Part A
AD7997BRUZ-0
ADI公司
- Lifecycle
- Active
- Stock
- 3591 件
- Package
- TSSOP-20
- Series
- 資料獲取-模數轉換器（ADC）
Replacement verdict
Not a drop-in replacement
The AD7997BRUZ-0 and AD7993BRU-1 are not drop-in replacements for one another. Although both are 4-channel, 10-bit I2C ADCs from Analog Devices in TSSOP packages, they differ in resolution, channel count, and package pinout, so the AD7993BRU-1 cannot be substituted directly for the AD7997BRUZ-0 without design validation.
Different resolution
Different channel count
Different package pinout
Different conversion rate
Parts at a glance
Part B
AD7993BRU-1
ADI公司
- Lifecycle
- Active
- Stock
- 2055 件
- Package
- TSSOP-16
- Series
- 資料獲取-模數轉換器（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 | AD7997BRUZ-0 | AD7993BRU-1 | Why it matters |
|---|---|---|---|
| Number of ADC Channels | 8 | 4 | Determines how many analog signals can be sampled; an 8-channel part cannot directly replace a 4-channel design without unused inputs being handled. |
| Resolution | 10 bit | 10 bit | Both provide 10-bit conversion, so measurement granularity is equivalent and no firmware scaling change is required. |
| Throughput / Sampling Rate | 188 kSPS | 188 kSPS | Identical maximum conversion rate means timing budgets and sampling loops remain valid across both parts. |
| Supply Voltage Range | 2.7 V to 5.5 V | 2.7 V to 5.5 V | Matching supply range allows either device to operate from the same rail without regulator or level-shifting changes. |
| Interface | I2C (2-wire) | I2C (2-wire) | Same serial interface protocol means the host controller driver and bus wiring are compatible between the two parts. |
| Package | 16-lead TSSOP | 16-lead TSSOP | Identical package and pin count allow a drop-in footprint match on the PCB, though pin functions must still be verified. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Same industrial temperature range ensures both parts meet the same environmental requirements in the application. |
| Input Type | Single-ended | Single-ended | Both accept single-ended analog inputs, so signal conditioning circuitry can remain unchanged. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD7997BRUZ-0 | AD7993BRU-1 |
|---|---|---|
| Supplier | - | Analog Devices Inc.,Rochester Electronics, LLC |
| Part Status | Active | Obsolete |
| Number of Bits | 10 | 10 |
| Sampling Rate(Per Second) | 188k | 188k |
| Number of Inputs | 8 | 4 |
| Input Type | Single Ended | Single Ended |
| Data Interface | I²C | I²C |
| 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 ~ 5.5V | 2.7V ~ 5.5V |
| Voltage - Supply, Digital | 2.7V ~ 5.5V | 2.7V ~ 5.5V |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 125°C |
Frequently asked questions
What are the key differences between the AD7997BRUZ-0 and AD7993BRU-1?
The AD7997BRUZ-0 is an 8-channel, 10-bit successive-approximation ADC with an I2C-compatible interface, housed in a 20-lead TSSOP (RU-20) package. The AD7993BRU-1 is a 4-channel, 10-bit SAR ADC with the same I2C interface, housed in a 16-lead TSSOP (RU-16) package. The primary differences are channel count (8 vs 4) and package pin count (20 vs 16). Both are specified for a 2.7 V to 5.5 V supply and offer a fast conversion time of 2 microseconds.
Can the AD7997BRUZ-0 be used as a drop-in replacement for the AD7993BRU-1?
No. The AD7997BRUZ-0 is a 20-lead TSSOP device while the AD7993BRU-1 is a 16-lead TSSOP device, so the packages and PCB land patterns are not compatible. In addition, the AD7997BRUZ-0 provides 8 analog input channels versus 4 on the AD7993BRU-1, so the pin functions and channel addressing differ. A direct drop-in substitution is not possible without a board redesign.
Do both parts share the same I2C interface and resolution?
Yes. Both the AD7997BRUZ-0 and AD7993BRU-1 are 10-bit successive-approximation ADCs with an I2C-compatible serial interface supporting standard, fast, and high-speed modes. Both feature a 2 microsecond conversion time and operate from a single 2.7 V to 5.5 V supply, so the digital interface protocol and resolution are common to both devices.
What is the difference in analog input channel count and how does it affect system design?
The AD7997BRUZ-0 offers 8 analog input channels, while the AD7993BRU-1 offers 4 analog input channels. For systems requiring more than four single-ended inputs, the AD7997BRUZ-0 avoids the need for an external multiplexer, whereas the AD7993BRU-1 suits designs with four or fewer monitored signals and a smaller 16-lead footprint.
Are the reference and supply voltage requirements the same for both devices?
Both devices operate from a single supply of 2.7 V to 5.5 V and support an external reference voltage applied to the VREF pin, as well as operation in a supply-referenced mode. The reference input range and supply decoupling requirements are consistent across the two parts, so reference design practices carry over between them.
Which package options are available for each device?
The AD7997BRUZ-0 is supplied in a 20-lead TSSOP (RU-20) package. The AD7993BRU-1 is supplied in a 16-lead TSSOP (RU-16) package. Both are RoHS-compliant TSSOP packages, but the different lead counts mean they occupy different board areas and require distinct land patterns.
Do both parts support the same conversion speed and throughput?
Yes. Both the AD7997BRUZ-0 and AD7993BRU-1 provide a 2 microsecond conversion time for a 10-bit result, enabling fast throughput over the I2C bus. The conversion timing and read-cycle behavior are common to both devices, so firmware timing considerations are largely transferable.
What should be verified before selecting between these two ADCs?
Confirm the required number of analog input channels (8 for the AD7997BRUZ-0 versus 4 for the AD7993BRU-1), the available PCB area and land pattern for a 20-lead versus 16-lead TSSOP, and the system supply and reference voltage. Both parts share 10-bit resolution, 2 microsecond conversion, and an I2C interface, so channel count and package are the decisive selection criteria.