max5134 Maxim Integrated Products, Inc., max5134 Datasheet - Page 14

• Manufacturer Part Number: max5134
• Description: Low-power, Quad 16-bit, Buffered Voltage-output Dac
• Manufacturer: Maxim Integrated Products, Inc.

Low-Power, Quad 16-Bit,
Buffered Voltage-Output DAC
Figure 7. Output Timing
On power-up, the input registers are set to zero, DAC
outputs power up to zero or midscale, depending on
the configuration of M/Z. Connect M/Z to GND to power
the outputs to GND. Connect M/Z to AVDD to power the
outputs to midscale.
To optimize DAC linearity, wait until the supplies have
settled. Set the LIN bit in the DAC linearity register; wait
10ms, and clear the LIN bit.
The MAX5134 unipolar output voltage range is 0 to
V
parallel with 200pF.
Use the MAX5134 in bipolar applications with additional
external components (see the Typical Operating Circuit ).
For best performance, use a separate supply for the
MAX5134. Bypass both DVDD and AVDD with high-
quality ceramic capacitors to a low-impedance ground
as close as possible to the device. Minimize lead
lengths to reduce lead inductance. Connect both
MAX5134 GND inputs to the analog ground plane.
Table 2. Input Code vs. Output Voltage
14
DAC LATCH CONTENTS
MSB
REFI
1111 1111 1111 1111
1000 0000 0000 0000
0000 0000 0000 0001
0000 0000 0000 0000
______________________________________________________________________________________
. The output buffers each drive a load of 2kΩ in
Applications Information
LDAC
OUT_
LSB
Bypassing Considerations
V
V
V
0
REF
REF
REF
Power-On Reset (POR)
ANALOG OUTPUT, V
x (65,535/65,536)
x (32,768/65,536) = 1/2 V
x (1/65,536)
Power Supplies and
Unipolar Output
Bipolar Output
t
LDACPWL
OUT
REF
t
S
Digital and AC transient signals on GND inputs can cre-
ate noise at the outputs. Connect both GND inputs to
form the star ground for the DAC system. Refer remote
DAC loads to this system ground for the best possible
performance. Use proper grounding techniques, such
as a multilayer board with a low-inductance ground
plane, or star connect all ground return paths back to
the MAX5134 GND. Carefully lay out the traces
between channels to reduce AC crosscoupling and
crosstalk. Do not use wire-wrapped boards and sock-
ets. Use shielding to improve noise immunity. Do not
run analog and digital signals parallel to one another
(especially clock signals) and avoid routing digital lines
underneath the MAX5134 package.
INL is the deviation of the measured transfer function
from a best fit straight line drawn between two codes.
This best fit line is a line drawn between codes 3072
and 64,512 of the transfer function, once offset and
gain errors have been nullified.
DNL is the difference between an actual step height
and the ideal value of 1 LSB. If the magnitude of the
DNL is greater than -1 LSB, the DAC guarantees no
missing codes and is monotonic.
Offset error indicates how well the actual transfer func-
tion matches the ideal transfer function at a single point.
Typically, the point at which the offset error is specified is
at or near the zero-scale point of the transfer function.
Differential Nonlinearity (DNL)
±2 LSB
Integral Nonlinearity (INL)
Layout Considerations
Definitions
Offset Error