HA4P2425-5 Intersil Corporation, HA4P2425-5 Datasheet - Page 6

• Manufacturer Part Number: HA4P2425-5
• Description: 3.2s Sample and Hold Amplifiers
• Manufacturer: Intersil Corporation

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.
Typical Performance Curves
FIGURE 10. TYPICAL SAMPLE AND HOLD PERFORMANCE AS
1000
0.01
100
1.0
0.1
1000
10
100
10
10pF
1
FIGURE 12. DRIFT CURRENT vs TEMPERATURE
-50
DRIFT DURING HOLD
AT 25
A FUNCTION OF HOLDING CAPACITOR
BANDWIDTH
UNITY GAIN
100pF
-25
o
C (mV/s)
(MHz)
MARGIN (DEGREES)
UNITY GAIN PHASE
0
1000pF
TEMPERATURE (
C
H
25
FOR 0.1% ACCURACY
VALUE
SLEW RATE
MIN. SAMPLE TIME
10V SWINGS ( s)
0.01 F
50
(V/ s)
o
C)
75
0.1 F
HOLD STEP
OFFSET
ERROR (mV)
100
HA-2420, HA-2425
1.0 F
125
5-6
EADT may be positive, negative or zero. If zero, the S/H ampli-
fier will output a voltage equal to V
command was received. For negative EADT, the output in Hold
(exclusive of pedestal and droop errors) will correspond to a
value of V
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:
I
D
1000
(pA)
100
100
10
-10
-20
-30
FIGURE 11. BROADBAND NOISE CHARACTERISTICS
90
80
70
60
50
40
30
20
10
1
0
10
FIGURE 13. OPEN LOOP FREQUENCY RESPONSE
10
=
OUTPUT NOISE
“HOLD” MODE
IN
C
H
that occurred before the Hold command.
C
C
BANDWIDTH (LOWER 3dB FREQUENCY = 10Hz)
100
H
H
(pF)
= 1.0 F
= 0.1 F
100
------- - (V s
V
1K
t
FREQUENCY (Hz)
1K
10K
100K
C
C
C
EQUIV. INPUT NOISE
“SAMPLE” MODE - 100k
SOURCE RESISTANCE
IN
H
H
H
10K
= 100pF
= 1000pF
= 0.01 F
EQUIV. INPUT NOISE
“SAMPLE” MODE - 0
SOURCE RESISTANCE
at the instant the Hold
1M
100K
10M
100M
1M