MAX105EVKIT Maxim Integrated Products, MAX105EVKIT Datasheet - Page 13

• Manufacturer Part Number: MAX105EVKIT
• Description: KIT EVAL FOR MAX105 AND MAX107
• Manufacturer: Maxim Integrated Products

Specifications of MAX105EVKIT

• Number Of Adc's: 2
• Number Of Bits: 6
• Sampling Rate (per Second): 800M
• Data Interface: Parallel
• Inputs Per Adc: 1 Differential
• Input Range: 800 mVpp
• Power (typ) @ Conditions: 2.6W @ 800MSPS
• Voltage Supply Source: Analog and Digital
• Operating Temperature: -40°C ~ 85°C
• Utilized Ic / Part: MAX105, MAX107
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Table 1. Digital Output Codes Corresponding to a DC-Coupled Single-Ended Analog
Table 2. Digital Output Codes Corresponding to a DC-Coupled Differential Analog Input
+1.2V, and must be differentially terminated at the far
end of each transmission line pair (true and comple-
mentary) with 100Ω.
A single output pair (DOR+, DOR-) is provided to flag
an out-of-range condition, if either the I or Q channel is
out-of-range, where out-of-range is above +FS or below
-FS. It features the same latency as the ADCs output
data and is demultiplexed in a similar fashion. With a
400MHz system clock, DOR+ and DOR- are clocked at
up to 200MHz.
The MAX107 is designed to work at full-speed for both
single-ended and differential analog inputs without sig-
nificant degradation in its dynamic performance. Both
input channels I (INI+, INI-) and Q (INQ+, INQ-) have
2kΩ impedance and allow for AC- and DC-coupled
input signals. In a typical DC-coupled single-ended
configuration (Table 1), the analog input signals enter
the analog input amplifier stages at the in-phase-input
pins INI+/INQ+, while the inverted phase input INI-
/INQ- pins are AC-coupled to AGNDI/AGNDQ. Single-
ended operation allows for an input amplitude of
800mVp-p, centered around V
+200mV - 0.25LSB + V
-200mV + 0.25LSB + V
+400mV - 0.5LSB + V
-400mV + 0.5LSB + V
IN-PHASE INPUTS
IN-PHASE INPUTS
> +400mV + V
< -400mV + V
>+200mV + V
<-200mV + V
(INI+, INQ+)
(INI+, INQ+)
0V + V
0V + V
Applications Information
REF
REF
______________________________________________________________________________________
REF
REF
REF
REF
Single-Ended Analog Inputs
Dual, 6-Bit, 400Msps ADC with On-Chip,
REF
REF
REF
REF
Out-Of-Range Operation
REF
-200mV + 0.25LSB + V
+200mV - 0.25LSB + V
AC-coupled to AGND_
AC-coupled to AGND_
AC-coupled to AGND_
AC-coupled to AGND_
AC-coupled to AGND_
.
INVERTED INPUTS
INVERTED INPUTS
>+200mV + V
<-200mV + V
(INI-, INQ-)
(INI-, INQ-)
0V + V
REF
REF
REF
REF
REF
Wideband Input Amplifier
To obtain +FS digital outputs with differential input drive
(Table 2), 400mV must be applied between INI+ (INQ+)
and INI- (INQ-). Midscale digital output codes occur
when there is no voltage difference between INI+
(INQ+) and INI- (INQ-). For a -FS digital output code
both in-phase (INI+, INQ+) and inverted input (INI-,
INQ-) must see -400mV.
An RF balun (Figure 3) provides an excellent solution to
convert a single-ended signal to a fully differential sig-
nal, required by the MAX107 for optimum performance.
At higher frequencies, the MAX107 provides better
SFDR and THD with fully differential input signals over
single-ended input signals. In differential input mode,
even-order harmonics are suppressed and each input
requires only half the signal-swing compared to single-
ended mode.
The MAX107 features clock inputs designed for either
single-ended or differential operation with very flexible
input drive requirements. The clock inputs (AC- or DC-
coupled) provide a 5kΩ input impedance to AV
and are internally buffered with a preamplifier to ensure
proper operation of the converter even with small-
amplitude sine-wave sources. The MAX107 was
OUT-OF-RANGE BIT
OUT-OF-RANGE BIT
(DOR+, DOR-)
(DOR+, DOR-)
1
0
0
0
1
1
0
0
0
1
Single-Ended to Differential
Differential Analog Inputs
Conversion Using a Balun
OUTPUT CODE
OUTPUT CODE
000000/111111
000000/111111
011111
011111
100000
100000
011111
011111
100000
100000
Clock Input
CC
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