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| (R) (R) SHM-12 Ultra-Fast, 12-Bit Linear Monolithic Sample-Hold Amplifiers IN N O VA T IO N a n d E X C E L L E N C E FEATURES * Fast acquisition time: 10ns to 0.1% 15ns to 0.024% 20ns to 0.012% * 0.006% Nonlinearity * 65Vrms output noise * 120MHz small signal bandwidth * 55MHz full power bandwidth * -80dB feedthrough * 1ps Aperture jitter * 250mW power dissipation * Low cost INPUT/OUTPUT CONNECTIONS (CLCC and SOIC-20 Packages) PIN 1 2 3 4 5 6 7 8 9 10 FUNCTION -5V SUPPLY -5V SUPPLY NOT CONNECTED ANALOG INPUT -5V SUPPLY DO NOT CONNECT -5V SUPPLY DO NOT CONNECT -5V SUPPLY -5V SUPPLY PIN 20 19 18 17 16 15 14 13 12 11 FUNCTION +5V SUPPLY SAMPLE/HOLD SAMPLE/HOLD +5V SUPPLY GROUND EXT. CAPACITOR GROUND +5V SUPPLY +5V SUPPLY ANALOG OUTPUT 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/s. The 30mA output current and guaranteed specifications for a 100 load provide high drive capability. Operating from 5V supplies, the SHM-12 consumes only 250mW of power. 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. -5V SUPPLY 1, 2, 5, 7, 9, 10 EXTERNAL HOLD CAPACITOR 15 +5V SUPPLY 12, 13, 17, 20 ANALOG INPUT 4 +1 CH 15pF +1 11 ANALOG OUTPUT 3 NOT CONNECTED SAMPLE/HOLD SAMPLE/HOLD 18 19 SWITCH DRIVE 6, 8 DO NOT CONNECT 14, 16 GROUND Figure 1. SHM-12 Functional Block Diagram 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 (R) (R) SHM-12 ABSOLUTE MAXIMUM RATINGS PARAMETERS +5V Supply -5V Supply Analog Input LIMITS UNITS Volts Volts Volts Volts mA Volts C C 0 to +6 0 to -6 +5V Supply -1 -5V Supply +1 Continuous Output Current 50 Digital Inputs FUNCTIONAL SPECIFICATIONS (Apply over the operating temperature range using a 100 resistive load, 10pF capacitive load, ECL digital input levels, a 47pF external hold capacitor, and 5V nominal supplies, unless otherwise specified.) INPUTS Input Voltage Range Input Impedance Digitals Inputs (Balanced ECL) Logic Levels Logic 1 Logic 0 Logic Loading Logic 1 Logic 0 OUTPUTS Output Voltage Range Output Current * Output Impedance (dc) Stable Capacitive Load PERFORMANCE Nonlinearity (1V) +25C -40 to +85C -55 to +125C Sample Mode Offset +25C -40 to +85C -55 to +125C Pedestal +25C -40 to +85C -55 to +125C Gain, +25C Gain Drift (1V) -40 to +85C -55 to +125C Aperture Delay -40 to +85C -55 to +125C Aperture Jitter -40 to +85C -55 to +125C Harmonic Distortion (1V) dc to 1MHz dc to 10MHz +25C -40 to +85C -55 to +125C Acquisition Time (0.012%, 1V) -40 to +85C -55 to +125C Acquisition Time (0.024%, 1V) -40 to +85C -55 to +125C Acquisition Time (0.05%, 1V) -40 to +85C -55 to +125C -1.5 30 -- -- -- -- 0.3 -- +1.5 -- 1 50 Volts mA pF MIN. -1.5 0.3 -1.5 -2.5 -- -- TYP. -- 1 -- -- +10 -30 MAX. UNITS +1.5 -- +1.8 +0.8 +50 -150 Volts M Volts Volts A A 20-Pin plastic SOIC 20-Pin ceramic LCC 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 (0.3, 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 (R) (R) SHM-12 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 10F tantalum capacitors in parallel with 0.1F 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 components as close to the required pins as possible. It is strongly recommended that the SHM-12 not be socket-mounted. 