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参数资料
| 型号： | 08P-RIZ-K2GG-S3RL(LF)(SN) |
| 厂商： | J S T MFG CO LTD |
| 元件分类： | 电源输入模块 |
| 英文描述： | 11 CONTACT(S), FEMALE, POWER CONNECTOR, CRIMP, PLUG |
| 封装： | ROHS COMPLIANT |
| 文件页数： | 4/4页 |
| 文件大小： | 203K |
| 代理商： | 08P-RIZ-K2GG-S3RL(LF)(SN) |
4
Calibration
Calibration provides the maximum accuracy from a
converter by adjusting its gain and offset errors to zero, For
the HS-565ARH-T, 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 1 or 2.
Calibration is a two step process for each of the ve output
ranges shown in Table 1. 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.
Settling Time
This is a challenging measurement, in which the result
depends on the method chosen, the precision and quality of
test equipment and the operating conguration of the DAC
(test conditions). As a result, the different techniques in use
by converter manufacturers can lead to consistently different
results. An engineer should understand the advantage and
limitations of a given test method before using the specied
settling time as a basis for design.
The approach used for several years at Intersil calls for a
strobed comparator to sense nal perturbations of the DAC
output waveform. This gives the LSB a reasonable
magnitude (814mV for the HS-565ARH-T, which provides
the comparator with enough overdrive to establish an
accurate
±0.50 LSB window about the nal settled value.
Also, the required test conditions simulate the DACs
environment for a common application - use in a successive
approximation A/D converter. Considerable experience has
shown this to be a reliable and repeatable way to measure
settling time.
The usual specication is based on a 10V step, produced by
simultaneously switching all bits from off-to-on (tON) or on-
to-off (tOFF). The slower of the two cases is specied, as
measured from 50% of the digital input transition to the nal
entry within a window of
±0.50 LSB about the settled value.
Four measurements characterize a given type of DAC:
(Cases (b) and (c) may be eliminated unless the overshoot
exceeds 0.50 LSB). For example, refer to Figures 3A and 3B
for the measurement of case (d).
Procedure
As shown in Figure 3B, settling time equals tX plus the
comparator delay (tD = 15ns). To measure tX:
Adjust the delay on generator number 2 for a tX of several
microseconds. This assures that the DAC output has
settled to its nal wave
Switch on the LSB (+5V)
Adjust the VLSB supply for 50% triggering at
COMPARATOR OUT. This is indicated by traces of equal
brightness on the oscilloscope display as shown in Figure
3B. Note DVM reading
Switch to LSB to Pulse (P)
Readjust the VLSB supply for 50% triggering as before,
and note DVM reading. One LSB equals one tenth the
difference in the DVM readings noted above
Adjust the VLSB supply to reduce the DVM reading by 5
LSBs (DVM reads 10X, so this sets the comparator to
sense the nal settled value minus 0.50 LSB). Comparator
output disappears
Reduce generator number 2 delay until comparator output
reappears, and adjust for “equal brightness”
Measure tX from scope as shown in Figure 3B. Settling
time equals tX + tD, i.e., tX + 15ns
(a) tON, to final value +0.50 LSB
(b) tON, to final value -0.50 LSB
(c) tOFF, to final value +0.50 LSB
(d) OFF, to final value -0.50 LSB
TABLE 1. OPERATING MODES AND CALIBRATION
MODE
CIRCUIT CONNECTIONS
CALIBRATION
OUTPUT
RANGE
PIN 10
TO
PIN 11
TO
RESISTOR
(R)
APPLY
INPUT CODE
ADJUST
TO SET VO
Unipolar (See Figure 1)
0 to +10V
VO
Pin 10
1.43K
All 0’s
All 1’s
R1
R2
0V
+9.99756V
0 to +5V
VO
Pin 9
1.1K
All 0’s
All 1’s
R1
R2
0V
+4.99878V
HS-565ARH-T
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