MAX7456EUI+T Maxim Integrated Products, MAX7456EUI+T Datasheet - Page 10

• Manufacturer Part Number: MAX7456EUI+T
• Description: IC DISPLAY 1CH W/EEPROM 28TSSOP
• Manufacturer: Maxim Integrated Products
• Type: OSD (On-Screen Display) Video Generatorr

Specifications of MAX7456EUI+T

• Applications: Security Systems, Video Routing
• Mounting Type: Surface Mount
• Package / Case: 28-TSSOP Exposed Pad, 28-eTSSOP, 28-HTSSOP
• Current - Supply: 58mA
• Voltage - Supply: 4.75 V ~ 5.25 V
• Operating Temperature: -40°C ~ 85°C
• Interface: SPI Serial
• Display Type: OSD
• Digits Or Characters: 256 Characters
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Configuration: -
• Lead Free Status / Rohs Status: Details

Single-Channel Monochrome On-Screen
Display with Integrated EEPROM
The MAX7456 single-channel monochrome on-screen
display (OSD) generator integrates all the functions need-
ed to generate a user-defined OSD and insert it into the
output signal. The MAX7456 accepts a composite NTSC
or PAL video signal. The device includes an input clamp,
sync separator, video timing generator, OSD insertion
mux, nonvolatile character memory, display memory,
OSD generator, crystal oscillator, an SPI-compatible inter-
face to read/write the OSD data, and a video driver (see
the Simplified Functional Diagram ). Additionally, the
MAX7456 provides vertical sync (VSYNC), horizontal
sync (HSYNC), and loss-of sync (LOS) outputs for system
synchronization. A clock output signal (CLKOUT) allows
daisy-chaining of multiple devices.
See the MAX7456 Register Description section for an
explanation of register notation use in this data sheet.
Figure 2. Typical Operating Circuit
10
______________________________________________________________________________________
CLKOUT
SDOUT
SCLK
SDIN
CS
27MHz
+5V
Detailed Description
0.1μF
10
11
12
13
14
1
2
3
4
5
6
7
8
9
DVDD
N.C.
N.C.
DGND
CLKIN
CS
N.C.
N.C.
XFB
CLKOUT
SDIN
SCLK
SDOUT
LOS
MAX7456
HSYNC
VSYNC
RESET
PVDD
AVDD
VOUT
PGND
AGND
SAG
N.C.
N.C.
N.C.
VIN
N.C.
28
27
26
25
24
23
22
21
20
19
18
17
16
15
The 256 user-defined 12 x 18 pixel character set
comes preloaded and is combined with the input video
stream to generate a CVBS signal with OSD video out-
put. A maximum of 256 12 x 18 pixel characters can be
reprogrammed in the NVM. In NTSC mode, 13 rows x
30 characters are displayed. In PAL mode, 16 rows x
30 characters are displayed. When the input video sig-
nal is absent, the OSD image can still be displayed by
using the MAX7456’s internal video timing generator.
The MAX7456 accepts standard NTSC or PAL CVBS
signals at VIN. The video signal input must be AC-cou-
pled with a 0.1µF capacitor and is internally clamped.
An input coupling capacitance of 0.1µF is required to
guarantee the specified line-time distortion (LTD) and
video clamp settling time. The video clamp settling time
changes proportionally to the input coupling capaci-
tance, and LTD changes inversely proportional to the
capacitance.
0.1μF
0.1μF
+5V
C
1kΩ
SAG
+5V
C
0.1μF
1kΩ
OUT
1kΩ
75Ω
75Ω
HS
VS
CVBS OUT
LOS
CVBS IN
Video Input