MAX5181BEEG MAXIM [Maxim Integrated Products], MAX5181BEEG Datasheet - Page 14

• 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 8a. Traditional Arbitrary Waveform Generation
Figure 8b. Direct Digital Synthesis AWG
relaxed requirements in resolution (10-bit AWGs). To
increase an AWG’s high-frequency accuracy, tempera-
ture stability, wide-band tuning, and past phase-contin-
uos frequency switching, the user may approach a
direct digital synthesis (DDS) AWG (Figure 8b). This
DDS loop supports standard waveforms that are repeti-
tive, such as sine, square, TTL, and triangular wave-
forms. DDS allows for precise control of the
data-stream input to the DAC. Data for one complete
output waveform cycle is sequentially stored in a RAM.
As the RAM addresses are changing, the DAC con-
verts the incoming data bits into a corresponding volt-
age waveform. The resulting output signal frequency is
proportional to the frequency rate at which the RAM
addresses are changed.
14
*MAX5181 ONLY
______________________________________________________________________________________
INCREMENT
REGISTER
PHASE
GENERATOR
*MAX5181 ONLY
PIR
CLOCK
A
D
D
R
E
COUNTER
CLOCK
GENERATOR
FEEDBACK LOOP
ACCUMULATOR
FOR DATA BITS
ACCUMULATOR
PHASE
ADR
ADR
WAVEFORM
MEMORY
(RAM)
WAVEFORM
MEMORY
(RAM)
DATA
10
DATA
9.6k*
10
Grounding and power-supply decoupling strongly influ-
ence the MAX5181/MAX5184’s performance. Unwanted
digital crosstalk may couple through the input, refer-
ence, power-supply, and ground connections, which
may affect dynamic specifications like SNR or SFDR. In
addition, electromagnetic interference (EMI) can either
couple into or be generated by the MAX5181/
MAX5184. Therefore, grounding and power-supply
decoupling guidelines for high-speed, high-frequency
applications should be closely followed.
First, a multilayer PC board with separate ground and
power-supply planes is recommended. High-speed
signals should be run on controlled impedance lines
9.6k*
AV
Grounding and Power-Supply Decoupling
DD
MAX5181
MAX5184
AV
DD
DV
MAX5181
MAX5184
DD
DV
DD
400Ω*
400Ω*
RECONSTRUCTION
RECONSTRUCTION
LOWPASS
VARIABLE
FILTER
LOWPASS
VARIABLE
fc
FILTER
fc
(ANALOG OUTPUT)
(ANALOG OUTPUT)
WAVEFORM
FILTERED
WAVEFORM
FILTERED