Part A
AD7732BRUZ
Công ty Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 6723 PCS
- Package
- TSSOP-28
- Series
- Data Acquisition - Analog to Digital Converters (ADC)
Replacement verdict
Compatible functional replacement candidate
The AD7734BRU is a functional replacement candidate for the AD7732BRUZ, sharing the same 24-bit sigma-delta architecture, TSSOP-28 footprint, and SPI interface, but it provides four differential input channels instead of two and supports a narrower analog input range. Designers must validate channel count requirements and input signal range before substituting.
Channel Count
Validation required
Analog Input Range
Validation required
Package Type
High match
Resolution
High match
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | AD7732BRUZ | AD7734BRU | Why it matters |
|---|---|---|---|
| Number of Input Channels | 2 differential | 4 single-ended / 4 pseudo-differential | Channel count determines how many sensor signals can be measured by a single device; a 2-channel part cannot directly replace a 4-channel part in multi-sensor designs. |
| Input Configuration | Differential only | Single-ended or pseudo-differential | The input topology must match the sensor wiring; differential inputs reject common-mode noise while single-ended inputs simplify wiring for ground-referenced signals. |
| Resolution | 24 bits | 24 bits | Both provide 24-bit sigma-delta conversion, so resolution-dependent accuracy and dynamic range are equivalent between the two parts. |
| Interface | SPI / 3-wire serial | SPI / 3-wire serial | A matching serial interface allows the same host microcontroller and firmware communication layer to be reused. |
| Supply Voltage (Analog) | 5 V | 5 V | Identical analog supply requirements mean the same power rail design can support either device. |
| Package | 28-lead TSSOP | 28-lead TSSOP | Package and pin count affect PCB footprint and layout; matching packages simplify board-level substitution, though pinout must still be verified. |
| Operating Temperature Range | -40°C to +105°C | -40°C to +105°C | Equivalent temperature ratings ensure both parts suit the same industrial environments without derating concerns. |
| Data Output Rate | Up to 15.4 kSPS | Up to 15.4 kSPS | Matching maximum output rates mean similar throughput capability for the same signal bandwidth requirements. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD7732BRUZ | 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 | 2 | 4 |
| Input Type | 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 |
| Operating Temperature | -40°C ~ 105°C | -40°C ~ 105°C |
Frequently asked questions
What are the primary differences between the AD7732BRUZ and the AD7734BRU?
The AD7732BRUZ is a 2-channel, 24-bit sigma-delta ADC, while the AD7734BRU is a 4-channel, 24-bit sigma-delta ADC. Both are pin-compatible members of the AD7732/AD7734/AD7738 family and share the same TSSOP-28 package, but the AD7734BRU provides twice the input channel count. The AD7732BRUZ is specified as a RoHS-compliant part (Z suffix), whereas the AD7734BRU is the non-RoHS version of the 4-channel device.
Are the AD7732BRUZ and AD7734BRU pin-compatible and package-compatible?
Yes. Both devices are offered in a 28-lead TSSOP package and belong to the same AD7732/AD7734/AD7738 family, which is designed with a common pinout. This allows a single PCB layout to accommodate either the 2-channel AD7732BRUZ or the 4-channel AD7734BRU, subject to verification against the respective datasheets for any channel-specific pin functions.
Do the AD7732BRUZ and AD7734BRU have the same resolution and ADC architecture?
Yes. Both are 24-bit sigma-delta (Σ-Δ) analog-to-digital converters with the same resolution and conversion architecture. The primary functional distinction is the number of differential input channels: two for the AD7732BRUZ and four for the AD7734BRU.
What is the difference in RoHS compliance between the AD7732BRUZ and AD7734BRU?
The AD7732BRUZ carries the "Z" suffix, which Analog Devices uses to denote RoHS-compliant packaging. The AD7734BRU, without the Z suffix, is the non-RoHS variant. Designs requiring RoHS compliance should use the Z-suffixed ordering code; the AD7734BRU should be selected only where non-RoHS parts are acceptable.
Can the AD7732BRUZ be used as a drop-in replacement for the AD7734BRU?
Not as a functional drop-in replacement. Although the devices share the same package and family pinout, the AD7732BRUZ provides only two input channels versus four on the AD7734BRU. A design that requires four channels cannot be served by the AD7732BRUZ. Replacement in the reverse direction (AD7734BRU for AD7732BRUZ) may be feasible where the extra channels are unused, but channel-count, firmware configuration, and RoHS requirements must be validated against the datasheets.
Do both devices support the same digital interface and supply requirements?
Both devices are members of the same AD7732/AD7734/AD7738 family and share the family's serial interface and supply architecture as documented in their respective datasheets. Because they are family parts, the digital interface and supply rail structure are common; however, designers should confirm exact timing, register maps, and supply limits against the specific datasheet for the chosen channel count before finalizing a design.
Which part should be selected for a multi-channel precision measurement design?
For applications requiring four differential input channels, the AD7734BRU is the appropriate choice within this pair. For designs needing only two channels, the AD7732BRUZ offers the same 24-bit sigma-delta conversion in the same package with RoHS compliance. Selection should be based on required channel count, RoHS status, and confirmation of all parameters against the official Analog Devices datasheets.