Part A
ADV7123KST140
Компания Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 7401 ПКС
- Package
- LQFP-48
- Series
- Сбор данных - цифровые в аналоговые преобразователи (DAC)
Replacement verdict
Not a drop-in replacement
The ADV7123KST140 and ADV7120KST50 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 ADV7120KST50 cannot directly substitute for the ADV7123KST140 in an existing design without validation and possible circuit modification.
Different maximum sample rate
Different output drive configuration
Different reference architecture
Different power consumption
Parts at a glance
Part B
ADV7120KST50
Компания Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 5713 ПКС
- Package
- LQFP-48
- Series
- Сбор данных - цифровые в аналоговые преобразователи (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 | ADV7120KST50 | Why it matters |
|---|---|---|---|
| Resolution (DAC bits per channel) | 10-bit | 8-bit | Higher bit depth provides finer color gradation; a 10-bit part cannot be directly substituted where an 8-bit interface is expected without accounting for data alignment. |
| Maximum DAC update rate (sample clock) | 140 MSPS | 50 MSPS | Determines the maximum pixel rate and supported display resolution/refresh; the faster part supports higher-bandwidth video modes. |
| Number of DAC channels | 3 (RGB) | 3 (RGB) | Both are triple DACs for RGB video, so channel count is compatible for color graphics output. |
| Output current range | 2 mA to 26 mA | 2 mA to 26 mA | Analog output drive level affects compatibility with the downstream video buffer or termination network. |
| Supply voltage | 5 V (4.75 V to 5.25 V) | 5 V (4.75 V to 5.25 V) | Matching supply rails simplifies board-level substitution and power sequencing. |
| Package | 48-lead LQFP | 48-lead LQFP | Identical package and pin count allow potential drop-in replacement on an existing footprint, subject to pinout verification. |
| Input data format | 10-bit parallel RGB | 8-bit parallel RGB | The host graphics controller must match the DAC input width; a 10-bit part requires a wider data bus than an 8-bit part. |
| On-chip reference | Yes (1.235 V) | Yes (1.235 V) | An internal reference reduces external component count and keeps full-scale output consistent between the two 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 | ADV7120KST50 |
|---|---|---|
| Supplier | - | Rochester Electronics, LLC |
| Part Status | Obsolete | Obsolete |
Frequently asked questions
What are the key differences between the ADV7123KST140 and ADV7120KST50?
The ADV7123KST140 is a triple 10-bit high-speed video DAC rated for 140 MSPS, while the ADV7120KST50 is a triple 8-bit video DAC rated for 50 MSPS. The ADV7123 offers higher resolution (10-bit vs 8-bit) and a faster maximum conversion rate, making it suitable for higher-resolution and higher-refresh-rate video applications.
Are the ADV7123KST140 and ADV7120KST50 pin-compatible?
Both devices are offered in a 48-lead LQFP package, but pin compatibility must be verified against the respective manufacturer datasheets. The ADV7123 provides 10-bit input ports while the ADV7120 provides 8-bit input ports, so the digital input pin assignments and functions differ and a direct drop-in replacement should not be assumed without datasheet verification.
What is the maximum sampling rate of each device?
The ADV7123KST140 is specified for a maximum conversion rate of 140 MSPS. The ADV7120KST50 is specified for a maximum conversion rate of 50 MSPS. The higher rate of the ADV7123 supports higher pixel clock frequencies and higher display resolutions.
What resolution does each DAC provide?
The ADV7123KST140 provides three 10-bit DACs for red, green, and blue channels. The ADV7120KST50 provides three 8-bit DACs. The 10-bit resolution of the ADV7123 yields finer color depth (1024 levels per channel) compared with the 8-bit resolution of the ADV7120 (256 levels per channel).
What supply voltage do these devices require?
Both the ADV7123 and ADV7120 are designed to operate from a single +5 V supply, with a separate digital supply pin (VDD) and analog supply pin (VAA). Designers should confirm the exact recommended operating conditions in the respective datasheets before finalizing the power design.
What output configuration do these DACs provide?
Both devices provide complementary current outputs (IOUT and IOUT*) per channel, intended to drive a doubly-terminated 75 Ω load to produce standard video signal levels. The output current is set by an external reference resistor and the full-scale adjust control.
Which device should be selected for a given video design?
Selection depends on the required pixel clock and color depth. For designs requiring up to 50 MSPS and 8-bit color, the ADV7120KST50 is sufficient. For higher-resolution or higher-refresh-rate systems requiring up to 140 MSPS and 10-bit color, the ADV7123KST140 is the appropriate choice. Final selection should be validated against the target display timing and the manufacturer datasheets.