Datasheet LT1357 (Analog Devices) - 9
| Hersteller | Analog Devices |
| Beschreibung | 25MHz, 600V/µs Op Amp |
| Seiten / Seite | 12 / 9 — TYPICAL PERFORMANCE CHARACTERISTICS. Large-Signal Transient. (AV = 1). V … |
| Dateiformat / Größe | PDF / 262 Kb |
| Dokumentensprache | Englisch |
TYPICAL PERFORMANCE CHARACTERISTICS. Large-Signal Transient. (AV = 1). V = –1). V = 1, CL = 10,000pF). APPLICATIONS INFORMATION
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LT1357
W U TYPICAL PERFORMANCE CHARACTERISTICS Large-Signal Transient Large-Signal Transient Large-Signal Transient (AV = 1) (A (A V = –1) V = 1, CL = 10,000pF)
1357 TA34 1357 TA35 1357 TA36
U U W U APPLICATIONS INFORMATION
The LT1357 may be inserted directly into many high The parallel combination of the feedback resistor and gain speed amplifier applications improving both DC and AC setting resistor on the inverting input can combine with performance, provided that the nulling circuitry is the input capacitance to form a pole which can cause removed. The suggested nulling circuit for the LT1357 is peaking or oscillations. For feedback resistors greater shown below. than 5kΩ, a parallel capacitor of value
Offset Nulling
CF > (RG • CIN)/RF V+ should be used to cancel the input pole and optimize 3 7 + dynamic performance. For unity-gain applications where 6 LT1357 a large feedback resistor is used, C 4 F should be greater 2 – 8 than or equal to CIN. 1 10k
Capacitive Loading
V– The LT1357 is stable with any capacitive load. This is 1357 AI01 accomplished by sensing the load induced output pole and
Layout and Passive Components
adding compensation at the amplifier gain node. As the capacitive load increases, both the bandwidth and phase The LT1357 amplifier is easy to apply and tolerant of less margin decrease so there will be peaking in the frequency than ideal layouts. For maximum performance (for domain and in the transient response as shown in the example, fast settling time) use a ground plane, short lead typical performance curves.The photo of the small-signal lengths and RF-quality bypass capacitors (0.01µF to 0.1µF). response with 1000pF load shows 50% peaking. The For high drive current applications use low ESR bypass large-signal response with a 10,000pF load shows the capacitors (1µF to 10µF tantalum). Sockets should be output slew rate being limited to 5V/µs by the short-circuit avoided when maximum frequency performance is current. Coaxial cable can be driven directly, but for best required, although low profile sockets can provide pulse fidelity a resistor of value equal to the characteristic reasonable performance up to 50MHz. For more details impedance of the cable (i.e., 75Ω) should be placed in see Design Note 50. 9
W U TYPICAL PERFORMANCE CHARACTERISTICS Large-Signal Transient Large-Signal Transient Large-Signal Transient (AV = 1) (A (A V = –1) V = 1, CL = 10,000pF)
1357 TA34 1357 TA35 1357 TA36
U U W U APPLICATIONS INFORMATION
The LT1357 may be inserted directly into many high The parallel combination of the feedback resistor and gain speed amplifier applications improving both DC and AC setting resistor on the inverting input can combine with performance, provided that the nulling circuitry is the input capacitance to form a pole which can cause removed. The suggested nulling circuit for the LT1357 is peaking or oscillations. For feedback resistors greater shown below. than 5kΩ, a parallel capacitor of value
Offset Nulling
CF > (RG • CIN)/RF V+ should be used to cancel the input pole and optimize 3 7 + dynamic performance. For unity-gain applications where 6 LT1357 a large feedback resistor is used, C 4 F should be greater 2 – 8 than or equal to CIN. 1 10k
Capacitive Loading
V– The LT1357 is stable with any capacitive load. This is 1357 AI01 accomplished by sensing the load induced output pole and
Layout and Passive Components
adding compensation at the amplifier gain node. As the capacitive load increases, both the bandwidth and phase The LT1357 amplifier is easy to apply and tolerant of less margin decrease so there will be peaking in the frequency than ideal layouts. For maximum performance (for domain and in the transient response as shown in the example, fast settling time) use a ground plane, short lead typical performance curves.The photo of the small-signal lengths and RF-quality bypass capacitors (0.01µF to 0.1µF). response with 1000pF load shows 50% peaking. The For high drive current applications use low ESR bypass large-signal response with a 10,000pF load shows the capacitors (1µF to 10µF tantalum). Sockets should be output slew rate being limited to 5V/µs by the short-circuit avoided when maximum frequency performance is current. Coaxial cable can be driven directly, but for best required, although low profile sockets can provide pulse fidelity a resistor of value equal to the characteristic reasonable performance up to 50MHz. For more details impedance of the cable (i.e., 75Ω) should be placed in see Design Note 50. 9