Overview
The SMP18FP, produced by Analog Devices Inc., is a monolithic octal sample-and-hold amplifier with multiplexed input. It is designed using advanced oxide isolated CMOS technology, offering high accuracy, low droop rate, and fast acquisition time. This component is ideal for systems requiring cycled calibration or an array of control voltages, making it suitable for various applications including multiple path timing deskew, mass flow/process control systems, multichannel data acquisition systems, and medical and analytical instrumentation.
Key Specifications
| Parameter | Symbol | Conditions | Min | Typ | Max | Units |
|---|---|---|---|---|---|---|
| Linearity Error | - | -3 V ≤ VIN ≤ +3 V | - | 0.01% | - | % |
| Buffer Offset Voltage | VOS | TA = +25°C, VIN = 0 V | 2.5 | 10 | - | mV |
| Hold Step | VHS | VIN = 0 V, TA = +25°C to +85°C | 4 | 6 | - | mV |
| Acquisition Time | tAQ | TA = +25°C, –3 V to +3 V to 0.1% | - | 2.5 | - | µs |
| Channel Select Time | tCH | - | - | 90 | - | ns |
| Supply Current | IDD | TA = +25°C | - | 7.5 | - | mA |
| Power Supply Range | - | - | 7 | - | 15 | V |
Key Features
- High speed version with internal hold capacitors and low droop rate.
- TTL/CMOS compatible logic inputs.
- Single or dual supply operation.
- Break-before-make channel addressing compatible with CD4051 pinout.
- Internally regulated TTL supply for compatibility over the full supply range.
- Buffer outputs stable with capacitive loads up to 500 pF.
- No external logic required due to internal decoder.
- Available in 16-pin plastic DIP, narrow body SO-16 surface-mount SOIC package, or thin TSSOP-16 package.
Applications
- Multiple path timing deskew for A.T.E. and memory programmers.
- Mass flow/process control systems.
- Multichannel data acquisition systems.
- Robotics and control systems.
- Medical and analytical instrumentation.
- Event analysis and stage lighting control.
Q & A
- What is the typical linearity error of the SMP18FP?
The typical linearity error of the SMP18FP is 0.01%. - What is the acquisition time of the SMP18FP?
The acquisition time is less than 2.5 microseconds to acquire a 10-bit input signal to ±1/2 LSB. - Can the SMP18FP operate with single or dual supplies?
Yes, the SMP18FP can operate with either single or dual supplies over a voltage range of 7 to 15 volts. - What is the buffer offset voltage of the SMP18FP?
The buffer offset voltage is 2.5 mV to 10 mV at TA = +25°C, VIN = 0 V. - What is the hold step of the SMP18FP?
The hold step is about 4 mV with little variation over the full output voltage range. - How stable are the buffer outputs with capacitive loads?
The buffer outputs are stable with capacitive loads up to 500 pF. - Does the SMP18FP require external logic for channel addressing?
No, the SMP18FP features an internal decoder and break-before-make switching, eliminating the need for external logic. - In what packages is the SMP18FP available?
The SMP18FP is available in a 16-pin plastic DIP, narrow body SO-16 surface-mount SOIC package, or thin TSSOP-16 package. - What are some common applications of the SMP18FP?
Common applications include multiple path timing deskew, mass flow/process control systems, multichannel data acquisition systems, and medical and analytical instrumentation. - How does the SMP18FP handle power supply sequencing?
VDD should be applied to the SMP18FP before the logic input signals to avoid latchup, although the device is designed to be immune to latchup.
