ISL21009BMB825EP

® ISL21009MEP Data Sheet December 15, 2008 FN6744.0 High Voltage Input Precision, Low Noise FGA™ Voltage References The ISL21009MEP FGA™ voltage references are extremely low power, high precision, and low noise voltage references fabricated on Intersil’s proprietary Floating Gate Analog technology. The ISL21009MEP features very low noise (4.5µVP-P for 0.1Hz to 10Hz), low operating current (180µA, Max), and 3ppm/°C of temperature drift. In addition, the ISL21009 family features guaranteed initial accuracy as low as ±0.5mV. This combination of high initial accuracy, low power and low output noise performance of the ISL21009MEP enables versatile high performance control and data acquisition applications with low power consumption. Features • Specifications per DSCC VID V62/08629 • Full Mil-Temp Electrical Performance from -55°C to +125°C • Controlled Baseline with One Wafer Fabrication Site and One Assembly/Test Site • Full Homogeneous Lot Processing in Wafer Fab • No Combination of Wafer Fabrication Lots in Assembly • Full Traceability Through Assembly and Test by Date/Trace Code Assignment • Enhanced Process Change Notification • Enhanced Obsolescence Management • Eliminates Need for Up-Screening a COTS Component • Output Voltages . . . . . . . . . . . . . . 2.500V, 4.096V, 5.000V • Initial Accuracy . . . . . . . . . . . . . . . . . . . . .±0.5mV, ±1.0mV • Input Voltage Range. . . . . . . . . . . . . . . . . . . 3.5V to 16.5V • Output Voltage Noise . . . . . . . . .4.5µVP-P (0.1Hz to 10Hz) • Supply Current . . . . . . . . . . . . . . . . . . . . . . . .180µA (Max) • Temperature Coefficient . . . . . . . . . . . . 3ppm/°C, 5ppm/°C Device Information The specifications for an Enhanced Product (EP) device are defined in a Vendor Item Drawing (VID), which is controlled by the Defense Supply Center in Columbus (DSCC). “Hot-links” to the applicable VID and other supporting application information are provided on our website. Available Options VOUT OPTION (V) 2.500 2.500 4.096 5.000 5.000 INITIAL ACCURACY (mV) ±0.5 ±1.0 ±0.5 ±0.5 ±1.0 TEMPCO. (ppm/°C) 3 5 3 3 5 • Output Current Capability. . . . . . . . . . . . . . . Up to ±7.0mA • Operating Temperature Range. . . . . . . . . -55°C to +125°C • Package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Ld SOIC PART NUMBER ISL21009BMB825EP ISL21009CMB825EP ISL21009BMB841EP ISL21009BMB850EP ISL21009CMB850EP Applications • Defense/Commercial Avionics • Radar/Sonar Systems • Signal Processing Applications Pinout ISL21009MEP (8 LD SOIC) TOP VIEW GND or NC 1 VIN 2 DNC 3 GND 4 8 DNC 7 DNC 6 VOUT 5 TRIM or NC 1 CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures. 1-888-INTERSIL or 1-888-468-3774 | Intersil (and design) is a registered trademark of Intersil Americas Inc. FGA is a trademark of Intersil Corporation. Copyright Intersil Americas Inc. 2008. All Rights Reserved All other trademarks mentioned are the property of their respective owners. ISL21009MEP Pin Descriptions PIN NUMBER 1 2 4 5 6 3, 7, 8 