MAX9670CTL+T Maxim Integrated Products, MAX9670CTL+T Datasheet

IC AUDIO/VIDEO SWIT DUAL 40TQFN

MAX9670CTL+T

Manufacturer Part Number
MAX9670CTL+T
Description
IC AUDIO/VIDEO SWIT DUAL 40TQFN
Manufacturer
Maxim Integrated Products
Datasheet
1.MAX9670CTL.pdf (44 pages)

Specifications of MAX9670CTL+T

Function
Audio/Video Switch
Circuit
2 x SCART
Voltage Supply Source
Single Supply
Voltage - Supply, Single/dual (±)
3.3 V ~ 12 V
Operating Temperature
0°C ~ 70°C
Mounting Type
Surface Mount
Package / Case
40-WFQFN Exposed Pad
For Use With
MAX9670EVKIT+ - EVALUATION KIT FOR MAX9670
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
The MAX9670/MAX9671 dual SCART matrices route
audio and video signals between a set-top box
decoder chip and two external SCART connectors
under I
12V supply, the MAX9670/MAX9671 consume 66mW
during quiescent operation and 300mW during average
operation when driving typical signals into typical
loads. Video input detection, video load detection, and
a 2.8mW standby mode facilitate the design of intelli-
gent, low-power set-top boxes.
The MAX9670/MAX9671 audio section contains a
buffered crosspoint to route audio inputs to audio out-
puts and programmable volume control from -62dB to
0dB in 2dB steps. The DirectDrive
create a 2V
ground, eliminating the need for bulky output capaci-
tors and reducing click-and-pop noise. The zero-cross
detection circuitry also further reduces clicks and pops
by enabling audio sources to switch only during a zero-
crossing. The MAX9671 offers TV left and right audio
inputs.
The MAX9670/MAX9671 video section contains a
buffered crosspoint to route video inputs to video out-
puts. The standard-definition video signals from the set-
top box decoder chip are lowpass filtered to remove
out-of-band artifacts.
The MAX9670/MAX9671 also support slow-switching
and fast-switching signals. An interrupt signal from the
MAX9670/MAX9671 informs the microcontroller when
the system status has changed.
19-4653; Rev 2; 12/10
Typical Application Circuit appears at end of data sheet.
DirectDrive is a registered trademark of Maxim Integrated
Products, Inc.
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
Set-Top Boxes
TVs
DVD Players
2
C control. Operating from a 3.3V supply and a
Volume Control for Dual SCART Connectors
RMS
Low-Power Audio/Video Switch with Audio
full-scale audio signal biased around
________________________________________________________________ Maxim Integrated Products
General Description
Applications
®
output amplifiers
o 66mW Quiescent Power Consumption
o 2.8mW Standby Mode Consumption
o Programmable Audio Gain Control of -62dB to
o Clickless, Popless, DirectDrive Audio
o Video Input and Video Load Detection
o Video Reconstruction Filter with 10MHz Passband
o 3.3V and 12V Supply Voltages
+ Denotes a lead(Pb)-free/RoHS-compliant package.
* EP = Exposed pad.
MAX9671CTH+
MAX9670CTL+
0dB (TV Audio Outputs)
and 52dB Attenuation at 27MHz
STB CHIP
PART
ENCODER
STEREO
VIDEO
AUDIO
DAC
µC
SINGLE-ENDED R/L
RGB, Y/C, CVBS
STEREO AUDIO
INTERRUPT
OUTPUT
I
2
C
TEMP RANGE
0°C to +70°C
0°C to +70°C
System Block Diagram
12V
Ordering Information
V
EP
MAX9670/MAX9671
12
AUDIO CROSSPOINT
VIDEO FILTERS AND
WITH DIRECTDRIVE
OUTPUTS, VOLUME
SLOW SWITCHING
FAST SWITCHING
REGISTERS AND
I
CHARGE PUMP
2
CROSSPOINT
C INTERFACE
CONTROL
MONITOR
ACTIVITY
3.3V
V
VID
GNDVID
3.3V
PIN-
PACKAGE
40 TQFN-EP*
44 TQFN-EP*
V
AUD
(MAX9671 ONLY)
(MAX9670 ONLY)
SLOW SWITCHING
SLOW SWITCHING
FAST SWITCHING
FAST SWITCHING
RGB, Y/C, CVBS
RGB, Y/C, CVBS
L/R AUDIO
L/R AUDIO
Y/C, CVBS
L/R AUDIO
CVBS
Features
INPUTS
TV R+L
AUDIO
SCART
SCART
Yes
No
VCR
TV
1

