max5259 Maxim Integrated Products, Inc., max5259 Datasheet - Page 17

• Manufacturer Part Number: max5259
• Description: +3v/+5v, Low-power, 8-bit Octal Dacs With Rail-to-rail Output Buffers
• Manufacturer: Maxim Integrated Products, Inc.

Figure 8. DAC Simplified Circuit Diagram
Figure 10. Suggested PC Board Layout for Minimizing
Crosstalk (Bottom View)
The voltage applied to REF should not exceed V
any time. If proper power sequencing is not possible,
connect an external Schottky diode between REF and
V
DD
D7
D6
D5
D4
OUTB
OUTA
LDAC
GND
to ensure compliance with the absolute maximum
V
REF
DD
DAC A
REF
______________________________________________________________________________________
R0
SYSTEM GND
D3
+3V/+5V, Low-Power, 8-Bit Octal DAC
R1
D2
LSB DECODER
Power Sequencing
D1
D0
with Rail-to-Rail Output Buffers
R255
R15
R16
OUTC
OUTD
DOUT
DIN
DD
at
ratings. Do not apply signals to the digital inputs before
the device is fully powered-up.
Bypass V
V
minimizes crosstalk among DAC outputs and digital
inputs. Figure 10 shows suggested circuit board layout
to minimize crosstalk.
In unipolar operation, the output voltages and the refer-
ence input are the same polarity. Figure 11 shows the
MAX5258/MAX5259 unipolar configuration, and Table 2
shows the unipolar code.
Figure 9. Effect of Negative Offset (Single Supply)
DD
and GND as possible. Careful PC board layout
NEGATIVE
OFFSET
DD
VOLTAGE
OUTPUT
with a 0.1µF capacitor, located as close to
O
Unipolar-Output, Two-Quadrant
Power-Supply Bypassing and
DAC CODE
Ground Management
Multiplication
17