HS-565ARH(1996) Просмотр технического описания (PDF) - Intersil
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HS-565ARH Datasheet PDF : 10 Pages
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HS-565ARH
respective change in temperature. The specification given is
the larger of the two, representing worst case drift.
Power Supply Sensitivity
Power Supply Sensitivity is a measure of the change in gain
and offset of the D/A converter resulting from a change in -15V
or +15V supplies. It is specified under DC conditions and
expressed as parts per million of full scale range per percent of
change in power supply (ppm of FSR/%).
Compliance
Compliance Voltage is the maximum output voltage range
that can be tolerated and still maintain its specified accuracy.
Compliance Limit implies functional operation only and
makes no claims to accuracy.
No Trim Operation
The HS-565ARH will perform as specified without calibration
adjustments. To operate without calibration, substitute 50Ω
resistors for the 100Ω trimming potentiometers: In Figure 3
replace R2 with 50Ω; also remove the network on pin 8 and
connect 50Ω to ground. For bipolar operation in Figure 4,
replace R3 and R4 with 50Ω resistors.
With these changes, performance is guaranteed as shown
under Specifications, “External Adjustments”. Typical
unipolar zero will be ±0.50 LSB plus the op amp offset.
The feedback capacitor C must be selected to minimize
settling time.
Glitch
A glitch on the output of a D/A converter is a transient spike
resulting from unequal internal ON-OFF switching times.
Worst case glitches usually occur at half scale or the major
carry code transition from 011 . . . 1 to 100 . . . 0 or vice
versa. For example, if turn ON is greater than turn OFF for
011 . . . 1 to 100 . . . 0, an intermediate state of 000 . . . 0
exists, such that, the output momentarily glitches toward
zero output. Matched switching times and fast switching will
reduce glitches considerably.
Applying the HS-565ARH
OP AMP Selection
The HS-565ARH’s current output may be converted to
voltage using the standard connections shown in Figures 3
and 4. The choice of operational amplifier should be
reviewed for each application, since a significant trade-off
may be made between speed and accuracy. Remember
settling time for the DAC-amplifier combination is
(tD)2 + (tA)2
where tD, tA are settling times for the DAC and amplifier.
R2
100Ω
REF OUT
VCC
43
BIP.
OFF.
8
+
-
6
REF
IN
REF 5
GND
19.95
K
HS-565ARH
10V
5K
IREF
0.5mA
9.95K
DAC
5K
3.5K +
-
3K
IO
(4 x IREF
x CODE) 2.5K
100kΩ
100Ω
+15V
R1
50kΩ
-15V
11
20V SPAN
10
10V SPAN VO
DAC
OUT
9
-
C
+
R (SEE
TABLE 7)
CODE
INPUT
7
-VEE
24 . . . . . 13
MSB LSB
PWR
GND
R4
100Ω
REF OUT
VCC
43
R3
100Ω
BIP.
OFF.
8
+
-
6 19.95K
REF
IN
5
REF
GND
HS-565ARH
10V
5K
IREF
0.5mA
9.95K
DAC
5K
+
3.5K
-
3K
IO
(4 x IREF
x CODE) 2.5K
CODE
INPUT
11
20V SPAN
10
10V SPAN VO
DAC
OUT
9
-
C
+
R (SEE
TABLE 7)
7
-VEE
24 . . . . . 13
MSB LSB
PWR
GND
FIGURE 4. BIPOLAR VOLTAGE OUTPUT
Calibration
Calibration provides the maximum accuracy from a
converter by adjusting its gain and offset errors to zero, For
the HS-565ARH, these adjustments are similar whether the
current output is used, or whether an external op amp is
added to convert this current to a voltage. Refer to Table 7
for the voltage output case, along with Figure 3 or 4.
Calibration is a two step process for each of the five output
ranges shown in Table 7. First adjust the negative full scale
(zero for unipolar ranges). This is an offset adjust which
translates the output characteristic, i.e. affects each code by
the same amount.
Next adjust positive FS. This is a gain error adjustment,
which rotates the output characteristic about the negative FS
value.
For the bipolar ranges, this approach leaves an error at the
zero code, whose maximum values is the same as for
integral nonlinearity error. In general, only two values of
output may be calibrated exactly; all others must tolerate
some error. Choosing the extreme end points (plus and
minus full scale) minimizes this distributed error for all other
codes.
FIGURE 3. UNIPOLAR VOLTAGE OUTPUT
Spec Number 518795
7
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