IN N O VA T IO N a n d E X C E L L E N C E

SHM-14

Ultra-Fast, 14-Bit Linear

Monolithic Sample-Hold Amplifiers

Figure 1. SHM-14 Functional Block Diagram

1, 5, 8

ANALOG
OUTPUT

ANALOG INPUT

SAMPLE/HOLD

SWITCH

DRIVE

10, 11, 14

GROUND

EXTERNAL HOLD

CAPACITOR

5V SUPPLY

+5V SUPPLY

SAMPLE/HOLD

15pF

2, 4, 6, 7

DO NOT CONNECT

Note: SOIC Package Pinouts Shown

FEATURES

Fast acquisition time:

10ns to ±0.1%
20ns to ±0.024%
25ns to ±0.012%

±0.0012% Nonlinearity

65µV rms output noise

250MHz small signal bandwidth

70MHz full power bandwidth

80dB feedthrough

1ps Aperture jitter

250mW power dissipation

Low cost

GENERAL DESCRIPTION

The SHM-14 is an extremely high-speed and accurate
monolithic sample-and-hold amplifier designed for fast data
acquisition applications. The SHM-14 is accurate (±0.5 LSB to
14-bits over the full military temperature range) and is very fast
(10ns and 20ns acquisition times to accuracies of 10 and 12
bits respectively). With this high performance and a full power
bandwidth of 70MHz, the SHM-14 is an ideal device for driving
flash and high-resolution subranging A/D converters.

A careful design optimizes the device for accuracy and speed
over the full military temperature range. The droop rate is a low
±2mV/µs and can be further reduced by adding an optional
external hold capacitor. The 30mA output current and
guaranteed specifications for a 100

load provide high drive

capability. Operating from ± 5V supplies, the SHM-14
consumes only 250mW of power.

The SHM-14 is built using a fast complementary bipolar
process. The device is available in both military and industrial
temperature ranges. The SHM-14 is packaged in a 16-pin
plastic SOIC or in a 20-pin ceramic LCC.

NOT CONNECTED

5V SUPPLY

NOT CONNECTED

ANALOG INPUT

NOT CONNECTED

DO NOT CONNECT

5V SUPPLY

DO NOT CONNECT

5V SUPPLY

NOT CONNECTED

SAMPLE/HOLD

+5V SUPPLY

NOT CONNECTED

EXT. CAPACITOR

GROUND

+5V SUPPLY

ANALOG OUTPUT

PIN

FUNCTION

PIN

FUNCTION

INPUT/OUTPUT CONNECTIONS -- CLCC

SAMPLE/HOLD

+5V SUPPLY

EXT. CAPACITOR

GROUND

+5V SUPPLY

ANALOG OUTPUT

5V SUPPLY

DO NOT CONNECT

ANALOG INPUT

DO NOT CONNECT

5V SUPPLY

DO NOT CONNECT

5V SUPPLY

PIN

FUNCTION

PIN

FUNCTION

INPUT/OUTPUT CONNECTIONS -- SOIC

DATEL, Inc., 11 Cabot Boulevard, Mansfield, MA 02048-1151 (U.S.A.)

Tel: (508) 339-3000 Fax: (508) 339-6356

For immediate assistance (800) 233-2765

SHM-14

INPUTS

MIN.

TYP.

MAX.

UNITS

Input Voltage Range

2.5

+2.5

Volts

Input Impedance

0.3

Digitals Inputs (Balanced ECL)
Logic Levels

Logic 1

1.5

+1.8

Volts

Logic 0

2.5

+0.8

Volts

Logic Loading

Logic 1

+10

+50

µA

Logic 0

150

µA

Output Voltage Range

2.5

+2.5

Volts

Output Current

± 30

Output Impedance (dc)

0.3

Stable Capacitive Load

Nonlinearity (±1V)

+25°C

±0.0012

40 to +85°C

±0.002

55 to +125°C

±0.003

Sample Mode Offset

+25°C

±12

40 to +85°C

±20

55 to +125°C

±30

Pedestal

+25°C

±3

40 to +85°C

±20

55 to +125°C

±20

Gain, +25°C

+0.98

+0.995

V/V

Gain Drift (±1V)

40 to +85°C

±20

ppm/°C

55 to +125°C

±30

ppm/°C

Aperture Delay

40 to +85°C

55 to +125°C

Aperture Jitter

40 to +85°C

ps rms

55 to +125°C

ps rms

Harmonic Distortion (±1V)

dc to 1MHz

dc to 10MHz

+25°C

40 to +85°C

55 to +125°C

Acquisition Time (±0.012%, ±2V)

40 to +85°C

55 to +125°C

Acquisition Time (±0.024%, ±2V)

40 to +85°C

55 to +125°C

Acquisition Time (±0.05%, ±2V)

40 to +85°C

55 to +125°C

ABSOLUTE MAXIMUM RATINGS

PARAMETERS

LIMITS

UNITS

+5V Supply

0 to +6

Volts

5V Supply

0 to 6

Volts

Analog Input

+5V Supply 1

Volts

5V Supply +1

Volts

Continuous Output Current

±50

Digital Inputs

<Supply Voltages

Volts

Junction Temperature

+175

°C

Lead Temperature (10 seconds)

+300

°C

Output shorted to any supply will cause permanent damage.