PIN NAME GND or NC VIN GND TRIM VOUT DNC DESCRIPTION Can be either Ground or No Connect Power supply input connection Ground connection Allows user trim typically ±2.5%. Leave unconnected when unused. Voltage reference output connection Do Not Connect; Internal connection – must be left floating Ordering Information PART NUMBER (Note 1) ISL21009BMB825EP ISL21009CMB825EP ISL21009BMB841EP ISL21009BMB850EP ISL21009CMB850EP NOTE: 1. Add “-TK” suffix for tape and reel. Please refer to TB347 for details on reel specifications. PART MARKING 21009BM 25EP 21009CM 25EP 21009BM 41EP 21009BM 50EP 21009CM 50EP VOUT OPTION (V) 2.500 2.500 4.096 5.000 5.000 GRADE ±0.5mV, 3ppm/°C ±1.0mV, 5ppm/°C ±0.5mV, 3ppm/°C ±0.5mV, 3ppm/°C ±1.0mV, 5ppm/°C TEMP. RANGE (°C) -55 to +125 -55 to +125 -55 to +125 -55 to +125 -55 to +125 PACKAGE 8 Ld SOIC 8 Ld SOIC 8 Ld SOIC 8 Ld SOIC 8 Ld SOIC PKG. DWG. # M8.15 M8.15 M8.15 M8.15 M8.15 1 +5V C1 10µF 2 3 4 GND VIN NC GND ISL21009-25EP NC NC VOUT NC 8 7 6 5 SPI BUS X79000 1 2 3 4 5 6 7 8 9 10 SCK A0 A1 A2 SI SO RDY UP DOWN OE CS CLR VCC VH VL VREF VSS VOUT VBUF VFB 20 19 18 17 16 15 14 13 12 11 LOW NOISE DAC OUTPUT C1 0.001µF FIGURE 1. TYPICAL APPLICATION PRECISION 12-BIT SUB-RANGING DAC 2 FN6744.0 December 15, 2008 ISL21009MEP Typical Performance Curves (ISL21009-25EP) (REXT = 100kΩ) 140 UNIT 1 120 100 IIN (µA) 80 60 40 20 0 3.5 5.5 7.5 9.5 VIN (V) 11.5 13.5 15.5 80 3.5 5.5 7.5 9.5 VIN (V) 11.5 13.5 15.5 UNIT 3 IIN (µA) 110 UNIT 2 +25°C +125°C 120 100 -40°C 90 FIGURE 2. IIN vs VIN, 3 UNITS FIGURE 3. IIN vs VIN, 3 TEMPERATURES VOUT (V) (NORMALIZED TO 2.50V AT VIN = 5V) 2.50010 2.50005 2.50000 UNIT 1 2.49995 2.49990 2.49985 2.49980 3.50 UNIT 3 ΔVOUT (mV) NORMALIZED TO VIN = 5.5V UNIT 2 100 -55°C 50 0 -50 -100 -150 -200 3.5 +25°C +125°C 5.50 7.50 9.50 11.5 VIN (V) 13.5 15.5 5.5 7.5 9.5 VIN (V) 11.5 13.5 15.5 FIGURE 4. LINE REGULATION FIGURE 5. LINE REGULATION OVER-TEMPERATURE 0.1 ΔVOUT (mV) NORMALIZED TO VIN = 5.5V 0.05 +125°C 2.5002 2.5001 2.5000 VOUT (V) UNIT 3 0 -0.05 -0.1 -0.15 -7 +25°C 2.4999 2.4998 2.4997 2.4996 -55°C 2.4995 2.4994 UNIT 2 UNIT 1 -5 SINKING -3 -1 1 3 5 SOURCING 7 2.4993 -40 -20 0 20 40 60 80 100 120 140 OUTPUT CURRENT (mA) TEMPERATURE (°C) FIGURE 6. LOAD REGULATION FIGURE 7. VOUT vs TEMPERATURE 3 FN6744.0 December 15, 2008 ISL21009MEP Typical Performance Curves (ISL21009-25EP) (REXT = 100kΩ) 0 -10 -20 -30 PSRR (dB) -40 -50 -60 -70 -80 -90 -100 1 10 100 1k 10k 100k 1M 10M 100nF 10nF 1nF 500kHz PEAK VIN (DC) = 10V NO LOAD (Continued) FREQUENCY (Hz) FIGURE 8. PSRR AT DIFFERENT CAPACITIVE LOADS FIGURE 9. LINE TRANSIENT RESPONSE, NO CAPACITIVE LOAD 5.2 4.8 4.4 4.0 3.6 3.2 2.8 2.4 2.0 1.6 1.2 0.8 0.4 0 0 VIN HIGH IIN VIN AND VOUT (V) MEDIUM IIN LOW IIN 0.05 0.10 0.15 0.20 TIME (ms) 0.25 0.30 0.35 0.40 FIGURE 10. LINE TRANSIENT RESPONSE, 0.001µF LOAD CAPACITANCE FIGURE 11. TURN-ON TIME 160 140 120 ZOUT (Ω) 100 80 60 40 20 0 1 10 100 1k 10k FREQUENCY (Hz) 100k 1M 1nF NO LOAD 100nF 2mV/DIV 10nF GAIN IS x1000, NOISE IS 4.5µVP-P FIGURE 