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19-1369; Rev 0; 7/98
MAX4188 Evaluation Kit
General Description
The MAX4188 evaluation kit (EV kit) simplifies evalua-
tion of the MAX4188 triple, low-power, current-feedback
amplifier. The MAX4188 amplifier is set to a gain of
+2V/V. SMA connectors and 50Ω terminating resistors
are included for 50Ω test equipment compatibility. For
video test equipment compatibility, simply change the
terminating resistors to 75Ω and change R
F
and R
G
resistors to the values shown in the MAX4188/
MAX4189/MAX4190 data sheet.
The EV kit comes with the MAX4188 installed. To evaluate
the MAX4189, order a free sample (MAX4189ESD),
replace the MAX4188 with the MAX4189 on the EV board,
and change the gain-setting and feedback resistors for
unity gain as shown in the MAX4188/MAX4189/
MAX4190 data sheet.
____________________________Features
o
Fast Enable/Disable Times (120ns/35ns)
o
Very Low Switching Transient (45mVp-p)
o
Single +5V or Dual ±5V Supply Operation
o
130MHz -3dB Bandwidth
o
350V/µs Slew Rate
o
70MHz -0.1dB Gain Flatness
o
0.04%/0.32% Gain/Phase Errors (R
L
= 150Ω)
o
Fully Assembled and Tested Surface-Mount Board
Evaluates: MAX4188/MAX4189
____________________________Component List
DESIGNATION QTY
C1, C4
C2, C5
C3, C6
R1–R6
RF1, RF2, RF3,
RG1, RG2,
RG3
IN1+, IN2+,
IN3+, OUT1,
OUT2, OUT3
JU1, JU2, JU3
U1
None
None
2
2
2
6
6
DESCRIPTION
10µF, 10V, 20% tantalum capacitors
AVX TAJB106M010 or
Sprague 293D106X0010B
0.33µF, 10% ceramic capacitors
0.01µF, 10% ceramic capacitors
49.9Ω, 1% resistors
_______________Ordering Information
PART**
MAX4188EVKIT
TEMP. RANGE
-40°C to +85°C
IC PACKAGE
14 SO
**To
evaluate the MAX4189, request a MAX4189ESD sample.
Quick Start
390Ω, 1% resistors
6
3
1
1
3
SMA connectors
2-pin header
MAX4188ESD
MAX4188 EV kit PC board
Shunts for JU1, JU2, JU3
Component Suppliers
SUPPLIER*
AVX
Sprague
PHONE
(803) 946-0690
(603) 224-1961
FAX
(803) 626-3123
(603) 224-1430
The MAX4188 EV kit is fully assembled and tested.
Follow these steps to verify board operation.
1) The circuit requires supply voltages of ±2.25V to
±5.5V. For evaluation purposes, connect a +5V sup-
ply to the pad labeled VCC and a -5V supply to the
pad labeled VEE. Connect power-supply ground to
the pad labeled GND.
2) Connect an output (OUT1–OUT3) to an oscilloscope
input. Remove shunt from the corresponding jumper
(JU1–JU3) to enable the selected amplifier.
3) Turn on the power supply. Apply a ±1.35V signal to
the appropriate amplifier input (IN1–IN3). The 100Ω
load (chosen for ease of evaluation) limits the output
voltage range. Wider output voltage swings are
achievable with lighter loads. See the MAX4188/
MAX4189/MAX4190 data sheet.
4) Verify the output signal on the oscilloscope.
*Please
indicate that you are using the MAX4188 when contact-
ing these component suppliers.
________________________________________________________________
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.
MAX4188 Evaluation Kit
Evaluates: MAX4188/MAX4189
_______________Detailed Description
Setting the Voltage Gain
The gain of the MAX4188’s amplifiers can be individual-
ly set by changing the appropriate feedback (RF) and
gain-set (RG) resistors. For example, the gain of ampli-
fier 1 can be set using resistors RF1 and RG1. Refer to
the MAX4188/MAX4189 data sheet for recommended
values.
the corresponding jumper shunt. The amplifiers default
to the enable mode if the
DISABLE
pin is left floating/
unconnected. For a single +5V supply or dual ±5V sup-
plies, the
DISABLE
inputs are CMOS-logic compatible.
The logic threshold is V
CC
- 2.5V.
Layout Considerations
The PC board layout has been optimized for high-
speed signals and low distortion, with careful attention
given to grounding, power-supply bypassing, and sig-
nal-path layout. The small, surface-mount, ceramic
bypass capacitors (C2, C3, C5, C6) have been placed
as close to the amplifier’s supply pins as possible.
Capacitance at the inverting input pins has been mini-
mized by reducing the length and width of the input
and feedback traces and by using 0805-size feedback
and gain-set resistors.
Enable/Disable Control
The MAX4188 provides
DISABLE
pins to enable or dis-
able each of the three outputs and isolate the amplifiers
from the external inputs. Jumpers JU1–JU3 can be used
to manually control each DISABLE pin. An external con-
troller may also be used by connecting the controller to
the appropriate disable pad (DISABLE_) and removing
OUT2
DISABLE1
DISABLE2
JU1
JU2
JU3
DISABLE3
1
2
3
2
IN2-
DISABLE2
DISABLE3
IN2+
14
RF2
390Ω
R6
49.9Ω
OUT2
RG2
390Ω
DISABLE1
13
12
IN2+
R5
49.9Ω
MAX4188
VCC
C1
10µF
10V
IN1+
R1
49.9Ω
6
RG1
390Ω
OUT1
R2
49.9Ω
RF1
390Ω
7
OUT1
IN1-
IN3-
9
RF3
390Ω
OUT3
8
R3
49.9Ω
RG3
390Ω
OUT3
C2
0.33µF
4
C3
0.01µF
5
IN1+
IN3+
V
CC
V
EE
11
C6
0.01µF
10
R4
49.9Ω
C5
0.33µF
C4
10µF
10V
IN3+
V
EE
1
3
Figure 1. MAX4188 EV Kit Schematic
2
_______________________________________________________________________________________
MAX4188 Evaluation Kit
Evaluates: MAX4188/MAX4189
1.0"
Figure 2. MAX4188 EV Kit Component Placement Guide—
Component Side
1.0"
Figure 3. MAX4188 EV Kit PC Board Layout—Component Side
_______________________________________________________________________________________
3
MAX4188 Evaluation Kit
Evaluates: MAX4188/MAX4189
1.0"
Figure 4. MAX4188 EV Kit PC Board Layout—Solder Side
1.0"
Figure 5. MAX4188 EV Kit Component Placement Guide—
Solder Side
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.
4
_____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600
© 1998 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products.

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