OUTPUTS

PERFORMANCE

FUNCTIONAL SPECIFICATIONS

(Apply over the operating temperature range using a 100

resistive load, 10pF

capacitive load, ECL digital input levels, and ±5V nominal supplies, unless specified.)

TECHNICAL NOTES

The SHM-14 employs an open loop architecture in order to
achieve its superior high-speed characteristics. The first stage
buffer amplifier, which charges the hold capacitor, incorporates the
sample-and-hold switch into its design. This technique allows for a
fast acquisition time which is not limited by slew current like the
traditional Schottky diode bridge switch. The output amplifier uses
a closed loop voltage feedback design which provides a low (0.3

typical) output impedance. Gain and linearity are not affected by
heavy loads.

The design has been optimized to achieve the high accuracy associ-
ated with fast transient responses over the full military temperature
range. During the track-to-hold transient, the integral nonlinearity is
not affected and the pedestal remains constant over the full ±2.5V
input range.

An external hold capacitor can be added to the 15pF internal hold
capacitor to obtain a lower droop rate (the droop rate is propor-
tional to the inverse of the total hold capacitor value) without
increasing transient response times by more than few ns. Settling
and acquisition times are typically increased by 5ns and 10ns
respectively for 47pF and 100pF external hold capacitors. The
external hold capacitor should not exceed 100pF.

Acquisition Time (±0.1%, ±2V)

40 to +85°C

55 to +125°C

Hold Mode Settling (±0.012%)

40 to +85°C

55 to +125°C

Hold Mode Settling (±0.024%)

40 to +85°C

55 to +125°C

Hold Mode Settling (±0.05%)

40 to +85°C

55 to +125°C

Hold Mode Settling (±0.1%)

40 to +85°C

55 to +125°C

Slew Rate

±300

±430

V/µs

Full Power Bandwidth (±1V)

MHz

Small Signal Bandwidth

100

250

MHz

Output Noise, Hold Mode

µVrms

Feedthrough (2V Step)

Droop Rate

+25°C

±2

±6

mV/µs

40 to +85°C

±5

±15

mV/µs

55 to +125°C

±10

±30

mV/µs

Power Supply Range

+5V Supply

+4.5

+5.5

Volts

5V Supply

5.5

4.5

Volts

Power Supply Current
+5V Supply

+17

+25

+30

5V Supply

Power Dissipation

170

250

300

Power Supply Rejection Ratio

Operating Temp. Range, Case

SHM-14S, SHM-14L

+85

°C

SHM-14LM

+125

°C

Storage Temperature Range

+150

°C

Package Type

SHM-14S

16-Pin plastic SOIC

SHM-14L, SHM-14LM

20-Pin ceramic LCC

Footnotes:

Short circuit protection at ±50mA.

ENVIRONMENTAL

POWER SUPPLY REQUIREMENTS

PERFORMANCE (Cont.)

MIN.

TYP.

MAX. UNITS

SHM-14

HOLD

SAMPLE

-0.8 V

-1.8 V

-0.8 V

-1.8 V

+1 V

-1 V

+1 V

-1 V

Acquisition

Time to

±0.024%

Track-to-hold Settling

to ±0.024%

20ns typ.

7ns typ.

20ns typ.

7ns typ.

Feedthrough -80dB

SAMPLE

HOLD

ANALOG

INPUT

ANALOG

OUTPUT

HOLD

SAMPLE

GROUNDING AND LAYOUT

Obtaining fully specified performance from the SHM-14 requires
careful attention to pc-board layout and power supply decoupling.

For optimal performance, tie all grounds directly to a large ana-
log ground plane beneath and around the package. Bypass all
power supplies to ground with 10µF tantalum capacitors in par-
allel with 0.1µF ceramic capacitors.

Locate the bypass capacitors as close to the unit as possible.

For best performance, controlled impedance transmission line
techniques, such as microstrip, should be used. Mount all com-
ponents as close to the required pins as possible. It is strongly
recommended that the SHM-14 not be socket-mounted.

Figure 2. SHM-14 Simplified Connection Diagram

Figure 3. SHM-14 Control and Timing

5V SUPPLY

INPUT

SAMPLE / HOLD

EXTERNAL HOLD

CAPACITOR

GROUND

+5V SUPPLY

ANALOG OUTPUT

+5V SUPPLY

ANALOG

INPUT

ANALOG

OUTPUT

HOLD

SAMPLE

SHM-14

0.1µF

10µF

0.1µF

+5V

0.1µF

10µF

0.1µF

SAMPLE / HOLD

+5V SUPPLY

R Load
100

1 (2)

3 (4)

5 (7)

8 (10)

16 (19)

15 (18)

14 (17)

13 (15)

12 (14)

11 (13)

10 (12)

9 (11)

NOTES:

1. Pin numbers in ( ) are for CLCC package.

2. For SOIC package:
Pins 2, 4, 6, 7 DO NOT CONNECT

3. For CLCC package:
Pins 1, 3, 5, 16, 20 NOT CONNECTED

Pins 6, 8, 9 DO NOT CONNECT

Refer to Table 1 for optional
HOLD capacitor values.

HOLD

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