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MAX9670CTL+T Summary of contents

Page 1

... DVD Players Typical Application Circuit appears at end of data sheet. DirectDrive is a registered trademark of Maxim Integrated Products, Inc. ________________________________________________________________ Maxim Integrated Products For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. o 66mW Quiescent Power Consumption o 2 ...

Page 2

Low-Power Audio/Video Switch with Audio Volume Control for Dual SCART Connectors ABSOLUTE MAXIMUM RATINGS V to GNDVID........................................................-0.3V to +4V VID V to EP.................................................................-0.3V to +14V ...............................................................-0.3V to +4V AUD EP to GNDVID .......................................................-0.1V to +0.1V All ...

Page 3

Low-Power Audio/Video Switch with Audio Volume Control for Dual SCART Connectors ELECTRICAL CHARACTERISTICS (continued 12V 3.3V VID AUD GNDVID T = +25°C.) (Note 2) A PARAMETER SYMBOL AC-COUPLED INPUT Sync-Tip Clamp Level ...

Page 4

Low-Power Audio/Video Switch with Audio Volume Control for Dual SCART Connectors ELECTRICAL CHARACTERISTICS (continued 12V 3.3V VID AUD GNDVID T = +25°C.) (Note 2) A PARAMETER SYMBOL AC CHARACTERISTICS Filter Passband Flatness ...

Page 5

Low-Power Audio/Video Switch with Audio Volume Control for Dual SCART Connectors ELECTRICAL CHARACTERISTICS (continued 12V 3.3V VID AUD GNDVID T = +25°C.) (Note 2) A PARAMETER SYMBOL Input Resistance Input Bias Current ...

Page 6

Low-Power Audio/Video Switch with Audio Volume Control for Dual SCART Connectors ELECTRICAL CHARACTERISTICS (continued 12V 3.3V VID AUD GNDVID T = +25°C.) (Note 2) A PARAMETER SYMBOL Input Current Output Low Voltage ...

Page 7

Low-Power Audio/Video Switch with Audio Volume Control for Dual SCART Connectors ELECTRICAL CHARACTERISTICS (continued 12V 3.3V VID AUD GNDVID T = +25°C.) (Note 2) A PARAMETER SYMBOL OTHER DIGITAL I/O DEV_ADDR Low ...

Page 8

Low-Power Audio/Video Switch with Audio Volume Control for Dual SCART Connectors ( 3.3V 12V, V VID AUD 12 GNDVID otherwise noted.) LARGE-SIGNAL GAIN FLATNESS vs. FREQUENCY FILTER ...

Page 9

Low-Power Audio/Video Switch with Audio Volume Control for Dual SCART Connectors ( 3.3V 12V, V VID AUD 12 GNDVID otherwise noted FILTER 80ns/div 12.5T NO FILTER 1µs/div NTC7 NO FILTER 10µs/div _______________________________________________________________________________________ Typical ...

Page 10

Low-Power Audio/Video Switch with Audio Volume Control for Dual SCART Connectors ( 3.3V 12V, V VID AUD 12 GNDVID otherwise noted.) VIDEO INPUT SYNC-TIP CLAMP VOLTAGE vs. TEMPERATURE ...

