MAX5174AEEE MAXIM [Maxim Integrated Products], MAX5174AEEE Datasheet - Page 14

• Manufacturer Part Number: MAX5174AEEE
• Description: Low-Power, Serial, 12-Bit DACs with Voltage Output
• Manufacturer: MAXIM [Maxim Integrated Products]

Low-Power, Serial, 12-Bit DACs
with Voltage Output
The MAX5174/MAX5176 accept references with AC
components, as long as the reference voltage remains
between 0 and V
nique for applying a sine-wave signal to the reference
input where the AC signal is offset before being applied
to REF. The reference voltage must remain above
AGND.
Wire-wrap boards are not recommended. For optimum
system performance, use printed circuit boards with
separate analog and digital ground planes. Connect
the two ground planes together at the low-impedance
power-supply source. Connect DGND and AGND pins
together at the IC. The best ground connection is
achieved by connecting the DAC’s DGND and AGND
Figure 9. Daisy-Chaining MAX5174/MAX5175 Devices
Figure 10. Multiple MAX5174/MAX5176s Sharing Common DIN and SCLK Lines
14
Power-Supply and Layout Considerations
______________________________________________________________________________________
SCLK
CS1
CS2
CS3
DIN
DD
- 1.4V. Figure 11 shows a tech-
SCLK
DIN
CS
MAX5174
MAX5176
Using an AC Reference
CS
SCLK
DIN
DOUT
MAX5174
MAX5176
SCLK
DIN
CS
MAX5174
MAX5176
CS
SCLK
DIN
DOUT
MAX5174
MAX5176
pins together and connecting that point to the system
analog ground plane. This is useful because if the
DAC’s DGND is connected to the system digital
ground, digital noise may infiltrate the DAC’s analog
portion.
Bypass the power supply with a 4.7µF capacitor in par-
allel with a 0.1µF capacitor to AGND. Minimize capaci-
tor lead lengths to reduce inductance. If noise
becomes an issue, use shielding and/or ferrite beads to
increase isolation.
To maintain INL and DNL performance as well as gain
drift, it is extremely important to provide the lowest pos-
sible reference output impedance at the DAC reference
input pin. INL degrades if the series resistance on REF
pin exceeds 0.1Ω. The same consideration must be
made for the AGND pin.
SCLK
DIN
CS
MAX5174
MAX5176
CS
SCLK
DIN
MAX5174
MAX5176
DOUT
TO OTHER
SERIAL DEVICES
TO OTHER
SERIAL DEVICES