®
®
SHM-950
Miniature, High-Speed
±0.001% Sample-Hold Amplifiers
IN N O VAT IO N a n d E X C E L L E N C E
FEATURES
•
•
•
•
•
•
•
•
18-Bit accuracy
Small 8-pin DIP package
800ns max. acquisition time to ±0.001%
200ns max. sample-to-hold settling time to ±0.001%
16MHz small signal bandwidth
90dB feedthrough attenuation
±25 picoseconds aperture uncertainty
415mW maximum power dissipation
GENERAL DESCRIPTION
DATEL’s SHM-950 is a high-speed, highly accurate sample/
hold designed for precision, high-speed analog signal
processing applications. The SHM-950 features excellent
dynamic specifications including a maximum acquisition time
of only 800 nanoseconds for a 10V step to ±0.001%.
Sample-to-hold settling time, to ±0.001% accuracy, is 200
nanoseconds maximum with an aperture uncertainty of ±25
picoseconds.
The SHM-950 is a complete sample/hold circuit, containing a
precision MOS hold capacitor and a MOSFET switching
configuration which results in faster switching and better
feedthrough attenuation. Additionally, a FET input amplifier
design allows faster acquisition and settling times while
maintaining a considerably lower droop rate.
INPUT/OUTPUT CONNECTIONS
PIN
1
2
3
4
5
6
7
8
FUNCTION
+5V SUPPLY
S/H CONTROL
ANALOG INPUT
ANALOG RETURN
–15V SUPPLY
ANALOG OUTPUT
+15V SUPPLY
POWER GROUND
–15V
SUPPLY
5
+15V
SUPPLY
7
+5V
SUPPLY
1
2kΩ
100pF
2kΩ
ANALOG INPUT 3
6 ANALOG OUTPUT
S/H CONTROL 2
SWITCH
DRIVER
8
POWER
GROUND
4
ANALOG
RETURN
Figure 1. SHM-950 Functional Block Diagram
SHM-950
ABSOLUTE MAXIMUM RATINGS
±15V Supply Voltage
+5V Supply Voltage
Analog Input
Digital Input
Output Current
±18V
–0.5V to +7V
±18V
–0.5V to +5.5V
±65 mA
POWER REQUIREMENTS
Voltage Range
+15V Supply
–15V Supply
+5V Supply
Power Supply Rejection Ratio
Quiescent Current Drain
+15V Supply
–15V Supply
+5V Supply
Power Consumption
PHYSICAL/ENVIRONMENTAL
±10
±7
1.75
—
—
100
±11.5
±8.5
2
—
0.1
250
—
—
—
±40
—
—
Volts
Volts
kΩ
mA
Ω
pF
Operating Temp. Range, Case
SHM-950MC
SHM-950MM
Storage Temperature Range
Thermal Impedance
θjc
θca
Package Type
Footnotes:
MIN.
+11.5
–11.5
+4.75
—
—
—
—
—
®
®
TYP.
+15.0
–15.0
+5.0
±0.5
+8
–8
+1
365
MAX.
+15.5
–15.5
+5.25
±1
+13.5
–13.5
+1.5
415
UNITS
Volts
Volts
Volts
mV/V
mA
mA
mA
mW
FUNCTIONAL SPECIFICATIONS
(Apply over the operating temperature range with ±15V and +5V supplies
unless otherwise specified.)
ANALOG INPUT/OUTPUT
Input/Output Voltage Range
±15V Nominal Supplies
±12V Nominal Supplies
Input Impedance
Output Current
Output Impedance
Capacitive Load
DIGITAL INPUT
Input Logic Levels
Logic 1
Logic 0
Loading
Logic 1
Logic 0
TRANSFER CHARACTERISTICS
Gain
Gain Error,
+25°C
Linearity Error
Sample Mode Offset ,
+25°C
Sample-to-Hold Offset
(Pedestal),
+25°C
Gain Drift
Sample Mode Offset Drift
Sample-to-Hold Off.
(Pedestal) Drift
DYNAMIC CHARACTERISTICS
Acquisition Time
10V to ±0.001%FS (±0.1mV)
+25°C
–55 to +125°C
10V to ±0.1%FS (±10 mV)
+25°C
–55 to +125°C
10V to ±1%FS (±100 mV)
1V to ±1%FS (±10 mV)
Sample-to-Hold Settling Time
10V to ±0.01%FS (±1 mV)
10V to ±0.1%FS (±10 mV)
Sample-to-Hold Transient
Aperture Delay Time
Aperture Uncertainty (Jitter)
Output Slew Rate
Output Droop
+25°C
0 to +70°C
–55 to +125°C
Feedthrough Rejection
—
—
—
—
—
—
—
–1
±0.05
±0.001
±2
±2.5
±0.5
±3
—
±0.5
±0.005
±7
±25
±15
±15
V/V
%
%FS
mV
mV
ppm/°C
ppm of
FSR/°C
ppm of
FSR/°C
+2.0
0
—
—
—
—
—
—
+5.0
+0.8
+5
–5
Volts
Volts
µA
µA
MIN.
