POWER SUPPLY SENSITIVITY
less. The 3.9MΩ and 270kΩ resistors (±20% carbon or
better) should be located close to the D/A converter to
prevent noise pickup. If it is not convenient to use these
high-value resistors, an equivalent “T” network, as shown in
Figure 3, may be substituted in place of the 3.9MΩ part. A
0.001µF to 0.01µF ceramic capacitor should be connected
from Gain Adjust to Common to prevent noise pickup. Refer
to Figures 4 and 5 for the relationship of zero and gain
adjustments to unipolar and bipolar D/A converters.
Power supply sensitivity is a measure of the effect of a
change in a power supply voltage on the D/A converter
output. It is defined as a percent of FSR change in the output
per percent of change in either the positive supply (+VCC),
negative supply (–VCC) or logic supply (VDD) about the
nominal power supply voltages (see Figure 2).
It is specified for DC or low frequency changes. The typical
performance curve in Figure 2 shows the effect of high
frequency changes in power supply voltages.
≡
0.030
0.025
0.020
3.9MΩ
180kΩ
180kΩ
10kΩ
FIGURE 3. Equivalent Resistances.
0.015
–15V Supply
0.01
+5V
+15V
Supply
Supply
+ Full
Scale
0.005
0
Gain Adjust
Rotates
the Line
1LSB
1
10
100
1k
10k
100k
Range
of Gain
Adjust
Power Supply Ripple Frequency (Hz)
FIGURE 2. Power Supply Rejection vs Power Supply Ripple
Frequency.
Input =
FFFFH
Range of
Zero Adjust
Input =
0000 H
REFERENCE SUPPLY
Zero Adjust
Translates
the Line
All models have an internal low-noise +6.3V reference
voltage derived from an on-chip buried zener diode. This
reference voltage, available to the user, has a tolerance of
±5% (KH models) and ±1% (BH models). A minimum of
1.5mA is available for external loads. Since the output
impedance of the reference output is typically 1W, the
external load should remain constant.
Digital Input
FIGURE 4. Relationship of Zero and Gain Adjustments for
Unipolar D/A Converters, DAC701.
1LSB
If a varying load is to be driven by the reference supply, an
external buffer amplifier is recommended to drive the load
in order to isolate the bipolar offset (connected internally to
the reference) from load variations.
Range
+ Full
of Gain
Scale
Adjust
Offset
Adjust
Translates
the Line
Gain
Adjust
Rotates
the Line
Input =
FFFFH
OPERATING INSTRUCTIONS
Range
and
POWER SUPPLY CONNECTIONS
Offset
Adjust
For optimum performance and noise rejection, power sup-
ply decoupling capacitors should be added as shown in the
Connection Diagram. 1µF tantalum capacitors should be
located close to the D/A converter.
Input =
0000 H
MSB on All
Others Off 7FFFH
EXTERNAL ZERO AND GAIN ADJUSTMENT
– Full
Scale
Digital Input
Zero and gain may be trimmed by installing external zero
and gain potentiometers. Connect these potentiometers as
shown in the Connection Diagram and adjust as described
below. TCR of the potentiometers should be 100ppm/°C or
FIGURE 5. Relationship of Zero and Gain Adjustments for
Bipolar D/A Converters, DAC702 and DAC703.
®
7
DAC701, 702, 703
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