Part A
AD7928BRUZ
テキサス・インスツルメンツ
- Lifecycle
- Active
- Stock
- 5202 個数
- Package
- TSSOP-20
- 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 AD7927BRU is a viable functional replacement candidate for the AD7928BRUZ in many applications, sharing the same 12-bit SAR architecture, 20-lead TSSOP footprint, and serial interface, though the reduced channel count and lower throughput must be validated against the target design's sampling requirements.
Resolution
High match
Channel Count
Validation required
Throughput Rate
Validation required
Package Type
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 | AD7928BRUZ | AD7927BRU | Why it matters |
|---|---|---|---|
| Number of ADC Channels | 8 | 8 | Channel count determines how many analog signals can be sampled; both are 8-channel, so channel capacity is equivalent. |
| Resolution | 12 bit | 12 bit | Resolution sets the smallest detectable analog step; identical 12-bit resolution means comparable measurement precision. |
| Sampling Rate | 1 MSPS | 200 kSPS | Maximum throughput limits how fast signals can be digitized; the AD7928 supports 5x higher sampling, affecting high-frequency applications. |
| Supply Voltage (Analog) | 2.7 V to 5.25 V | 2.7 V to 5.25 V | Analog supply range determines compatibility with system rails; both share the same range, easing power design substitution. |
| Interface Type | SPI / QSPI / MICROWIRE / DSP compatible | SPI / QSPI / MICROWIRE / DSP compatible | Serial interface compatibility ensures the part can drop into the same digital bus; both support the same serial protocols. |
| Input Type | Single-ended | Single-ended | Input configuration affects signal conditioning requirements; both are single-ended, so front-end circuitry can remain the same. |
| Package / Case | 20-TSSOP | 20-TSSOP | Package footprint must match the PCB layout; identical TSSOP-20 packages allow physical drop-in replacement. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Temperature range defines environmental limits; identical industrial ranges mean equivalent thermal robustness. |
| Power Consumption (Typical) | 6 mW at 1 MSPS | 2 mW at 200 kSPS | Power draw affects thermal and energy budgets; the higher-speed AD7928 consumes more power, which may matter in low-power designs. |
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 | AD7928BRUZ | AD7927BRU |
|---|---|---|
| Supplier | - | Analog Devices Inc.,Rochester Electronics, LLC |
| Part Status | Active | Obsolete |
| Number of Bits | 12 | 12 |
| Sampling Rate(Per Second) | 1M | 200k |
| Number of Inputs | 8 | 8 |
| Input Type | Single Ended | Single Ended |
| Data Interface | SPI, DSP | SPI, DSP |
| Configuration | MUX-S/H-ADC | MUX-S/H-ADC |
| Ratio - S / H: ADC | 1:1 | 1:1 |
| Number of A/D Converters | 1 | 1 |
| Architecture | SAR | SAR |
| Reference Type | External | External |
| Voltage - Supply, Analog | 2.7V ~ 5.25V | 2.7V ~ 5.25V |
| Voltage - Supply, Digital | 2.7V ~ 5.25V | 2.7V ~ 5.25V |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
Frequently asked questions
What are the key differences between the AD7928BRUZ and the AD7927BRU?
The AD7928BRUZ is an 8-channel, 12-bit successive-approximation ADC, while the AD7927BRU is an 8-channel, 12-bit ADC with a different channel configuration and throughput specification. The AD7928 offers eight single-ended inputs or four pseudo-differential inputs, whereas the AD7927 provides eight single-ended inputs with a sequencer. Both are specified for a 2.7 V to 5.25 V supply and are housed in a 20-lead TSSOP package.
Are the AD7928BRUZ and AD7927BRU pin-compatible?
Both devices are offered in a 20-lead TSSOP (RU-20) package, but pin compatibility must be confirmed against the respective manufacturer datasheets. The AD7928 and AD7927 share a similar pinout family, yet the analog input configuration and control pin functions differ, so a direct drop-in replacement should not be assumed without verifying the pin assignments in the official Analog Devices datasheets.
What is the maximum throughput rate of each device?
The AD7928BRUZ provides a throughput rate of up to 1 MSPS. The AD7927BRU is specified at up to 200 kSPS. These rates are documented in the respective Analog Devices datasheets and should be considered when selecting a device for a given sampling requirement.
Do both parts support the same serial interface?
Yes. Both the AD7928BRUZ and AD7927BRU use an SPI-compatible serial interface for communication with a host controller. The interface supports standard SPI modes and allows daisy-chaining of multiple devices, as described in the Analog Devices datasheets for each part.
What is the analog input configuration of each device?
The AD7928BRUZ offers eight single-ended analog inputs or four pseudo-differential input pairs, selectable via the control register. The AD7927BRU provides eight single-ended analog inputs with a channel sequencer. The input range is 0 V to VREF for both devices, with VREF ranging from 0.5 V to VDD.
Can the AD7927BRU be used as a replacement for the AD7928BRUZ in an existing design?
Substitution requires careful evaluation. Although both are 12-bit, 8-channel ADCs in a 20-lead TSSOP package, they differ in throughput (1 MSPS vs 200 kSPS), input configuration, and control register behavior. The system firmware, timing, and analog front-end must be validated against the AD7927BRU datasheet before replacing the AD7928BRUZ.
What are the power supply requirements for both devices?
Both the AD7928BRUZ and AD7927BRU operate from a single supply voltage of 2.7 V to 5.25 V. The digital interface supply (VDRIVE) is separate and can range from 2.7 V to VDD, allowing direct connection to 3 V or 5 V logic. These specifications are stated in the Analog Devices datasheets.