHS Compliance | RoHS compliant (Z suffix) | Non-RoHS (standard RU grade) | The Z suffix on AD7738BRUZ denotes lead-free/RoHS compliance, while AD7734BRU is the non-RoHS version, affecting regulatory and assembly requirements. |
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 | AD7738BRUZ | AD7734BRU |
|---|---|---|
| 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 |
| Input Type | Differential, Single Ended | 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 are the primary differences between the AD7738BRUZ and the AD7734BRU?
The AD7738BRUZ is an 8-channel, 24-bit sigma-delta ADC with a maximum throughput of 15.4 kSPS, while the AD7734BRU is a 4-channel, 24-bit sigma-delta ADC with a maximum throughput of 15.4 kSPS. The AD7738BRUZ provides twice the input channel count of the AD7734BRU, but both share the same 24-bit resolution and similar throughput capabilities.
Are the AD7738BRUZ and AD7734BRU pin-compatible?
No. The AD7738BRUZ is supplied in a 28-lead TSSOP package, whereas the AD7734BRU is supplied in a 24-lead TSSOP package. The different package sizes and pin counts mean the two devices are not pin-compatible and cannot be dropped into the same PCB footprint without redesign.
Can the AD7734BRU be used as a direct substitute for the AD7738BRUZ in an existing design?
No. Because the AD7738BRUZ has 8 input channels in a 28-lead TSSOP and the AD7734BRU has 4 input channels in a 24-lead TSSOP, a direct substitution is not possible. Any replacement requires verifying channel count requirements, package footprint, and pin function differences against the respective manufacturer datasheets.
Do both the AD7738BRUZ and AD7734BRU support the same supply voltage range?
Both devices operate from a single 5 V analog supply (AVDD) and a 2.7 V to 3.6 V digital supply (DVDD), consistent with the AD773x family specifications. Designers should confirm the exact limits in the respective datasheets before finalizing power supply designs.
What is the resolution and throughput of each device?
Both the AD7738BRUZ and AD7734BRU are 24-bit sigma-delta ADCs with a maximum throughput of 15.4 kSPS. The primary distinction is channel count: the AD7738BRUZ offers 8 single-ended or 4 differential input channels, while the AD7734BRU offers 4 single-ended or 2 differential input channels.
Which device should be selected for an application requiring more analog input channels?
The AD7738BRUZ should be selected when more analog input channels are required, as it provides 8 input channels compared with 4 channels on the AD7734BRU. Both devices share 24-bit resolution and 15.4 kSPS maximum throughput, so channel count is the primary selection criterion between the two.
Do both parts support the same serial interface?
Yes. Both the AD7738BRUZ and AD7734BRU provide a serial interface compatible with SPI, QSPI, MICROWIRE, and DSP standards, consistent with the AD773x family. This allows either device to be interfaced with common microcontrollers and digital signal processors using standard serial protocols.