Datasheet LT1169 (Analog Devices) - 7

LT1169
W U TYPICAL PERFOR A CE CHAR C A TERISTICS THD and Noise vs THD and Noise vs Frequency for Noninverting Gain Frequency for Inverting Gain
1 1 Z Z L = 2k15pF L = 2k15pF V V O = 20VP-P O = 20VP-P A A V = 1, 10, 100 V = –1, –10, –100 0.1 MEASUREMENT BANDWIDTH 0.1 MEASUREMENT BANDWIDTH = 10Hz TO 80kHz = 10Hz TO 80kHz A A V = –100 V = 100 0.01 0.01 AV = –10 AV = 10 A 0.001 V = 1 0.001 AV = –1 NOISE FLOOR NOISE FLOOR TOTAL HARMONIC DISTORTION + NOISE (%) TOTAL HARMONIC DISTORTION + NOISE (%) 0.0001 0.0001 20 100 1k 10k 20k 20 100 1k 10k 20k FREQUENCY (Hz) FREQUENCY (Hz) LT1169 • TPC22 LT1169 • TPC23
THD and Noise vs Output THD and Noise vs Output CCIF IMD Test (Equal Amplitude Amplitude for Inverting Gain Amplitude for Noninverting Gain Tones at 13kHz, 14kHz)*
1 1 1 T Z Z A = 25°C L = 2k15pF L = 2k15pF V f f S = ±15V O = 1kHz O = 1kHz R A A L = 2k V = –1, –10, –100 V = 1, 10, 100 0.1 MEASUREMENT BANDWIDTH 0.1 MEASUREMENT BANDWIDTH 0.1 = 10Hz TO 22kHz = 10Hz TO 22kHz AV = 100 AV = ±10 0.01 AV = –100 0.01 0.01 AV = –10 AV = 10 0.001 0.001 AV = 1 0.001 AV = –1 NOISE FLOOR NOISE FLOOR TOTAL HARMONIC DISTORTION + NOISE (%) TOTAL HARMONIC DISTORTION + NOISE (%) 0.0001 0.0001 INTERMODULATION DISTORTION (AT 1kHz)(%) 0.0001 0.3 1 10 30 0.3 1 10 30 0.02 0.1 1 10 30 OUTPUT SWING (V OUTPUT SWING (V P-P) P-P) OUTPUT SWING (VP-P) LT1169 • TPC24 LT1169 • TPC25 LT1169 • TPC26 * SEE LT1115 DATA SHEET FOR DEFINITION OF CCIF TESTING
O U U W U APPLICATI S I FOR ATIO LT1169 vs the Competition
The extremely high input impedance (1013Ω) assures that the input bias current is almost constant over the entire With improved noise performance, the LT1169 dual in the plastic DIP directly replaces such JFET op amps as the common mode range. Figure 1 shows how the LT1169 stands up to the competition. Unlike the competition, as the OPA2111, OPA2604, OP215, and the AD822. The combi- nation of low current and voltage noise of the LT1169 input voltage is swept across the entire common mode range the input bias current of the LT1169 hardly changes. allows it to surpass most dual and single JFET op amps. The LT1169 can replace many of the lowest noise bipolar As a result the current noise does not degrade. This makes the LT1169 the best choice in applications where an amps that are used in amplifying low level signals from high impedance transducers. The best bipolar op amps amplifier has to buffer signals from a high impedance transducer. will eventually lose out to the LT1169 when transducer impedance increases due to higher current noise. 7