Datasheet LT1193 (Analog Devices) - 9

LT1193
U U W U APPLICATIO S I FOR ATIO Closed-Loop Voltage Gain vs Frequency Small-Signal Transient Response
25 VS = ±5V AV = 10 TA = 25°C A 15 V = 5 AV = 3 AV = 2 5 CLOSED-LOOP VOLTAGE GAIN (dB) –5 100k 1M 10M 100M LT1193 • TA10 FREQUENCY (Hz) AV = 2 WITH 8pF FEEDBACK CAPACITOR LT1193 • TA07 RISE TIME = 3.75ns, RFB = 1k, RG = 1k
Closed-Loop Voltage Gain vs Frequency Double Terminated Cable Driver
10 VS = ±5V 5V 3 T + A = 25°C 7 CFB = 0pF 2 – 75Ω CABLE 8 AV = 2 6 R C LT1193 1 FB = 300Ω FB = 5pF + R 8 G = 300Ω – 4 75Ω 6 –5V CFB = 10pF R R G FB C 4 FB = 15pF CFB 2
Closed-Loop Voltage Gain vs Frequency
CLOSED-LOOP VOLTAGE GAIN (dB) 8 0 100k 1M 10M 100M 6 FREQUENCY (Hz) AV = 2 LT1193 • TA08 4 RFB = 300Ω RG = 100Ω
Small-Signal Transient Response
C 2 FB = 0pF 0 AV = 1 R –2 FB = 300Ω RG = 300Ω CFB = 10pF CLOSED LOOP VOLTAGE GAIN (dB) –4 –6 100k 1M 10M 100M FREQUENCY (Hz) LT1193 • TA11 When driving a cable it is important to terminate the cable to avoid unwanted reflections. This can be done in one of two ways: single termination or double termination. With LT1193 • TA09 single termination, the cable must be terminated at the AV = 2, OVERSHOOT = 40%, RFB = 1k, RG = 1k receiving end (75Ω to ground) to absorb unwanted en- 100Ω, while operating on ±5V supplies and gains > 3. On ergy. The best performance can be obtained by double a single 5V supply, the LT1193 can swing 2.6VP-P for termination (75Ω in series with the output of the amplifier, gains ≥ 2. and 75Ω to ground at the other end of the cable). This 1193fb 9