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 ADV7122KST50 is not a drop-in replacement for the ADV7123KST140. Although both are triple 10-bit high-speed video DACs in the same 48-lead LQFP package, the ADV7123KST140 offers a significantly higher maximum conversion rate (140 MSPS versus 50 MSPS) and a different analog output configuration, so the two parts are not functionally interchangeable in a given design.
Different maximum sample rate
Different analog output configuration
Different supply current
Different power dissipation
Parts at a glance
Part B
ADV7122KST50
ADI公司
- Lifecycle
- Active
- Stock
- 7666 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 | ADV7122KST50 | 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 sampling / clock rate | 140 MSPS | 50 MSPS | Higher clock rate supports higher pixel resolutions and refresh rates; the 140 MSPS part can drive much higher bandwidth displays. |
| Output current range | 0 to 26.5 mA (typical, adjustable) | 0 to 26.5 mA (typical, adjustable) | Output current sets analog signal drive level; matching ranges allow similar video signal amplitude. |
| Supply voltage | 5 V (single supply) | 5 V (single supply) | Supply voltage must match the system rail; both operate from a 5 V supply. |
| Package | 48-lead LQFP | 48-lead LQFP | Package compatibility affects PCB footprint and assembly; identical packages ease substitution. |
| Input interface | TTL-compatible parallel RGB inputs | TTL-compatible parallel RGB inputs | Interface compatibility determines whether the DAC can connect directly to the graphics source. |
| Operating temperature range | 0°C to +70°C (commercial) | 0°C to +70°C (commercial) | Temperature range affects suitability for the target environment; both are commercial-grade. |
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 | ADV7122KST50 |
|---|---|---|
| Supplier | - | Rochester Electronics, LLC |
| Part Status | Obsolete | Obsolete |
Frequently asked questions
What are the key differences between the ADV7123KST140 and ADV7122KST50?
The ADV7123KST140 is a triple 10-bit high-speed video DAC with a maximum conversion rate of 140 MSPS, while the ADV7122KST50 is a triple 8-bit video DAC with a maximum conversion rate of 50 MSPS. The ADV7123 offers higher resolution (10-bit vs 8-bit) and a faster clock rate (140 MSPS vs 50 MSPS), making it suitable for higher-resolution and higher-refresh-rate display applications.
Are the ADV7123KST140 and ADV7122KST50 pin-compatible?
Both devices are offered in a 48-lead LQFP package (suffix "ST"), and Analog Devices designed the ADV7122/ADV7123 family with a common pinout to support upgrade paths. However, designers should verify pin function assignments against the respective datasheets before substituting, since the 10-bit data bus of the ADV7123 uses additional data input pins compared with the 8-bit ADV7122.
What is the resolution and sampling rate of each device?
The ADV7123KST140 provides three 10-bit DACs operating at up to 140 MSPS. The ADV7122KST50 provides three 8-bit DACs operating at up to 50 MSPS. The "140" and "50" suffixes in the part numbers denote the respective maximum conversion rates.
What output interface do these DACs provide?
Both the ADV7123 and ADV7122 are triple video DACs with complementary current outputs (IOUT and IOUT-bar) intended for driving analog RGB video signals into a 75-ohm terminated load, typically through an external resistor network. They accept digital RGB pixel data and a clock input, and include on-chip reference and control functions for video display applications.
What supply voltage do the ADV7123KST140 and ADV7122KST50 require?
Both devices operate from a single 5 V supply (VAA = 5 V) with a separate digital supply (VDD) of 5 V, consistent with the Analog Devices ADV7122/ADV7123 datasheets. Designers should confirm the exact supply and ground pin requirements in the official datasheet for the specific grade.
Can the ADV7122KST50 be replaced by the ADV7123KST140 in an existing design?
Replacement is possible only after validating the differences: the ADV7123 provides 10-bit data inputs versus 8-bit on the ADV7122, a higher maximum clock rate (140 MSPS vs 50 MSPS), and potentially different power consumption. The PCB data bus routing, clock source, and timing margins must be reviewed against the ADV7123 datasheet before substitution.
What are the typical applications for each device?
The ADV7123KST140, with its 10-bit resolution and 140 MSPS rate, is suited to high-resolution color graphics, high-refresh-rate CRT/LCD display drivers, and professional video systems. The ADV7122KST50, with 8-bit resolution and 50 MSPS, targets standard-resolution RGB video display and lower-bandwidth graphics applications where 8-bit color depth is sufficient.
Do both parts include an on-chip voltage reference?
Yes, the ADV7122 and ADV7123 families integrate an on-chip reference circuit that can be used to set the DAC full-scale output current, with the option to override it using an external reference. The exact reference voltage and full-scale current adjustment range should be confirmed in the respective Analog Devices datasheets.