DC1698A-C

DC1698A-C demonstration circuit features the LT1999, a high voltage, bi-directional current sense amplifier. The demo board amplifies the voltage drop across an on-board current sense resistor. The output voltage is a bidirectional signal that is centred on the VREF voltage and is proportional to the current through the sense resistor. The output is scaled by 50V/V gain. The input voltage range is from –5V to 80V (independent of the device supply voltage) allowing the part to be used for high or low side current sensing. The LT1999 requires a separate 5V supply voltage.

• 4.5V to 5.5V supply range
• 100dB common mode rejection ratio (VCM = 0V, 7VP-P, f = 100KHz)
• 550μV typical input referred offset voltage at TA = 25°C, VCM > 5.5V
• 1.55mA typical V+ quiescent current at VCM > 5.5V
• 2.5V typical open circuit voltage
• 1.25 to V+ – 1.5V REF pin input range