Part A
AD7923BRUZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 1788 Stückzahl
- Package
- TSSOP-16
- Series
- Datenerfassung mit Analog to Digital Converters (ADC)
Replacement verdict
Compatible functional replacement candidate
The AD7927BRUZ and AD7923BRUZ are functionally compatible 12-bit successive-approximation ADCs sharing the same TSSOP-20 footprint, SPI interface, and 2.7 V to 5.25 V supply range, making the AD7927BRUZ a viable replacement candidate for the AD7923BRUZ in most designs. The primary distinction is channel count: the AD7927BRUZ provides eight analog input channels versus four on the AD7923BRUZ, so the substitution is appropriate where the additional channels are either beneficial or unused, and where the higher throughput of the AD7927BRUZ is acceptable within the system timing budget.
Channel Count
High match
Package Type
High match
Digital Interface
High match
Throughput Rate
Validation required
Parts at a glance
Part B
AD7927BRUZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 2549 Stückzahl
- Package
- TSSOP-20
- Series
- Datenerfassung mit Analog to Digital Converters (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 | AD7927BRUZ | AD7923BRUZ | Why it matters |
|---|---|---|---|
| Number of ADC Input Channels | 8 | 4 | Determines how many analog signals can be multiplexed into the ADC; an 8-channel device can replace a 4-channel one only if the extra channels are unused or the board is redesigned. |
| Resolution | 12 bits | 12 bits | Both provide the same quantization step size, so measurement precision and LSB size are equivalent for a given reference voltage. |
| Maximum Throughput Rate | 200 kSPS | 200 kSPS | Identical sampling speed means timing budgets and anti-aliasing filter requirements remain unchanged when substituting parts. |
| Supply Voltage Range | 2.7 V to 5.25 V | 2.7 V to 5.25 V | Matching supply ranges allow the same power rail design to be reused without level shifting or regulator changes. |
| Analog Input Range | 0 V to VREF (single-ended) | 0 V to VREF (single-ended) | Same input span means signal conditioning and reference selection can remain identical across both parts. |
| Interface Type | SPI / QSPI / MICROWIRE / DSP compatible | SPI / QSPI / MICROWIRE / DSP compatible | Identical serial interface protocols ensure firmware and host controller connections work without modification. |
| Package | 20-Lead TSSOP | 16-Lead TSSOP | Different package footprints and pin counts require PCB layout changes; the parts are not drop-in replacements despite functional similarity. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Equivalent temperature ratings confirm both parts suit the same industrial-grade environmental conditions. |
| Power Consumption (Typical) | 3.5 mW at 3 V, 200 kSPS | 3.5 mW at 3 V, 200 kSPS | Same power draw keeps thermal and battery-life calculations valid when swapping between the two devices. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD7923BRUZ | AD7927BRUZ |
|---|---|---|
| Part Status | Active | Active |
| Number of Bits | 12 | 12 |
| Sampling Rate(Per Second) | 200k | 200k |
| Number of Inputs | 4 | 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 ~ 125°C | -40°C ~ 85°C |
Frequently asked questions
What are the primary differences between the AD7927BRUZ and AD7923BRUZ?
The AD7927BRUZ is an 8-channel, 12-bit successive approximation ADC with a throughput rate of 200 kSPS, while the AD7923BRUZ is a 4-channel, 12-bit successive approximation ADC with a throughput rate of 200 kSPS. Both are offered in a 20-lead TSSOP (RUZ) package and operate from a 2.7 V to 5.25 V single supply, but they differ in the number of analog input channels and corresponding digital interface timing.
Are the AD7927BRUZ and AD7923BRUZ pin-compatible?
No. Although both devices are housed in a 20-lead TSSOP package, the AD7927BRUZ provides eight analog input channels (VIN0 through VIN7) while the AD7923BRUZ provides only four (VIN0 through VIN3). The remaining pins on the AD7923BRUZ are assigned differently, so the two devices are not drop-in replacements and the PCB layout must be verified against each respective datasheet.
Do the AD7927BRUZ and AD7923BRUZ have the same resolution and throughput?
Yes. Both are 12-bit successive approximation ADCs specified for a maximum throughput rate of 200 kSPS, and both support a serial SPI/QSPI/MICROWIRE/DSP-compatible interface. The conversion time and AC performance specifications are comparable, but the channel count and multiplexer configuration differ.
What is the analog input configuration of each device?
The AD7927BRUZ has an 8-channel input multiplexer that can be configured for single-ended or pseudo-differential operation, with channel selection controlled through the serial interface. The AD7923BRUZ has a 4-channel multiplexer with the same single-ended/pseudo-differential capability. Both devices include a track-and-hold amplifier and an on-chip reference option.
Can the AD7923BRUZ be used as a substitute for the AD7927BRUZ in an existing design?
Only if the design requires no more than four analog input channels and the PCB layout is revised to match the AD7923BRUZ pinout. Because the two parts are not pin-compatible and the channel count differs, a direct substitution without layout and firmware changes is not supported by the manufacturer documentation.
What supply voltage and reference options do these ADCs support?
Both the AD7927BRUZ and AD7923BRUZ operate from a single 2.7 V to 5.25 V supply. Each device can use its internal reference or an externally applied reference voltage, and the analog input range is determined by the selected reference. These parameters are specified in the respective Analog Devices datasheets.
What package and operating temperature range do the AD7927BRUZ and AD7923BRUZ use?
Both devices are supplied in a 20-lead TSSOP package, indicated by the RUZ suffix, and are specified for the industrial temperature range of −40°C to +85°C. Designers should confirm the exact grade and ordering code against the Analog Devices datasheet before production release.