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HA-5330 Datasheet(PDF) 4 Page - Intersil Corporation

Part No. HA-5330
Description  650ns Precision Sample and Hold Amplifier
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Maker  INTERSIL [Intersil Corporation]
Homepage  http://www.intersil.com/cda/home
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HA-5330 Datasheet(HTML) 4 Page - Intersil Corporation

   
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Application Information
The HA-5330 has the uncommitted differential inputs of an
op amp, allowing the Sample/Hold function to be combined
with many conventional op amp circuit ideas. See the Intersil
Application Note AN517 for a collection of circuit ideas.
Layout
A printed circuit board with ground plane is recommended
for best performance. Bypass capacitors (0.01
µF to 0.1µF,
ceramic) should be provided from each power supply
terminal to the Supply GND Terminal on pin 11.
Typical Applications
The HA-5330 is configured as a unity gain noninverting
amplifier by simply connecting the output (pin 7) to the
inverting input (pin 14). As an input device for a fast
successive - approximation A/D converter, it offers an
extremely high throughput rate. Also, the HA-5330’s
pedestal error is adjustable to zero by using an Offset Adjust
potentiometer (10K to 50K) center tapped to V-.
The ideal ground connections are pin 11 (Supply Ground)
directly to the system Supply Common, and pin 12 (Signal
Ground) directly to the system Signal Ground (Analog
Ground).
Hold Capacitor
The HA-5330 includes a 90pF MOS hold capacitor, sufficient
for most high speed applications (the Electrical
Specifications section is based on the internal capacitor).
Output Stage
The HA-5330 output circuit does not include short circuit
protection, and consequently its output impedance remains
low at high frequencies. Thus, the step changes in load
current which occur during an A/D conversion are absorbed
at the S/H output with minimum voltage error. A momentary
short circuit to ground is permissible, but the output is not
designed to tolerate a short of indefinite duration.
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 minimum 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.
Hold Step Error
Hold step error is the output shift due to charge transfer from
the sample to the hold mode. It is also referred to as “offset
step” or “pedestal error”.
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
propagation time from the analog input to the switch.
EADT may be positive, negative or zero. If zero, the S/H
amplifier 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.
Aperture 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.
3
4
10k
Ω - 50kΩ
V-
FIGURE 1. HA-5330 OFFSET ADJUST
40
20
0
-20
-40
1K
10K
100K
1M
10M
FREQUENCY (Hz)
MAGNITUDE
PHASE
±15V SUPPLIES
±12V SUPPLIES
180
90
0
FIGURE 2. MAGNITUDE AND PHASE RESPONSE
(CLOSED LOOP GAIN = 100)
20
40
60
80
100
3.0
2.0
1.0
0.0
-1.0
-2.0
RISE TIME (ns) 0V TO 3.5V
FIGURE 3. HOLD STEP ERROR vs S/H CONTROL RISE TIME
HA-5330


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