Page 11

Low-Power Audio/Video Switch with Audio Volume Control for Dual SCART Connectors ( 3.3V 12V, V VID AUD 12 GNDVID otherwise noted.) AUDIO CROSSTALK vs. FREQUENCY 0 -20 -40 -60 -80 -100 -120 10 100 1k ...

Page 12

Low-Power Audio/Video Switch with Audio Volume Control for Dual SCART Connectors PIN NAME MAX9670 MAX9671 1 1 SDA 2 2 SCL 3 3 DEV_ADDR INT AUD 6 6 C1P 7 7 C1N 8 8 CPVSS ...

Page 13

Low-Power Audio/Video Switch with Audio Volume Control for Dual SCART Connectors PIN NAME MAX9670 MAX9671 28 31 GNDVID 29 32 VCR_R/C_IN VID 31 34 ENC_C_IN 32 35 ENC_R/C_IN 33 36 TV_R/C_OUT 34 37 VCR_R/C_OUT 35 38 VCR_Y/CVBS_OUT ...

Page 14

Low-Power Audio/Video Switch with Audio Volume Control for Dual SCART Connectors ENC_INL (0.5V VCR_INL *TV_INL ENC_INR VCR_INR *TV_INR SCL SDA DEV_ADDR V AUD C1P EP C1N CPVSS Figure 1. MAX9670/MAX9671 Audio Section Functional Diagram The MAX9670 audio circuit is essentially ...

Page 15

Low-Power Audio/Video Switch with Audio Volume Control for Dual SCART Connectors GND CONVENTIONAL DRIVER-BIASING SCHEME + OUT GND -V DD DirectDrive BIASING SCHEME Figure 2. Conventional Driver Output Waveform vs. MAX9670/ MAX9671 Output ...

Page 16

Low-Power Audio/Video Switch with Audio Volume Control for Dual SCART Connectors TV_Y/CVBS_IN CLAMP VCR_Y/CVBS_IN CLAMP ENC_Y/CVBS_IN CLAMP ENC_Y_IN CLAMP VCR_R/C_IN CLAMP/BIAS ENC_R/C_IN CLAMP/BIAS ENC_C_IN CLAMP/BIAS VCR_G_IN CLAMP ENC_G_IN CLAMP VCR_B_IN CLAMP ENC_B_IN CLAMP VCRIN_FS 0. Figure ...

Page 17

Low-Power Audio/Video Switch with Audio Volume Control for Dual SCART Connectors Whether the incoming video signal is AC-coupled or DC-coupled into the MAX9670/MAX9671 depends upon the origin, format, and voltage range of the video signal. Table 1 below shows the ...

Page 18

Low-Power Audio/Video Switch with Audio Volume Control for Dual SCART Connectors video sources that are sent to the VCR SCART connec- tor are controlled by bits the VCR Video Input Control register (08h). See Tables 10, ...

Page 19

Low-Power Audio/Video Switch with Audio Volume Control for Dual SCART Connectors SDA t SU, DAT t LOW SCL t HIGH t HD, STA t R START CONDITION 2 Figure Serial-Interface Timing Diagram REPEATED START condition, an acknowledge ...

Page 20

Low-Power Audio/Video Switch with Audio Volume Control for Dual SCART Connectors The acknowledge bit (ACK clocked 9th bit that the MAX9670/MAX9671 use to handshake receipt of each byte of data when in write mode (see Figure 8). The ...

Page 21

Low-Power Audio/Video Switch with Audio Volume Control for Dual SCART Connectors ACKNOWLEDGE FROM MAX9670/MAX9671 S SLAVE ADDRESS 0 A R/W Figure 11. Reading One Indexed Byte of Data from the MAX9670/MAX9671 ACKNOWLEDGE FROM MAX9670/MAX9671 S SLAVE ADDRESS 0 A REGISTER ...

