MAX5856AECM+TD Maxim Integrated Products, MAX5856AECM+TD Datasheet - Page 16

• Manufacturer Part Number: MAX5856AECM+TD
• Description: IC DAC 8BIT DUAL 300MSPS 48-TQFP
• Manufacturer: Maxim Integrated Products

Specifications of MAX5856AECM+TD

• Settling Time: 11ns
• Number Of Bits: 8
• Data Interface: Parallel
• Number Of Converters: 2
• Voltage Supply Source: Single Supply
• Power Dissipation (max): 792mW
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 48-TQFP Exposed Pad, 48-eTQFP, 48-HTQFP, 48-VQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

This example demonstrates that 4x interpolation with
digital filtering yields significant benefits in reducing sys-
tem complexity, improving dynamic performance, and
lowering cost. Data can be written to the MAX5856A at
much lower speeds while achieving image attenuation
greater than 60dB and image separation beyond three
octaves. The main benefit is in analog reconstruction fil-
Dual 8-Bit, 300Msps DAC with 4x/2x/1x
Interpolation Filters and PLL
Figure 3. MAX5856A in 4x Interpolation Mode
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SOLUTION 2
SOLUTION 3
SOLUTION 1
BW = ±10MHz
BW = ±10MHz
20MHz
±10MHz
20MHz
20MHz
f
OUT
f
f
OUT
OUT
LOWER ORDER ANALOG FILTER
FREQUENCY AXIS NOT TO SCALE
FREQUENCY AXIS NOT TO SCALE
FREQUENCY AXIS NOT TO SCALE
SIMPLE ANALOG FILTER
f
DAC
IMAGE
48MHz
- f
OUT
ter design. Reducing the filter order eases gain/phase
matching while lowering filter cost and saving board
space. Because the data rate is lowered to 71.6MHz, the
setup and hold times are manageable and the clock sig-
nal source is simplified, which results in improved sys-
tem reliability and lower cost.
IMAGE SEPARATION = 18MHz
LESS THAN ONE OCTAVE
HIGH ORDER ANALOG FILTER
78MHz
f
71.6MHz
DAC
f
ATTENUATION > 60dB
DATA
DIGITAL FILTER
f
DAC
108MHz
IMAGE
+ f
f
DAC
210MHz
IMAGE
OUT
IMAGE SEPARATION = 180MHz
- f
HIGH-SPEED CLK = 240MHz
OUT
240MHz
f
f
DAC
DAC
256MHz
SEPARATION > 3-OCTAVES
IMAGE
- f
NEW FIRST IMAGE
OUT
f
DAC
270MHz
IMAGE
286MHz
+ f
f
DAC
OUT
f
DAC
316MHz
IMAGE
+ f
OUT