MAX3532EVKIT [MAXIM]
10µ.A.Low-Dropout.Precision Voltage Reference[MAX872/MAX874/MAX872/MAX874/MAX872/MAX874/MAX872C/D/MAX872CPA/MAX872CSA/MAX872CSA-T/MAX872EPA/MAX872ESA/MAX872ESA-T/MAX874C/D/MAX874CPA/MAX874CSA/MAX874CSA-T/MAX874EPA/MAX874ESA/MAX874ESA-T ] ; 10 ＃ 181.A.Low ， Dropout.Precision电压Reference[MAX872/MAX874/MAX872/MAX874/MAX872/MAX874/MAX872C/D/MAX872CPA/MAX872CSA/MAX872CSA-T/MAX872EPA/MAX872ESA/MAX872ESA-T/MAX874C/D/MAX874CPA/MAX874CSA/MAX874CSA-T/MAX874EPA/MAX874ESA/MAX874ESA-T ]\n
| 型号： | MAX3532EVKIT |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | 10µ.A.Low-Dropout.Precision Voltage Reference[MAX872/MAX874/MAX872/MAX874/MAX872/MAX874/MAX872C/D/MAX872CPA/MAX872CSA/MAX872CSA-T/MAX872EPA/MAX872ESA/MAX872ESA-T/MAX874C/D/MAX874CPA/MAX874CSA/MAX874CSA-T/MAX874EPA/MAX874ESA/MAX874ESA-T ]
|
| 文件： | 总8页 (文件大小：95K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
19-1331; Rev 1; 6/98
MAX3 5 3 2 Eva lu a t io n Kit
Evluates:MAX532
Ge n e ra l De s c rip t io n
Fe a t u re s
♦ Single +5V Operation
The MAX3532 evaluation kit (EV kit) simplifies evalua-
tion of the MAX3532 CATV upstream driver amplifier. It
includes a serial data interface, which can be pro-
gra mme d via the pa ra lle l port of a sta nd a rd PC. A
QuickBasic™ program is included to facilitate this func-
tion. This software allows the user to program both the
gain and transmit modes via a simple user interface.
♦ Output Level Range from < 8dBmV to 62dBmV
♦ Gain Programmable in 1dB Steps via Software
♦ 350mW Typical Power Dissipation
♦ Transmit-Disable Mode
Ac c e s s to the d e vic e inp ut a nd outp ut is p rovid e d
through 50Ω SMA connectors. The input is matched to
50Ω, while the output circuit contains a series 24Ω
resistor that increases the load on the output trans-
former to 75Ω when using 50Ω test equipment at the
output.
♦ Two Shutdown Modes
♦ Control Software Included
♦ Fully Assembled and Tested Surface-Mount
Board
Ord e rin g In fo rm a t io n
Co m p o n e n t Lis t
DESIGNATION QTY
DESCRIPTION
PART
TEMP. RANGE
IC PACKAGE
C1–C3, C6
C4, C7
4
2
0.1µF, 25V min, 10% ceramic capacitors
0.001µF, 25V min, 10% ceramic capacitors
MAX3532EVKIT
-40°C to +85°C
36 SSOP
Co m p o n e n t S u p p lie rs
10µF ±10%, 10V min tantalum capacitor
AVX TAJB106K010
C5
R1
1
1
SUPPLIER
AVX
PHONE
FAX
51Ω, 5% resistor
803-946-0690
847-639-6400
718-834-4500
714-373-7939
803-626-3123
847-639-1469
718-832-4961
714-373-7183
R2, R6–R13,
R16–R20
Coilcraft
14 Not installed.
Mini-Circuits
Panasonic
R3, R4
R5
2
1
2
2
8.2Ω 1% resistors
24Ω 5% resistor
Note: Please indicate that your are using the MAX3532 when
contacting these suppliers.
R14, R15
J1, J4
100kΩ 5% resistors
SMA connectors (edge mount)
_________________________Qu ic k S t a rt
The MAX3532 EV kit is fully assembled and factory
tested. Follow the instructions in the Connections and
Setup section.