Page 22

Low-Power Audio/Video Switch with Audio Volume Control for Dual SCART Connectors STEREO AUDIO DACS 1µF 6.65kΩ ENC_INL R1* 1µF 6.65kΩ ENC_INR R1* *R1 VALUES DAC = CS4334/5/8/ 4.53kΩ, 1% DAC = PCM1742 5.57kΩ, 1% Figure 13. ...

Page 23

Low-Power Audio/Video Switch with Audio Volume Control for Dual SCART Connectors TV_SS ACTIVE VCR_SS NOT ACTIVE TV_SS NOT ACTIVE VCR_SS ACTIVE TV-TO-VCR AUDIO VCR VIDEO VCR SLOW SWITCH VCR FAST SWITCH: NOT APPLICABLE TV_SS ...

Page 24

Low-Power Audio/Video Switch with Audio Volume Control for Dual SCART Connectors 0.1µF VCR_R/C_IN BIAS ENC_R/C_IN BIAS ENC_C_IN BIAS MAX9670/MAX9671 Figure 15. Gain-of-2 amplifier on VCR_R/C_OUT outputs chroma signal to VCR SCART connector. Notice that the pulldown switch on VCR_R/C_OUT is ...

Page 25

Low-Power Audio/Video Switch with Audio Volume Control for Dual SCART Connectors MAX9670/MAX9671 TV_Y/CVBS_OUT Figure 17. Application Circuit to Connect CVBS and Mono Audio from TV SCART to RF Modulator Interfacing Modulator If the set-top box modulates CVBS ...

Page 26

Low-Power Audio/Video Switch with Audio Volume Control for Dual SCART Connectors STB CHIP MICRO- CONTROLLER VIDEO ENCODER STEREO AUDIO DACS 1µF 1µF *R1 VALUES DAC = CS4334/5/8/ 4.53kΩ ±1% DAC = PCM1742 5.57kΩ ±1% Figure 18. ...

Page 27

Low-Power Audio/Video Switch with Audio Volume Control for Dual SCART Connectors MAX9670/MAX9671 0.1µF ENC_R/C_IN 0.1µF ENC_G_IN 3.3V 0.1µF SET-TOP BOX ENC_B_IN CHIP INPUTS SET TO SYNC-TIP CLAMP DAC 3.3V DAC 3.3V DAC YIN PBIN PRIN SHDN (A) Figure 19. Triple ...

Page 28

Low-Power Audio/Video Switch with Audio Volume Control for Dual SCART Connectors Table 1. Recommended Coupling for Incoming Video Signals and Input Circuit Configuration* VIDEO ORIGIN FORMAT External CVBS External RGB External Y External C Internal CVBS Internal RGB Internal Y/C ...

Page 29

Low-Power Audio/Video Switch with Audio Volume Control for Dual SCART Connectors Table 3. Slave Address DEV_ADDR GNDVID VID SCL SDA Table 4. I ...

Page 30

Low-Power Audio/Video Switch with Audio Volume Control for Dual SCART Connectors Table 7. Quiescent Power Consumption POWER CONSUMPTION OPERATING MODE Shutdown Standby mode with no video activity (i.e., TV slow-switch and VCR slow-switch inputs are at ground). Standby mode is ...

Page 31

Low-Power Audio/Video Switch with Audio Volume Control for Dual SCART Connectors Table 9. Conditions for Average Power Consumption Measurement (continued) PIN (MAX9670) NAME 31 ENC_C_IN 32 ENC_R/C_IN 33 TV_R/C_OUT 34 VCR_R/C_OUT 35 VCR_Y/CVBS_OUT 36 TV_Y/CVBS_OUT 37 VCR_Y/CVBS_IN 38 TV_Y/CVBS_IN 39 ...

Page 32

Low-Power Audio/Video Switch with Audio Volume Control for Dual SCART Connectors Table 11. Data Format for Read Mode REGISTER BIT 7 ADDRESS (hex) Power-on 0Eh Not used 0Fh Not used Table 12. Register 00h: Audio Control DESCRIPTION 7 TV Audio ...

