AS1004 Precision Voltage Reference FEATURES APPLICATIONS • Initial Voltage Tolerance ............................................ 1004-1.2 ,±4mV • Low Dynamic Impedance ................................................. 0.6 Ω Max. • Low Operating Current .............................................. 1004-1.2, 10µA • Wide Operating Current Range .....................................10µA to 20mA • Direct Replacement for LT1004 & LM1004 • A/D and D/A Reference • Reference for 5V Systems • Digital Voltmeter • Power Supply Monitor PRODUCT DESCRIPTION The AS1004 is a 2-terminal band-gap precision voltage reference which provides a stable fixed output voltage of 1.2. The AS1004 can be used as a pin-to-pin replacement of the LT1004 and LM1004. The AS1004 is available in packages SOIC-8, TO92 and Die at the operating temperature range of 0°C to 70°C. ORDERING INFORMATION Part Number MAX TEMPCO1 ppm/°C Package Type Oper. Temp. Range AS1004S 25 SO-8 COM AS1004N 25 TO-92 COM PIN CONNECTIONS SOIC (S) Alternate Pin Out N/C 1 N/C 2 N/C ANODE AS1004 8 CATHODE 7 N/C SOIC (S) N/C 3 6 CATHODE 4 5 N/C Top View TO-92 (N) N/C ANODE N/C N/C CATHODE AS1004 ANODE N/C CATHODE ANODE CATHODE Bottom View Top View Rev. 10/17/00 AS1004 ABSOLUTE MAXIMUM RATINGS Forward Current……………………………………….……… 30 mA Reverse Current………………………………………….……. 30 mA Maximum Junction Temp……………………….…………….. 150°C Storage Temperature Range…………………………. -65°C to 150°C Lead Temperature Range (10 Sec.)………………………….. +300°C TYPICAL THERMAL RESISTANCES Package TO-92 8L SOIC θJC 80 °C/W 45 °C/W θJA 160 °C/W 175 °C/W Typical Derating 6.3 mW/°C 5.7 mW/°C ELECTRICAL CHARACTERISTICS Electrical Characteristics are guaranteed over full junction temperature range (0°C to 70°C). Ambient temperature must be derated based on power dissipation and package thermal characteristics. AS1004-1.2V Parameter Test Conditions Min. Typ. Max. Units Reverse Breakdown Voltage 1.231 1.235 1.239 V IZ = 100 µA, TJ = 25 °C 1.225 1.235 1.245 V 0 °C < TA < 70 °C Average Temperature Imin < IZ < 20 mA 20 ppm/°C Coefficient Minimum Operating Current 4 10 µA Reverse Breakdown Voltage Imin < IZ < 1 mA 0.5 1 mV Change With Current Over Temperature 0.5 1.5 mV 1 mA < IZ < 20 mA 6.5 10 mV Over Temperature 6.5 20 mV Reverse Dynamic Impedance IZ = 100 mA, f = 25 Hz 0.2 0.6 Ω Over Temperature 1 1.5 Ω Wide Band Noise IZ = 100 µA 10 Hz < f < 10 KHz 60 µV Long Term Stability IZ = 100 µA 20 ppm/kH TA = 25 °C + 0.1 °C Typical Performance Curves 0 1.245 ∆T -5 5000 0.5 -10 0 10 20 30 40 50 60 Temperature (°C) 0.025 mV/ °C 70 0.002 %/ °C 20 ppm/ °C Average Temperature Coefficient = Figure 1 IZ = 100 µA 1.240 1.235 1.230 Z 0 AS1004-1.2V Reference Voltage vs. Ambient Temperature V - Reference Voltage (V) 0 mV ppm Calculating Average Temperature Coefficient for the AS1004-1.2V Reference 1.225 -55 -35 -15 ∆V REF ∆T 5 25 45 65 85 105 125 TA - Ambient Temperature (°C) Figure 2 Rev. 10/17/00 AS1004 SIMPLIFIED SCHEMATIC K R2 Q13 Q4 Q12 Q3 C2 R10 Q7 R4 C1 Q11 C3 R11 Q5 Q1 Q10 R12 Q9 Q8 R6 R7 Q6 Q14 A Rev. 10/17/00 AS1004 TYPICAL PERFORMANCE CURVES AS1004-1.2V Reverse Operating Characteristics 100 IR - Reverse Current ( µA) TA = -55 °C to 125 °C 10 1 0.1 0 0.2 0.4 0.6 0.8 1 1.2 1.4 V R - Reverse Voltage (V) Figure 3 Rev. 10/17/00 AS1004 TYPICAL PERFORMANCE CURVES AS1004-1.2V Change in Reference Voltage vs. Reverse Current ∆VZ - Change In Reference Voltage (mA) 16 TA = -55 °C to 125 °C 12 8 4 0 -4 0.01 0.1 1 10 100 IR - Reverse Current (mA) Figure 4 AS1004-1.2V Transient Response 1.5 1 Input and Output Voltage (V) OUTPUT 0.5 VI 36 kΩ VO 0 5 INPUT 0 0 50 100 500 600 t - Time ( µs) Figure 5 Rev. 10/17/00 AS1004 TYPICAL PERFORMANCE CURVES AS1004-1.2V Reverse Dynamic Impedance 10k tZ = 100 µA TA = 25 °C ( ΖZ - Reference ImpedanceΩ) 1k 100 10 1 0.1 0.01 0.1 1 10 100 1k f = Frequency (kHz) Figure 6 Low Frequency Reverse Dynamic Impedance Forward Characteristics 1.2 100 TA = -55 °C to 125 °C f = 25 Hz ZZ - Reference ImpedanceΩ) ( VF - Forward Voltage V () TA = 25 °C 0.8 0.4 0 0.01 0.1 1 10 100 10 1 0.1 0.01 0.1 1 10 IF = Forward Current (mA) IZ = Reverse Current (mA) Figure 7 Figure 8 100 Rev. 10/17/00 AS1004 TYPICAL APPLICATIONS 1.235 Reference VIN 3k OUT AS1004-1.2V Figure 9 Lead Acid Low Battery Detector Micropower 10V Reference VIN = 12V to 20V 86.7 k LO = Battery Low 500 k 7 3 + 6 2 LM4250 8 4 22 M + 12V 500 k 1M - 3.5 M 150 pF 150 pF AS1004-1.2V 500 k AS1004-1.2 Figure 10 Figure 11 Rev. 10/17/00