參數(shù)資料
型號(hào): MAX9598CTL+
廠商: Maxim Integrated Products
文件頁數(shù): 17/36頁
文件大?。?/td> 0K
描述: IC SWITCH DUAL SCART 40TQFN
產(chǎn)品培訓(xùn)模塊: Lead (SnPb) Finish for COTS
Obsolescence Mitigation Program
標(biāo)準(zhǔn)包裝: 50
功能: 開關(guān)
電路: 2 x SCART
導(dǎo)通狀態(tài)電阻: 7 歐姆
電壓電源: 單/雙電源
電壓 - 電源,單路/雙路(±): 3 V ~ 3.6 V,±11.4 V ~ 12.6 V
工作溫度: 0°C ~ 70°C
安裝類型: 表面貼裝
封裝/外殼: 40-WFQFN 裸露焊盤
供應(yīng)商設(shè)備封裝: 40-TQFN-EP(6x6)
包裝: 管件
Interfacing to an RF Modulator
If the set-top box modulates CVBS and mono audio onto
an RF carrier (for example, channel 3), then a simple
application circuit can provide the needed signals (see
Figure 16). A 10k
Ω resistor summer circuit between
TV_OUTR and TV_OUTL creates the mono audio signal.
The resistor-divider to ground on TV_Y/CVBS_OUT cre-
ates a video signal with normal amplitude. The unique
feature of the MAX9598 that facilitates this application
circuit is that the audio and video output amplifiers of
the MAX9598 can drive multiple loads if VAUD and VVID
are both greater than 3.135V.
Floating-Chassis Discharge
Protection and ESD
Some set-top boxes have a floating chassis problem in
which the chassis is not connected to earth ground. As a
result, the chassis can charge up to 500V. When a
SCART cable is connected to the SCART connector, the
charged chassis can discharge through a signal pin.
The equivalent circuit is a 2200pF capacitor charged to
MAX9598
Low-Power Audio/Video Switch for
Dual SCART Connectors
24
______________________________________________________________________________________
VCR
SCART
TV
SCART
AV = 2V/V
TV_R/C_OUT
AV = 2V/V
VCR_R/C_OUT
VCR_R/C_IN
BIAS
ENC_R/C_IN
BIAS
ENC_C_IN
BIAS
LPF
OFF
MAX9598
75
Ω
75
Ω
0.1
μF
Figure 15. VCR_R/C_IN Receives a Chroma Signal from the VCR SCART Connector. Notice that the Pulldown Switch on
VCR_R/C_OUT Is Closed and that the Gain-of-2 Amplifier is Off. The Chroma Signal from VCR SCART IS Looped Through to the TV
SCART in the Above Configuration.
TV
SCART
MAX9598
TV_OUTR
TV_OUTL
10k
Ω
10k
Ω
MONO AUDIO
TV_Y/CVBS_OUT
75
Ω OR GREATER
75
Ω OR GREATER
75
Ω
RF
MODULATOR
Figure 16. Application Circuit to Connect CVBS and Mono Audio from TV SCART to RF Modulator
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