General Description
The MAX104/MAX106/MAX108 evaluation kits (EV kits)
are designed to simplify evaluation of the devices' ana-
log-to-digital converters (ADCs). Each EV kit contains
all circuitry necessary to evaluate the dynamic perfor-
mance of these ultra-high-speed converters, including
the power-supply generation for the PECL termination
voltage (PECLV
TT
). Since the design combines high-
speed analog and digital circuitry, the board layout
calls for special precautions and design features.
Connectors for the power supplies (V
CC
A/V
CC
I, V
CC
D,
V
CC
O, V
EE
), SMA connectors for analog and clock
inputs (VIN+, VIN-, CLK+, CLK-), and all digital PECL
outputs simplify connection to the EV kit. The four-layer
board layout (GETekTM material) is optimized for best
dynamic performance of the MAX104 family.
The EV kits come with a MAX104/MAX106/MAX108
installed on the board with a heatsink attached for oper-
ation over the full commercial temperature range.
Features
o
50
Clock and Analog Inputs Through SMA
Coaxial Connectors
o
250mV Input Signal Range
o
Demultiplexed Differential PECL Outputs
o
On-Board Generation of PECL Termination
Voltage (PECLV
TT
)
o
On-Board Generation of ECL Termination Voltage
(ECLV
TT
)
o
Separate Analog and Digital Power and Ground
Connections with Optimized Four-Layer PCB
o
Square-Pin Headers for Easy Connection of Logic
Analyzer to Digital Outputs
o
Fully Assembled and Tested
Evaluate: MAX104/MAX106/MAX108
MAX104/MAX106/MAX108 Evaluation Kits
________________________________________________________________
Maxim Integrated Products
1
19-1503; Rev 0; 6/99
Component List
PART
MAX104
EVKIT
MAX106
EVKIT
0C to +70C
0C to +70C
TEMP.
RANGE
PIN-
PACKAGE
192 ESBGA
192 ESBGA
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.
For small orders, phone 1-800-835-8769.
Ordering Information
Not populated; see text for descrip-
tion of reset input operation.
2
R3, R4
DESIGNATION
10k
potentiometer
1
R2
1N5819 Schottky diode
1
D1
47pF 10% ceramic capacitors
(0402)
20
C3C6, C15, C16,
C22C25,
C33C37,
C42C45, C50
0.01F 10% ceramic capacitors
(0603)
30
C2, C7C12, C14,
C17, C18, C19,
C21, C26C30,
C32, C41, C47,
C49, C51C59
10F 10%, 16V tantalum caps
AVX TAJD106D016
7
C1, C13, C20, C31,
C40, C46, C48
DESCRIPTION
QTY
MAX108
EVKIT*
0C to +70C
192 ESBGA
SAMPLING
RATE
1Gsps
600Msps
1.5Gsps
GETek is trademark of GE Electromaterials.
49.9
1% resistors (0603)
38
R5R38,
R44R47
DESIGNATION
DESCRIPTION
QTY
2-pin headers
41
JU2, JU4, JU5,
JUA0- to JUA7-,
JUA0+ to JUA7+,
JUP0- to JUP7-,
JUP0+ to JUP7+,
JUOR+, JUOR-,
JUDR-, JUDR+,
JURO-, JURO+
3-pin headers
5
JU3, JU6JU9
SMA connectors (edge mounted)
10
J1J10
158
1% resistors (0603)
2
R52, R54
243
1% resistors (0603)
2
R51, R53
*
Future product--contact factory for availability.
_________________________Quick Start
The EV kit is delivered fully assembled, tested, and
sealed in an antistatic bag. To ensure proper operation,
open the antistatic bag only at a static-safe work area
and follow the instructions below.
Do not turn on the
power supplies until all power connections to the
EV kit are established.
Figure 1 shows a typical evalu-
ation setup with differential analog inputs and single-
ended sine-wave (CLK- is 50
reverse-terminated to
GNDI) clock drive. Figure 2 shows a typical evaluation
setup with single-ended analog inputs (VIN- is 50
reverse-terminated to GNDI) and a single-ended sine-
wave clock drive.
1) Connect a -5V power supply capable of providing
-250mA to the pad marked V
EE
. Connect the sup-
ply's ground to the GNDI pad.
Set the current limit
to 500mA or less.