1.2µH inductors
Coilcraft 1008LS-122XKBC
L1–L4
T1
4
1
4-to-1 transformer (2:1 voltage ratio)
Mini-Circuits T4-1–2W
Note: The output circuit contains a series 24Ω resistor that is
used to bring the load impedance up to 75Ω. This must be
accounted for in all measurements (see Detailed Description).
JU5–JU8
JU1–JU3
J5
4
3
1
7
3-pin headers (0.1” centers)
2-pin headers (0.1” centers)
Female, right-angle DB25 connector
Shunt
Te s t Eq u ip m e n t Re q u ire d
None
•
•
•
•
•
DC supply capable of delivering 5.5V and 200mA of
continuous current.
Surface-mount bead core
Panasonic EXC-CL3216U
B1
1
HP or equivalent signal source capable of generat-
ing 40dBmV up to 200MHz.
+5V, GND
U1
2
1
1
1
1
Test points
HP8561E or e q uiva le nt s p e c trum a na lyze r with
approximately 200MHz frequency range.
MAX3532EAX
None
MAX3532 data sheet
MAX3532 circuit board
MAX3532 software disk
Digital multimeter (DMM) to monitor VCC and ICC, if
desired.
None
None
Lowpass filters to control harmonic output of signal
sources, if harmonic measurements are desired.
QuickBasic is a trademark of Microsoft Corp.
†Protected under U.S. Patent 5,748,027
________________________________________________________________ Maxim Integrated Products
1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.
For small orders, phone 408-737-7600 ext. 3468.
MAX3 5 3 2 Eva lu a t io n Kit
•
Network analyzer such as HP8753D. (May be used
to measure gain and harmonic levels if configured
with this option; contact manufacturer.)
•
•
Place the device in software shutdown
Input a new gain state
Test the software by typing the number “6” (then press
Enter) to place the device in software-shutdown mode.
The current being drawn by the device should drop to
approximately 2mA. If this happens, the software is
functioning. If this does not happen, check the appro-
priate connections; in particular, ensure that jumpers
JU1, JU2, and JU3 are shunted.
•
•
IBM PC or compatible.
Male-to-male 25-pin parallel cable, straight through.
Co n n e c t io n s a n d S e t u p
1) Connect the +5V power supply to +5V and GND on
the circuit board. Connect a 50Ω signal source to
VIN and terminate VOUT with a spectrum analyzer or
network analyzer having a 50Ω input impedance. If
us ing a s ig na l s ourc e with a s ourc e imp e d a nc e
other than 50Ω, or if a different input impedance is
required, be sure to replace resistor R1 with the
appropriate value.
MAX532
Ga in Ad ju s t m e n t
Va lid g a in s ta te s ra ng e from 0 to 63. The nomina l
change in gain is 1dB per gain state. The actual gain
range of the MAX3532 is limited at high power levels by
device saturation and is limited at low power levels by
leakage through the device. This leakage is frequency
d e p e nd e nt. Se e the MAX3532 d a ta s he e t for more
detailed information.
2) Connect a 25-pin male-to-male cable between the
parallel (printer) port of the PC and the 25-pin female
connector on the EV kit board. Ensure that shunts
are placed on jumpers JU1, JU2, and JU3. These
shunts connect the appropriate pins of the DB25
c onne c tor to the s e ria l d a ta inte rfa c e of the
MAX3532. Also check that pins 1 and 2 of jumpers
JU5 and JU6 are shunted. Additionally, ensure that
pins 2 and 3 of JU7 and JU8 are shunted.
S h u t d o w n a n d Tra n s m it En a b le
Jumpers JU5 and JU6 determine how the shutdown
and transmit-enable features are controlled. Pin 2 of
each of these jumpers is connected directly to the
device. If an external source (such as a modulator chip
or microprocessor) is used to control these features,
simply make the connection to pin 2 of the appropriate
jumper. Otherwise, pins 1 and 2 of JU5 and JU6 must
be shunted.
