MAX4358ECE MAXIM [Maxim Integrated Products], MAX4358ECE Datasheet - Page 40

• Manufacturer Part Number: MAX4358ECE
• Description: 32 x 16 Nonblocking Video Crosspoint Switch with On-Screen Display Insertion and I/O Buffers
• Manufacturer: MAXIM [Maxim Integrated Products]

32 x 16 Nonblocking Video Crosspoint Switch
with On-Screen Display Insertion and I/O Buffers
device connecting to DIN of the second device, and so
on (Figure 11). Two distinct programming modes,
Individual Output Address Mode (MODE = 0) and
Complete Matrix Mode (MODE = 1) are selected by
toggling a single MODE control pin high or low. Both
modes operate with the same physical board layout.
This allows initial programming of the IC by daisy-
chaining and sending one long data word while still
being able to immediately address and update individ-
ual locations in the matrix.
In Individual Output Address Mode, the devices are
connected in a serial-bus configuration, with the data
routing gate (Figure 3) connecting DIN to DOUT, mak-
ing each device a virtual node on the serial bus. A sin-
gle 16-bit control word is sent to all devices
simultaneously. Only the device with the corresponding
chip address responds to the programming word and
updates its output. In this mode the chip address is set
via hardware pin strapping of A3–A0. The host commu-
nicates with the device by sending a 16-bit word con-
sisting of 1 don’t care bit, 4-chip address bits, 11 bits of
data to make the word exactly two bytes in length. The
11 data bits are broken down into 4 bits to select the
output to be programmed, 1 bit to set the output
enable, 1 bit to set gain and 5 bits to the select the
40
Figure 11. Typical Single +5V Supply Application
______________________________________________________________________________________
Individual Output Address Mode
IN0
IN1
IN31
AGND
MAX4358
+5V
V
CC
OUT15
OUT0
OUT1
V
EE
(Mode = 0)
1V
P-P
500
U2
500
+5V
2V
P-P
input to be connected to that output. In this method, the
matrix is programmed one output at a time.
I
a daisy-chain fashion where n 5 112 bits are sent to
program the entire matrix, where n = the number of
MAX4358 devices connected in series. The data word
is structured such that the first bit is the LSB of the last
device in the chain and the last data bit is the MSB of
the first device in the chain. The total length of the data
word is equal to the number of crosspoint devices to be
programmed in series times 112 bits per crosspoint
device. This programming method is most often used
at start-up to initially configure the switching matrix.
The MAX4358 guarantees operation with a single +5V
supply and a gain of +1V/V for standard video-input
signals (1Vp-p). To implement a complete video matrix
switching system capable of gain = +2V/V while operat-
ing with a +5V single supply, combine the MAX4358
crosspoint switch with Maxim’s low-cost, high-perfor-
mance video amplifiers optimized for single +5V supply
operation (Figure 11). The MAX4450 single and
MAX4451 dual op amps are unity-gain-stable devices
that combine high-speed performance with Rail-to-
n Complete Matrix Mode, the devices are connected in
75
OR 1/4 MAX4383
U2 = MAX4450
220 F
Operating at +5V Single-Supply with
Z
0
Complete Matrix Mode (Mode = 1)
= 75
75
MONITOR 0
A
V
= +1V/V or +2V/V