Not Recommended for New Designs
This product was manufactured for Maxim by an outside wafer foundry
using a process that is no longer available. It is not recommended for
new designs. The data sheet remains available for existing users.
A Maxim replacement or an industry second-source may be available.
Please see the QuickView data sheet for this part or contact technical
support for assistance.
For further information,
contact Maxim’s Applications Tech Support.
MAX459 Evaluation Kit
_______________General Description
The MAX459 evaluation kit (EV kit) simplifies the evalua-
tion of the MAX458 and MAX459 video crosspoint
switches. The MAX459 is already installed and a sam-
ple MAX458 can be ordered from Maxim. Simply
replace the MAX459 with the MAX458; no other
changes are necessary.
The kit includes an assembled printed circuit board, a
5 1/4" program disk, and a data sheet. This manual pro-
vides easy instructions for using the EV kit. Separate
sections describe driving coaxial cables, controlling
serial/parallel address modes, and daisy chaining mul-
tiple EV kits.
____________________________Features
o
100MHz Bandwidth (MAX458)
90MHz Bandwidth (MAX459)
o
Low Differential Gain/Phase Error
o
75
W
Output Impedance
o
300V/
m
s Slew Rate
o
70ns Channel Switching Time
o
High-Z Amplifier Output Capability
o
16-Bit Serial and 6-Bit Parallel Address Modes
o
PC-Compatible Software for Controlling Serial
and Parallel Address Modes
MAX459 EV Kit
____________________Component List
LABEL
U1
C1, C2
C3, C4
R1–R12
R13, R14
R15, R16, R17
SW1
J1
IN0–IN7,
OUT0–OUT3
QTY
1
2
2
12
2
3
1
1
12
COMPONENT DESCRIPTION
Maxim MAX459CQH
10µF, 10V tantalum capacitors
0.1µF ceramic capacitors
75Ω, 5% resistors
50kΩ, 5% SIP resistors
500Ω, 5% SIP resistors
12-position DIP switch
26-pin male connector
BNC jacks
______________Ordering Information
PART
MAX459EVKIT-PLC
TEMP. RANGE
0°C to +70°C
BOARD TYPE
Surface Mount
Note: To evaluate the MAX458, request a MAX458CQH sample.
_________________________Quick Start
The MAX459 EV kit is fully assembled and tested. To
verify board functionality, follow these quick start
instructions.
Do not turn on the power supply until all
connections are completed.
1) Connect a +5V supply to the pad marked V
CC
.
Connect a -5V supply to the pad marked V
EE
.
Connect power supply ground to the pad marked
GND.
2) Connect the output marked OUT0 to an oscillo-
scope through a terminated 75Ω cable.
3) Set all logic control switches on SW1 to logic low,
––
—
except CS, which should be set to logic high.
4) Turn on the power supply.
5) Apply a signal (±1.25V max) to the BNC jack input
marked IN0.
6) Verify the output signal on the oscilloscope.
7) Refer to the
Controlling Parallel/Serial Modes
sec-
tion for changing address modes.
________________________________________________________________
Maxim Integrated Products
1
Call toll free 1-800-998-8800 for free samples or literature.
MAX459 Evaluation Kit
MAX459 EV Kit
_______________Detailed Description
The MAX458/MAX459 operate on
±5V,
allowing output
signal levels of
±2.5V.
BNC jacks are provided for all input
and output signals. Design architecture ensures that no
two inputs will be shorted together. And, a digitally con-
trolled shutdown mode reduces power consumption.
The parallel address mode can be set manually or
through software. And, multiple EV boards can be
daisy-chained to form larger switch arrays.
Manual Control
Dip switch SW1 provides manual control of the logic
inputs in parallel mode. All logic input lines have 50kΩ
pull-up resistors to +5V.
1) Set all switches on SW1 to logic low, except CS,
UPDATE, and WR, which should be set to logic
high.
2) Select an output amplifier with switches A0 and A1.
To disable an output amplifier, set D3 to logic high.
3) Select an input for the output selected in step 2
with switches D0–D2.
4) Pulse WR low to latch input registers.
5) Pulse UPDATE low to latch the switch registers
and update the outputs.
Refer to text under
Digital Section—Parallel Mode
and
Tables 1–3 of the MAX458/MAX459 data sheet for more
details of operation and truth table. The EV kit will not
respond properly to manual control if the interface
cable (as described below) connects the board to the
parallel port of the PC.
Driving Coaxial Cables
High-speed performance, excellent output current, and
an internally fixed gain of 2V/V make the MAX459 ideal
for driving 50Ω or 75Ω back-terminated coaxial cables.
The EV kit is configured with 75Ω terminating resistors
on all inputs, and 75Ω back-terminating resistors on all
outputs for 75Ω coaxial-cable matching.
Using the MAX459 results in an overall gain of one at
the terminated cable’s output. With the MAX458
installed, the overall gain is reduced to one-half the
input signal when driving a terminated cable.
Layout Considerations
The MAX459 EV kit layout is optimized for high-speed
signals. Each signal trace is kept the same length and
as short as possible to maintain phase relationship and
minimize inductance. Separate AC grounds surround
each signal trace to reduce coupling. Further layout
recommendations can be found in the
Grounding and
Bypassing, PC Board Layout
section of the
MAX458/MAX459 data sheet.
Software Control
Applications software comes with the MAX459 EV kit for
programming serial or parallel address modes.
459EVKIT.BAS is the source code written in Microsoft
QuickBasic. 459EVKIT.EXE is the compiled program that
is executable from the DOS command line. It uses the
computer’s “LPT1” output to interface to the EV board.
Follow the instructions below for serial or parallel digital
control:
1) Set all switches on SW1 high (except SHDN) prior
to starting the computer program.
