Datasheet EVB-SHM12 Datasheet (DATEL)

INNOVATION and EX C ELL E N C E

® ®

GROUND

NOT CONNECTED

FEATURES

• Fast acquisition time:

10ns to ±0.1%
15ns to ±0.024%
20ns to ±0.012%

• ±0.006% Nonlinearity

• 65µVrms output noise

• 120MHz small signal bandwidth

• 55MHz full power bandwidth

• –80dB feedthrough

• 1ps Aperture jitter

• 250mW power dissipation

• Low cost

GENERAL DESCRIPTION

The SHM-12 is an extremely high-speed and accurate
monolithic sample-and-hold amplifier designed for fast data
acquisition applications. The SHM-12 is accurate (±1LSB at 12
bits over the full military temperature range) and is very fast
(10ns and 15ns acquisition times to accuracies of 10 and 12­bits, respectively). With this high performance and a full power
bandwidth of 55MHz, the SHM-12 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
±0.5mV/µs. The 30mA output current and guaranteed
specifications for a 100Ω load provide high drive capability.
Operating from ±5V supplies, the SHM-12 consumes only
250mW of power.

SHM-12

Ultra-Fast, 12-Bit Linear

Monolithic Sample-Hold Amplifiers

INPUT/OUTPUT CONNECTIONS

(CLCC and SOIC-20 Packages)

PIN FUNCTION

1 –5V SUPPLY
2 –5V SUPPLY
3 NOT CONNECTED
4 ANALOG INPUT
5 –5V SUPPLY
6 DO NOT CONNECT
7 –5V SUPPLY
8 DO NOT CONNECT
9 –5V SUPPLY

10 –5V SUPPLY

The SHM-12 is built using a fast complementary bipolar
process. The device is available in both military and industrial
temperature ranges. The SHM-12 is packaged in a 20-pin
plastic SOIC or ceramic LCC.

PIN FUNCTION

20 +5V SUPPLY
19 SAMPLE/HOLD
18 SAMPLE/HOLD
17 +5V SUPPLY
16 GROUND
15 EXT. CAPACITOR
14 GROUND
13 +5V SUPPLY
12 +5V SUPPLY
11 ANALOG OUTPUT

EXTERNAL HOLD

CAPACITOR–5V SUPPLY +5V SUPPLY

1, 2, 5, 7, 9, 10

ANALOG INPUT

SAMPLE/HOLD

SAMPLE/HOLD

DATEL, Inc., 11 Cabot Boulevard, Mansfield, MA 02048-1151 (U.S.A.) • Tel: [phone] Fax: [phone] • For immediate assistance [phone]

4

18

19

+1

15pF

SWITCH

DRIVE

Figure 1. SHM-12 Functional Block Diagram

15 12, 13, 17, 20

C

H

14, 16

11

3

6, 8

ANALOG
OUTPUT

DO NOT
CONNECT

+1

SHM-12

® ®

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 mA
Digital Inputs <Supply Voltages Volts
Junction Temperature +175 °C
Lead Temperature (10 seconds) +300 °C

Output shorted to any supply will cause permanent damage.

FUNCTIONAL SPECIFICATIONS

(Apply over the operating temperature range using a 100Ω resistive load, 10pF
capacitive load, ECL digital input levels, a 47pF external hold capacitor, and ±5V
nominal supplies, unless otherwise specified.)

INPUTS MIN. TYP. MAX. UNITS

Input Voltage Range –1.5 — +1.5 Volts
Input Impedance 0.3 1 — MΩ
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 — –30 –150 µA

OUTPUTS

Output Voltage Range –1.5 — +1.5 Volts
Output Current
Output Impedance (dc) — 0.3 1 Ω
Stable Capacitive Load — — 50 pF

PERFORMANCE

Nonlinearity (±1V)

+25°C — ±0.006 — %
–40 to +85°C — — ±0.024 %
–55 to +125°C — — ±0.024 %

Sample Mode Offset

+25°C — ±12 — mV
–40 to +85°C — — ±20 mV
–55 to +125°C — — ±30 mV

Pedestal

+25°C — ±3 — mV

–40 to +85°C — — ±20 mV

–55 to +125°C — — ±20 mV

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 — 2 — ns
–55 to +125°C — 2 — ns

Aperture Jitter

–40 to +85°C — 1 — ps rms
–55 to +125°C — 1 — ps rms

Harmonic Distortion (±1V)

dc to 1MHz — –75 — dB
dc to 10MHz

+25°C — –62 — dB
–40 to +85°C — — –56 dB
–55 to +125°C — — –54 dB

Acquisition Time (±0.012%, ±1V)

–40 to +85°C — 20 — ns
–55 to +125°C — 30 — ns

Acquisition Time (±0.024%, ±1V)

–40 to +85°C — 15 30 ns
–55 to +125°C — 25 40 ns

Acquisition Time (±0.05%, ±1V)

