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MAX5855 Datasheet(PDF) 41 Page - Maxim Integrated Products

Part No. MAX5855
Description  16-Bit, 4.9Gsps Wideband Interpolating and Modulating RF DAC with JESD204B Interface
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Maker  MAXIM [Maxim Integrated Products]
Homepage  http://www.maxim-ic.com
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MAX5855 Datasheet(HTML) 41 Page - Maxim Integrated Products

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10kΩ
1µF
1.2V
REFERENCE
REFIO
FSADJ
CURRENT
SOURCE
ARRAY
DAC
IREF
DACREF
OUTP
OUTN
MAX5855
IREF =
VREFIO
RSET
RSET
10kΩ
1µF
1.2V
REFERENCE
REFIO
FSADJ
CURRENT
SOURCE
ARRAY
DAC
IREF
DACREF
OUTP
OUTN
MAX5855
IREF =
VREFIO
RSET
RSET
IN
OUT
2.5V TO 12.6V
MAX6161
0.1µF
GND
1.25V
(a) INTERNAL REFERENCE CONFIGURATION
(b) EXTERNAL REFERENCE CONFIGURATION
Figure 24. Setting the DAC Output Full-Scale Using an (a) Internal or (b) External Reference Voltage
Analog Output
The device is a differential current-steering DAC with built-in output termination resistors. The outputs are terminated to
AVDD2 providing a 50Ω differential output resistance. In addition to the signal current, a constant current sink (IFIX) equal
to one half IOUTFS is connected to each differential DAC output. Figure 25 shows an equivalent circuit for the internal
output structure of the device. The circuit has some resistive, capacitive, and inductive elements. These elements have
been minimized in order to achieve the highest possible output bandwidth (2GHz, typical).
In addition, the device requires a differential external termination (i.e., double termination). This external termination can
be accomplished with a differential 50Ω load or a single-ended 50Ω load interfaced through a transformer. RF chokes to
the AVDD2 supply should be used with the transformer coupled output. A typical transformer coupled configuration for
high-frequency operation is shown in Figure 25.
I1 = IFIX + IOUTFS x ((2
N
– CODE)/2N
I2 = IFIX + IOUTFS x CODE/2
N
1µF
2.2µH
AVDD2
2.2µH
0.01µF
0.01µF
6
4
1
3
T1
OUTN
OUTP
25Ω
25Ω
AVDD2
I2
I1
MAX5855
Figure 25. Typical DAC Output Configuration
MAX5855
16-Bit, 4.9Gsps Wideband Interpolating
and Modulating RF DAC with JESD204B Interface
www.maximintegrated.com
Maxim Integrated | 41


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