Datasheet LT1793 (Analog Devices)
| Manufacturer | Analog Devices |
| Description | Low Noise, Picoampere Bias Current, JFET Input Op Amp |
| Pages / Page | 12 / 1 — FEATURES. DESCRIPTIO. Input Bias Current, Warmed Up: 10pA Max. 100% … |
| File Format / Size | PDF / 176 Kb |
| Document Language | English |
FEATURES. DESCRIPTIO. Input Bias Current, Warmed Up: 10pA Max. 100% Tested Low Voltage Noise: 8nV/. Hz Max
Model Line for this Datasheet
Text Version of Document
LT1793 Low Noise, Picoampere Bias Current, JFET Input Op Amp
U FEATURES DESCRIPTIO
■
Input Bias Current, Warmed Up: 10pA Max
The LT®1793 achieves a new standard of excellence in ■
100% Tested Low Voltage Noise: 8nV/
√
Hz Max
noise performance for a JFET op amp. For the first time low ■
A Grade 100% Temperature Tested
voltage noise (6nV/√Hz) is simultaneously offered with ■ Offset Voltage Over Temp: 1mV Max extremely low current noise (0.8fA/√Hz), providing the ■ Input Resistance: 1013Ω lowest total noise for high impedance transducer applica- ■ Very Low Input Capacitance: 1.5pF tions. Unlike most JFET op amps, the very low input bias ■ Voltage Gain: 1 Million Min current (3pA typ) is maintained over the entire common ■ Gain-Bandwidth Product: 4.2MHz Typ mode range which results in an extremely high input resis- ■ Guaranteed Specifications with ±5V Supplies tance (1013Ω). When combined with a very low input ca- pacitance (1.5pF) an extremely high input impedance
U
results, making the LT1793 the first choice for amplifying
APPLICATIO S
low level signals from high impedance transducers. The ■ low input capacitance also assures high gain linearity when Photocurrent Amplifiers ■ buffering AC signals from high impedance transducers. Hydrophone Amplifiers ■ High Sensitivity Piezoelectric Accelerometers The LT1793 is unconditionally stable for gains of 1 or more, ■ Low Voltage and Current Noise Instrumentation even with 1000pF capacitive loads. Other key features are Amplifier Front Ends 250µV VOS and a voltage gain over 4 million. Each indi- ■ Two and Three Op Amp Instrumentation Amplifiers vidual amplifier is 100% tested for voltage noise, slew rate ■ Active Filters (3.4V/µs) and gain-bandwidth product (4.2MHz). , LTC and LT are registered trademarks of Linear Technology Corporation. Specifications at ±5V supply operation are also provided. For an even lower voltage noise please see the LT1792 data sheet.
U TYPICAL APPLICATIO Low Noise Light Sensor with DC Servo
C1
1kHz Output Voltage Noise
2pF
Density vs Source Resistance
10k √Hz) V + R1 – 1M 2 – 7 VN 1k + 6 LT1793 VOUT RSOURCE D2 3 + C2 0.022µF 1N914 4 100 V – V + R2 CD D1 – 100k R3 1N914 10 V 1k N 2N3904 LT1097 SOURCE TA = 25°C + RESISTANCE VS = ±15V HAMAMATSU R5 R4 ONLY TOTAL 1kHz VOLTAGE NOISE DENSITY (nV/ 1 S1336-5BK 10k 1k 100 1k 10k 100k 1M 10M 100M 1G 1793 TA01 (908) 231-0960 R2C2 > C1R1 V – SOURCE RESISTANCE (Ω) CD = PARASITIC PHOTODIODE CAPACITANCE V – V V 2 OUT = 100mV/µWATT FOR 200nm WAVE LENGTH N = √(VOP AMP)2 + 4kTRS + 2qIBRS 330mV/µWATT FOR 633nm WAVE LENGTH 1793 TA02 1
U FEATURES DESCRIPTIO
■
Input Bias Current, Warmed Up: 10pA Max
The LT®1793 achieves a new standard of excellence in ■
100% Tested Low Voltage Noise: 8nV/
√
Hz Max
noise performance for a JFET op amp. For the first time low ■
A Grade 100% Temperature Tested
voltage noise (6nV/√Hz) is simultaneously offered with ■ Offset Voltage Over Temp: 1mV Max extremely low current noise (0.8fA/√Hz), providing the ■ Input Resistance: 1013Ω lowest total noise for high impedance transducer applica- ■ Very Low Input Capacitance: 1.5pF tions. Unlike most JFET op amps, the very low input bias ■ Voltage Gain: 1 Million Min current (3pA typ) is maintained over the entire common ■ Gain-Bandwidth Product: 4.2MHz Typ mode range which results in an extremely high input resis- ■ Guaranteed Specifications with ±5V Supplies tance (1013Ω). When combined with a very low input ca- pacitance (1.5pF) an extremely high input impedance
U
results, making the LT1793 the first choice for amplifying
APPLICATIO S
low level signals from high impedance transducers. The ■ low input capacitance also assures high gain linearity when Photocurrent Amplifiers ■ buffering AC signals from high impedance transducers. Hydrophone Amplifiers ■ High Sensitivity Piezoelectric Accelerometers The LT1793 is unconditionally stable for gains of 1 or more, ■ Low Voltage and Current Noise Instrumentation even with 1000pF capacitive loads. Other key features are Amplifier Front Ends 250µV VOS and a voltage gain over 4 million. Each indi- ■ Two and Three Op Amp Instrumentation Amplifiers vidual amplifier is 100% tested for voltage noise, slew rate ■ Active Filters (3.4V/µs) and gain-bandwidth product (4.2MHz). , LTC and LT are registered trademarks of Linear Technology Corporation. Specifications at ±5V supply operation are also provided. For an even lower voltage noise please see the LT1792 data sheet.
U TYPICAL APPLICATIO Low Noise Light Sensor with DC Servo
C1
1kHz Output Voltage Noise
2pF
Density vs Source Resistance
10k √Hz) V + R1 – 1M 2 – 7 VN 1k + 6 LT1793 VOUT RSOURCE D2 3 + C2 0.022µF 1N914 4 100 V – V + R2 CD D1 – 100k R3 1N914 10 V 1k N 2N3904 LT1097 SOURCE TA = 25°C + RESISTANCE VS = ±15V HAMAMATSU R5 R4 ONLY TOTAL 1kHz VOLTAGE NOISE DENSITY (nV/ 1 S1336-5BK 10k 1k 100 1k 10k 100k 1M 10M 100M 1G 1793 TA01 (908) 231-0960 R2C2 > C1R1 V – SOURCE RESISTANCE (Ω) CD = PARASITIC PHOTODIODE CAPACITANCE V – V V 2 OUT = 100mV/µWATT FOR 200nm WAVE LENGTH N = √(VOP AMP)2 + 4kTRS + 2qIBRS 330mV/µWATT FOR 633nm WAVE LENGTH 1793 TA02 1