–40 to +85°C — 12 25 ns
–55 to +125°C — 15 30 ns

• ± 30 — — mA

PERFORMANCE (Cont.) MIN. TYP. MAX. UNITS

Acquisition Time (±0.1%, ±1V)

–40 to +85°C — 10 20 ns
–55 to +125°C — 10 20 ns

Hold Mode Settling (±0.012%)

–40 to +85°C — 10 — ns
–55 to +125°C — 10 — ns

Hold Mode Settling (±0.024%)

–40 to +85°C — 7 18 ns
–55 to +125°C — 7 18 ns

Hold Mode Settling (±0.05%)

–40 to +85°C — 6 15 ns
–55 to +125°C — 6 15 ns

Hold Mode Settling (±0.1%)

–40 to +85°C — 5 12 ns
–55 to +125°C — 5 12 ns

Slew Rate ±220 ±350 — V/µs
Full Power Bandwidth (±1V) 35 55 — MHz
Small Signal Bandwidth 50 120 — MHz
Output Noise, Hold Mode — 65 — µVrms
Feedthrough (2V Step) — –80 — dB
Droop Rate

+25°C — ±0.5 ±1.5 mV/µs
–40 to +85°C — ±2 ±5 mV/µs
–55 to +125°C — ±2.5 ±10 mV/µs

POWER SUPPLY REQUIREMENTS

Power Supply Range

+5V Supply +4.5 +5 +5.5 Volts
–5V Supply –5.5 –5 –4.5 Volts

Power Supply Current

+5V Supply +17 +25 +30 mA
–5V Supply –17 –25 –30 mA

Power Dissipation 170 250 300 mW
Power Supply Rejection Ratio 40 60 — dB

ENVIRONMENTAL

Operating Temp. Range, Case

SHM-12S, SHM-12L –40 — +85 °C
SHM-12LM –55 — +125 °C

Storage Temperature Range –65 — +150 °C
Package Type

SHM-12S 20-Pin plastic SOIC
SHM-12L, SHM-12LM 20-Pin ceramic LCC

Footnotes:

• Short circuit protection at ±50mA.

TECHNICAL NOTES

The SHM-12 employs an open loop architecture to achieve its
superior high-speed characteristics. The first stage buffer
amplifier incorporates the sample-and-hold switch. This 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 (0.3Ω, typical) output impedance. Gain and
linearity are not affected by heavy loads.

The design has been optimized to achieve the high accuracy
associated with fast transient responses over the military tem­perature range. During the track-to-hold transient, the integral
nonlinearity is not affected and the pedestal remains constant
over the full ±1.5V input range.

An innovative circuit design ensures an extremely low droop rate.
An external hold capacitor can be added to the 15pF internal
hold capacitor to obtain a lower droop rate (the droop rate is pro­portional to the inverse of the total hold capacitor value) without
increasing transient response times by more than a few ns. The
external hold capacitor should not exceed 100pF.

2

® ®

+

–5V

+5V

ANALOG

ANALOG

15ns typ.

GROUNDING AND LAYOUT

Obtaining fully specified performance from the SHM-12 requires
careful attention to pc-board layout and power supply decoupling.

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

SHM-12

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 com­ponents as close to the required pins as possible. It is strongly
recommended that the SHM-12 not be socket-mounted.

ANALOG

INPUT

Load

C

50Ω

HOLD

Refer to Table 1 for optional
HOLD capacitor value.

0.1µF

SHM-12

1

–5V SUPPLY

0.1µF

50

Ω

0.1µF

10µF

0.1µF

2

–5V SUPPLY

4

INPUT

5

–5V SUPPLY

7

–5V SUPPLY

9

–5V SUPPLY

10

–5V SUPPLY

Pin 3 is not connected;
do not connect pins 6 and 8.

SAMPLE / HOLD

SAMPLE / HOLD

+5V SUPPLY
+5V SUPPLY

EXTERNAL HOLD

CAPACITOR

GROUND

+5V SUPPLY

+5V SUPPLY

OUTPUT

19

18

20

17

15

14, 16

13

12

11

R
100Ω

0.1µF

0.1µF

0.1µF

10µF

50Ω

SAMPLE

HOLD

ANALOG
OUTPUT

Figure 2. SHM-12 Simplified Connection Diagram

HOLD

SAMPLE

INPUT

OUTPUT

-0.8 V

-1.8 V

-0.8 V

-1.8 V

+1 V

-1 V

+1 V

-1 V

SAMPLE

SAMPLE

HOLD

HOLD

Acquisition

Time to

±0.024%

15ns typ.

7ns typ.

Feedthrough -80dB

Track-to-hold Settling

to ±0.024%

Figure 3. SHM-12 Control and Timing

3

7ns typ.

