MAX1202EVKIT [MAXIM]
Fully Assembled and Tested;
| 型号： | MAX1202EVKIT |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | Fully Assembled and Tested |
| 文件： | 总7页 (文件大小：214K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
19-1197; Rev 0; 3/97
MAX1 2 0 2 Eva lu a t io n Kit
Evluates:/MAX1203
_______________Ge n e ra l De s c rip t io n
____________________________Fe a t u re s
♦ Proven PC Board Layout
The MAX1202 evaluation system (EV system) is a com-
plete, 8-channel data-acquisition system consisting of a
MAX1202 e va lua tion kit (EV kit) a nd a Ma xim 3V
68L11D microcontroller (µC) module.
♦ Complete Evaluation System
♦ Convenient On-Board Test Points
♦ Data-Logging Software
The MAX1202 is a low-power, +5V, 8-channel, 12-bit
analog-to-digital converter (ADC) that connects directly
to 3V and 5V microprocessors (µPs). Windows 3.1™/
Windows 95™ software provides a handy user interface
to exercise the MAX1202’s features.
♦ 3V/5V Logic Interface
♦ Fully Assembled and Tested
Order the EV system for comprehensive evaluation of
the MAX1202 using a personal computer. Order the EV
kit if you have already purchased the 68L11D µC mod-
ule with a previous Maxim EV system, or for custom use
in other µC-based systems.
______________Ord e rin g In fo rm a t io n
PART
TEMP. RANGE
0°C to +70°C
0°C to +70°C
BOARD TYPE
Through-Hole
Through-Hole
MAX1202EVKIT-DIP
MAX1202EVL11-DIP
The MAX1202 EV kit and EV system can also be used
to evaluate the MAX1203. Simply order a free sample of
the MAX1203BCPP along with the MAX1202 EV kit. For
3V-only applications, refer to the MAX147 data sheet.
MAX1 2 0 2 EVL1 1
___________S ys t e m Co m p o n e n t Lis t
____________________Co m p o n e n t Lis t
DESIGNATION QTY
DESCRIPTION
PART
QTY
DESCRIPTION
MAX1202 Evaluation Kit
68L11D µC Module
C1–C8, C13
9
0.01µF ceramic capacitors
MAX1202EVKIT-DIP
68L11DMODULE
1
1
C9, C10, C11,
C14, C15
5
0.1µF ceramic capacitors
C12
J1
1
1
2
1
0
8
1
1
1
1
1
1
4.7µF, 10V tantalum capacitor
2 x 20 right-angle socket
3-pin jumper blocks
2-pin jumper block
Open
JU1, JU2
JU3
_____MAX1 2 0 2 S t a n d -Alo n e EV Kit
The MAX1202 EV kit provides a proven PC board lay-
out to facilitate evaluation of the MAX1202. It must be
inte rfa c e d to a p p rop ria te timing s ig na ls for p rop e r
operation. Refer to the MAX1202 data sheet for timing
requirements.
JU4
R1–R8
TP1
300Ω, 5% resistors
8-pin header
Maxim MAX1202BCPP
20-pin socket
U1
Cut JU4 and apply the +5V analog supply between the
+ 5V p a d a nd the p a d ma rke d GND. Conne c t the
VLOGIC pad to the microprocessor's power supply. Set
U2
U3
Maxim ICL7660CPA
78L05 voltage regulator
PC board
JU1 to the 2-3 position (V = -5V) to allow input sig-
SS
nals between ±4V (Table 1).
None
Software disk,
“MAX1202 EVALUATION KIT”
None
1
Windows is a registered trademark of Microsoft Corporation.
________________________________________________________________ Maxim Integrated Products
1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800
MAX1 2 0 2 Eva lu a t io n Kit
______________MAX1 2 0 2 EV S ys t e m
Table 1. Jumper Functions
The MAX1202 EV s ys te m op e ra te s from a us e r-
s up p lie d 9V to 15V DC p owe r s up p ly. The Ma xim
68L11D 3V µC board uses a MAX667 linear regulator to
generate the 3V logic supply. The MAX1202 board
uses a 78L05 linear regulator to generate its own 5V
a na log s up p ly. No le ve l tra ns la tors a re ne c e s s a ry
because the MAX1202 VL pin is connected to the 3V
logic supply.
∫
JUMPER
STATE
1-2
FUNCTION
tied to GND
V
SS
JU1
2-3
V
SS
tied to -5V
Open
1-2
V
SS
must be supplied by the user.
SHDN tied to GND; power-down
SHDN tied to +5V; internal com-
pensation
2-3
Qu ic k S t a rt
1) Install the MAX1202 EV kit software on your comput-
er by running the INSTALL.EXE program on the flop-
py disk. The Windows 3.1 Program Manager (or the
Windows 95 Start Menu) copies the program files
and creates icons for them.
