Part A
AD7327BRUZ
Công ty Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 3453 PCS
- Package
- TSSOP-20
- Series
- Data Acquisition - Analog to Digital Converters (ADC)
Replacement verdict
Compatible functional replacement candidate
The AD7321BRUZ and AD7327BRUZ share the same TSSOP-20 footprint, 12-bit SAR architecture, and software-selectable input ranges, making the AD7327BRUZ a viable functional upgrade where additional single-ended channels are required. However, the differing channel count and throughput rate require validation against the target application's timing and signal-chain requirements before substitution.
Channel Count
Validation required
Package Type
High match
Throughput Rate
Validation required
Resolution
High match
Parts at a glance
Part B
AD7321BRUZ
Công ty Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 7731 PCS
- Package
- TSSOP-14
- Series
- Data Acquisition - 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 | AD7321BRUZ | AD7327BRUZ | Why it matters |
|---|---|---|---|
| Number of ADC Channels | 2 (single-ended) / 2 (differential) | 8 (single-ended) / 4 (differential) | Channel count determines how many analog signals can be monitored; the AD7327 supports four times as many single-ended inputs, so it is not a drop-in substitute where more channels are required. |
| Resolution | 12 bits plus sign (13-bit) | 12 bits plus sign (13-bit) | Resolution sets the smallest measurable signal step; both parts offer the same 13-bit signed output, so measurement precision is equivalent. |
| Input Voltage Range | ±10 V, ±5 V, ±2.5 V, 0 to +10 V (software selectable) | ±10 V, ±5 V, ±2.5 V, 0 to +10 V (software selectable) | Selectable bipolar/unipolar ranges allow direct interface to a wide variety of sensors and signals; identical ranges mean both parts suit the same signal chain. |
| Throughput Rate | 500 kSPS | 500 kSPS | Maximum sampling rate limits the bandwidth of signals that can be digitized; equal throughput means timing performance is interchangeable. |
| Supply Voltage | 2.7 V to 16.5 V (VDD/VSS), VCC 2.7 V to 5.25 V | 2.7 V to 16.5 V (VDD/VSS), VCC 2.7 V to 5.25 V | Supply requirements determine power-rail compatibility; matching rails allow the same power design to be reused. |
| Interface Type | SPI / QSPI / MICROWIRE / DSP compatible serial | SPI / QSPI / MICROWIRE / DSP compatible serial | Serial interface compatibility ensures the same microcontroller or DSP can drive either part without firmware changes. |
| Package | 20-lead TSSOP (RUZ) | 20-lead TSSOP (RUZ) | Package footprint and pin count affect PCB layout; identical TSSOP packages allow the same land pattern, though pin functions differ. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Temperature range defines the environments in which the part is guaranteed to meet specifications; identical ranges mean equal environmental suitability. |
| Power Consumption | Typically 17 mW at 500 kSPS (5 V VCC) | Typically 17 mW at 500 kSPS (5 V VCC) | Power draw affects thermal budget and battery life; comparable consumption means similar system-level power impact. |
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 | AD7327BRUZ | AD7321BRUZ |
|---|---|---|
| Series | iCMOS® | iCMOS® |
| Part Status | Active | Active |
| Number of Bits | 12 | 12 |
| Sampling Rate(Per Second) | 500k | 500k |
| Number of Inputs | 2, 3, 4 | 1, 2 |
| Input Type | Differential, Pseudo-Differential, Single Ended | Differential, Pseudo-Differential, 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, Internal | External, Internal |
| Voltage - Supply, Analog | ±12V ~ 16.5V | ±12V ~ 16.5V |
| Voltage - Supply, Digital | 2.7V ~ 5.25V | 2.7V ~ 5.25V |
| Features | Temperature Sensor, True Bipolar | True Bipolar |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
Frequently asked questions
What are the primary differences between the AD7321BRUZ and AD7327BRUZ?
The AD7321BRUZ is a 2-channel, 12-bit plus sign successive approximation ADC, while the AD7327BRUZ is an 8-channel, 12-bit plus sign ADC. Both are bipolar input, software-selectable ADCs from Analog Devices in a 20-lead TSSOP (RUZ) package, but the AD7327 offers six additional input channels and includes a sequencer for multi-channel scanning.
Are the AD7321BRUZ and AD7327BRUZ pin-compatible?
No. Although both devices are housed in a 20-lead TSSOP (RUZ) package, they are not pin-compatible. The AD7321BRUZ uses its pins for two analog inputs plus a channel sequencer control, while the AD7327BRUZ uses the additional pins for six more analog input channels (VIN0 through VIN7). Pin functions and PCB land patterns must be verified against the respective datasheets before any substitution.
Do both devices support the same analog input voltage ranges?
Yes. Both the AD7321BRUZ and AD7327BRUZ support software-selectable bipolar input ranges of ±10 V, ±5 V, and ±2.5 V, as well as a 0 V to +10 V unipolar range, when operating from the specified ±12 V to ±16.5 V supplies (VDD/VSS) with VCC of 2.7 V to 5.25 V. The input range selection is programmed through the control register on both parts.
What is the resolution and throughput of the AD7321BRUZ and AD7327BRUZ?
Both devices provide 12-bit resolution plus a sign bit (13-bit bipolar output format) and support a maximum throughput rate of 500 kSPS. The AD7327BRUZ achieves this rate across its 8 channels using its on-chip sequencer, while the AD7321BRUZ applies the same conversion rate to its 2 channels.
Do both ADCs use the same digital interface?
Yes. Both the AD7321BRUZ and AD7327BRUZ feature a serial SPI/QSPI/MICROWIRE/DSP-compatible interface with a 16-bit register structure for control and data transfer. The AD7327BRUZ additionally provides a sequencer that allows automatic cycling through the selected analog input channels, which is not available on the 2-channel AD7321BRUZ.
Can the AD7321BRUZ be used as a drop-in replacement for the AD7327BRUZ in an existing design?
No. Because the two devices differ in channel count, pin functions, and the presence of an on-chip sequencer on the AD7327BRUZ, a direct drop-in replacement is not possible. Any substitution requires a full review of the schematic, PCB layout, firmware register map, and channel-scanning requirements against the target device datasheet.
What are the operating temperature ranges for the AD7321BRUZ and AD7327BRUZ?
Both the AD7321BRUZ and AD7327BRUZ are specified for the industrial temperature range of −40°C to +85°C, consistent with the B grade and RUZ (20-lead TSSOP) package suffix indicated in the Analog Devices datasheets.
Which device should be selected for multi-channel bipolar signal acquisition?
The AD7327BRUZ is the appropriate choice when more than two bipolar input channels must be acquired, since it provides 8 analog inputs with an on-chip sequencer for automatic channel scanning. The AD7321BRUZ is suitable only for designs requiring up to two bipolar input channels, where board space and channel count are limited.