Note: Pin 1 of all jumpers is defined as the closest pin to
the designator.
3) Turn on the power supply. Turn on the PC and the
test equipment. Set the signal source for 36dBmV.
On-b oa rd c ontrol of SHDN (s hutd own) a nd TXEN
(transmit enable) is accomplished manually via jumpers
JU7 and JU8. JU7 and JU8 are used to place either
+5V or GND at TXEN or SHDN. Pin 1 of these jumpers
is GND and pin 3 is +5V.
4) From the DOS prompt of the PC, enable QuickBasic
by typing “qbasic”. Open the file “MAX3532.bas”
from the appropriate directory. Run the program.
_______________De t a ile d De s c rip t io n
Ma n u a l Co n t ro l o f
S e ria l Da t a In t e rfa c e
If using another source to drive the serial data interface
of the MAX3532 EV kit (such as a digital pattern gener-
ator or microprocessor), remove the shunts on jumpers
JU1, JU2, and JU3. Access to the serial data interface
is available through pin 1 of these jumpers.
Us in g t h e S o ft w a re
Whe n the s oftwa re is firs t e na b le d , it p la c e s the
MAX3532 in low-noise mode with a gain state of 58—
approximately 10dB of gain. At this point the device will
draw approximately 75mA. The software allows the
user to do the following:
•
•
Increment the gain state by 1 (add 1dB of gain)
Ou t p u t Circ u it
The MAX3532 uses a differential emitter-follower output
to s up p re s s s e c ond -ord e r d is tortion. In ord e r to
achieve a single-ended output and to attain higher out-
put voltages, a 1:2 (voltage ratio) transformer is used.
Furthermore, the output impedance of the MAX3532
itself is less than 2Ω. In order to match this output to
75Ω, a pair of 8.2Ω back-termination resistors is used.
Decrement the gain state by 1 (decrease the gain
by 1dB)
•
•
•
Enable high-power mode
Enable low-noise mode
Place the device in transmit disable mode
2
_______________________________________________________________________________________
MAX3 5 3 2 Eva lu a t io n Kit
Evluates:
The output circuit is designed for a good match to 75Ω,
with the quality of the match largely determined by the
value of the back-termination resistors. In general, in a
75Ω system the large-signal performance of the device
will improve as these resistor values are reduced; how-
ever, the output match will suffer. If a load impedance
other than 75Ω is to be used, the value of R3 and R4
can be approximated by the following equation:
(20MHz tone) is within 5dB to 15dB of the reference
level. If the fundamental is less than 5dB below the refer-
ence level, the harmonic distortion of the spectrum ana-
lyzer will prevent accurate measurement of the distortion.
To set the gain state, type the number “7” and press the
Enter key on the PC. You will be prompted to enter the
gain state. Type “30” and press Enter. Place the device
in low-noise mode by typing “4” and pressing Enter.
R = (R
/ 8) - 1
LOAD
Measure the level of the fundamental, second, and
third harmonics on the spectrum analyzer. These read-
ings have units of dBm. To convert from dBm to dBmV
in a 50Ω system, use the following equation:
Since most test equipment is supplied with a 50Ω termi-
nation impedance, a series 24Ω resistor is provided
with this EV kit to increase the load impedance to a
nominal 75Ω. This places the proper load on the device
but will also reduce the measured output voltage level
by 3.5dB. It is important to consider this when making
a ny me a s ure me nts with the EV kit. 3.5d B mus t b e
added to all measurements of voltage gain and output
voltage level (including noise) to arrive at the correct
value for a 75Ω system.
MAX532
dBmV = dBm + 47dB (50Ω system)
Add 3.5dB to the converted value to arrive at the cor-
rect output voltage, in dBmV, for a 75Ω load. The gain
can now be calculated in dB, and the harmonic distor-
tion can be calculated in dBc.
