FEATURES
••
••
•200ns Maximum acquisition time
••
••
•±0.01% Accuracy
••
••
•100ns Maximum sample-hold settling time
••
••
•74dB Feedthrough attenuation
••
••
•±50ps Aperture uncertainty
••
••
•Industry standard
GENERAL DESCRIPTION
DATEL’s SHM-4860 is a high-speed, highly accurate sample-
hold amplifier designed for precision, high-speed analog signal
processing applications. Manufactured using modern, high-
quality hybrid technology, the SHM-4860 features excellent
dynamic specifications including a maximum acquisition time of
only 200ns for a 10V step to ±0.01%. Sample-to-hold settling
time, to ±0.01% accuracy, is 100ns maximum with an aperture
uncertainty of ±50ps.
The SHM-4860 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.
Figure 1. Functional Block Diagram
D ATEL, Inc., 1 1 Cabot Boulevard, Mansfield, MA 02048-1194 (U.S.A.) Tel: 508-339-3000 Fax: 508-339-6356 • For immediate assistance 800-233-2765
PIN FUNCTION PIN FUNCTION
1 OUTPUT 24 +15V SUPPL Y
2 N.C. 23 GROUND
3 N.C. 22 –15V SUPPL Y
4 N.C. 21 GROUND
5 N.C. 20 N.C.
6 N.C. 19 N.C.
7 N.C. 18 N.C.
8 N.C. 17 N.C.
9 +5V SUPPL Y 16 N.C.
10 GROUND 15 GROUND
11 HOLD COMMAND 14 N.C.
12 HOLD COMMAND 13 INPUT
INPUT/OUTPUT CONNECTIONS
INNOVATION and EX C ELL E N C E
®®
SHM-4860
Industry-Standard, High-Speed
±0.01% Sample-Hold Amplifiers
+
10 15 21 23 INTERNAL
SUPPLY BYPASS
CAPACITORS
9 +5V SUPPLY
24 +15V SUPPL
Y
22 –15V SUPPLY
1 OUTPUT
C
H
1k
INPU T 13
HOLD COMMAND 11
HOLD COMMAND 12 SWITCH
DRIVER
SYSTEM GROUND
1k
Sample-and-Hold Amplifiers
SHM-4860
®
®
PHYSICAL/ENVIRONMENTAL
Operating T emperature Ranges
SHM-4860MC 0 to +70°C (ambient)
SHM-4860MM, 883 –55 to +125°C (case)
Storage T emperature Range –65 to +150°C
Package Type 24-pin ceramic DDIP
Footnotes:
➀
Input signal should not exceed the supply voltage.
➁
The SHM-4860’s output is current limited at approximately ±65mA. The device
can withstand a sustained short to ground. However, shor ts from the output to
either supply will cause permanent damage. For normal operation, the load
current should not exceed ±40mA.
➂
Full Scale (FS) = 10V. Full Scale Range (FSR) = 20V.
➃
Sample-to-Hold Offset Error (Pedestal) is constant regardless of input/output
level.
➄
Units are ppm of FSR/°C.
ABSOLUTE MAXIMUM RATINGS
±15V Supply Voltag es, Pins 24, 22 ±18V
+5V Supply Voltage, Pin 9 –0.5V to +7V
Analog Input, Pin 13
➀
±18V
Digital Inputs, Pins 11, 12 –0.5V to +7V
Output Current
➁
±65mA
FUNCTIONAL SPECIFICATIONS
(Typical at +25°C with ±15V and +5V supplies unless otherwise noted.)