Page 33

Low-Power Audio/Video Switch with Audio Volume Control for Dual SCART Connectors Table 14. Register 06h: TV Video Input Control DESCRIPTION Input Sources for TV Video Input Sources for TV_G_OUT and TV_B_OUT Table 15. Register 07h: TV Video Output Control DESCRIPTION ...

Page 34

Low-Power Audio/Video Switch with Audio Volume Control for Dual SCART Connectors Table 16. Register 08h: ENC and VCR Video Input/Output Control DESCRIPTION Input Sources for VCR Video ENC_R/C_IN Clamp/Bias ENC R/C, G, and B inputs high-impedance bias (in HD application) ...

Page 35

Low-Power Audio/Video Switch with Audio Volume Control for Dual SCART Connectors Table 17. Register 09h: VCR Video Output Control DESCRIPTION Set VCR Slow Switching VCR_R/C_OUT Ground Table 18. Register 0Dh: Output Enable DESCRIPTION TVOUT_FS Enable TV_Y/CVBS_OUT Enable TV_B_OUT Enable TV_G_OUT ...

Page 36

Low-Power Audio/Video Switch with Audio Volume Control for Dual SCART Connectors Table 19. Register 10h: Operating Modes DESCRIPTION Operating Mode Table 20. Register 0Eh: Status DESCRIPTION TV Slow-Switching Input Status VCR Slow-Switching Input Status Power-On Reset 36 ______________________________________________________________________________________ BIT 7 ...

Page 37

Low-Power Audio/Video Switch with Audio Volume Control for Dual SCART Connectors Table 21. Register 0Fh: Video Activity Status DESCRIPTION TV CVBS Input Video Detection TV CVBS Output Load VCR CVBS Input Video Detection VCR CVBS Output Load ENC_Y/CVBS_IN Input Video ...

Page 38

Low-Power Audio/Video Switch with Audio Volume Control for Dual SCART Connectors STB CHIP MICRO- CONTROLLER VIDEO ENCODER STEREO 1µF AUDIO DACS 1µF *R1 VALUES DAC = CS4334/5/8/ 4.53kΩ ±1% DAC = PCM1742 5.57kΩ ±1% 38 ______________________________________________________________________________________ ...

Page 39

Low-Power Audio/Video Switch with Audio Volume Control for Dual SCART Connectors TOP VIEW ENC_C_IN 32 ENC_R/C_IN 33 TV_R/C_OUT VCR_R/C_OUT 34 35 VCR _Y/CVBS_OUT MAX9670 36 TV_Y/CVBS_OUT VCR_Y/CVBS_IN 37 38 TV_Y/CVBS_IN ...

Page 40

Low-Power Audio/Video Switch with Audio Volume Control for Dual SCART Connectors For the latest package outline information and land patterns www.maxim-ic.com/packages. Note that a “+”, “#”, or “-” in the package code indicates RoHS status only. Package drawings ...

Page 41

Low-Power Audio/Video Switch with Audio Volume Control for Dual SCART Connectors For the latest package outline information and land patterns www.maxim-ic.com/packages. Note that a “+”, “#”, or “-” in the package code indicates RoHS status only. Package drawings ...

Page 42

Low-Power Audio/Video Switch with Audio Volume Control for Dual SCART Connectors For the latest package outline information and land patterns www.maxim-ic.com/packages. Note that a “+”, “#”, or “-” in the package code indicates RoHS status only. Package drawings ...

Page 43

Low-Power Audio/Video Switch with Audio Volume Control for Dual SCART Connectors For the latest package outline information and land patterns www.maxim-ic.com/packages. Note that a “+”, “#”, or “-” in the package code indicates RoHS status only. Package drawings ...

Page 44

... Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. 44 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2010 Maxim Integrated Products ...

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