Describe the features of the LM134/LM234/LM334 that are 3-terminal adjustable current sources:
-10000 operatingcurrent range: 1
- an excellent current regulation
- Wide dynamic voltage range from 1V to 40V

is present by an external resistor without the need for other external components. Currents with reverse voltages up to 20V will only draw a few microamps. This makes the circuit tooperate asa rectifierandas a source of current applied in ac. For the LM134/LM234/LM334, the voltage on the control pin is 64mV at +25 oC, which is proportional to
to the absolutetemperature (OK). The easiest way to connect an external resistor to generate the current
Temperature dependence of 90.33%/oC. Zero drift can be obtained by adding anadditionalresistor and diodes to external circuits.

Application Tips

The slew rate at the slew rate exceeds a threshold (see curve) LM134, LM234, LM334 can have a non-linear current characteristic. The conversion speed atwhich this takes place is proportional to the stability unaffected. Maximum value of dv/dt at ISET = 10mA. = 0.01V/mS; max dv/dt at ISET = 1mA. = 1V/mS. Slew rates more than 1V/mS do not damage the circuit nor generate large currents. Thermal effects Internal heating can not affect the stability of the current significant effect protocol above 100mA. For example, each increase in voltage of 1V across the LM134 at ISET = 1mA will increase the circuit temperatureby
9 0.4oC (in still air). The output current (ISET) has a temperature coefficient of approximately 0.33%/°C. Therefore, the change present due to the increase in temperaturewill be (0.4)(0.33) = 0.132%. This is 10 degradation: 1 with true electrical effects. Thermal effects should be taken into account when SAR regulation is critical with ISET higher than 100mA. The elimination of connectionsof the CB-97 package can reduce this thermal effect by a factor of more than 3.

Shunt Capacitance In some applications, the value of the shunt capacitor should be reduced by 15pF:
- because of loading problems,
- The current source is applied in ac due to the limitation of output impedance. This reduced capacitance can easily be added to the FET as indicatein thetypical applications. This capacitance value can be reduced at least 3pF in regulation which can improve the order ofmagnitudewithout anymodificationof the SAR characteristics (except for the minimum input voltage).

Noise current noise LM134, LM234 made, LM334 about 4 times the transistor. If LM134, LM234, LM334 are used as the active load of a transistor amplifier, the input noise increases by about 12dB. In most cases this is acceptable, and an amplifier can be built with a higher voltage gain than 2000.