2) Connect a +5V power supply capable of providing
600mA to the V
CC
I pad. Connect the supply's
ground to the GNDI pad.
3) Connect a +5V power supply capable of providing
250mA to the V
CC
D pad. Connect the supply's
ground to the GNDD pad.
4) Connect a +3.3V or +5V power supply capable of
providing approximately 600mA to the V
CC
O pad.
Connect the supply's ground to the GNDD pad.
5) Connect GNDI to GNDD at the power supplies.
6) Connect an RF source with low phase jitter, such as
an HP8662A (up to 1.28GHz) or an HP8663A (up to
2.56GHz), to clock inputs CLK- and CLK+. For sin-
gle-ended clock inputs, feed a +4dBm (500mV
amplitude) power level from the signal generator
into the CLK+ input and terminate the unused CLK-
input with 50
to GNDI.
7) Connect a 225mV (approximately -1dB below FS)
sine-wave test signal to the analog inputs. Use
VIN+ and VIN- through a balun if the test signal is
differential, or either VIN+ or VIN- if the signal is sin-
gle-ended (see the sections
Single-Ended Analog
Inputs and Differential Analog Inputs in the devices'
data sheets). For best results, use a narrow band-
pass filter designed for the frequency of interest to
reduce the harmonic distortion from the signal gen-
erator.
8) Connect a logic analyzer, such as an HP16500C
with an HP16517A plug-in card for monitoring all 16
output channels (8 channels for primary and 8
channels for auxiliary outputs) of the device.
9) Connect the logic analyzer clock to the DREADY+
output on the EV kit, and set the logic analyzer to
trigger on the falling edge of the acquisition clock.
Set the logic analyzer's threshold voltage to the
V
CC
O supply voltage -1.3V. For example, if V
CC
O =
+3.3V, the threshold voltage should be set to
+2.0V.
10) Turn on the supplies and signal sources. Capture
the digitized outputs from the ADC with the logic
analyzer and transfer the digital record to a PC for
data analysis.
Evaluate: MAX104/MAX106/MAX108
MAX104/MAX106/MAX108 Evaluation Kits
2
_______________________________________________________________________________________
Component List (continued)
Shunts
7
None
Test points
24
V
CC
O, V
CC
D,
GNDD, PECLV
TT
,
GNDA, V
CC
A,
V
CC
I, GNDI, V
EE
,
ECLV
TT
Protective feet
4
None
Heatsink
International Electronic Research
Corp. BDN09-3CB/A01
1
None
MAX104CHC, MAX106CHC, or
MAX108CHC (192-contact ESBGATM)
1
U1
LM2991S, low-dropout adjustable
linear regulator
2
U3, U4
MAX104EVKIT circuit board
1
None
MAX104, MAX106, or MAX108 data
sheet
1
None
DESIGNATION
DESCRIPTION
QTY
ESBGA is a trademark of Amkor/Anam.
Evaluate: MAX104/MAX106/MAX108
MAX104/MAX106/MAX108 Evaluation Kits
_______________________________________________________________________________________
3
MAX104
MAX106
MAX108
EV KIT
BALUN
HP8662/3A
SINE-WAVE SOURCE
PHASE
LOCKED
f
SAMPLE
, + 4dBm
EXTERNAL 50
TERMINATION TO GNDI
HP8662/3A
SINE-WAVE SOURCE
POWER
SUPPLIES
GNDD
+5V ANALOG
VIN+
VIN-
CLK+
CLK-
16 DATA
DREADY+
-5V ANALOG
+5V DIGITAL
+3.3V DIGITAL
GNDI
HP16500C
DATA ANALYSIS
SYSTEM
GPIB
PC
BPF
Figure 1. Typical Evaluation Setup with Differential Analog Inputs and Single-Ended Clock Drive
MAX104
MAX106
MAX108
EV KIT
HP8662/3A
SINE-WAVE SOURCE
PHASE
LOCKED
f
SAMPLE
, + 4dBm
EXTERNAL 50
TERMINATION TO GNDI
EXTERNAL 50
TERMINATION
TO GNDI
HP8662/3A
SINE-WAVE SOURCE
POWER
SUPPLIES
GNDD
+5V ANALOG
VIN+
VIN-
CLK+
CLK-
16 DATA
DREADY+
-5V ANALOG
+5V DIGITAL
+3.3V DIGITAL
GNDI
HP16500C
DATA ANALYSIS
SYSTEM
GPIB
PC
BPF
Figure 2. Typical Evaluation Setup with Single-Ended Analog Inputs and Single-Ended Clock Drive
Evaluate: MAX104/MAX106/MAX108
MAX104/MAX106/MAX108 Evaluation Kits
4
_______________________________________________________________________________________
_______________Detailed Description
Clock Input Requirements
The MAX104/MAX106/MAX108 feature clock inputs
designed for either single-ended or differential opera-
tion with very flexible input drive requirements. Each
clock input is terminated with an on-chip, laser-trimmed
50
resistor to CLKCOM (clock termination return). The
traces from the SMA inputs to the high-speed data con-
verter are 50
microstrip transmission lines.
