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参数资料
| 型号： | HI-565 |
| 厂商： | Intersil Corporation |
| 英文描述： | CIRCUIT BREAKER |
| 中文描述： | 高速，单片的D / A转换器与参考 |
| 文件页数： | 6/9页 |
| 文件大小： | 303K |
| 代理商： | HI-565 |
6
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 configuration 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 specified
settling time as a basis for design.
The previous approach calls for a strobed comparator to
sense final perturbations of the DAC output waveform. This
gives the LSB a reasonable magnitude (814
μ
V for the
HI-565A), which provides the comparator with enough
overdrive to establish an accurate
±
0.5 LSB window about the
final 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 specification is based on a 10V step, produced by
simultaneously switching all bits from off-to-on (t
ON
) or on-
to-off (t
OFF
). The slower of the two cases is specified, as
measured from 50% of the digital input transition to the final
entry within a window of
±
0.5 LSB about the settled value.
Four measurements characterize a given type of DAC:
(a)
t
ON
, to final value +0.5 LSB
(b)
t
ON
, to final value -0.5 LSB
(c)
t
OFF
, to final value +0.5 LSB
(d)
t
OFF
, to final value -0.5 LSB
(Cases (b) and (c) may be eliminated unless the overshoot
exceeds 0.5 LSB). For example, refer to Figure 3 for the
measurement of case (d).
Procedure
As shown in Figure 3B, settling time equals t
X
plus the
comparator delay (t
D
= 15ns). To measure t
X
:
Adjust the delay on generator No. 2 for a t
X
of several
microseconds. This assures that the DAC output has
settled to its final value.
Switch on the LSB (+5V).
Adjust the V
LSB
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 the LSB to Pulse (P).
Readjust the V
LSB
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 V
LSB
supply to reduce the DVM reading by 5
LSBs (DVM reads 10X, so this sets the comparator to
sense the final settled value minus 0.5 LSB).
Comparator output disappears.
Reduce generator No. 2 delay until comparator output
reappears, and adjust for “equal brightness”.
Measure t
X
from scope as shown in Figure 3B. Settling
time equals t
X
+ t
D
, i.e., t
X
+ 15ns.
REF OUT
x CODE)
(4 x IREF
IO
3.5K
3K
CODE
INPUT
DAC
2.5K
5K
9
DAC
OUT
C
9.95K
5K
10
11
20V SPAN
10V SPAN
VO
R
(SEE
TABLE 2)
0.5mA
IREF
HI-565A
19.95K
+
-
4
3
6
5
8
BIP.
OFF.
VCC
7
12
24
13
MSB
LSB
REF
GND
REF
IN
100
10V
-V
EE
PWR
GND
R4
100
R3
+
-
+
-
FIGURE 2. BIPOLAR VOLTAGE OUTPUT
HI-565A
相关PDF资料 |
PDF描述 |
|---|---|
| HI1-565ATD-2 | High Speed, Monolithic D/A Converter with Reference |
| HI1-565ASD-2 | High Speed, Monolithic D/A Converter with Reference |
| HI-565A | 64 MACROCELL 3.3 VOLT ISP CPLD - NOT RECOMMENDED for NEW DESIGN |
| HI1-565AJD-5 | High Speed, Monolithic D/A Converter with Reference |
| HI1-565AKD-5 | High Speed, Monolithic D/A Converter with Reference |
相关代理商/技术参数 |
参数描述 |
|---|---|
| HI-565A | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:High Speed, Monolithic D/A Converter with Reference |
| HI-565A/883 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:High Speed. Monolithic D/A Converter with Reference |
| HI-565A_02 | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:High Speed, Monolithic D/A Converter with Reference |
| HI5660 | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:8-Bit, 165/125/60MSPS, High Speed D/A Converter |
| HI5660/16IA | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:8-Bit, 165/125/60MSPS, High Speed D/A Converter |
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