ANALOG INPUT/OUTPUT MIN. TYP. MAX. UNITS
Input/Output Voltage Range
➀
±10.25 ±11.25 — V
Input Impedance —1—k
Ω
Output Current
➁
— — ±40 mA
Output Impedance 0.1 — k
Ω
Maximum Capacitive Load — 250 — pF
DIGIT AL INPUT
Input Logic Level
Logic "1" +2.0 — +5.0 V
Logic "0" 0 — +0.8 V
Loading
Logic "1" — — +40 µA
Logic "0" — — –1.6 mA
TRANSFER CHARACTERISTICS
Gain — –1 — V/V
Gain Accuracy — ±0.05 ±0.1 %
Gain Linearity Error
➂
— ±0.005 ±0.01 %FS
Sample-Mode Offset Voltage — ±0.5 ±5 mV
Sample-to-Hold Offset Error
➃
(Pedestal) — ±2.5 ±20 mV
Gain T empco (Dr ift) — ±0.5 ±5 ppm/°C
Sample-Mode Offset Drift — ±3 ±15
➄
Sample-to-Hold Offset Drift —±4—
➄
DYNAMIC CHARACTERISTICS
Acquisition Time
10V to ±0.01%FS — 160 200 ns
10V to ±0.1%FS — 100 170 ns
10V to ±1%FS — 90 — ns
1V to ±1%FS — 75 — ns
Sample-to-Hold Settling Time
10V to ±0.01%FS — 60 100 ns
10V to ±0.1%FS — 40 — ns
Sample-to-Hold Transient — 180 — mV p-p
Aperture Delay Time —6—ns
Aperture Uncer tainty (Jitter) — ±50 — ps
Output Slew Rate — ±300 —
µ
V/
µ
s
Small Signal Bandwidth (–3dB) — 16 — MHz
Droop: +25°C — ±0.5 ±5
µ
V/
µ
s
+70°C — ±15 —
µ
V/
µ
s
+125°C — ±1.2 — mV/
µ
s
Feedthrough Attenuation —74—dB
Overload Recovery Time
Positive — 200 — ns
Negative — 700 — ns
POWER REQUIREMENTS
Voltag e Range: ±15V Supplies — ±3 — %
+5V Supply — ±5 — %
Power Supply Rejection Ratio — ±0.5 — mV/V
Quiescent Current Drain
+15V Supply — +21 +25 mA
–15V Supply — –22 –25 mA
+5V Supply — +17 +25 mA
Power Consumption — 730 875 mW
TECHNICAL NOTES
1. All ground pins (10, 15, 21, 23) 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 all four ground pins directly to
it. Care must be taken to ensure that no ground potentials
can exist between Pin 10 and the other ground pins.
2. Although the power supply pins (9, 22, 24) are internally
bypassed to ground with 0.01µF ceramic capacitors,
additional external 0.1µF to 1µF tantalum bypass
capacitors may be required in critical applications.
3. A logic "0" on the HOLD COMMAND input (Pin 11), or a
logic "1" on the HOLD COMMAND input (Pin 12), will put
the device in the sample mode. In this mode, the device
acts as an inverting unity-gain amplifier, and its output will
track its input. A logic "1" on Pin 11 (logic "0" on Pin 12)
will put the device in the hold mode, and the output will be
held constant at the last input level present when the hold
command was given.
If the HOLD COMMAND input (Pin 11) is used to control the
device, Pin 12 must be tied to digital ground. If HOLD
COMMAND input (Pin 12) is used to control the device, Pin
11 must be tied to +5V.
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. However, higher capacitances will affect both
acquisition and settling time.
SHM-4860
®
®
ORDERING INFORMATION
MODEL NUMBER OPERA TING TEMP. RANGE
SHM-4860MC 0 to +70°C
SHM-4860MM –55 to +125°C
SHM-4860/883 –55 to +125°C
Contact DA TEL for 883 product specifications.
MECHANICAL DIMENSIONS
INCHES (mm)
0.200 MAX.
(5.080)
0.235 MAX.
(5.969)
0.600 ±0.010
(15.240)
0.80 MAX.
(20.32)
0.100 TYP.
(2.540)
0.100
(2.540)
0.018 ±0.002
(0.457)
0.100
(2.540)
0.040
(1.016)
1.31 MAX.
(33.27)
112
13
24
1.100
(27.940)
0.190 MAX.
(4.826)
0.010
(0.254)
+0.002
–0.001
SEATING
PLANE
0.025
(
0.635
)
Dimension Tolerances
(unless otherwise indicated):
2 place decimal (.XX) ±0.010 (±0.254)
3 place decimal (.XXX) ±0.005 (±0.127)
Lead Material:
Kovar alloy
Lead Finish:
50 microinches (minimum ) gold plating
over 100 microinches (nominal) nickel plating
24-PIN DDIP
DA TEL, Inc. 1 1 Cabot Boulevard, Mansfield, MA 02048-1 151
Tel: (508) 339-3000 (800) 233-2765 Fax: (508) 339-6356
Internet: www .datel.com Email: 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.
DS-0088A 1996
