DS90UB948TNKDRQ1 TI Automotive FPD-Link III Deserializer 2K 192MHz Pixel Clock OpenLDI to LVDS Dual Link Audio Transmission WQFN-64

DS90UB948TNKDRQ1 Product Overview

The DS90UB948-Q1 is an automotive FPD-Link III deserializer from TI that, in conjunction with DS90UB949/947-Q1 serializers, converts single- or dual‑channel FPD‑Link III high‑speed serial streams into an OpenLDI (LVDS) interface format. The device supports pixel clocks up to 192MHz, enabling 2K (2048×1080) resolution with 24‑bit color depth, along with multi‑channel I2S audio transmission and full‑duplex control (I2C/SPI) over a single coaxial or twisted‑pair cable. The device is AEC-Q100 Grade 2 qualified with an operating temperature range of -40℃ to +105℃ and comes in a 9×9mm WQFN-64 package, making it suitable for in‑vehicle infotainment (IVI), digital instrument clusters, and rear‑seat entertainment displays.

DS90UB948TNKDRQ1 Core Features

The DS90UB948-Q1 is an FPD-Link III deserializer that, when paired with DS90UB949A/949/947-Q1 serializers, converts single‑ or dual‑channel FPD‑Link III streams into an FPD‑Link (OpenLDI) interface format. The deserializer operates over cost‑effective 50Ω single‑ended coaxial or 100Ω differential shielded twisted‑pair (STP) cables. It recovers data from one or two FPD‑Link III serial streams and translates it into a dual‑pixel FPD‑Link interface (8 LVDS data lanes + clock), supporting up to 2K (2048×1080) resolution with 24‑bit color depth.

The device receives a 35‑bit symbol, operating at up to 3.36Gbps line rate in 1‑lane FPD‑Link III mode and 2.975Gbps per lane in 2‑lane mode. The FPD‑Link III serial stream contains embedded clock, video control signals, and DC‑balanced video and audio data, supporting AC coupling for enhanced signal quality.

The FPD‑Link III interface supports video and audio data transmission and full‑duplex control, including I2C (1Mbps Fast‑Mode Plus) and SPI communication, over the same differential link. Consolidation of video data and control over two differential pairs reduces interconnect size, weight, and system complexity. EMI is minimised through low‑voltage differential signaling, data scrambling, and randomization.

The deserializer can lock to a data stream without using an external reference clock source, greatly simplifying system complexity and overall cost. It synchronises to the serializer regardless of the data pattern, delivering true automatic “plug‑and‑lock” performance without special training patterns or sync characters.

For pixel clock, single‑channel mode supports up to 96MHz, while dual‑channel mode supports up to 192MHz. It is configurable for 18‑bit RGB or 24‑bit RGB. In backward‑compatible mode, the device supports WXGA and 720p resolutions (24‑bit color depth) over a single differential link.

For audio, the device supports multi‑channel audio (up to 7.1 channels, via 4 data lanes) over the I2S interface. Audio data is transmitted over the FPD‑Link III interface and regenerated by the deserializer.

The DS90UB948-Q1 is functional safety‑capable, with documentation to aid ISO 26262 system design. The device includes four high‑speed GPIOs (up to 2Mbps each) capable of outputting two PWM signals with adjustable duty cycle – one for display backlight brightness control and another for a buzzer. The SPI control interface operates up to 3.3Mbps, and I2C supports 1Mbps Fast‑Mode Plus (controller/target).

The deserialiser features adaptive receive equalisation, compensating for channel insertion loss up to -15.5dB at 1.48GHz and -9dB at 1.68GHz, with automatic temperature and cable aging compensation for reliable long‑distance transmission.

The device supports image enhancement including white balance and dithering. It is backward‑compatible with earlier‑generation FPD‑Link III serializers such as DS90UB925Q-Q1, DS90UB925AQ-Q1, and DS90UB927Q-Q1 for easy system upgrades.

The device operates from a single 1.14V‑1.26V core supply, with VDDIO supporting 1.8V or 3.3V. The 9×9mm WQFN-64 package is ideal for space‑constrained automotive module designs. The device is hardware‑compatible with DS90UH948-Q1 (UH supports HDCP, UB does not), allowing pin‑compatible substitution.

DS90UB948TNKDRQ1 Applications

In‑Vehicle Infotainment (IVI) – Central Information Displays (CID)

Digital Instrument Clusters

Rear‑Seat Entertainment Systems

Automotive Display Extension (co‑driver display, HUD)

Industrial Display Applications

Video Bridging – Connect HDMI sources (e.g., GPUs) to existing LVDS displays

DS90UB948TNKDRQ1 Key Advantages

The DS90UB948-Q1 integrates video, audio, and bidirectional control signals onto a single differential link using FPD‑Link III technology, reducing wire harness count by over 70% compared to traditional LVDS solutions – significantly cutting weight, volume, and cost of in‑vehicle interconnects.

Supporting up to 2K (2048×1080) resolution with 24‑bit color depth and a 192MHz pixel clock, the device meets the high image quality demands of premium automotive display systems.

With a serial line rate up to 3.36Gbps and adaptive receive equalisation compensating for -15.5dB insertion loss at 1.48GHz, the device supports cable lengths up to 15 meters. Automatic temperature and cable aging compensation ensure reliable long‑distance transmission for large vehicles or distributed display systems.

