MAX5891EGK+D Maxim Integrated Products, MAX5891EGK+D Datasheet - Page 12

• Manufacturer Part Number: MAX5891EGK+D
• Description: IC DAC 16BIT LVDS 600MSPS 68-QFN
• Manufacturer: Maxim Integrated Products

Specifications of MAX5891EGK+D

• Settling Time: 11ns
• Number Of Bits: 16
• Data Interface: Parallel
• Number Of Converters: 1
• Voltage Supply Source: Analog and Digital
• Power Dissipation (max): 301mW
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 68-QFN Exposed Pad
• Conversion Rate: 600 MSPs
• Resolution: 16 bit
• Interface Type: Parallel or LVDS
• Supply Voltage (max): 1.89 V, 3.465 V
• Supply Voltage (min): 1.71 V, 3.135 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: - 40 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Grounding and power-supply decoupling strongly influ-
ence the MAX5891 performance. Unwanted digital
crosstalk coupling through the input, reference, power
supply, and ground connections affects dynamic per-
formance. High-speed, high-frequency applications
require closely followed proper grounding and power-
supply decoupling. These techniques reduce EMI and
internal crosstalk that can significantly affect the
MAX5891 dynamic performance.
Use a multilayer printed circuit board (PCB) with sepa-
rate ground and power-supply planes. Run high-speed
signals on lines directly above the ground plane. Keep
digital signals as far away from sensitive analog inputs
and outputs, reference input sense lines, common-
mode inputs, and clock inputs as practical. Use a sym-
metric design of clock input and the analog output lines
to minimize 2nd-order harmonic distortion components,
thus optimizing the DAC’s dynamic performance. Keep
digital signal paths short and run lengths matched to
avoid propagation delay and data skew mismatches.
The MAX5891 requires five separate power-supply
inputs for analog (AV
(DV
Decouple each AV
DV
to the device as possible with the shortest possible con-
nection to the respective ground plane (Figure 7).
Connect all of the 3.3V supplies together at one point
with ferrite beads to minimize supply noise coupling.
Decouple all five power-supply voltages at the point they
enter the PCB with tantalum or electrolytic capacitors.
Ferrite beads with additional decoupling capacitors
forming a pi network can also improve performance.
Similarly, connect all 1.8V supplies together at one point
with ferrite beads.
16-Bit, 600Msps, High-Dynamic-Performance
DAC with LVDS Inputs
Figure 6. Differential Output Configuration
12
DATA INPUTS
Grounding, Bypassing, and Power-Supply
DD1.8
DD1.8
______________________________________________________________________________________
D0–D15
LVDS
input with a separate 0.1µF capacitor as close
and DV
DD3.3
DD3.3
MAX5891
AGND
, AV
), and clock (AV
DD1.8
DD1.8
OUTP
OUTN
and AV
, AV
Considerations
CLK
DD3.3
, DV
CLK
25Ω
50Ω
25Ω
) circuitry.
DD3.3
), digital
OUTP
OUTN
, and
The analog and digital power-supply inputs AV
AV
voltage range. The analog and digital power-supply
inputs AV
supply voltage range.
The MAX5891 is packaged in a 68-pin QFN-EP pack-
age with exposed paddle, providing optimized DAC AC
performance. The exposed pad must be soldered to
the ground plane of the PCB. Thermal efficiency is not
the key factor, since the MAX5891 features low- power
operation. The exposed pad ensures a solid ground
connection between the DAC and the PCB’s ground
layer.
The data converter die attaches to an EP lead frame
with the back of this frame exposed at the package
bottom surface, facing the PCB side of the package.
This allows for a solid attachment of the package to the
PCB with standard infrared (IR) reflow soldering tech-
niques. A specially created land pattern on the PCB,
matching the size of the EP (6mm x 6mm), ensures the
proper attachment and grounding of the DAC. Place
vias into the land area and implement large ground
Figure 7. Recommended Power-Supply Decoupling and
Bypassing Circuitry
CLK
BYPASSING—DAC LEVEL
DATA INPUTS
*FERRITE BEADS
, and DV
D0–D15
DD1.8
LVDS
DD3.3
and DV
1.8V VOLTAGE SUPPLY
*
*
AV
AV
allow a 3.135V to 3.465V supply
3.3V VOLTAGE SUPPLY
DD3.3
DD1.8
DD1.8
0.1μF
0.1μF
MAX5891
*
*
DV
DV
DD3.3
DD1.8
allow a 1.71V to 1.89V
0.1μF
0.1μF
AV
*
CLK
OUTP
OUTN
0.1μF
DD3.3
,