50 SHM-12 1 -5V SUPPLY 0.1F 2 -5V SUPPLY 4 INPUT 5 50 7 -5V SUPPLY 0.1F 9 -5V SUPPLY +5V SUPPLY +5V SUPPLY 10F + 10 -5V SUPPLY OUTPUT R Load 100 -5V SUPPLY +5V SUPPLY EXTERNAL HOLD CAPACITOR GROUND 13 12 11 0.1F 0.1F +5V SUPPLY 17 15 14, 16 CHO LD SAMPLE / HOLD SAMPLE / HOLD 19 50 SAMPLE 18 20 0.1F HOLD ANALOG INPUT Refer to Table 1 for optional HOLD capacitor value. ANALOG OUTPUT 10F Pin 3 is not connected; do not connect pins 6 and 8. 0.1F 0.1F +5V -5V Figure 2. SHM-12 Simplified Connection Diagram -0.8 V HOLD -1.8 V -0.8 V SAMPLE -1.8 V +1 V ANALOG INPUT -1 V 15ns typ. +1 V ANALOG OUTPUT -1 V Feedthrough -80dB Track-to-hold Settling to 0.024% 15ns typ. 7ns typ. 7ns typ. Acquisition Time to 0.024% SAMPLE HOLD SAMPLE HOLD Figure 3. SHM-12 Control and Timing 3 (R) (R) SHM-12 Evaluation Board for CLCC-20 Version 0.1F 130 -5V SUPPLY 16, 17, 18, 19 SAMPLE SHM-12 1, 2 0.1F SAMPLE / HOLD ANALOG INPUT 20 -5V SUPPLY 19 SAMPLE / HOLD 82 130 14 18 17, 20 15 14, 16 13 12 11 0.1F 0.1F C HOLD 82 0.1F 4 INPUT +5V SUPPLY EXTERNAL HOLD CAPACITOR HOLD 13 51 0.1F 5, 7 -5V SUPPLY GROUND +5V SUPPLY +5V SUPPLY CHOLD = 100pF; Refer to Table 1. +5V SUPPLY 6, 7, 8, 9, 10 -5V SUPPLY 11, 12, 15 9, 10 0.1F -5V SUPPLY OUTPUT ANALOG OUTPUT 5 GROUND 1, 2, 3, 4 GROUND PLANE Figure 4. SHM-12 Evaluation Board Schematic Table 1. Optional External HOLD Capacitor Model SHM-12L, -12S SHM-12LM Operating Temperature Range -40 to +85C -55 to +125C Type of HOLD Capacitor (Ceramic, 100pF, 10%) Type I or II, NPO or X7R Type I or NPO 4 (R) (R) SHM-12 INCHES (mm) 0.43 (11) 0.13 (3.3) PLASTIC STANDOFF (TOP VIEW) 0.85 (21.59) 0.100 (2.54) 20 19 18 17 C1 C5 R1 C2 C3 1 2 3 4 5 C4 C7 R4 R3 CEXT 1 2 3 4 5 6 7 8 0.018 (0.45) 20 19 18 17 16 15 14 13 12 11 1.10 (27.94) 16 15 14 13 12 11 6 7 8 9 10 C6 R6 R5 9 10 (BOTTOM VIEW) 0.95 (24.13) Figure 5. SHM-12 Evaluation Board Dimensions SHM-12 Evaluation Board Connections PIN 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 FUNCTION GROUND GROUND GROUND GROUND ANALOG OUTPUT +5V SUPPLY +5V SUPPLY +5V SUPPLY +5V SUPPLY +5V SUPPLY -5V SUPPLY -5V SUPPLY HOLD SAMPLE -5V SUPPLY -5V SUPPLY -5V SUPPLY -5V SUPPLY -5V SUPPLY ANALOG INPUT 5 (R) (R) SHM-12 MECHANICAL DIMENSIONS TOP VIEW A 20 11 J L SOIC-20 Package SYMBOL A B C D E F G H J K L INCHES MIN. MAX. 0.500 0.510 0.400 0.410 0.292 0.299 0.014 0.019 0.0500 BSC 0.0039 0.0112 0 8 0.020 0.040 0.097 0.104 0.010 0.020 0.0091 0.0125 MILLIMETERS MIN. MAX. 12.70 12.95 10.16 10.41 7.40 7.60 0.35 0.48 1.27 BSC 0.10 0.30 0 8 0.51 1.02 2.46 2.64 0.25 0.51 0.23 0.32 C B K H 1 E D G 10 F A D CLCC-20 Package SYMBOL A B C D E F G H INCHES MIN. MAX. 0.064 0.100 0.045 0.055 0.075 REF 0.342 0.358 0.022 0.028 0.020 REF 0.050 BSC 0.040 REF MILLIMETERS MIN. MAX. 1.63 2.54 1.14 1.40 1.91 REF 8.69 9.09 0.56 0.71 0.51 1.27 BSC 1.02 B C E G PIN 1 INDEX (H x 45 3 PLACES) H BOTTOM VIEW F (F x 45) ORDERING INFORMATION MODEL NUMBER SHM-12S SHM-12L SHM-12LM EVB-SHM12 PACKAGE TEMPERATURE RANGE SOIC-20 -40 to +85C CLCC-20 -40 to +85C CLCC-20 -55 to +125C Evaluation Board (with SHM-12LM) Contact DATEL for availability of high-reliability models. (R) (R) IN N O VA T IO N a n d E X C E L L E N C E ISO 9001 R E G I S T E R E D DS-0310 10/96 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 Data Sheet Fax Back: (508) 261-2857 DATEL (UK) LTD. Tadley, England Tel: (01256)-880444 DATEL S.A.R.L. Montigny Le Bretonneux, France Tel: 1-34-60-01-01 DATEL GmbH Munchen, Germany Tel: 89-544334-0 DATEL KK Tokyo, Japan Tel: 3-3779-1031, Osaka Tel: 6-354-2025 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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