Part A
ADV7123KST140
ADI公司
- Lifecycle
- Active
- Stock
- 7401 件
- Package
- LQFP-48
- Series
- 資料獲取-數模轉換器（DAC）
Replacement verdict
Not a drop-in replacement
The ADV7123KST140 and ADV7120KST30 are both triple 10-bit high-speed video DACs in a 48-pin LQFP package, but they differ in maximum sample rate, output drive configuration, and reference architecture, so the ADV7120KST30 cannot be used as a direct drop-in substitute for the ADV7123KST140 without design validation.
Different maximum sample rate
Different output drive configuration
Different reference architecture
Different supply and power profile
Parts at a glance
Part B
ADV7120KST30
ADI公司
- Lifecycle
- Active
- Stock
- 3779 件
- Package
- LQFP-48
- Series
- 資料獲取-數模轉換器（DAC）
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | ADV7123KST140 | ADV7120KST30 | Why it matters |
|---|---|---|---|
| Resolution (DAC bits per channel) | 10-bit | 8-bit | Higher bit depth provides finer color gradation; a 10-bit DAC offers 4x the levels of an 8-bit DAC, affecting image quality and substitutability in color-critical designs. |
| Maximum DAC Update Rate (Sample Rate) | 140 MSPS | 30 MSPS | Determines the maximum pixel/clock rate supported; the higher-speed part can drive higher-resolution or higher-refresh displays, so they are not drop-in equivalents for high-bandwidth video. |
| Number of DAC Channels | 3 (RGB) | 3 (RGB) | Both integrate three DACs for red, green, and blue, so the channel architecture is functionally equivalent for RGB video output. |
| Input Data Interface | 10-bit parallel per channel | 8-bit parallel per channel | The input bus width must match the host graphics source; a 10-bit interface cannot directly accept 8-bit data without padding, affecting board-level compatibility. |
| Output Type | Current output (analog RGB) | Current output (analog RGB) | Both provide current-mode analog outputs requiring external load resistors, so the analog output topology is compatible for substitution. |
| Supply Voltage | 5 V (single supply) | 5 V (single supply) | Matching supply voltage simplifies power-rail reuse when considering a replacement in an existing design. |
| Package | 48-lead LQFP | 48-lead LQFP | Identical package and pin count allow potential PCB footprint reuse, though pinout differences must still be verified. |
| On-chip Reference | Internal reference available | Internal reference available | An internal voltage reference reduces external component count and simplifies analog biasing in both parts. |
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 | ADV7123KST140 | ADV7120KST30 |
|---|---|---|
| Supplier | - | Rochester Electronics, LLC |
| Part Status | Obsolete | Obsolete |
Frequently asked questions
What are the key differences between the ADV7123KST140 and ADV7120KST30?
The ADV7123KST140 is a triple 10-bit high-speed video DAC with a maximum conversion rate of 140 MSPS, while the ADV7120KST30 is a triple 8-bit video DAC with a maximum conversion rate of 30 MSPS. The ADV7123 offers higher resolution (10-bit vs 8-bit) and a significantly faster clock rate, making it suitable for higher-resolution and higher-refresh-rate video applications.
Are the ADV7123KST140 and ADV7120KST30 pin-compatible?
Both devices are offered in a 48-lead LQFP package (suffix "ST"), and Analog Devices designed the ADV7123 as an upgrade path to the ADV7120 family with a compatible pinout. However, designers should verify the pin functions and any differences in the control and power supply pins against the respective datasheets before substituting one for the other on an existing PCB.
What is the maximum clock frequency of each device?
The ADV7123KST140 supports a maximum conversion rate of 140 MSPS, while the ADV7120KST30 supports a maximum conversion rate of 30 MSPS. The higher clock rate of the ADV7123 allows it to support higher pixel rates and resolutions, such as 1080p and beyond, whereas the ADV7120 is limited to lower-resolution video formats.
What resolution (bit depth) does each DAC provide?
The ADV7123KST140 provides three 10-bit DACs (one each for red, green, and blue), giving 1024 levels per channel. The ADV7120KST30 provides three 8-bit DACs, giving 256 levels per channel. The 10-bit resolution of the ADV7123 yields finer color gradation and reduced quantization artifacts compared with the 8-bit ADV7120.
Do both parts support the same video input formats and output standards?
Both are triple video DACs intended for RGB graphics and video applications and accept digital pixel data with separate sync and blanking controls. The ADV7123 supports higher pixel rates and 10-bit input data, while the ADV7120 accepts 8-bit input data at lower rates. Designers should confirm the specific input timing, sync polarity, and output compliance requirements in each datasheet for the target video standard.
Can the ADV7123KST140 be used as a drop-in upgrade for the ADV7120KST30?
Because the ADV7123 offers higher resolution and a faster clock rate in the same 48-lead LQFP package, it is often considered an upgrade path. However, a drop-in replacement requires verifying that the input data width (10-bit vs 8-bit), clock rate, power supply requirements, and control pin functions are compatible with the existing design. The system must be able to supply 10-bit pixel data and a clock up to 140 MSPS to fully benefit from the ADV7123.
What are the typical applications for each device?
The ADV7123KST140 is typically used in high-resolution video graphics, digital video processing, and high-refresh-rate display systems where 10-bit color and pixel rates up to 140 MSPS are required. The ADV7120KST30 is suited to lower-resolution RGB graphics, basic video display, and cost-sensitive applications operating at pixel rates up to 30 MSPS.
Do both devices operate from the same power supply voltage?
Both the ADV7123 and ADV7120 families are designed to operate from a single +5 V supply (with a +3.3 V option on some grades). Designers should confirm the exact supply voltage and current requirements for the specific "KST" grade in the respective Analog Devices datasheets, as power consumption differs between the 10-bit 140 MSPS ADV7123 and the 8-bit 30 MSPS ADV7120.