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 ADV7122KST30 are not drop-in replacements for one another. Although both are triple 10-bit high-speed video DACs in the same 48-lead LQFP package, they differ in maximum sample rate, output drive configuration, and reference architecture, so the ADV7122KST30 cannot directly substitute for the ADV7123KST140 without design validation.
Different maximum sample rate
Different output drive current
Different reference architecture
Different power consumption
Parts at a glance
Part B
ADV7122KST30
ADI公司
- Lifecycle
- Active
- Stock
- 6038 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 | ADV7122KST30 | Why it matters |
|---|---|---|---|
| Resolution (DAC bits per channel) | 10-bit | 10-bit | Bit depth determines color precision; both are 10-bit, so color fidelity is comparable. |
| Number of DAC channels | 3 (RGB) | 3 (RGB) | Triple DACs are required for analog RGB output; both provide three channels. |
| Maximum DAC update rate / clock speed | 140 MSPS | 30 MSPS | Higher update rate supports higher pixel clocks and resolutions; the 140 MSPS part can drive much higher bandwidth displays. |
| Supply voltage | 5 V (single supply) | 5 V (single supply) | Supply voltage must match the system rail; both operate from a 5 V supply. |
| Output type | Current output (analog RGB) | Current output (analog RGB) | Current-output DACs require an external load resistor to develop voltage; both share the same output architecture. |
| Package | 48-lead LQFP | 48-lead LQFP | Package and pinout affect board layout and drop-in compatibility; both use the same 48-lead LQFP. |
| Input interface | TTL-compatible parallel digital input | TTL-compatible parallel digital input | Interface compatibility determines whether the part can connect directly to the graphics controller; both accept parallel TTL input. |
| On-chip reference | Internal 1.235 V reference | Internal 1.235 V reference | An internal reference simplifies design and improves accuracy; both include an on-chip reference. |
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 | ADV7122KST30 |
|---|---|---|
| Supplier | - | Rochester Electronics, LLC |
| Part Status | Obsolete | Obsolete |
Frequently asked questions
What are the primary differences between the ADV7123KST140 and ADV7122KST30?
The ADV7123KST140 is a triple 10-bit high-speed video DAC specified for 140 MSPS operation, while the ADV7122KST30 is a triple 10-bit video DAC specified for 30 MSPS operation. The ADV7123 offers higher speed and includes an on-chip reference, whereas the ADV7122 is a lower-speed device intended for applications such as lower-resolution or lower-refresh-rate video systems.
Are the ADV7123KST140 and ADV7122KST30 pin-compatible?
Both devices are offered in a 48-lead LQFP package, but pin compatibility must be confirmed against the respective Analog Devices datasheets. The ADV7123 includes additional control and reference functions that may affect pin assignments, so a direct drop-in replacement should not be assumed without verifying the pinout of each specific datasheet revision.
What is the maximum sampling rate of each device?
The ADV7123KST140 is specified for a maximum conversion rate of 140 MSPS. The ADV7122KST30 is specified for a maximum conversion rate of 30 MSPS. Designs requiring high-resolution, high-refresh-rate graphics should use the ADV7123, while the ADV7122 suits lower-bandwidth video applications.
Do both parts include an on-chip voltage reference?
The ADV7123 integrates an on-chip reference that can be used to set the full-scale output current, reducing external component count. The ADV7122 requires an external reference or current-setting resistor arrangement per its datasheet. Designers should review the reference architecture of each device before substituting one for the other.
What resolution do these DACs provide?
Both the ADV7123KST140 and ADV7122KST30 are triple 10-bit video DACs, providing 10 bits of resolution per color channel (RGB). This yields 1024 quantization levels per channel, suitable for high-color-depth graphics and video reconstruction.
Can the ADV7122KST30 be used as a replacement for the ADV7123KST140 in an existing design?
Substitution is not recommended without design validation. The ADV7122KST30 has a lower maximum sampling rate (30 MSPS versus 140 MSPS) and a different reference architecture, so pixel clock, output filtering, and reference circuitry must be re-evaluated. The target design's pixel rate and resolution requirements should be checked against the ADV7122 datasheet limits before replacement.
What package type do these devices use?
Both the ADV7123KST140 and ADV7122KST30 are supplied in a 48-lead LQFP (Low-profile Quad Flat Package). The "ST" suffix in the part number denotes this package option in Analog Devices' naming convention. PCB land patterns should be verified against the specific datasheet package drawing.
What supply voltage do these DACs require?
Both devices operate from a single +5 V supply (with a +3.3 V logic interface option on the ADV7123 family per datasheet). Designers should confirm the exact supply and logic interface requirements in the respective Analog Devices datasheets, as the ADV7122 and ADV7123 may differ in their digital input compatibility specifications.