SHM-12

–5V SUPPLY

® ®

ANALOG

INPUT

11, 12, 15

GROUND

1, 2, 3, 4

Evaluation Board
for CLCC-20 Version

20

0.1µF

Ω

51

0.1µF

0.1µF

GROUND PLANE

1, 2

5, 7

9, 10

–5V SUPPLY

4

INPUT

–5V SUPPLY

–5V SUPPLY

SHM-12

SAMPLE / HOLD

EXTERNAL HOLD

SAMPLE / HOLD

+5V SUPPLY

CAPACITOR

GROUND

+5V SUPPLY

+5V SUPPLY

OUTPUT

0.1µF

19

18

17, 20

15

14, 16

13

12

11

–5V SUPPLY

Ω

130

82Ω

C

HOLD

CHOLD

Refer to Table 1.

130Ω

82Ω

0.1µF

= 100pF;

0.1µF

0.1µF

16, 17, 18, 19

SAMPLE

14

HOLD

13

+5V SUPPLY

6, 7, 8, 9, 10

ANALOG
OUTPUT

5

Figure 4. SHM-12 Evaluation Board Schematic

Table 1. Optional External HOLD Capacitor

Operating Type of HOLD Capacitor

Model Temperature Range (Ceramic, ≤100pF, ±10%)

SHM-12L, -12S –40 to +85°C Type I or II, NPO or X7R
SHM-12LM –55 to +125°C Type I or NPO

4

® ®

C

EXT

PLASTIC
STANDOFF

20
19

R1

C2

18
17
16
15

C1

C7

R4

C5

14
13
12

C6

R6

R3

R5

11

C3

C4

10

SHM-12

INCHES

(mm)

0.100
(2.54)

1
2

3
4
5
6
7
8

0.018

9

(0.45)

0.43
(11)

0.13
(3.3)

(TOP VIEW)

0.85

(21.59)

1
2

3
4
5
6
7
8
9

20
19
18
17
16
15
14
13
12

10 11

1.10

(27.94)

(BOTTOM VIEW)

0.95

(24.13)

Figure 5. SHM-12 Evaluation Board Dimensions

SHM-12 Evaluation Board Connections

PIN FUNCTION

1 GROUND
2 GROUND
3 GROUND
4 GROUND
5 ANALOG OUTPUT
6 +5V SUPPLY
7 +5V SUPPLY
8 +5V SUPPLY

9 +5V SUPPLY
10 +5V SUPPLY
11 –5V SUPPLY
12 –5V SUPPLY
13 HOLD
14 SAMPLE
15 –5V SUPPLY
16 –5V SUPPLY
17 –5V SUPPLY
18 –5V SUPPLY
19 –5V SUPPLY
20 ANALOG INPUT

5

H

BOTTOM VIEW

PIN 1 INDEX

INNOVATION and EX C ELL E N C E

SHM-12

ISO 9001

REGISTERED

® ®

MECHANICAL DIMENSIONS

TOP VIEW

A

20 11

1 10

E

G

D

B C

D

C B

F

J

L

SOIC-20 Package

INCHES MILLIMETERS

SYMBOL MIN. MAX. MIN. MAX.

A 0.500 0.510 12.70 12.95
B 0.400 0.410 10.16 10.41
C 0.292 0.299 7.40 7.60
D 0.014 0.019 0.35 0.48
E 0.0500 BSC 1.27 BSC

K

F 0.0039 0.0112 0.10 0.30
G 0° 8° 0° 8°
H 0.020 0.040 0.51 1.02

J 0.097 0.104 2.46 2.64

G

K 0.010 0.020 0.25 0.51
L 0.0091 0.0125 0.23 0.32

A

CLCC-20 Package

INCHES

SYMBOL MIN. MAX. MIN. MAX.

A 0.064 0.100 1.63 2.54
B 0.045 0.055 1.14 1.40
C 0.075 REF 1.91 REF

E

D 0.342 0.358 8.69 9.09
E 0.022 0.028 0.56 0.71
F 0.020 REF 0.51
G 0.050 BSC 1.27 BSC
H 0.040 REF 1.02

MILLIMETERS

® ®

DATEL, Inc. 11 Cabot Boulevard, Mansfield, MA 02048-1151
Tel: [phone] [phone] Fax: [phone]
Internet: www.datel.com E-mail:[e-mail]
Data Sheet Fax Back: [phone]

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.

(H x 45°

3 PLACES)

H

F

(F x 45°)

ORDERING INFORMATION

MODEL NUMBER PACKAGE TEMPERATURE RANGE
SHM-12S SOIC-20 –40 to +85°C

SHM-12L CLCC-20 –40 to +85°C
SHM-12LM CLCC-20 –55 to +125°C
EVB-SHM12 Evaluation Board (with SHM-12LM)

Contact DATEL for availability of high-reliability models.

ISO 9001

DATEL (UK) LTD. Tadley, England Tel: [phone]
DATEL S.A.R.L. Montigny Le Bretonneux, France Tel: [phone]
DATEL GmbH München, Germany Tel: [phone]
DATEL KK Tokyo, Japan Tel: [phone], Osaka Tel: [phone]

DS-0310 10/96