JU2
SHDN floating; external compen-
sation
Open
Closed
Open
REFADJ = +5V; VREF must be
supplied by the user.
2) Check the jumper settings on the EV board. Refer to
Tables 1 and 2.
JU3
JU4
REFADJ = open; VREF = 4.096V
internal reference (MAX1202)
3) Carefully connect the boards by aligning the EV kit’s
40-pin header with the µC module’s 40-pin connec-
tor. Gently press them together. The two boards
should be flush against one another.
Current-sense jumper. The
MAX1202 draws its +5V analog
supply through this trace.
Closed
(default trace)
4) Connect a 9V to 15V DC power source to the µC
module at the terminal block located next to the
on/off switch, in the upper-right corner of the µC
module. Observe the polarity marked on the board.
Open
Do not operate kit with JU4 open.
Table 2. Default Jumper Settings
5) Connect a cable from the computer’s serial port to
the µC module. If using a 9-pin serial port, use a
straight-through, 9-pin female-to-male cable. If the
only available serial port uses a 25-pin connector, a
standard 25-pin to 9-pin adapter is required. The EV
kit software checks the modem status lines (CTS,
DSR, DCD) to confirm that the correct port has been
selected.
DEFAULT
JUMPER
FUNCTION
tied to -5V
STATE
Evluates:/MAX1203
JU1
JU2
2-3
V
SS
2-3
SHDN tied to +5V
REFADJ = open; VREF = 4.096V
internal reference (MAX1202)
JU3
JU4
Open
The MAX1202 draws its +5V
analog supply through this trace.
Closed
6) Start the MAX1202 program by opening its icon in
the Program Manager (or Start Menu).
7) The program will prompt you to connect the µC
module and turn its power on. Slide SW1 to the on
position. Select the correct serial port and click OK.
The program automatically downloads KIT1202.L11
to the module.
Eva lu a t in g t h e MAX1 2 0 3
To evaluate the MAX1203, turn off the power to the EV kit,
c los e J U3, a nd re p la c e U1 with a MAX1203BCPP.
Connect the external voltage reference to the VREF
pad. No other hardware changes are necessary. Refer
to the section Changing the Reference Voltage.
8) Apply input signals to the CH0–CH7 inputs at the
right edge of the MAX1202 EV board. Observe the
readout on the screen.
2
_______________________________________________________________________________________
MAX1 2 0 2 Eva lu a t io n Kit
Evluates:/MAX1203
subsequent line of the log file contains all enabled
channels, separated by commas, tabs, or spaces. The
program continues to write data to the log file until the
“Done” command is selected from the “Log” menu.
__De t a ile d De s c rip t io n o f S o ft w a re
S h u t d o w n P o w e r Cyc lin g
The MAX1202 can be shut down between conversions
to reduce average supply-current demand. From the
“Power” menu, select full power-down (FULLPD) or fast
p owe r-d own (FASTPD) mod e . In fa s t p owe r-d own
mod e , the b a nd g a p re fe re nc e re ma ins a c tive . The
amount of power saved depends primarily on how long
the part is off between conversions. The conversion
accuracy depends on the power-up delay, the refer-
ence capacitor, and the time in power-down. Adjust off-
time with the “De la y Be twe e n Sa mp le s” c omma nd .
Adjust on-time with the “Power-Up Delay” command.
Hig h -S p e e d Da t a S a m p lin g
The high-speed sampling commands can be used for
sampling rates over 10 samples/sec. Data can be col-
lected from any single channel at high speed, using the
commands on the “Sample” menu. First select the num-
ber of samples. Then set the sampling rate either by
inserting a delay between samples, or by choosing one
of the preset sample rates. Use the “Collect” command
to begin collecting data. After the samples are collect-
ed, the data is automatically uploaded to the host and
graphed. Additionally, the data can be saved to a file.
Using an adequate power-up delay ensures conversion
accuracy during power-cycling modes. The reference
must be allowed enough time to stabilize before the
me a s ure me nt is p e rforme d . The “Powe r-Up De la y”
command controls power-up delay. Increase the delay
until accuracy is constant. The power-up delay require-
ment depends on the off-time (delay between samples)
and the value of the reference capacitor (C12).
Ch a n g in g t h e Re fe re n c e Vo lt a g e
The MAX1202 EV kit software assumes a 4.096V refer-
ence voltage, unless otherwise specified. The refer-
ence-voltage assumption can be changed using “Set
Reference Voltage” under the “Device” menu.
If an external reference is used, it must have a tempera-
ture coefficient of 20ppm/°C or less to achieve accuracy
to within four LSBs over the 0°C to +70°C range. For 12-
bit accuracy over this range, the reference must have a
temperature coefficient of 4ppm/°C or less.
The MAX1202 EV kit software performs power-up by
starting a conversion in FASTPD mode and discarding
the reading. FASTPD mode turns on the reference, but
leaves the MAX1202’s other circuitry powered down.