2) Connect an interface cable from the computer’s
parallel port to the evaluation board.
Recommended cable and connectors are:
26-conductor ribbon cable
D-subminiature 25-pin, male,
crimp-type connector
26-pin IDC crimp-type socket connector
The EV kit board and software are designed for a
“straight-through” cable configuration. Table 1
shows the pin assignments for the cables.
3) Load the disk and type the command 459EVKIT.
4) Select serial or parallel address mode.
Once the user selects a mode, the program displays a
valid list of input commands. The program displays the
current state of the input and switch registers.
Controlling Parallel/Serial Modes
A digital interface for parallel address modes can be
established manually with dip switches or with PC-com-
patible software. Serial-interface control is established
only through serial software (see the
Software Control
section). For details on the operation and for truth
tables, refer to the
Digital Section—Parallel/Serial Mode
sections of the MAX458/MAX459 data sheet.
2
_______________________________________________________________________________________
MAX459 Evaluation Kit
Table 1. Cable Pin Assignments
Parallel Port (LPT1)
Pin
1
2
3
4
5
6
7
8
9
14
16
17
10
11
12
13
15
18–25
Signal
Strobe
Data Bit 0
Data Bit 1
Data Bit 2
Data Bit 3
Data Bit 4
Data Bit 5
Data Bit 6
Data Bit 7
Auto Feed
Init. Prt.
Select
Ack
Busy
Paper End
Select In
Error
Bit 0–7 GND
EV Kit Board (J1)
Pin
1
3
5
7
9
11
13
15
17
2
6
8
19
21
23
25
4
–—
–
WR
D0
D1
D2
D3
A0
A1
DIN
SCLK
– — —–
— ——
UPDATE
––
—
CS
––
—
CE
No Connect
No Connect
No Connect
No Connect
No Connect
Signal
––
—
During parallel mode, the program keeps CS high and
SCLK and DIN low.
Input Codes:
0–7 Sets the selected input channel and output
amplifier (0–3 only).
L
Latches switch registers and updates outputs.
D
Disables specified output amplifier.
E
Exits program.
MAX459 EV Kit
10, 12, 14,
16, 18, 20, GND
22, 24, 26
Parallel Address Mode
There are 4 amplifiers that can be configured individu-
ally as follows:
1) Select a valid amplifier (0–3) and a valid input
(0–7).
—
–
–—
–
With CE low and WR high, the program presents
the input/output information to the chip at A0, A1
–—
–
and D0–D3. The program pulses WR low as each
input is selected, and the data is then latched into
the input registers.
2) To latch the switch registers and update the out-
puts, select — – latch command code L. This puls-
– — the
— ——
es the UPDATE line low.
3) To disable the selected amplifier, select D. The
–—
–
program places D3 high and pulses WR low.
Select L to latch the data.
Serial Address Mode
In serial address mode, amplifiers 0–3 are configured
with 16 bits of data in 4-bit blocks (D3–D0) as follows:
1) Enter four input settings to set up the amplifiers.
2) Update the outputs to the current input settings,
by selecting latch command L. The program then
––
—
pulses CS high. Outputs remain unchanged until
––
—
the rising edge of CS.
3) To disable an output, select D.
Input Codes:
0–7 Sets the selected input channel.
L
Latches switch registers and update outputs.
D
Disables output amplifier.
E
Exits program.
–— – — — –
– — ——
During serial mode, the program keeps WR, UPDATE,
––
—
and CE high.
Daisy-Chain Configuration
Multiple EV boards can be daisy-chained and separat-
ed in serial address mode to form larger switch arrays.
To form a chain:
1) Connect DOUT of the first board to DIN of the sec-
ond board.
––
—
2) Tie CS from each board together and SCLK from
each board together, as shown in Figure 12 of the
MAX458/MAX459 data sheet.
The boards will be programmed in a first-in, first-out
(FIFO) manner. For example, the second board in the
chain will receive its first 4-bit block when the first
board receives its fifth 4-bit block.
_______________________________________________________________________________________
3
MAX459 EV Kit
V
EE
MAX459 Evaluation Kit
Figure 1. MAX459 EV Kit Schematic
C3
0.1µF
C4
0.1µF
35
4
IN0
36
OUT1
R11
75Ω
OUT2
R12
75Ω
OUT3
V
CC
50kΩ
11
IN3
A0
A1
13
IN4
D1
D2
D3
IN5
UPDATE
WR
17
IN6
CS
DIN
19
IN7
22
20
DOUT
SERIAL
INTERFACE
SCLK
43
R14D
1
R14A
44
R14C
CE
40
R14G
41
R14F
42
R14E
23
R13F
25
R13E
26
PARALLEL
INTERFACE
R13D
D0
27
R13C
28
R13B
29
R13A
SHDN
21
R13G
R15A
R15B
R15C
R15D
R15E
7
R17A
9
R16C
2
R16D
1
R16A
R16E
R17B
15
R16B
17
500Ω
21
24
23
22
14
15
16
17
18
19
13
DIP
SWITCH
SW1
5
4
1
2
3
11
10
9
8
7
6
12
8
6
3
5
11
13
J1
R10
75Ω
OUT0
OUT0
V
CC
38
12
V
CC
V
EE
R9
75Ω
14
V
EE
33
C2
10µF
10V
OUT1
7
IN1
4
V
CC
C1
10µF
10V
IN0
R1
75Ω
IN1
R2
75Ω
MAX458/MAX459
OUT2
9
IN2
OUT3
31
34
IN2
R3
75Ω
IN3
R4
75Ω
IN4
R5
75Ω
IN5
15
R6
75Ω
IN6
R7
75Ω
_______________________________________________________________________________________
GND
2
3 5 6 8 10 16 18 20 24 30 32 37 39
IN7
R8
75Ω
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