MAXIM MAX104, MAX106, MAX108 Technical data

General Description
The MAX104/MAX106/MAX108 evaluation kits (EV kits) are designed to simplify evaluation of the devices’ ana­log-to-digital converters (ADCs). Each EV kit contains all circuitry necessary to evaluate the dynamic perfor­mance of these ultra-high-speed converters, including the power-supply generation for the PECL termination voltage (PECLVTT). Since the design combines high­speed analog and digital circuitry, the board layout calls for special precautions and design features.
Connectors for the power supplies (VCCA/VCCI, VCCD, VCCO, VEE), 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 (GETek™ 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 oper­ation over the full commercial temperature range.
Features
50Ω Clock and Analog Inputs Through SMA
Coaxial Connectors
±250mV Input Signal RangeDemultiplexed Differential PECL OutputsOn-Board Generation of PECL Termination
Voltage (PECLV
TT
)
On-Board Generation of ECL Termination Voltage
(ECLV
TT
)
Separate Analog and Digital Power and Ground
Connections with Optimized Four-Layer PCB
Square-Pin Headers for Easy Connection of Logic
Analyzer to Digital Outputs
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
MAX104EVKIT MAX106EVKIT
0°C to +70°C
0°C to +70°C
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 descrip­tion of reset input operation.
2R3, R4
DESIGNATION
10kpotentiometer 1R2
1N5819 Schottky diode1D1
47pF ±10% ceramic capacitors (0402)
20
C3–C6, C15, C16,
C22–C25, C33–C37,
C42–C45, C50
0.01µF ±10% ceramic capacitors (0603)
30
C2, C7–C12, C14,
C17, C18, C19, C21, C26–C30, C32, C41, C47,
C49, C51–C59
10µF ±10%, 16V tantalum caps AVX TAJD106D016
7
C1, C13, C20, C31,
C40, C46, C48
DESCRIPTIONQTY
MAX108EVKIT*
0°C to +70°C 192 ESBGA
SAMPLING
RATE
1Gsps 600Msps
1.5Gsps
GETek is trademark of GE Electromaterials.
49.9±1% resistors (0603)38
R5–R38,
R44–R47
DESIGNATION DESCRIPTIONQTY
2-pin headers41
JU2, JU4, JU5,
JUA0- to JUA7-,
JUA0+ to JUA7+,
JUP0- to JUP7-,
JUP0+ to JUP7+,
JUOR+, JUOR-, JUDR-, JUDR+,
JURO-, JURO+
3-pin headers5JU3, JU6–JU9
SMA connectors (edge mounted)10J1–J10
158±1% resistors (0603)2R52, R54
243±1% resistors (0603)2R51, R53
*
Future product—contact factory for availability.
查询MAX104EVKIT供应商
_________________________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 single­ended sine- wave (CLK- is 50reverse-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 sine­wave clock drive.
1) Connect a -5V power supply capable of providing
-250mA to the pad marked VEE. Connect the sup­ply’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 VCCI pad. Connect the supply’s ground to the GNDI pad.
3) Connect a +5V power supply capable of providing 250mA to the VCCD 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 VCCO 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 sin­gle-ended clock inputs, feed a +4dBm (500mV amplitude) power level from the signal generator into the CLK+ input and terminate the unused CLK­input with 50to 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 sin­gle-ended (see the sections
Single-Ended Analog
Inputs
and
Differential Analog Inputs
in the devices’ data sheets). For best results, use a narrow band­pass filter designed for the frequency of interest to reduce the harmonic distortion from the signal gen­erator.
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 VCCO supply voltage -1.3V. For example, if VCCO = +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)
Shunts7None
Test points24
VCCO, VCCD,
GNDD, PECLVTT,
GNDA, VCCA,
VCCI, GNDI, VEE,
ECLV
TT
Protective feet4None
Heatsink International Electronic Research Corp. BDN09-3CB/A01
1None
MAX104CHC, MAX106CHC, or MAX108CHC (192-contact ESBGA™)
1U1
LM2991S, low-dropout adjustable linear regulator
2U3, U4
MAX104EVKIT circuit board1None MAX104, MAX106, or MAX108 data
sheet
1None
DESIGNATION DESCRIPTIONQTY
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 opera­tion with very flexible input drive requirements. Each clock input is terminated with an on-chip, laser-trimmed 50Ω resistor to CLKCOM (clock termination return). The traces from the SMA inputs to the high-speed data con­verter are 50microstrip 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 ana­log and clock inputs, creates a -2V termination voltage (ECLVTT) for operation with ECL clock sources. The voltage is generated by an LM2991 voltage regulator operated from the board’s -5V VEEpower supply. To enable this ECLVTTbias generator, first remove short­ing 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 (VCCI). The EV kits are delivered with the ECLVTTbias generator turned off and CLKCOM tied to GNDI (JU2 installed).
