ASX340 datasheet(51/78 Pages) ETC2

51 / 78 page

PDF: 171981479/Source: 8304342517

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ASX340/MT9V139_DS Rev. C Pub. 3/11 EN

ASX340/MT9V139: 1/4-Inch Color CMOS NTSC/PAL Digital Image Sensor

Modes and Timing

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Preliminary

Modes and Timing

This section provides an overview of the typical usage modes and related timing infor-

mation for theASX340/MT9V139.

Composite Video Output

The external pin DOUT_LSB0 can be used to configure the device for default NTSC or PAL

operation (auto-config mode). This and other video configuration settings are available

as register settings accessible through the serial interface.

NTSC

Both differential and single-ended connections of the full NTSC format are supported.

The differential connection that uses two output lines is used for low noise or long

distance applications. The single-ended connection is used for PCB tracks and screened

cable where noise is not a concern. The NTSC format has three black lines at the bottom

of each image for padding (which most LCDs do not display).

PAL

The PAL format is supported with 576 active image rows.

Single-Ended and Differential Composite Output

The composite output can be operated in a single-ended or differential mode by simply

changing the external resistor configuration. For single-ended termination, see

Figure 33 on page 51. The differential schematic is shown in Figure 34 on page 52.

Figure 33:

Single-Ended Termination

VDD

75Ω

Chip

Boundary

i = IPLUS

i = IMINUS

Single-Ended

Single-ended

e.g. PCB Track

e.g. 75Ω COAX

Single-ended

L = 1uH

C = 330

C 1

C = 330

Typical Values for LC

Ω Terminated Receiver

L = 2.2

μH

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