12. ZOUT vs FREQUENCY FIGURE 13. VOUT NOISE, 0.1Hz TO 10Hz 4 FN6744.0 December 15, 2008 ISL21009MEP Typical Performance Curves (ISL21009-25EP) (REXT = 100kΩ) NO OUTPUT CAPACITANCE (Continued) NO OUTPUT CAPACITANCE 7mA +50µA -50µA -7mA FIGURE 14. LOAD TRANSIENT RESPONSE FIGURE 15. LOAD TRANSIENT RESPONSE Typical Performance Curves (ISL21009-41EP) (REXT = 100kΩ) 110 105 95 100 IIN (µA) IIN (µA) UNIT 3 95 UNIT 2 90 UNIT 1 85 80 5 7 9 11 VIN (V) 13 15 17 80 5 7 9 11 VIN (V) 13 15 17 85 90 +125°C -40°C +25°C 100 FIGURE 16. IIN vs VIN, 3 UNITS FIGURE 17. IIN vs VIN, 3 TEMPERATURES VOUT (V) NORMALIZED TO 4.096V AT VIN = 5.0V 4.0963 4.0962 4.0962 4.0961 4.0961 4.0960 4.0960 4.0959 4.0959 4.0958 4.50 6.50 8.50 10.5 VIN (V) 12.5 14.5 16.5 UNIT 3 UNIT 1 UNIT 2 ΔVOUT (mV) NORMALIZED TO VIN = 5.5V 200 150 100 50 0 -50 +125°C 6.5 8.5 10.5 VIN (V) 12.5 14.5 16.5 -55°C +25°C -100 4.5 FIGURE 18. LINE REGULATION, 3 UNITS FIGURE 19. LINE REGULATION OVER-TEMPERATURE 5 FN6744.0 December 15, 2008 ISL21009MEP Typical Performance Curves (ISL21009-41EP) (REXT = 100kΩ) 0.5 0.4 0.3 0.2 0.1 0.0 -0.1 -0.2 -7 +125°C -6 -5 -4 -3 -2 -1 0 1 2 SINKING OUTPUT CURRENT (mA) -55°C 3 4 5 6 7 SOURCING +25°C VOUT (V) NORMALIZED TO 4.096V 0.6 ΔVOUT (mV) NORMALIZED TO VIN = 5.5V 4.0970 4.0965 4.0960 UNIT 2 4.0955 UNIT 3 4.0950 4.0945 -40 UNIT 1 -25 -10 5 20 35 50 65 80 95 110 125 (Continued) TEMPERATURE (°C) FIGURE 20. LOAD REGULATION FIGURE 21. VOUT vs TEMPERATURE 0 -10 -20 PSRR (dB) -30 -40 -50 -60 -70 1nF LOAD -80 1 10 100 1k 10k 100k 1M 10M FREQUENCY (Hz) X = 10µs/DIV Y = 200mV/DIV 10nF LOAD VIN (DC) = 5V VIN (AC) RIPPLE = 50mVP-P NO LOAD 100nF LOAD FIGURE 22. PSRR AT DIFFERENT CAPACITIVE LOADS FIGURE 23. LINE TRANSIENT RESPONSE, NO CAPACITIVE LOAD VIN VREF X = 10µs/DIV Y = 200mV/DIV X = 50µs/DIV Y = 2V/DIV FIGURE 24. LINE TRANSIENT RESPONSE, 0.001µF LOAD CAPACITANCE FIGURE 25. TURN-ON TIME 6 FN6744.0 December 15, 2008 ISL21009MEP Typical Performance Curves (ISL21009-41EP) (REXT = 100kΩ) 200 180 160 140 ZOUT ( Ω) 120 100 80 60 40 20 0 1 10 100 1k 10k 100k 1M 10M 1s/DIV FREQUENCY (Hz) 10nF LOAD NO LOAD 1nF LOAD 20mV/DIV (Continued) GAIN IS x10,000 NOISE IS 4.5µVP-P FIGURE 26. ZOUT vs FREQUENCY FIGURE 27. VOUT NOISE, 0.1Hz TO 10Hz 7mA +50µA -50µA -7mA NO OUTPUT CAPACITANCE X = 5µs/DIV Y = 50mV/DIV NO OUTPUT CAPACITANCE X = 5µs/DIV Y = 500mA/DIV FIGURE 28. LOAD TRANSIENT RESPONSE FIGURE 29. LOAD TRANSIENT RESPONSE 7 FN6744.0 December 15, 2008 ISL21009MEP Typical Performance Curves (ISL21009-50EP) (REXT = 100kΩ) 140 UNIT3 120 100 IIN (µA) 80 60 40 20 0 5.50 6.50 7.50 8.50 9.50 10.5 11.5 12.5 13.5 14.5 15.5 16.5 VIN (V) 80 5.50 6.50 7.50 8.50 9.50 10.5 11.5 12.5 13.5 14.5 15.5 16.5 VIN (V) UNIT1 IIN (µA) UNIT2 110 +25°C 100 +125°C 90 -40°C FIGURE 30. IIN vs VIN, 3 UNITS FIGURE 31. IIN vs VIN, 3 TEMPERATURES VOUT (V) (NORMALIZED TO 5.0V AT VIN = 10V) 5.0001 ΔVOUT (mV) NORMALIZED TO VIN = 5.5V 5.0000 4.9999 4.9998 UNIT2 4.9997 4.9996 4.9995 UNIT1 UNIT3 100 50 0 -50 -100 -150 -200 -250 -300 -350 -400 5.5 6.5 7.5 