Through I2C and SPI control signal pass‑through, the system host can directly access slave devices in remote displays via the serial link without additional control cables, simplifying system topology. Low‑voltage differential signaling and multiple EMI‑reduction techniques help meet stringent automotive EMC requirements.

The DS90UB948-Q1 is fully AEC-Q100 Grade 2 qualified, supporting -40℃ to +105℃ wide‑temperature operation for harsh automotive environments. It is hardware‑compatible with DS90UH948-Q1 for easy migration to HDCP‑capable designs, and backward‑compatible with older‑generation deserializers such as DS90UB926/928 for seamless system upgrades.

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FAQ:

1. What is the DS90UB948TNKDRQ1 and what is its main function?
   The DS90UB948 is an automotive‑qualified FPD‑Link III deserializer that converts a single‑ or dual‑lane FPD‑Link III serial stream back into parallel video and audio. It supports up to 2K (2048×1080) resolution at 60 Hz with a 192 MHz pixel clock, and outputs the video through dual‑link OpenLDI (LVDS) for direct connection to a display panel. It also extracts embedded I²S audio and control signals, making it ideal for infotainment, instrument clusters, and central information displays in vehicles.

2. Which serializers pair with the DS90UB948? Can it work with the DS90UB947 or DS90UB949?
   The DS90UB948 is designed to pair with the DS90UB949 (HDMI‑to‑FPD‑Link III serializer) or the DS90UB941 (MIPI DSI‑to‑FPD‑Link III serializer). It can also interoperate with the DS90UB947 in dual‑link mode when configured for a compatible video format. The serializer sends the video, audio, and control data over a single coaxial cable or shielded twisted‑pair (STP), and the DS90UB948 deserializes it on the display side. Always check the specific serializer’s data sheet for exact mode and link‑rate compatibility.

3. What is the maximum video resolution and pixel clock supported by the DS90UB948?
   It supports pixel clocks up to 192 MHz, which enables 2K resolutions such as 2048×1080 (WUXGA) at 60 Hz, as well as 1920×1080 (Full HD) and 1920×720 at higher refresh rates. The chip uses two FPD‑Link III lanes in dual‑link mode for pixel clocks above 96 MHz, and a single lane for clocks up to 96 MHz. The dual‑link OpenLDI output drives the display panel directly.

4. What is the difference between OpenLDI output and standard LVDS on this device?
   The DS90UB948 outputs OpenLDI, which is a subset of LVDS (FPD‑Link) specifically designed for flat‑panel display interfaces. It provides dual 4‑channel LVDS data lanes (24‑bit RGB plus sync), transmitting 56 bits per clock cycle per link. OpenLDI is directly compatible with most automotive TFT panels. The device can be configured for single‑link (2‑channel) or dual‑link (4‑channel) operation to match the display’s input format.

5. How is audio transmitted through the DS90UB948? What audio formats are supported?
   Audio is embedded in the FPD‑Link III serial stream by the serializer and extracted by the DS90UB948. The device supports up to 8 channels of I²S audio at sample rates up to 192 kHz, with word lengths of 16‑24 bits. It also carries GPIO, I²C, and SPI control signals over the same cable. The audio output appears on dedicated I²S pins, ready to connect to an audio codec or DSP.

6. What are the power supply requirements and typical power consumption of the DS90UB948?
   The device operates from a single 1.8 V core supply and a 1.8 V or 3.3 V I/O supply, depending on the LVDS panel requirements. Typical power consumption is around 700 mW when driving a dual‑link OpenLDI panel at 192 MHz pixel clock. The 64‑pin WQFN package includes an exposed thermal pad that must be soldered to a large copper area for proper heat dissipation.

7. What automotive qualifications does the DS90UB948TNKDRQ1 hold?
   It is a Q1‑grade device, meaning it meets AEC‑Q100 automotive reliability standards. The chip operates over the full ‑40 °C to +105 °C ambient temperature range, making it suitable for harsh automotive interior environments. It also includes built‑in self‑test (BIST), CRC error detection, and advanced diagnostics for functional safety applications up to ASIL‑B.

8. What are the key PCB layout considerations for the DS90UB948?
   The FPD‑Link III inputs require controlled‑impedance differential pairs (typically 100 Ω for STP or 50 Ω for coaxial). Place the AC‑coupling capacitors close to the receiver inputs. The OpenLDI outputs should be routed as length‑matched LVDS pairs to the panel connector. Ensure a solid ground plane, keep the thermal pad well‑grounded, and follow the layout guidelines in the data sheet to meet EMI and signal‑integrity requirements.

9. What is the difference between the DS90UB948 and the DS90UB940 or DS90UB928?
   The DS90UB948 is a 2K‑capable dual‑link LVDS deserializer, while the DS90UB940 is optimized for MIPI DSI displays, and the DS90UB928 is an earlier FPD‑Link III deserializer with lower resolution support. The DS90UB948 stands out with its 192 MHz pixel clock, dual‑link OpenLDI output, integrated audio extraction, and wide operating temperature range, making it the go‑to choice for high‑resolution automotive displays.

10. What are the most typical applications for the DS90UB948TNKDRQ1 in an automotive system?
    It is used in high‑resolution center information displays (CID), reconfigurable instrument clusters, head‑up displays (HUD), passenger entertainment screens, and ADAS surround‑view monitors. The ability to send video, audio, and control over a single lightweight cable while driving a dual‑link LVDS panel directly makes it a compact, reliable solution for modern vehicle cockpit architectures.