SHA1134_15 Datasheet, PDF (1/4 Pages) Analog Devices – GENERAL PURPOSE SAMPLE AND HOLD AMPLIFIER

. ,. ANALOG
W DEVICES
GeneralPurpose
Sample-and-HoAldmplifier
PRELIMINARY TECHNICAL DATA
FEATURES
3.4tls Acquisition Time
Short 35ns Aperture Delay
:to.005% Maximum Linearity Error
High Input Impedance: >107Q
DTL/TTL Compatible
Compact Module: 1 1/8" x 2" x 0.4" (29 x 51 x 10mm)
OB _{GENERAL DESCRIPTION}
S The SHA1134 is a moderately fast, general purpose sample-
and-hold amplifier which has been optimized for use in data
O _{acquisition applications with lZ-bit analog-to-digital converters}
When in the "sample" mode, the module appears as a fast amp-
8 ^{L lifier with a 3.Ztls settling time to :to.O1% accuracy. When}
E _{switched to the "hold" mode, the output is held at a level}
corresponding to the input signal voltage at the instant of swit-
TE _{ching. The operating mode of the SHAll 34 is controlled by a}
When the mode control input is shifted to logic" 1", the switch
closes, causing the capacitor voltage and output voltage to
match the input voltage. In addition to providing input buffer-
ing, amplifier Al supplies the current needed to quickly char~
the storage capacitor in this mode of operation. The high gain
feedback loop contributes to high tracking accuracy.
When the mode control is shifted back to logic "0", the switch
opens and the output remains fixed at a voltage equal to the
voltage "stored" across the capacitor. The low input current of
TTL/DTL compatible logic input.
amplifier A2 and the low "off" leakage current of the field-
The SHA1l34 features an aperture delay time of 35ns and an
effect-transistor switch minimize the leakage of the capacitor's
aperture delay time uncertainty, or "jitter", of Zns. The droop charge and, thus, the "droop" in the output voltage. Amplifier
rate of 50mV/s makes it suitabl~ for operation with virtually all AZ provides the SHA1134 with low output impedance and good
successive approximation AID converters. Package size for this
compact module is LIZ" x Z" x 0.4" (Z9 x 51 x 10mm). It
current drive capabil ity.
needs no adjustments and requires only :t15V external power
for operation.
PRINCIPLE OF OPERATION
The SHAII34 consists basically of two high speed operational
amplifiers, a storage capacitor, and a digitally controlled switch
connected in a feedback loop as shown below.
~ ^{- A1}
I
MODE
I
"'""'NO~C'~0-- - - - - - - - -
+
A2
00,,","
Figure 1. SHA 1134 Basic Configuration
8
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