DATEL EVB-SHM14 Datasheet

INNOVATION and EX C ELL 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

3

15

ANALOG INPUT

9

SAMPLE/HOLD

SWITCH

DRIVE

16

13 10, 11, 14

12

GROUND

EXTERNAL HOLD

CAPACITOR–5V SUPPLY +5V SUPPLY

+1

+1

SAMPLE/HOLD

C

H

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 100Ω 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.

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

10 –5V SUPPLY

20 NOT CONNECTED
19 SAMPLE/HOLD
18 SAMPLE/HOLD
17 +5V SUPPLY
16 NOT CONNECTED
15 EXT. CAPACITOR
14 GROUND
13 +5V SUPPLY
12 +5V SUPPLY
11 ANALOG OUTPUT

PIN FUNCTION

PIN FUNCTION

INPUT/OUTPUT CONNECTIONS — CLCC

16 SAMPLE/HOLD
15 SAMPLE/HOLD
14 +5V SUPPLY
13 EXT. CAPACITOR
12 GROUND
11 +5V SUPPLY
10 +5V SUPPLY

9 ANALOG OUTPUT

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

PIN FUNCTION

PIN FUNCTION

INPUT/OUTPUT CONNECTIONS — SOIC

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

SHM-14

® ®

INPUTS MIN. TYP. MAX. UNITS

Input Voltage Range –2.5 — +2.5 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

Output Voltage Range –2.5 — +2.5 Volts
Output Current

• ± 30 — — mA

Output Impedance (dc) — 0.3 1 Ω
Stable Capacitive Load — — 50 pF

Nonlinearity (±1V)

+25°C — ±0.0012 — %
–40 to +85°C — — ±0.002 %
–55 to +125°C — — ±0.003 %

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 — –72 — dB
dc to 10MHz

+25°C — –58 — dB
–40 to +85°C — — –50 dB
–55 to +125°C — — –48 dB

Acquisition Time (±0.012%, ±2V)

–40 to +85°C — 25 — ns
–55 to +125°C — 35 — ns

Acquisition Time (±0.024%, ±2V)

–40 to +85°C — 20 35 ns
–55 to +125°C — 25 40 ns

Acquisition Time (±0.05%, ±2V)

–40 to +85°C — 19 30 ns
–55 to +125°C — 20 35 ns

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.

OUTPUTS

PERFORMANCE

FUNCTIONAL SPECIFICATIONS

(Apply over the operating temperature range using a 100Ω 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 (0.3Ω,
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 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 propor­tional 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 — 10 16 ns
–55 to +125°C — 10 19 ns

Hold Mode Settling (±0.012%)

–40 to +85°C — 12 — ns
–55 to +125°C — 15 — 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 16 ns
–55 to +125°C — 6 16 ns

Hold Mode Settling (±0.1%)

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

Slew Rate ±300 ±430 — V/µs
Full Power Bandwidth (±1V) 45 70 — MHz
Small Signal Bandwidth 100 250 — MHz
Output Noise, Hold Mode — 65 — µVrms
Feedthrough (2V Step) — –80 — dB
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 +5.5 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

Operating Temp. Range, Case

SHM-14S, SHM-14L –40 — +85 °C
SHM-14LM –55 — +125 °C

Storage Temperature Range –65 — +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

2