MAX105 Maxim, MAX105 Datasheet - Page 12

• Manufacturer Part Number: MAX105
• Description: Dual / 6-Bit / 800Msps ADC with On-Chip / Wideband Input Amplifier
• Manufacturer: Maxim

signal-to-noise ratio (SNR) specifications will degrade.
The MAX105’s on-board, wide-bandwidth input ampli-
fiers (I&Q) reduce this effect significantly, allowing pre-
cise digitizing of fast analog data at high conversion
rates. The input amplifiers buffer the input signal and
allow a full-scale signal input range of ±400mV
(800mV
The MAX105 features an integrated, buffered +2.5V
precision bandgap reference. This reference is internal-
ly scaled to match the analog input range specification
of ±400mV. The data converter’s reference output
(REF) can source up to 500µA. REF should be buffered,
if used to supply external devices.
The MAX105 provides data in two’s complement format
to differential LVDS outputs. A simplified circuit
schematic of the LVDS output cells is shown in
2. All LVDS outputs are powered from separate I-chan-
nel OV
supplies, which may be operated at +3.3V ±10%. The
Dual, 6-Bit, 800Msps ADC with On-Chip,
Wideband Input Amplifier
Figure 1. MAX105 Flash Converter Architecture
12
______________________________________________________________________________________
INQ+
INQ-
INI+
INI-
CC
p-p
I and Q-channel OV
).
2kΩ
2kΩ
PRE-AMP
PRE-AMP
CM BUFFER
CM BUFFER
LVDS Digital Outputs
CC
Internal Reference
Q (Q-channel) power
REFERENCE
REF
Figure
REF
REF
Q ADC
I ADC
MAX105
Figure 2. Simplified LVDS Output Model
DOR
DOR+/DOR-
1:2
55Ω
DREADY+/DREADY-
DATA PORT
DATA PORT
DATA PORT
DATA PORT
AUXILIARY
AUXILIARY
PRIMARY
PRIMARY
P0Q-P5Q
A0Q-A5Q
OV
P0I-P5I
A0I-A5I
CC
I
55Ω
AV
CC
10kΩ
10kΩ
OV
MAX105
CC
I
OV
CC
P0I+/P0I-
P5I+/P5I-
A0I+/A0I-
A5I+/A5I-
CLK+
CLK-
P0Q+/P0Q-
P5Q+/P5Q-
A0Q+/A0Q-
A5Q+/A5Q-
I
P0I+ - P5I+
A0I+ - A5I+
P0I- - P5I-
A0I- - A5I-