MAX107ECS+ Maxim Integrated Products, MAX107ECS+ Datasheet - Page 16
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MAX107ECS+
Manufacturer Part Number
MAX107ECS+
Description
IC ADC 6BIT 400MSPS DL 80-TQFP
Manufacturer
Maxim Integrated Products
Datasheet
1.MAX107ECS.pdf
(21 pages)
Specifications of MAX107ECS+
Number Of Bits
6
Sampling Rate (per Second)
400M
Data Interface
Parallel
Number Of Converters
2
Power Dissipation (max)
2.6W
Voltage Supply Source
Analog and Digital
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
80-TQFP Exposed Pad, 80-eTQFP, 80-HTQFP, 80-VQFP
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Grounding and power supply decoupling strongly influ-
ence the MAX107’s performance. At 400MHz clock fre-
quency and 6-bit resolution, unwanted digital crosstalk
may couple through the input, reference, power supply,
ground connections, and adversely influence the
dynamic performance of the ADC. In addition, the I&Q
inputs may crosstalk through poorly designed decou-
pling circuits. Therefore, closely follow the grounding
and power-supply decoupling guidelines in
Maxim strongly recommends using a multilayer printed
circuit board (PC board) with separate ground and
power supply planes. Since the MAX107 has separate
analog and digital ground connections (AGND, AGNDI,
AGNDQ, AGNDR, OGNDI, and OGNDQ, respectively).
The PC board should feature separate sections desig-
nated to analog (AGND) and digital (OGND), connect-
ed at only one point. Digital signals should run above
the digital ground plane and analog signals should run
above the analog ground plane. Keep digital signals far
away from the sensitive analog inputs, reference inputs,
and clock inputs. High-speed signals, including clocks,
Dual, 6-Bit, 400Msps ADC with On-Chip,
Wideband Input Amplifier
Figure 8. Typical I/Q Application
16
FROM PREVIOUS STAGE
DEMODULATOR
______________________________________________________________________________________
QUADRATURE
MAX2108
90°
NYQUIST
NYQUIST
FILTER
FILTER
LO
Grounding, Bypassing,
2kΩ
2kΩ
and Board Layout
PRE-AMP
PRE-AMP
CM BUFFER
CM BUFFER
Figure 9.
REFERENCE
REF
REF
Q ADC
I ADC
analog inputs, and digital outputs, should be routed on
50Ω microstrip lines, such as those employed on the
MAX105EV kit.
The MAX107 has separate analog and digital power-
supply inputs:
•
•
•
•
•
•
All supplies should be decoupled with large tantalum or
electrolytic capacitors at the point they enter the PC
board. For best performance, bypass all power sup-
plies to the appropriate ground with a 10µF tantalum
AV
input section of the clock circuit.
AV
common-mode buffer, pre-amp and quantizer.
AV
nel common-mode buffer, pre-amp and quantizer.
AV
bandgap reference.
OV
nel output drivers and DREADY circuitry.
OV
Q-channel output drivers and DOR circuitry.
DOR
CC
CC
CC
CC
CC
CC
1:2
I = +5V ±5%: Power supply for the I-channel
Q = +5V ±5%: Power supply for the Q-chan-
R = +5V ±5%: Power supply for the on-chip
I = +3.3V ±10%: Power supply for the I-chan-
Q = +3.3V ±10%: Power supply for the
= +5V ±5%: Power supply for the analog
DATA PORT
DATA PORT
DATA PORT
DATA PORT
AUXILIARY
AUXILIARY
PRIMARY
PRIMARY
P0Q-P5Q
A0Q-A5Q
P0I-P5I
A0I-A5I
DREADY+/DREADY-
DOR+/DOR-
AV
CC
10kΩ
10kΩ
D
S
P