Datasheet LT1191 (Analog Devices) - 10
| Hersteller | Analog Devices |
| Beschreibung | Ultrahigh Speed Operational Amplifier |
| Seiten / Seite | 12 / 10 — APPLICATI. S I FOR ATIO. Murphy Circuits. Driving Capacitive Load. An … |
| Dateiformat / Größe | PDF / 262 Kb |
| Dokumentensprache | Englisch |
APPLICATI. S I FOR ATIO. Murphy Circuits. Driving Capacitive Load. An Unterminated Cable Is. A 1X Scope Probe Is a
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LT1191
O U U W U APPLICATI S I FOR ATIO
The ability to maintain shutoff is shown on the curve Other precautions include: Shutdown Supply Current vs Temperature in the Typical 1. Use a ground plane (see Design Note 50, High Fre- Performance Characteristics section. At very high quency Amplifier Evaluation Board). elevated temperatures it is important to hold the SHDN pin close to the negative supply to keep the supply current 2. Do not use high source impedances. The input from increasing. capacitance of 2pF and RS = 10k, for instance, will give an 8MHz – 3dB bandwidth.
Murphy Circuits
3. PC board socket may reduce stability. There are several precautions the user should take when 4. A feedback resistor of 1k or lower reduces the effects using the LT1191 in order to realize its full capability. of stray capacitance at the inverting input. (For in- Although the LT1191 can drive a 30pF load, isolating the stance, closed-loop gain of 2 can use R capacitance with 10Ω can be helpful. Precautions prima- FB = 300Ω and R rily have to do with driving large capacitive loads. G = 300Ω.)
Driving Capacitive Load Driving Capacitive Load
LT1191 • TA11 LT1191 • TA12 AV = –1, IN DEMO BOARD, CL = 30pF AV = –1, IN DEMO BOARD, CL = 30pF WITH 10Ω ISOLATING RESISTOR
Murphy Circuits
5V 5V 5V 3 7 3 3 7 7 + + + COAX 6 6 6 LT1191 LT1191 LT1191 2 2 2 – 4 – 4 – 4 1X SCOPE –5V –5V –5V PROBE SCOPE PROBE LT1191 • TA13
An Unterminated Cable Is A 1X Scope Probe Is a A Scope Probe on the Inverting a Large Capacitive Load Large Capacitive Load Input Reduces Phase Margin
10
O U U W U APPLICATI S I FOR ATIO
The ability to maintain shutoff is shown on the curve Other precautions include: Shutdown Supply Current vs Temperature in the Typical 1. Use a ground plane (see Design Note 50, High Fre- Performance Characteristics section. At very high quency Amplifier Evaluation Board). elevated temperatures it is important to hold the SHDN pin close to the negative supply to keep the supply current 2. Do not use high source impedances. The input from increasing. capacitance of 2pF and RS = 10k, for instance, will give an 8MHz – 3dB bandwidth.
Murphy Circuits
3. PC board socket may reduce stability. There are several precautions the user should take when 4. A feedback resistor of 1k or lower reduces the effects using the LT1191 in order to realize its full capability. of stray capacitance at the inverting input. (For in- Although the LT1191 can drive a 30pF load, isolating the stance, closed-loop gain of 2 can use R capacitance with 10Ω can be helpful. Precautions prima- FB = 300Ω and R rily have to do with driving large capacitive loads. G = 300Ω.)
Driving Capacitive Load Driving Capacitive Load
LT1191 • TA11 LT1191 • TA12 AV = –1, IN DEMO BOARD, CL = 30pF AV = –1, IN DEMO BOARD, CL = 30pF WITH 10Ω ISOLATING RESISTOR
Murphy Circuits
5V 5V 5V 3 7 3 3 7 7 + + + COAX 6 6 6 LT1191 LT1191 LT1191 2 2 2 – 4 – 4 – 4 1X SCOPE –5V –5V –5V PROBE SCOPE PROBE LT1191 • TA13
An Unterminated Cable Is A 1X Scope Probe Is a A Scope Probe on the Inverting a Large Capacitive Load Large Capacitive Load Input Reduces Phase Margin
10