NOTE: If the regulator’s shutdown logic level is not present (VCCI on first) before the VEEsupply is turned on, the regulator will momentarily turn on until the VCCI 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 pro­tected 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 ECLVTT-2V bias genera­tor 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-cou­pled 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 VBBvoltage (-1.3V nominal).
Analog Input Requirements
The analog inputs to the ADC on the EV board are pro­vided 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 50NiCr 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 50microstrip 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 distor­tion. 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
00V-250mV + 1LSB
0
00000001
01111111
toggles 10000000
0V0V
00V-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 sup­ply 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 dam­aging the internal reference with the external refer­ence supply.
Offset Adjust
The devices also provide a control input (VOSADJ) to eliminate any offset from additional preamplifiers dri­ving the ADC. The VOSADJ control input is a self­biased voltage divider from the internal +2.5V precision reference. Under normal-use conditions, the control input is left floating.
The EV kits include a 10kpotentiometer 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 VCCO 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 VCCO supply voltage is +3.3V.
The PECL outputs are standard open-emitter types and require external 50termination 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 demulti­plexed 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 ana­lyzers (such as the HP16500C) have single-ended acquisition pods. Connect all single-ended logic ana­lyzer pods to the same phase (either “+” or “-”) of the PECL outputs.
Data Ready (DREADY) Output
The clock pod from the logic analyzer should be con­nected 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 maxi­mum setup and hold time for the logic analyzer. Set the logic analyzer’s threshold voltage to VCCO - 1.3V. For example, if VCCO 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 func­tions.
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
0V0V
0+125mV-125mV 00000000 (zero scale)
VIN+ VIN-
Evaluate: MAX104/MAX106/MAX108
MAX104/MAX106/MAX108 Evaluation Kits
6 _______________________________________________________________________________________
Demultiplexer Settings
Demultiplexed DIV2 Mode
This mode reduces the output data rate to one-half the sample clock rate. The demultiplexed outputs are pre­sented in dual 8-bit format with two consecutive sam­ples in the primary and auxiliary output ports on the ris­ing edge of the data ready clock. To activate this mode, jumpers JU7 (DEMUXEN), JU8 (AUXEN2), and JU9 (AUXEN1) have to be in the ON position, and DIVSELECT (JU6) must be set to position 2.
NOTE: Each EV kit is shipped with jumpers JU7, JU8, and JU9 installed in the ON position and JU6 set to 2.
Non-Demultiplexed DIV1 Mode
It is also possible to operate the ADC in a non-demulti­plexed mode. In this mode, the internal demultiplexer is disabled and the sampled data is presented to the pri­mary output port only. To consume less power, the aux­iliary port can be shut down by two separate inputs (AUXEN1 and AUXEN2). To enter this mode, place jumpers JU7 (DEMUXEN), JU8 (AUXEN2), and JU9 (AUXEN1) in the OFF position. The position of the DIVS­ELECT (JU6) jumper is a don’t care. To save additional power, remove all the 50pull-down resistors (R5–R20) on the auxiliary output port. It is not necessary to remove the resistors; however, both the true and com­plementary PECL outputs will pull up to the VOHlevel.
Table 3. PECL Outputs and Functions
JUA0+ to JUA7+, JUA0- to JUA7-
A0+ to A7+,
A0- to A7-
JUP0+ to JUP7+,
JUP0- to JUP7-
P0+ to P7+,
P0- to P7-
JUOR+, JUOR-OR+, OR­JUDR+, JUDR-DREADY+, DREADY-
PECL OUTPUT
SIGNALS
EV KIT JUMPER
LOCATION
Auxiliary Port Differential Outputs from LSB to MSB. A “+” indicates the true value; a “-” denotes the complementary outputs.
Primary Port Differential Outputs from LSB to MSB. A “+” indicates the true value; a “-” denotes the complementary outputs.
Overrange’s True and Complementary Outputs. Data-Ready PECL Output Latch Clock. Output
data changes on the rising edge of DREADY+.
FUNCTION
Demux Reset Input Signals. Resets the internal demux when asserted.
Reset Outputs—for resetting additional external demux devices.
J5, J6 (SMA connectors)RSTIN+, RSTIN-
JURO+, JURO-RSTOUT+, RSTOUT-
DEMUXEN (JU7)
OFF ON
AUXEN2 (JU8)
OFF ON
AUXEN1 (JU9)
OFF ON
DIVSELECT (JU6)
24
DEMUXEN (JU7)
OFF ON
AUXEN2 (JU8)
OFF ON
AUXEN1 (JU9)
OFF ON
DIVSELECT (JU6)
X 2
X = Leave open or don’t care
X
X
4
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