MAX5181BEEG MAXIM [Maxim Integrated Products], MAX5181BEEG Datasheet - Page 12

• Manufacturer Part Number: MAX5181BEEG
• Description: 10-Bit, 40MHz, Current/Voltage-Output DACs
• Manufacturer: MAXIM [Maxim Integrated Products]

10-Bit, 40MHz, Current/Voltage-Output DACs
Figure 5a. Integral Nonlinearity
Figure 5c. Offset Error
The I/Q reconstruction system is completed by a quad-
rature modulator that combines the reconstructed com-
ponents with in-phase and quadrature carrier
frequencies and then sums both outputs to provide the
QAM signal.
Designing a traditional arbitrary waveform generator
(AWG) requires five major functional blocks (Figure 8a):
clock generator, counter, waveform memory, DAC for
waveform reconstruction, and output filter. The wave-
form memory contains the sequentially stored digital
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7
6
5
4
3
2
1
0
3
2
1
0
Using the MAX5181/MAX5184 for
000
000
Arbitrary Waveform Generation
ACTUAL
OFFSET
POINT
001
IDEAL OFFSET
POINT
DIAGRAM
ACTUAL
010
001
DIGITAL INPUT CODE
DIGITAL INPUT CODE
AT STEP
001 (1/4 LSB )
011
OFFSET ERROR
(+1 1/4 LSB)
100
AT STEP
011 (1/2 LSB )
010
101
IDEAL DIAGRAM
110
011
111
replica of the desired analog waveforms. This memory
shares a common clock with the DAC.
For each clock cycle, a counter adds one count to the
address for the waveform memory. The memory then
loads the next value to the DAC, which generates an
analog output voltage corresponding to that data value.
A DAC output filter can either be a simple or complex
lowpass filter, depending on the AWG requirements for
waveform function and frequencies. The main limita-
tions of the AWG’s flexibility are DAC resolution and
dynamic performance, memory length, clock frequen-
cy, and the filter characteristics.
Although the MAX5181/MAX5184 offer high-frequency
operation and excellent dynamics, they are suitable for
Figure 5b. Differential Nonlinearity
Figure 5d. Gain Error
6
5
4
3
2
1
0
7
6
5
4
0
000
000
IDEAL DIAGRAM
100
001
GAIN ERROR
(-1 1/4 LSB)
IDEAL FULL-SCALE OUTPUT
DIGITAL INPUT CODE
DIGITAL INPUT CODE
010
101
1 LSB
011
DIFFERENTIAL
LINEARITY ERROR (+1/4 LSB)
DIFFERENTIAL LINEARITY
ERROR (-1/4 LSB)
100
110
FULL-SCALE
101
OUTPUT
ACTUAL
1 LSB
111