MAX521BEAG-T Maxim Integrated, MAX521BEAG-T Datasheet - Page 16

• Manufacturer Part Number: MAX521BEAG-T
• Description: Digital to Analog Converters - DAC
• Manufacturer: Maxim Integrated

Specifications of MAX521BEAG-T

• Number Of Converters: 8
• Resolution: 8 bit
• Interface Type: Serial (2-Wire, I2C)
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: - 40 C
• Supply Voltage - Max: 5.5 V
• Supply Voltage - Min: 4.5 V

Quad/Octal, 2-Wire Serial 8-Bit DACs
with Rail-to-Rail Outputs
Figure 15a. Typical Trimming Circuit
In shutdown mode, the MAX520/MAX521 reference
inputs are disconnected from the R-2R ladder inputs,
which saves power when the reference is not powered
down. In addition, the MAX521’s output buffers are dis-
abled, greatly reducing the supply current. The
MAX520’s operating supply current does not change in
shutdown mode. The Command Byte and Output Byte
section describes how to enter and exit shutdown
mode.
Bypass V
V
(AGND) and digital ground (DGND) pins should be
connected in a “star” configuration to the highest quali-
ty ground available, which should be located as close
to the MAX521 as possible.
Careful PC board layout minimizes crosstalk among
DAC outputs, reference inputs, and digital inputs.
Figure 16 shows the suggested PC board layout to mini-
mize crosstalk.
16
__________Applications Information
DD
______________________________________________________________________________________
and DGND as possible. The analog ground
DAC
DD
with a 0.1µF capacitor, located as close to
Power-Supply Bypassing and
R
Ground Management
IN
(1%)
R
T
Shutdown Mode
R
F
Figure 15b. MAX520A Trimming Circuit
Figure 16. PC Board Layout for Minimizing Crosstalk (MAX521
bottom view, DIP package)
MAX520A
DAC
OUT2
OUT3
REF2
REF3
16k
(1%)
SYSTEM GND
R
IN
PIN1
OUT1
OUT0
REF1
REF0
R
F