DLP391TPFSB datasheet(23/46 Pages) TI2

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6.3 Feature Description

6.3.1 Power Interface

The DMD requires four DC voltages: 1.8V source (for VDD and VDDI), VOFFSET, VRESET, and VBIAS. In a typical

LED-based system, 1.8V, VOFFSET, VRESET, and VBIAS are managed by the DLPA3085 / DLPA3082 PMIC and

LED driver.

6.3.2 LPSDR Low-Speed Interface

The low-speed interface handles instructions that configure the DMD and control reset operation. LS_CLK is the

low-speed clock, and LS_WDATA is the low-speed data input.

6.3.3 High-Speed Interface

The purpose of the high-speed interface is to transfer pixel data rapidly and efficiently, making use of high-speed

DDR transfer and compression techniques to save power and time. The high-speed interface is composed of

differential SubLVDS receivers for inputs, with a dedicated clock.

6.3.4 Timing

The data sheet provides timing at the device pin. For output timing analysis, the tester pin electronics and

their transmission line effects must be considered. Figure 5-14 shows an equivalent test load circuit for the

output under test. Timing reference loads are not intended to be precise representations of any particular system

environment or depiction of the actual load presented by a production test. System designers should use IBIS

or other simulation tools to correlate the timing reference load to a system environment. The load capacitance

value stated is only for the characterization and measurement of AC timing signals. This load capacitance value

does not indicate the maximum load the device is capable of driving.

6.4 Device Functional Modes

DMD functional modes are controlled by the DLPC8445V display controller. See the DLPC8445V display

controller data sheet or contact a TI applications engineer.

6.5 Optical Interface and System Image Quality Considerations

TI assumes no responsibility for end-equipment optical performance. Achieving the desired end-equipment

optical performance involves making trade-offs between numerous component and system design parameters.

Optimizing system optical performance and image quality strongly relate to optical system design parameter

trade-offs. Although it is not possible to anticipate every conceivable application, projector image quality and

optical performance are contingent on compliance with the optical system operating conditions described in the

following sections.

6.5.1 Numerical Aperture and Stray Light Control

The angle defined by the numerical aperture of the illumination and projection optics at the DMD optical area

should be the same. This angle should not exceed the nominal device micromirror tilt angle unless appropriate

apertures are added in the illumination and projection pupils to block out flat-state and stray light from the

projection lens. The micromirror tilt angle defines the DMD's capability to separate the "ON" optical path from

any other light path, including undesirable flat-state specular reflections from the DMD window, DMD border

structures, or other system surfaces near the DMD, such as prism or lens surfaces. If the numerical aperture

exceeds the micromirror tilt angle, or if the projection numerical aperture angle is more than two degrees larger

than the illumination numerical aperture angle (and vice versa), contrast degradation and objectionable artifacts

in the display border and active area could occur.

6.5.2 Pupil Match

TI’s optical and image quality specifications assume that the exit pupil of the illumination optics is nominally

centered within 2° of the entrance pupil of the projection optics. Misalignment of pupils can create objectionable

artifacts in the display border or active area, which may require additional system apertures to control, especially

if the numerical aperture of the system exceeds the pixel tilt angle.

www.ti.com

DLP391TP

DLPS289A – JUNE 2025 – REVISED SEPTEMBER 2025

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