TYP.
MAX.
UNITS
0 to +70°C
–55 to +125°C
–65 to +150°C
15°C/W
35°C/W
8-pin ceramic DIP
Full Scale (FS) = 10V. Full Scale Range (FSR) = 20V.
Sample-to-hold offset error (pedestal) is constant regardless of input/output level.
ORDERING INFORMATION
MODEL
SHM-950MC
SHM-950MM
OPERATING TEMP. RANGE
0 to +70°C
–55 to +125°C
For availability of high-reliability versions of the SHM-950,
contact DATEL.
—
±5
±20
TECHNICAL NOTES
1. All ground pins should be tied together and connected to
system analog ground as close to the package as possible.
It is recommended to use a ground plane under the device
and solder ground pins directly to it. Take care to ensure
that no ground potentials can exist between ground pins.
2. External 0.1µF to 1µF tantalum bypass capacitors are
required in critical applications.
3. A logic 1 on S/H puts the unit in the sample mode. A logic 0
puts the unit in hold mode.
4. The maximum capacitive load to avoid oscillation is typically
250pF. Recommended resistive load is 500Ω, although
values as low as 250Ω may be used. Acquisition and
sample-to-hold settling times are relatively unaffected by
resistive loads down to 250Ω and capacitive loads up to
50pF. Greater load capacitances will affect both acquisition
and settling time.
5. Gain and offset adjusting can be accomplished using the
external circuitry shown in Figure 2. Adjust offset with a 0V
input. Adjust gain with a ±FS input. Adjust so that the output
in the hold mode matches the input.
—
—
—
—
—
—
—
—
—
—
—
±40
—
—
—
—
160
—
100
—
200
200
100
100
100
10
±25
60
±0.5
±15
±1.2
–84
800
900
400
450
—
—
150
120
—
15
±50
—
±15
±30
±2.4
–78
ns
ns
ns
ns
ns
ns
ns
ns
mVp-p
ns
ps
V/µs
µV/µs
µV/µs
mV/µs
dB
®
®
SHM-950
ANALOG
INPUT
(GAIN ADJUST)
R1
10kΩ, 0.1%
50Ω
10kΩ, 0.1%
TO SHM-950
PIN 3
HIGH-SPEED
FAST-SETTLING
AMPLIFIER
5.11kΩ
3MΩ
–15V
+15V
R2
(OFFSET ADJUST)
NOTE: With a precision source, adjust R1 and R2 so
that the output of the SHM-950 in the hold mode
matches the source output.
Figure 2. Offset and Gain Adjustments
MECHANICAL DIMENSIONS
INCHES (mm
)
0.405 MAX.
(10.287)
PIN 1
INDENTIFIER
SHM-49
SHM-950
0.300 MAX.
(7.62)
0.140 MAX.
(3.556)
0.09
(2.23)
0.035 ±0.010
(0.89)
Dimension Tolerances
(unless otherwise indicated):
2 place decimal (.XX) ±0.001 (±0.25)
3 place decimal (.XXX) ±0.005 (±0.127)
0.200 MAX.
(5.08)
0.054
(1.372)
0.018 ±0.002
(0.457)
0.100 TYP.
(2.540)
0.300 ±0.005
(7.620)
0.010 ±0.002
(0.254)
0.300 ±0.015
(7.620)
®
®
INNOVATION and EXCELLENCE
ISO 9001
Registered
DS-0484
07/2000
DATEL, Inc. 11 Cabot Boulevard, Mansfield, MA 02048-1151
Tel: (508) 339-3000 (800) 233-2765 Fax: (508) 339-6356
Internet: www.datel.com E-mail: sales@datel.com
DATEL (UK) LTD. Tadley, England Tel: (01256)-880444
DATEL S.A.R.L. Montigny Le Bretonneux, France Tel: 01-34-60-01-01
DATEL GmbH München, Germany Tel: 89-544334-0
DATEL KK Tokyo, Japan Tel: 3-3779-1031, Osaka Tel: 6-6354-2025
DATEL makes no representation that the use of its products in the circuits described herein, or the use of other technical information contained herein, will not infringe upon existing or future patent rights. The descriptions
contained herein do not imply the granting of licenses to make, use, or sell equipment constructed in accordance therewith. Specifications are subject to change without notice. The DATEL logo is a registered DATEL,
Inc. trademark.
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