Part A
AD7918BRUZ
テキサス・インスツルメンツ
- Lifecycle
- Active
- Stock
- 6808 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
Not a drop-in replacement
The AD7918BRUZ and AD7910AKS-500RL7 are not drop-in replacements for one another. The AD7918BRUZ is an 8-channel, 10-bit successive-approximation ADC in a 20-lead TSSOP package with a serial interface, while the AD7910AKS-500RL7 is a single-channel, 10-bit ADC in a 6-lead SC-70 package. The two devices differ in channel count, package footprint, pin configuration, and interface architecture, so substituting one for the other requires a board redesign and cannot be treated as a direct functional swap.
Different channel count
Different package footprint
Different pin configuration
Different interface architecture
Parts at a glance
Part B
AD7910AKS-500RL7
テキサス・インスツルメンツ
- Lifecycle
- Active
- Stock
- 3223 個数
- Package
- SC-88
- Series
- データ取得 - アナログ/デジタルコンバータ (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 | AD7918BRUZ | AD7910AKS-500RL7 | Why it matters |
|---|---|---|---|
| Resolution (bits) | 10 | 10 | Both are 10-bit ADCs, so quantization step size is equivalent for a given reference. |
| Number of input channels | 8 | 1 | Channel count determines how many analog signals can be sampled; the AD7918 supports 8 single-ended inputs while the AD7910 supports only one. |
| Sampling rate (max) | 1 MSPS | 250 kSPS | Maximum throughput limits the highest signal frequency that can be digitized without aliasing. |
| Supply voltage (VDD) | 2.7 V to 5.25 V | 2.35 V to 5.25 V | Operating supply range affects compatibility with the system power rail and allowable analog input span. |
| Interface type | SPI / QSPI / MICROWIRE / DSP compatible serial | SPI / QSPI / MICROWIRE / DSP compatible serial | Serial interface compatibility determines whether the part can drop into an existing digital bus without glue logic. |
| Package | 16-lead TSSOP | 6-lead SC70 | Footprint and pin count must match the PCB layout for a direct substitution. |
| Input type | Single-ended | Single-ended | Input configuration must match the sensor or signal source topology (single-ended vs differential). |
| Operating temperature range | -40 °C to +85 °C | -40 °C to +85 °C | Temperature range must cover the application environment for reliable operation. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD7918BRUZ | AD7910AKS-500RL7 |
|---|---|---|
| Supplier | - | Rochester Electronics, LLC |
| Part Status | Active | Obsolete |
| Number of Bits | 10 | 10 |
| Sampling Rate(Per Second) | 1M | 250k |
| Data Interface | SPI, DSP | SPI, DSP |
| Number of A/D Converters | 1 | 1 |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
| Number of Inputs | 8 | - |
| Input Type | Single Ended | - |
| Configuration | MUX-S/H-ADC | - |
| Ratio - S / H: ADC | 1:1 | - |
| Architecture | SAR | - |
| Reference Type | External | - |
| Voltage - Supply, Analog | 2.7V ~ 5.25V | - |
| Voltage - Supply, Digital | 2.7V ~ 5.25V | - |
Frequently asked questions
What are the key differences between the AD7918BRUZ and the AD7910AKS-500RL7?
The AD7918BRUZ is an 8-channel, 10-bit successive-approximation ADC in a 20-lead TSSOP package, while the AD7910AKS-500RL7 is a single-channel, 10-bit successive-approximation ADC in a 6-lead SC-70 package. The AD7918 offers multiple input channels and a faster throughput rate, whereas the AD7910 is a smaller, single-channel device intended for space-constrained designs.
Are the AD7918BRUZ and AD7910AKS-500RL7 pin-compatible or package-compatible?
No. The AD7918BRUZ uses a 20-lead TSSOP package, and the AD7910AKS-500RL7 uses a 6-lead SC-70 package. The pin counts, pin functions, and PCB land patterns differ, so they are not drop-in replacements for each other.
What are the resolution and throughput specifications of these two ADCs?
Both devices provide 10-bit resolution. The AD7918BRUZ offers a throughput rate of up to 1 MSPS, while the AD7910AKS-500RL7 provides a throughput rate of up to 250 kSPS. The higher throughput of the AD7918 makes it suitable for faster multi-channel sampling applications.
How do the input channel configurations differ between the AD7918BRUZ and AD7910AKS-500RL7?
The AD7918BRUZ provides 8 single-ended input channels, allowing multiple analog signals to be multiplexed into a single ADC. The AD7910AKS-500RL7 provides a single analog input channel, making it appropriate for designs that need to digitize only one signal.
What are the supply voltage and interface requirements for these devices?
Both the AD7918BRUZ and AD7910AKS-500RL7 operate from a single 2.7 V to 5.25 V supply and use a serial SPI-compatible interface for communication with a host controller. This allows both parts to interface with common microcontrollers and DSPs using standard serial ports.
Which part is better suited for a compact, single-channel measurement design?
The AD7910AKS-500RL7 is better suited for compact single-channel designs because it is housed in a 6-lead SC-70 package and provides one analog input channel. The AD7918BRUZ, with its 20-lead TSSOP package and 8 input channels, is intended for multi-channel systems where board space is less constrained.
Can the AD7910AKS-500RL7 be used as a direct substitute for the AD7918BRUZ in an existing design?
No. The two devices differ in package type, pin count, number of input channels, and throughput rate. A direct substitution would require redesigning the PCB layout and verifying that the single-channel, lower-throughput AD7910 meets the system requirements, so the change must be validated against the manufacturer datasheets before use.