The CLKCOM termination voltage may be connected
anywhere between ground and -2V for compatibility
with standard ECL drive levels. The side-launched SMA
connectors for the clock signals are located at the
lower left corner of the EV board and are labeled J3
(CLK+) and J4 (CLK-).
An on-board bias generator, located between the ana-
log and clock inputs, creates a -2V termination voltage
(ECLV
TT
) for operation with ECL clock sources. The
voltage is generated by an LM2991 voltage regulator
operated from the board's -5V V
EE
power supply. To
enable this ECLV
TT
bias generator, first remove short-
ing jumper JU2, then move jumper JU3 into its ON
position.
The voltage regulator has a shutdown control that
requires a TTL logic-high level to enter the shutdown
state. This logic level is derived from the +5V analog
supply (V
CC
I). The EV kits are delivered with the
ECLV
TT
bias generator turned off and CLKCOM tied to
GNDI (JU2 installed).
NOTE: If the regulator's shutdown logic level is not
present (V
CC
I on first) before the V
EE
supply is
turned on, the regulator will momentarily turn on
until the V
CC
I supply is energized. If JU2 is installed,
this will momentarily short the regulator's output to
ground. The regulator is short-circuit protected so
no damage will result. The regulator is further pro-
tected by limiting the V
EE
supply current to 500mA.
Single-Ended Clock Inputs
(Sine-Wave Drive)
To obtain the lowest jitter clock drive, AC- or DC-couple
a low-phase-noise sine-wave source into a single clock
input. Clock amplitudes of up to 1V (2Vp-p or +10dBm)
can be accommodated with CLKCOM connected to
GNDI.
The dynamic performance of the data converter is
essentially unaffected by clock-drive power levels from
-10dBm to +10dBm (100mV to 1V clock signal ampli-
tude). The dynamic performance specifications are
measured with a single-ended clock drive of +4dBm
(500mV clock signal amplitude). To avoid saturation of
the input amplifier stage, limit the clock power level to a
maximum of +10dBm.
Differential Clock Inputs (ECL Drive)
The MAX104/MAX106/MAX108 clock inputs may also
be driven with standard ground-referenced ECL logic
levels by using the on-board ECLV
TT
-2V bias genera-
tor as described above. It is also possible to drive the
clock inputs with positive supply referenced (PECL)
levels if the clock inputs are AC-coupled. With AC-cou-
pled clock inputs, the CLKCOM termination voltage
should be grounded. Single-ended DC-coupled ECL
drive is possible as well, if the undriven clock input is
tied to the ECL V
BB
voltage (-1.3V nominal).
Analog Input Requirements
The analog inputs to the ADC on the EV board are pro-
vided by two side-launch SMA connectors located on
the middle left side of the EV kit. They are labeled J1
(VIN+) and J2 (VIN-). The analog inputs are terminated
on-chip with precision laser-trimmed 50
NiCr resistors
to GNDI. Although the analog (and clock) inputs are
ESD protected, good ESD practices should always be
observed. The traces from the SMA inputs to the device
are 50
microstrip transmission lines. The analog
inputs can be driven either single-ended or differential.
Optimal performance is obtained with differential input
drive due to reduction of even-order harmonic distor-
tion. Table 1 represents single-ended input drive, and
Table 2 displays differential input drive.
