SHM-950 DATEL | Alldatasheet
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Technical content
DATEL’s SHM-950 is a high-speed, highly accurate sample/hold designed for precision, high-speed analog signal processing applica- tions. The SHM-950 features excellent dynamic specifi cations including a maximum acquisition time of only 1.5 microseconds for a 10V step to ±0.001%. Sample-to-hold settling time, to ±0.001% accuracy, is 90 nanosec- onds maximum with an aperture uncertainty of ±25 picoseconds. The SHM-950 is a complete sample/hold circuit, containing a preci- sion MOS hold capacitor and a MOSFET switching confi guration which results in faster switching and better feedthrough attenuation. Addition- ally, a FET input amplifi er design allows faster acquisition and settling times while maintaining a considerably lower droop rate. ADVANCED PRODUCT DATA INPUT/OUTPUT CONNECTIONS Pin Function +5v Digital Supply
2 S/H Control
3 Analog Input
4 Analog Return
5 –15v Supply
6 Analog Output
8 Power Ground
–15V SUPPLY +15V SUPPLY POWER GROUND SWITCH DRIVER
6 ANALOG OUTPU T
2kΩ ANALOG INPUT S/H CONTROL +5V SUPPLY ANALOG RETURN 51 7 2kΩ 100pF Figure 1. Functional Block Diagram
FEATURES
18 bit accuracy Small 8-pin DIP package 1.5μs max. acquisition time to ±0.001% 90ns max. sample-to-hold settling time to ±0.001% 70 V/μs slew rate 84dB feedthrough attenuation ±25 picoseconds aperture uncertainty 280mW maximum power dissipation DATEL 11 Cabot Boulevard, Mansfi eld, MA 02048-1151 USA Tel: (508) 339-3000 www.datel.com e-mail: help@datel.com SHM-950 Miniature, High-Speed ±0.001% Sample-Hold Amplifi ers 12 Sep 2012 MDC_SHM-950.B03 Page 1 of 3
±15V Supply Voltages ±18V +5V Supply Voltages –0.5V to +7V Analog Input ±18V Digital Input –0.5V to +5.5V Output Current ±55 mA Functional Specifi cations (Apply over the operating temperature range with ±15V and +5V supplies unless otherwise specifi ed.) POWER REQUIREMENTS MIN. TYP. MAX. UNITS Voltage Range +15V Supply +11.5 +15.0 +15.5 Volts –15V Supply –11.5 –15.0 –15.5 Volts +5V Supply +4.75 +5.0 +5.25 Volts Power Supply Rejection Ratio — 110 100 dB Quiescent Current Drain +15V Analog Supply — +7 +9 mA –15V Supply — –7 –9 mA +5V Supply — +1 +1.5 mA Power Consumption — 215 280 mW PHYSICAL/ENVIRONMENTAL Operating Temp. Range, Case SHM-950MC 0 to +70°C SHM-950ME –40 to +100°C Storage Temperature Range –65 to +150°C Thermal Impedance θjc 15°C/W θca 35°C/W Package Type 8-pin ceramic DIP Footnotes: ➀ Full Scale (FS) = 10V. Full Scale Range (FSR) = 20V. ➁ Sample-to-hold offset error (pedestal) is constant regardless of input/output level. Technical Notes 1. All ground pins 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 ground pins directly to it. Take care to ensure that no ground potentials can exist between ground pins. 2. External 0.1μF to 4.7μF tantalum bypass capacitors are required in critical applications. 3. A logic 1 on S/H puts the unit in the sample mode. A logic 0 puts the unit in hold mode. 4. The maximum capacitive load to avoid oscillation is typically 250pF. Recom- mended 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. Greater load capacitances will affect both acquisition and settling time. 5. Gain and offset adjusting can be accomplished using the external circuitry shown in Figure 2. Adjust offset with a 0V input. Adjust gain with a ±FS input. Adjust so that the output in the hold mode matches the input.
ORDERING INFORMATION
Model Number Operating Temperature Range Package RoHS SHM-950MC 0 to +70°C DIP No SHM-950ME -40 to +100°C DIP No SHM-950GC 0 to +70°C SMT No SHM-950GE -40 to +100°C SMT No SHM-950MC-C 0 to +70°C DIP Yes SHM-950ME-C -40 to +100°C DIP Yes SHM-950GC-C 0 to +70°C SMT Yes SHM-950GE-C -40 to +100°C SMT Yes For availability of high-reliability versions of the SHM-950, contact DATEL. ANALOG INPUT/OUTPUT MIN. TYP. MAX. UNITS Input/Output Voltage Range ±15V Nominal Supply ±10 ±11.5 — Volts ±12V Nominal Supply ±7 ±8.5 — Volts Input Impedance 1.75 2 — kΩ Output Current — — ±40 mA Output Impedance — 0.1 — Ω Capacitive Load 100 250 — pF DIGITAL INPUT Input Logic Levels Logic 1 +2.0 — — Volts Logic 0 — — +0.8 Volts Loading Logic 1 — — +5 µA Logic 0 — — –5 µA TRANSFER CHARACTERISTICS Gain — –1 — V/V Gain Error, +25°C — ±0.05 ±0.5 % Gain Error, -55 to +85°C — ±0.05 ±0.6 % Sample Mode Offset, +25°C — ±2 ±7 mV Sample Mode Offset, -55 to +85°C — ±5 ±10 mV Sample-to-Hold Offset, +25°C ➁ — ±5 ±20 mV Sample-to-Hold Offset, -55 to +85°C — ±10 ±50 mV Linearity Error ➀ — ±0.001 ±0.005 %FS DYNAMIC CHARACTERISTICS Acquisition Time 10V to ±0.001%FS (±0.1 mV) +25°C — 1000 1500 ns –55 to +85°C — — 1600 ns 10V to ±0.01%FS (±1 mV) +25°C — 700 1200 ns –55 to +85°C — — 1400 ns 1V to ±1%FS (±10 mV) — 350 500 ns Sample-to-Hold Settling Time Sample-to-Hold Transient — 50 — mVp-p Aperture Delay Time — 15 20 ns Aperture Uncertainty (Jitter) — ±25 ±50 ps Output Slew Rate ±40 70 — V/µs Output Droop 0 to +70°C — ±15 ±80 µV/µs Feedthrough Rejection — –84 –74 dB DATEL 11 Cabot Boulevard, Mansfi eld, MA 02048-1151 USA Tel: (508) 339-3000 www.datel.com e-mail: help@datel.com SHM-950 Miniature, High-Speed ±0.001% Sample-Hold Amplifi ers 12 Sep 2012 MDC_SHM-950.B03 Page 2 of 3
Figure 2. Offset and Gain Adjustments