LOW-NOISE/ HIGH-SPEED CURRENT FEEDBACK AMPLIFIERS
Description
THS3112 THS3115
SLOS385 – SEPTEMBER 2001
LOW-NOISE, HIGH-SPEED CURRENT FEEDBACK AMPLIFIERS
FEATURES D Low Noise APPLICATIONS D Communication Equipment D Video Distribution D Motor Drivers D Piezo Drivers DESCRIPTION
The THS3112/5 are low-noise, high-speed current feedback amplifiers, ideal for any application requiring high output current.
The low noninverting current noise of 2.
9 pA/√Hz and the low inverting current noise of 10.
8 pA/√Hz increase signal to noise ratios for enhanced signal resolution.
The THS3112/5 can operate from ±5-V to ±15-V supply voltages, while drawing as little as 4.
5 mA of supply current per channel.
It offers low –78-dBc total harmonic distortion driving 2 VPP into a 100-Ω load.
The THS3115 features a low power shutdown mode, consuming only 300-µA shutdown quiescent current per channel.
The THS3112/5 is packaged in a standard SOIC, SOIC PowerPAD, and TSSOP PowerPAD packages.
D D D D D D D D D
– 2.
9 pA/√Hz Noninverting Current Noise – 10.
8 pA/√Hz Inverting Current Noise – 2.
2 nV/√Hz Voltage Noise Wide Supply Voltage Range ± 5 V to ± 15 V Wide Output Swing – 25 VPP Output Voltage, RL = 100 Ω, ± 15-V Supply High Output Current, 150 mA (Min) High Speed – 110 MHz (–3 dB, G=1, ± 15 V) – 1550 V/µs Slew Rate (G = 2, ± 15 V) Low Distortion, G = 2 – -78 dBc (1 MHz, 2 VPP, 100-Ω load) Low Power Shutdown (THS3115) – 300-µA Shutdown Quiescent Current Per Channel Thermal Shutdown and Short Circuit Protection Standard SOIC, SOIC PowerPAD, and TSSOP PowerPAD Package Evaluation Module Available
VOLTAGE NOISE AND CURRENT NOISE vs FREQUENCY
100 V n – Voltage Noise – nV/ Hz I n – Current Noise – pA/ Hz VCC = ±5 V to ±15 V TA = 25°C In–
THS3112 SOIC (D) AND SOIC PowerPAD (DDA) PACKAGE (TOP VIEW)
THS3115 SOIC (D) AND TSSOP PowerPAD (PWP) PACKAGE (TOP VIEW)
10
In+
1 OUT 1 IN– 1 IN+ VCC–
1 2 3 4
8 7 6 5
VCC+ 2 OUT 2 IN– 2 IN+
Vn
1 OUT 1 IN– 1 IN+ VCC– N/C GND N/C
1 2 3 4 5 6 7
14 13 12 11 10 9 8
VCC+ 2 OUT 2 IN– 2 IN+ N/C SHUTDOWN N/C
1 10 ...
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