max5121beee Maxim Integrated Products, Inc., max5121beee Datasheet - Page 17

• Manufacturer Part Number: max5121beee
• Description: 3v/5v, 12-bit, Serial Voltage-output Dacs With Internal Reference
• Manufacturer: Maxim Integrated Products, Inc.

The MAX5120/MAX5121 have multiplying capabilities
within the reference input voltage range specifications.
Figure 14 shows a technique for applying a sinusoidal
input to REF, where the AC signal is offset before being
applied to the reference input.
On power-up, the input and DAC registers are cleared
to either zero (RSTVAL = DGND) or midscale (RSTVAL
Figure 13. Multiple Devices Share One Common Digital Input (DIN)
Figure 14. External Reference with AC Components
SCLK
CS1
CS2
CS3
DIN
+3V/+5V, 12-Bit, Serial Voltage-Output DACs
Power-Supply and Bypassing
______________________________________________________________________________________
Using an External Reference
+5V/+3V
REFERENCE
500mVp-p
INPUT
AC
CS
SCLK
DIN
with AC Components
26k
MAX5120
MAX5121
I
10k
Considerations
+5V/+3V
MAX495
CS
SCLK
DIN
AGND
MAX5120
MAX5121
DAC
with Internal Reference
REF
= V
tor in parallel with a 0.1µF capacitor to AGND. Minimize
lead lengths to reduce lead inductance.
Digital and AC transient signals coupling to AGND can
create noise at the output. Connect AGND to the high-
est quality ground available. Use proper grounding
techniques, such as a multilayer board with a low-
inductance ground plane. Wire-wrapped boards and
sockets are not recommended. If noise becomes an
issue, shielding may be required.
II
DD
MAX5120
MAX5121
). Bypass the power supply with a 4.7µF capaci-
V
DD
DGND
0.6384R
R
CS
SCLK
DIN
MAX5121
MAX5120
OUT
OS
III
Layout Considerations
TO OTHER
SERIAL DEVICES
17