An accurate reference-voltage measurement can be
performed after the power-up delay is complete.
De t a ile d De s c rip t io n
________________________o f Ha rd w a re
The MAX1203 re q uire s a n e xte rna l re fe re nc e , s o
FULLPD mode can always be used, assuming the exter-
nal reference is always stable when measurements are
performed. In this case, set power-up delay to 0.
Co m p o n e n t s
The MAX1202 (U1) is an 8-channel, 12-bit, low-power
analog-to-digital converter (ADC) with serial interface
a nd shutdown. R1–R8 a nd C1–C8 a re a nti-a lia sing
input filters. The analog supply rails are VDD, VSS, and
GND. The digital interface is powered by the VL pin.
The SHDN jumper controls hardware shutdown and
selects internal/external-compensation mode. Refer to
the MAX1202 data sheet for more information.
Me a s u rin g S u p p ly Cu rre n t
On the EV board, the MAX1202 draws all of its +5V
a na log p owe r throug h jump e r J U4, whic h is wire d
closed when the board is shipped from the factory. To
measure the MAX1202’s supply current, modify the
board (with the power off) by cutting jumper JU4 and
connecting a current meter across JU4.
The ICL7660 (U2) is a charge pump that converts +5V
to -5V for V
.
SS
Lo w -S p e e d Da t a Lo g g in g
The RS-232 serial link limits the data-logging sample
rate to no more than 10 samples/sec. The “Log” menu
can be used to write data to a user-specified file in
c omma -s p a c e d -va lue te xt forma t. From the “Log ”
menu, choose “Select Channels”, and select the chan-
nels you want to log. Then choose the “New Log File”
command from the “Log” menu. Once a log file has
been opened, it can be paused or resumed with the
“Pause” command. One complete line of data is written
after all enabled channels have been sampled. The first
line of the log file contains the column headings. Each
The 78L05 (U3) is a +5V linear regulator that provides a
clean analog supply for the MAX1202.
In p u t Filt e rin g
The MAX1202 EV kit has an RC filter on each input with
a time constant (τ) of approximately 3µs (R = 300Ω,
C = 0.01µF). The MAX1202’s acquisition time with a
2MHz clock is 1.5µs. The RC filter’s settling time can
increase the acquisition time required for full accuracy
when switching input channels.
_______________________________________________________________________________________
3
MAX1 2 0 2 Eva lu a t io n Kit
U3
78L05
+9V TO
+15V
+5V
1
3
J1-5
J1-6
R1
300Ω
OUT
IN
JU4
1
20
19
18
17
COM
2
CH0
CH1
CH2
CH3
CH0
CH1
CH2
CH3
V
DD
C1
0.01µF
C15
0.1µF
R2
300Ω
2
3
4
SCLK
CS
J1-37
J1-31
J1-36
J1-29
U1
C2
0.01µF
R3
300Ω
MAX1202
C3
0.01µF
R4
300Ω
DIN
C4
0.01µF
R5
300Ω
5
6
7
8
16
15
14
13
CH4
SSTRB
CH4
CH5
CH6
CH7
C5
0.01µF
R6
300Ω
CH5
CH6
DOUT
VL
J1-35
J1-7
J1-8
C6
0.01µF
R7
300Ω
VLOGIC
GND
C7
0.01µF
C14
0.1µF
R8
300Ω
J1-1
J1-2
J1-3
J1-4
CH7
GND
REFADJ
REF
C8
0.01µF
JU3
Evluates:/MAX1203
+5V
9
12
11
V
VSS
REFADJ
VREF
SS
C13
0.01µF
SHDN
2
10
1
3
C11
0.1µF
SHDN
+5V
C12
JU1
4.7µF
10V
8
+5V
V+
2
1
1
7
TEST POINTS
3
N.C.
LV
OSC
VOUT
CAP+
U2
JU2
5
2
6
3
-5V
ICL7660
C9
0.1µF
GND
CAP-
4
C10
0.1µF
Figure 1. MAX1202 EV Kit Schematic
4
_______________________________________________________________________________________
MAX1 2 0 2 Eva lu a t io n Kit
Evluates:/MAX1203
1.0"
Figure 2. MAX1202 EV Kit Component Placement Guide—
Top Silkscreen
1.0"
1.0"
Figure 3. MAX1202 EV Kit PC Board Layout—Component Side
Figure 4. MAX1202 EV Kit PC Board Layout—Solder Side
_______________________________________________________________________________________
5
MAX1 2 0 2 Eva lu a t io n Kit
Evluates:/MAX1203
Listing 1. MAX1202 Pseudo-Code Example
6
_______________________________________________________________________________________
MAX1 2 0 2 Eva lu a t io n Kit
Evluates:/MAX1203
Listing 2. Bit-Banging Substitute for SPI Port
_______________________________________________________________________________________
7
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