8.5 9.5 10.5 11.5 12.5 13.5 14.5 15.5 16.5 VIN (V) +25°C -55°C +125°C 4.9994 5.50 6.50 7.50 8.50 9.50 10.5 11.5 12.5 13.5 14.5 15.5 16.5 VIN (V) FIGURE 32. LINE REGULATION FIGURE 33. LINE REGULATION OVER-TEMPERATURE 0.10 ΔVOUT (mV) NORMALIZED TO VIN = 5.5V 0.05 0 +25°C -55°C +125°C -0.05 -0.10 -0.15 -0.20 -7 -6 -5 -4 -3 -2 -1 0 1 2 3 4 5 6 7 SINKING OUTPUT CURRENT (mA) SOURCING FIGURE 34. LOAD REGULATION 8 FN6744.0 December 15, 2008 ISL21009MEP Typical Performance Curves (ISL21009-50EP) (REXT = 100kΩ) 5.001 NORMALIZED TO +25°C 5.001 PSRR (dB) 5.000 VOUT (V) UNIT 2 5.000 4.999 4.999 4.998 -40 UNIT 3 -20 0 20 40 60 80 100 120 140 UNIT 1 0 -10 -20 -30 -40 -50 -60 -70 -80 -90 -100 1 10 100 1k 10k 100k 1M 10M 100nF 1nF 10nF VIN (DC) = 10V VIN (AC) RIPPLE = 50mVP-P NO LOAD (Continued) TEMPERATURE (°C) FREQUENCY (Hz) FIGURE 35. VOUT vs TEMPERATURE FIGURE 36. PSRR AT DIFFERENT CAPACITIVE LOADS VIN = 10V DVIN = 1V VIN = 10V DVIN = 1V FIGURE 37. LINE TRANSIENT RESPONSE, NO CAPACITIVE LOAD FIGURE 38. LINE TRANSIENT RESPONSE, 0.001µF LOAD CAPACITANCE 12 VIN (V) AND VOUT (V) 10 8 6 4 2 0 0 270nA 50 VIN ZOUT (W) 450nA 120 1nF 100 80 60 NO LOAD 40 340nA 100 150 TIME (µs) 200 250 300 20 0 1 10 100 1k 10k 100k 1M FREQUENCY (Hz) 10nF FIGURE 39. TURN-ON TIME FIGURE 40. ZOUT vs FREQUENCY 9 FN6744.0 December 15, 2008 ISL21009MEP Typical Performance Curves (ISL21009-50EP) (REXT = 100kΩ) GAIN IS x1000 NOISE IS 4.5µVP-P (Continued) 50µA 2mV/DIV -50µA FIGURE 41. VOUT NOISE, 0.1Hz TO 10Hz FIGURE 42. LOAD TRANSIENT RESPONSE 7mA -7mA FIGURE 43. LOAD TRANSIENT RESPONSE Applications Information FGA Technology The ISL21009MEP voltage reference uses floating gate technology to create references with very low drift and supply current. Essentially the charge stored on a floating gate cell is set precisely in manufacturing. The reference voltage output itself is a buffered version of the floating gate voltage. The resulting reference device has excellent characteristics, which are unique in the industry: very low temperature drift, high initial accuracy, and almost zero supply current. Also, the reference voltage itself is not limited by voltage bandgaps or zener settings, so a wide range of reference voltages can be programmed (standard voltage settings are provided, but customer-specific voltages are available). The process used for these reference devices is a floating gate CMOS process and the amplifier circuitry uses CMOS transistors for amplifier and output transistor circuitry. While 10 providing excellent accuracy, there are limitations in output noise level and load regulation due to the MOS device characteristics. These limitations are addressed with circuit techniques discussed in other sections. Micropower Operation The ISL21009MEP consumes extremely low supply current due to the proprietary FGA technology. Low noise performance is achieved using optimized biasing techniques. Supply current is typically 95µA and noise is 4.5µVP-P benefitting precision, low noise portable applications