MAX9670CTL+T (Maxim) PDF资料下载 Datasheet(20/44 页)

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参数资料

型号：	MAX9670CTL+T
厂商：	Maxim Integrated Products
文件页数：	20/44页
文件大小：	0K
描述：	IC AUDIO/VIDEO SWIT DUAL 40TQFN
产品培训模块：	Lead (SnPb) Finish for COTS Obsolescence Mitigation Program
标准包装：	2,500
功能：	音频/视频切换
电路：	2 x SCART
电压电源：	单电源
电压 - 电源，单路/双路(±)：	3.3 V ~ 12 V
工作温度：	0°C ~ 70°C
安装类型：	表面贴装
封装/外壳：	40-WFQFN 裸露焊盘
供应商设备封装：	40-TQFN-EP（6x6）
包装：	带卷 (TR)
配用：	MAX9670EVKIT+-ND - EVALUATION KIT FOR MAX9670

MAX9670/MAX9671

Low-Power Audio/Video Switch with Audio

Volume Control for Dual SCART Connectors

______________________________________________________________________________________

Similarly, when YPbPr signals are desired, ENC_R/C_IN,

ENC_G_IN, and ENC_B_IN of the MAX9670/MAX9671

should be set to high-impedance mode by setting bit 4 in

The high-impedance mode has higher priority whether

ENC_R/C_IN is in sync-tip clamp or bias circuit mode

(set by bit 3 in register 08h). If ENC_R/C_IN, ENC_G_IN,

and ENC_B_IN are DC-coupled, the inputs should be left

in sync-tip clamp mode. The RGB outputs of the

MAX9670/MAX9671 should be muted or shut down.

In either case, the inactive device should not distort the

video signals generated by the DACs.

Power-Supply Bypassing

The MAX9670/MAX9671 feature single 3.3V and 12V

supply operation and require no negative supply. The

12V supply V12 is for the SCART switching function. For

V12, place a 0.1F bypass capacitor as close as possi-

ble. Connect all VAUD pins together to 3.3V and bypass

with a 10F electrolytic capacitor in parallel with a

0.1F ceramic capacitor to audio ground. Bypass each

VVID to video ground with a 0.1F ceramic capacitor.

Using a Digital Supply

The MAX9670/MAX9671 are designed to operate from

noisy digital supplies. The high PSRR (49dB at 100kHz)

allows the MAX9670/MAX9671 to reject the noise from

the digital power supplies (see the

Typical Operating

Characteristics). If the digital power supply is very noisy

and stripes appear on the television screen, increase

the supply bypass capacitance. An additional, smaller

capacitor in parallel with the main bypass capacitor

can reduce digital supply noise because the smaller

capacitor has lower equivalent series resistance (ESR)

and equivalent series inductance (ESL).

Layout and Grounding

For optimal performance, use controlled-impedance

traces for video signal paths and place input termina-

tion resistors and output back-termination resistors

close to the MAX9670/MAX9671. Avoid routing video

traces parallel to high-speed data lines.

The MAX9670/MAX9671 provide separate ground con-

nections for video and audio supplies. For best perfor-

mance, use separate ground planes for each of the

ground returns and connect all ground planes together

at a single point. See the MAX9670/MAX9671 evalua-

tion kit for a proven circuit board layout example.

If the MAX9670/MAX9671 are mounted using flow sol-

dering or wave soldering, the ground via(s) for the EP

pad should have a finished hole size of at least 14mils

to insure adequate wicking of soldering onto the

exposed pad. If the MAX9670/MAX9671 are mounted

using solder mask technique, the via requirement does

not apply. In either case, a good connection between

the exposed pad and ground is required to minimize

noise from coupling onto the outputs.

Figure 19. Triple DAC is connected to both a MAX9670/MAX9671 and a MAX9653/MAX9654 high-definition video-filter amplifier. (A)

The MAX9670/MAX9671 are transmitting standard-definition RGB signals while the MAX9653/MAX9654 are in shutdown mode. (B)

The MAX9670/MAX9671 are not transmitting RGB signals, but the MAX9653/MAX9654 are transmitting high-definition YPbPr signals.

DAC

SET-TOP BOX

CHIP

ENC_R/C_IN

ENC_G_IN

ENC_B_IN

TV_R/C_OUT

TV_G_OUT

TV_B_OUT

MAX9653

MAX9654

SCART

CONNECTOR

OFF

YPbPr OUTPUTS

(A)

YOUT

PBOUT

PROUT

YIN

PBIN

PRIN

SHDN

DAC

3.3V

DAC