Obsolescence Notice This product is obsolete. This information is available for your convenience only. For more information on Zarlink’s obsolete products and replacement product lists, please visit http://products.zarlink.com/obsolete_products/ DS3030 - 2.1 ZN404 / ZN404D 2.45V PRECISION REFERENCE REGULATOR The ZN404 is a monolithic integrated circuit providing a precise stable reference source of 2.45V without the need for an external shaping capacitor. VREF FEATURES ■ ■ ■ ■ ■ ■ ■ ■ Low Temperature Coefficient Low Slope Resistance Very Good Long Term Stability Low Noise Internally Shaped Tight Tolerance ZN404 - 2-Lead TO-18 Metal Can Package ZN404D - 8-Lead Miniature Plastic Surface Mount Package ZN404 (CM2) - BOTTOM VIEW NC 1 8 VREF NC 2 7 NC NC 3 6 NC GND 4 5 NC VS VS - VREF R= IREF GND ZN404D (MP8) - TOP VIEW R VREF +VE Fig.1 Pin connections ORDERING INFORMATION AV Device BAND GAP REFERENCE -VE Fig.2 Circuit diagram GND Operating Temperature Package ZN404 -20°C to +70°C CM2 ZN404D -20°C to +70°C MP8 ABSOLUTE MAXIMUM RATINGS Dissipation Operating temperature range ZN404 ZN404D Storage temperature range 300mW -20°C to +70°C -20°C to +70°C -55°C to +125°C ZN404 ELECTRICAL CHARACTERISTICS (at Tamb = 25°C unless otherwise specified) Symbol Min. Typ. Max. Units Output voltage VREF 2.38 2.45 2.52 V Slope resistance RREF - 0.1 0.2 Ω Reference current IREF 2.0 - 120 mA ∆VREF - 6 33 mV -20 to +70°C RMS noise voltage 1Hz-10kHz 10 - µV 1kHz - 10kHz VREF drift at 70°C ±10 - ppm/1000 hours CM2 Package Parameter Maximum change in VREF Measured at 2mA DYNAMIC IMPEDANCE (ohms) 10 IREF = 2mA 1.0 IREF = 20mA 0.1 0.1 1.0 10 FREQUENCY (kHz) Fig.3 Dynamic impedance 2 Test conditions 100 ZN404 10 CHANGE IN REFERENCE VOLTAGE, δV (mV) 8 FORWARD CURRENT (A) 10-1 10-2 10-3 10-4 0.4 0.8 1.2 1.6 2.0 2.4 FORWARD VOLTAGE (V) 6 4 2 0 -2 -4 -6 -8 -10 2.8 Fig.4 Forward characteristic (typical) 0 10 20 30 40 50 60 TEMPERATURE (°C) 70 80 Fig.5 Temperature characteristic (typical) 140 120 100 IREF (MAX) (mA) 80 75 60 40 20 0 0 10 20 25 30 40 50 60 70 AMBIENT TEMPERATURE (°C) Fig.6 Derating curve 3