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Application Note 9652
Board Adjustments and Settings
1.
2.
3.
4.
5.
6.
VRB.R1:
VRT.R2:
OFFSET.R3:
FULL SCALE.R4:
FULL SCALE.R5:
S1:
HI3026, VRB voltage adjusting volume.
HI3026, VRT voltage adjusting volume.
Adjusting volume for matching the AMP.IN input and DIR.IN input signal ranges to the
HI3026, input range.
Full-scale adjusting volume for the port 1 D/A output. (-1V: Typ.)
Full-scale adjusting volume for the port 2 D/A output. (-1V: Typ.)
Switching junction for the dual analog input pins.
Set as follows according to the input pins used.
JUNCTION
SYMBOL
AMP.IN
DIR.IN
A
OPEN
0.1 μ F
B
SHORT
10k ?
7.
8.
9.
10.
S2:
SW1 SELECT:
SW2 A/D INV:
SW# D/A INV:
Setting junction for the clock frequency division ratio. The operating speed after latching is
determined by the frequency division ratio set here.
When set to CLK OUT, it operates according to the HI3026, clock output.
HI3026, output mode selector switch.
HI3026, output polarity inversion switch.
D/A converter output polarity inversion switch.
Notes on Board Operation
1.
The factory settings for the HI3026, Evaluation Board
are as follows:
3.
When the analog input signal is a sine wave or other
repeating waveform, the signal can be input form the
CON2 (DIR.IN) pin with AC coupling. In these cases,
VRB.R1 = 1.5V
VRT.R2 = 3.0V
OFFSET.R3 = 2.25V
FULL SCALE.R4 = -1V S1 A···OPEN,
B ···SHORT
FULL SCALE.R5 = -1V S2 8···SHORT
(1/8 frequency
division)
4.
the input dynamic range is not limited by the +AMP and
-AMP supply voltages, but the VRT level may be limited
by IC3:NJM3403A. Therefore, the power supply for the
operational amplifier should be shifted in the same
manner as in 2. above.
In the evaluation board of the HI3026, CLC404 (Comlin-
2.
When using the board in this condition, the input signals
should be input at the amplitudes shown below.
(The frequency is set as desired.)
When the analog signal is input from the CON1
(AMP.IN) pin, IC2:CLC404 limits the input dynamic
range of the A/D converter’s analog input signal accord-
ing to the +AMP and -AMP supply voltages. The power
supply for the operational amplifier can also be shifted
to +AMP = +7.0V and -AMP = -3.0V to allow use with a
wider input dynamic range.
ANALOG INPUT SIGNAL: CON1 (AMP.IN)
CLOCK INPUT SIGNAL: CON3 (CLK.IN)
5
ear) is employed for IC2 to drive the analog input signal.
Though, CLC505 (Comlinear) can also be used instead
of CLC404, there should be little change in the periph-
eral circuit in this case.
0V CENTER, 800mV P-P OR LESS
0V CENTER, 1.0V P-P
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