HA-2425 데이터 시트보기 (PDF) - Harris Semiconductor
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HA-2425 Datasheet PDF : 9 Pages
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HA-2420, HA-2425
Glossary of Terms
Acquisition Time
The time required following a “sample” command, for the output
to reach its final value within ±0.1% or ±0.01%. This is the mini-
mum sample time required to obtain a given accuracy, and
includes switch delay time, slewing time and settling time.
Aperture Time
The time required for the sample-and-hold switch to open,
independent of delays through the switch driver and input
amplifier circuitry. The switch opening time is that interval
between the conditions of 10% open and 90% open.
Effective Aperture Delay Time (EADT)
The difference between the digital delay time from the Hold
command to the opening of the S/H switch, and the propaga-
tion time from the analog input to the switch.
EADT may be positive, negative or zero. If zero, the S/H ampli-
fier will output a voltage equal to VIN at the instant the Hold
command was received. For negative EADT, the output in Hold
(exclusive of pedestal and droop errors) will correspond to a
value of VIN that occurred before the Hold command.
Aperture Uncertainty
The range of variation in Effective Aperture Delay Time. Aper-
ture Uncertainty (also called Aperture Delay Uncertainty,
Aperture Time Jitter, etc.) sets a limit on the accuracy with
which a waveform can be reconstructed from sample data.
Drift Current
The net leakage current from the hold capacitor during the
hold mode. Drift current can be calculated from the droop
rate using the formula:
ID (pA) = CH (pF) × ∆--∆--V--t- (V ⁄ s )
Typical Performance Curves
1000
100
10
DRIFT DURING HOLD MIN. SAMPLE TIME
AT 25oC (mV/s)
FOR 0.1% ACCURACY
10V SWINGS (µs)
UNITY GAIN PHASE
MARGIN (DEGREES)
HOLD STEP
OFFSET
ERROR (mV)
1000
OUTPUT NOISE
“HOLD” MODE
100
EQUIV. INPUT NOISE
“SAMPLE” MODE - 100kΩ
SOURCE RESISTANCE
1.0
0.1
0.01
10pF
UNITY GAIN
BANDWIDTH
(MHz)
SLEW RATE
(V/µs)
100pF
1000pF 0.01µF
CH VALUE
0.1µF
1.0µF
FIGURE 10. TYPICAL SAMPLE AND HOLD PERFORMANCE AS
A FUNCTION OF HOLDING CAPACITOR
10
EQUIV. INPUT NOISE
“SAMPLE” MODE - 0Ω
SOURCE RESISTANCE
1
10
100
1K
10K
100K
1M
BANDWIDTH (LOWER 3dB FREQUENCY = 10Hz)
FIGURE 11. BROADBAND NOISE CHARACTERISTICS
1000
100
10
1
-50 -25
0
25
50
75
TEMPERATURE (oC)
100 125
FIGURE 12. DRIFT CURRENT vs TEMPERATURE
100
90
80
70
60
50
40
30
20
10
0
-10
-20
-30
10
CH = 100pF
CH = 1000pF
CH = 0.01µF
CH = 1.0µF
CH = 0.1µF
100
1K 10K 100K 1M
FREQUENCY (Hz)
10M 100M
FIGURE 13. OPEN LOOP FREQUENCY RESPONSE
5-8
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