Table 1. Input Setup and Output Code Results for Single-Ended Analog Inputs
0V
+250mV - 1LSB
0V
+250mV
VIN+
VIN-
0
1
OVERRANGE BIT
11111111
11111111 (full scale)
OUTPUT CODE
0
0V
-250mV + 1LSB
0
00000001
01111111
toggles 10000000
0V
0V
0
0V
-250mV
00000000 (zero scale)
Evaluate: MAX104/MAX106/MAX108
MAX104/MAX106/MAX108 Evaluation Kits
_______________________________________________________________________________________
5
Internal Reference
The MAX104 family features an on-chip +2.5V precision
bandgap reference, which can be used by shorting
jumper JU5 to connect REFOUT with REFIN. If
required, REFOUT can also source up to 2.5mA to sup-
ply other peripheral circuitry.
To use an external reference, remove the shorting
jumper on JU5 and connect the new reference voltage
source to the REFIN side of JU5. Leave the REFOUT
side of JU5 floating. Connect the ground of the external
reference to GNDI on the EV kit. REFIN accepts an
input voltage range of +2.3V to +2.7V.
CAUTION: With an external reference connected,
JU5 must not be installed at any time to avoid dam-
aging the internal reference with the external refer-
ence supply.
Offset Adjust
The devices also provide a control input (VOSADJ) to
eliminate any offset from additional preamplifiers dri-
ving the ADC. The VOSADJ control input is a self-
biased voltage divider from the internal +2.5V precision
reference. Under normal-use conditions, the control
input is left floating.
The EV kits include a 10k
potentiometer that is biased
from the ADC's +2.5V reference. The wiper of the
potentiometer connects to the VOSADJ control input
through JU4. To enable the offset-adjust function, install
a shorting jumper on JU4 and adjust potentiometer R2
while observing the resulting offset in the reconstructed
digital outputs. The offset-adjust potentiometer offers
about 5.5LSB of adjustment range. The EV kits are
shipped from the factory without a shorting jumper
installed on JU4.
Primary and Auxiliary
PECL Outputs
All PECL outputs on the EV kits are powered from the
V
CC
O power supply, which may be operated from any
voltage between +3.0V to +5.0V for flexible interfacing
with either +3.3V or +5V systems. The nominal V
CC
O
supply voltage is +3.3V.
The PECL outputs are standard open-emitter types and
require external 50
termination resistors to the
PECLV
TT
voltage for proper biasing. The termination
resistors are located at the far end of each 50
microstrip transmission line, very close to the square
pin headers for the logic analyzer interface. Every EV
board is delivered with the PECL termination resistors
installed on the back side of the board. Each output
links to a 0.100 inch square 2-pin header to ease the
connection to a high-speed logic analyzer such as
Hewlett Packard's HP16500C.
To capture the digital data from the device in demulti-
plexed 1:2 format, each of the 16 channels from the
logic analyzer is connected to the eight primary (P0 to
P7) and eight auxiliary (A0 to A7) outputs. The ADC
provides differential PECL outputs, but most logic ana-
lyzers (such as the HP16500C) have single-ended
acquisition pods. Connect all single-ended logic ana-
lyzer pods to the same phase (either "+" or "-") of the
PECL outputs.
Data Ready (DREADY) Output
The clock pod from the logic analyzer should be con-
nected to the DREADY+ output at JUDR+ on the EV
kits. Since both the primary and auxiliary outputs
change on the rising edge of DREADY+, set the logic
analyzer to trigger on the falling edge. The DREADY
and data outputs are internally time-aligned, which
places the falling edge of DREADY+ in the approximate
center of the valid data window, resulting in the maxi-
mum setup and hold time for the logic analyzer. Set the
logic analyzer's threshold voltage to V
CC
O - 1.3V. For
example, if V
CC
O is +3.3V, the threshold voltage
should be set to +2.0V. The sample offset (trigger
delay) of the logic analyzer should be set to 0ps under
these conditions.
It is also possible to use the DREADY- output for the
acquisition clock. Under this condition, set the logic
analyzer to trigger on the rising edge of the clock.
Table 3 summarizes the digital outputs and their func-
tions.
Table 2. Input Setup and Output Code Results for Differential Analog Inputs
0
-125mV + 0.5LSB
+125mV - 0.5LSB
1
OVERRANGE BIT
11111111
11111111 (full scale)
-125mV
+125mV
OUTPUT CODE
0
+125mV - 0.5LSB
-125mV + 0.5LSB
0
00000001
01111111
toggles 10000000
0V
0V
0
+125mV
-125mV
00000000 (zero scale)
VIN+
VIN-
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