Now place the device in high-power mode. Type “3” on
the PC and press the Enter key. This will increase the
gain by approximately 16dB. The steps taken above
can be repeated to solve for gain and harmonic distor-
tion in high-power mode.
If 75Ω test equipment is available, take the following
steps:
1) Remove the 50Ω output SMA connector and replace
it with a 75Ω connector.
La yo u t Co n s id e ra t io n s
The MAX3532 evaluation board can serve as a guide
for your board layout. Particular attention has been paid
to the output circuit prior to the transformer and the DC
supply trace to pins 29 and 30. The traces leading from
output pins 33 and 34 must be as short as possible and
absolutely symmetrical to reject second harmonics.
Additionally, keep the back-termination resistors as
close to the device as possible to minimize the effects
of inductance on the device’s low output impedance.
Sinc e the d e vic e c a n d ra w c los e to 100mA whe n
swinging the maximum signal, the supply trace to pins
29 and 30 must be as wide as practical to minimize
resistive loss.
2) Remove R5 (the 24Ω series output resistor) and
replace it with a 0Ω resistor or some other type of
short.
3) Be sure to use a 75Ω cable on the output.
An a lys is
The following is an example of a simple harmonic dis-
tortion measurement. A filter will be needed to reject
the harmonics generated by the signal source. For this
example, a lowpass filter with approximately a 25MHz
to 35MHz cutoff frequency will be required. This filter
will a ls o ne e d to re je c t a t le a s t 20d B of s ig na l a t
40MHz. Set the signal source for 20MHz and 36dBmV.
Adjust the amplitude to account for the insertion loss in
the filter. Verify with the spectrum analyzer that the sec-
ond and third harmonics generated by the source are
suppressed by at least 70dB. Place the filter between
the input of the EV kit and the signal source, making
sure that the proper terminations are being used for this
particular filter.
Ground inductance and supply decoupling loop induc-
ta nc e d e g ra d e d is tortion p e rforma nc e . The re fore ,
ground plane connections to V (pin 26) and V
(pin
EE
EE2
31) s hould b e ma d e with multip le via s if p os s ib le .
Returning supply decoupling capacitors for pins 29
a nd 30 d ire c tly to p ins 26 a nd 31, re s p e c tive ly, is
re c omme nd e d . Othe rwis e , us e multip le via s to the
ground plane.
Connect a spectrum analyzer to VOUT. Set the center
frequency for 40MHz and the span for 50MHz or more.
Ad jus t the re fe re nc e le ve l s o tha t the fund a me nta l
_______________________________________________________________________________________
3
MAX3 5 3 2 Eva lu a t io n Kit
MAX532
1
AM5X32
Figure 1. MAX3532 EV Kit Schematic
4
_______________________________________________________________________________________
MAX3 5 3 2 Eva lu a t io n Kit
Evluates:
MAX532
1.0"
1.0"
Figure 2. MAX3532 EV Kit Component Placement Guide—
Component Side
Figure 3. MAX3532 EV Kit Component Placement Guide—
Solder Side
_______________________________________________________________________________________
5
MAX3 5 3 2 Eva lu a t io n Kit
MAX532
1.0"
1.0"
Figure 4. MAX3532 EV Kit PC Board Layout—Component Side
Figure 5. MAX3532 EV Kit PC Board Layout—Ground Plane
6
_______________________________________________________________________________________
MAX3 5 3 2 Eva lu a t io n Kit
Evluates:
MAX532
1.0"
1.0"
Figure 6. MAX3532 EV Kit PC Board Layout—Power Plane
Figure 7. MAX3532 EV Kit PC Board Layout—Solder Side
_______________________________________________________________________________________
7
MAX3 5 3 2 Eva lu a t io n Kit
NOTES
MAX532
Evluates:
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.
8
_____________________Ma x im In t e g ra t e d P ro d u c t s , 1 2 0 S a n Ga b rie l Drive , S u n n yva le , CA 9 4 0 8 6 4 0 8 -7 3 7 -7 6 0 0
© 1998 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.
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