TI's DS90C187 is a low-power parallel-to-serial converter (serializer) that is primarily used in battery-powered handheld devices to reduce the size of the RGB interface between the main GPU and the display. The device supports up to QXGA 2048 x 1536@60Hz resolution and dual pixel data transfer between the host and flat panel display. It consumes 100mW at 185MHz and can drive QXGA/WQXGA displays. It supports 24-bit RGB and 48-bit RGB. It has three modes of operation: single pixel in/one pixel out (SISO), single pixel in/out of pixel out (SIDO). And dual pixel in / double pixel out (DIDO).
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TI's DS90C187 is a low-power parallel-to-serial converter (serializer) that is primarily used in battery-powered handheld devices to reduce the size of the RGB interface between the main GPU and the display.
Figure 1 DS90C187 parallel-to-serial converter block diagram (SISO)
The DS90C187 serializer is designed to support dual pixel data transfer between the host and the flat panel display up to QXGA 2048 x 1536@ 60Hz. The transmitter can convert up to 48-bit (two-pixel 24-bit color) 1.8V LVCMOS data into two channels, each of which is a 4-data+clock (4D+) fold-width interface LVDS-compatible data stream.
The DS90C187 supports three modes of operation. In single-pixel input/output mode, the device can drive up to SXGA+1400×1050@ 60Hz. In this mode, the device converts a bank's 24-bit RGB data into a channel's 4D+ C LVDS data stream.
In single-pixel input/dual-pixel output mode, the device can drive up to WUXGA+1920×1440@60Hz. In this configuration, the device provides single, dual pixel conversion and converts a bank's 24-bit RGB data into a two-channel 4D+ C LVDS data stream (half-pixel clock rate). In dual-pixel input/dual-pixel output mode, the device can drive up to 2048×1536@ 60Hz or QSXGA2560×2048@30Hz of QXGA. In this mode, the device converts 2-channel 24-bit RGB data into a 2-channel 4D+ C LVDS data stream. In all modes, the device supports 18bpp and 24bpp colors.
The DS90C187 is available in a small 92-pin dual-row QFN package with a single 1.8V supply to minimize power consumption.
DS90C187 main features
• Typical power consumption at 100mW at 185MHz (SIDO mode)
• Drive QXGA/WQXGA class display
Figure 2 DS90C187 parallel-to-serial converter block diagram (SIDO)
Figure 3 DS90C187 parallel-to-serial converter block diagram (DIDO)
• Three modes of operation
– single pixel input, output (SISO), maximum 105MHz
– Single pixel input / dual pixel output (SIDO), 185MHz
– Dual pixel input / dual pixel output (DIDO), 105MHz
• Support 24-bit RGB, 48-bit RGB
• Optional low power mode, support for 18-bit RGB, 36-bit RGB
• Support 3D, 4D+, 6D+, 6D+2, 8D+, 8D+2 C LVDS configurations
• Linked to FPD, compatible with FlatLink Deserializer
• 1.8V VDDIO, and nuclear power
• Interface directly connected to 1.8V LVCMOS
• Less than 1mW in sleep mode
• Spread spectrum clock compatible
• Small 7mm × 7mm × 0.9mm, 92 pins
Double row QFN package
DS90C187 application
• Media tablet device
• eBook / Laptop
• Portable display
C187EVK01 evaluation module
Texas Instruments' C187EVK01 Evaluation Module (EVM) helps designers evaluate the performance of the DS90C187 low-power 1.8V dual-pixel FPD-Link (LVDS) serializer. The device operates from a single 1.8V supply and supports pixel clocks from 50MHz to 185MHz (single-in, dual-out) or 25MHz to 105MHz (single/double in/single out) inputs.
Main features of the C187EVK01 evaluation module
• 185MHz, 100 mW typical power consumption (SIDO mode)
• Drive QXGA/WQXGA level display
Figure 4 C187EVK01 evaluation module (EVM) circuit diagram (1)
• Three modes of operation:
– single pixel input, single pixel output (SISO), up to 105MHz
– Single pixel input / dual pixel output (SIDO), 185MHz
– Dual pixel in / dual pixel out (DIDO), 105MHz
• Support 24-bit RGB, 48-bit RGB
• Optional low power mode, support for 18-bit RGB, 36-bit RGB
• Support 3D+, 4D+, 6D+, 6D+2, 8D+, 8D+2 C LVDS configurations
• Compatible with FPD links, FlatLink serializers
• 1.8V VDDIO, and nuclear power supply
• Power consumption in sleep mode is less than 1mW
• Spread spectrum clock compatible
• 7mm × 7mm × 0.9mm, 92-pin dual-row QFN package
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