such as handheld meters and instruments. Data Converters in particular can utilize the ISL21009MEP as an external voltage reference. Low power DAC and ADC circuits will realize maximum resolution with lowest noise. FN6744.0 December 15, 2008 ISL21009MEP Board Mounting Considerations For applications requiring the highest accuracy, board mounting location should be reviewed. The device uses a plastic SOIC package, which will subject the die to mild stresses when the PC board is heated and cooled, slightly changing the shape. Placing the device in areas subject to slight twisting can cause degradation of the accuracy of the reference voltage due to these die stresses. It is normally best to place the device near the edge of a board, or the shortest side, as the axis of bending is most limited at that location. Mounting the device in a cutout also minimizes flex. Obviously mounting the device on flexprint or extremely thin PC material will likewise cause loss of reference accuracy. Turn-On Time The ISL21009MEP devices have low supply current and thus the time to bias up internal circuitry to final values will be longer than with higher power references. Normal turn-on time is typically 100µs. This is shown in Figure 11. Circuit design must take this into account when looking at power-up delays or sequencing. Temperature Coefficient The limits stated for temperature coefficient (tempco) are governed by the method of measurement. The overwhelming standard for specifying the temperature drift of a reference is to measure the reference voltage at two temperatures, take the total variation, (VHIGH – VLOW), and divide by the temperature extremes of measurement (THIGH – TLOW). The result is divided by the nominal reference voltage (at T = +25°C) and multiplied by 106 to yield ppm/°C. This is the “Box” method for specifying temperature coefficient. Noise Performance and Reduction The output noise voltage in a 0.1Hz to 10Hz bandwidth is typically 4.5µVP-P. The noise measurement is made with a bandpass filter made of a 1-pole high-pass filter with a corner frequency at 0.1Hz and a 2-pole low-pass filter with a corner frequency at 12.6Hz to create a filter with a 9.9Hz bandwidth. Noise in the 10kHz to 1MHz bandwidth is approximately 40µVP-P with no capacitance on the output. This noise measurement is made with a 2 decade bandpass filter made of a 1-pole high-pass filter with a corner frequency at 1/10 of the center frequency and 1-pole low-pass filter with a corner frequency at 10x the center frequency. Load capacitance up to 1000pF can be added but will result in only marginal improvements in output noise and transient response. The output stage of the ISL21009MEP is not designed to drive heavily capactive loads, so for load capacitances above 0.001µF, the noise reduction network shown in Figure 44 is recommended. This network reduces noise significantly over the full bandwidth. Noise is reduced to less than 20µVP-P from 1Hz to 1MHz using this network with a 0.01µF capacitor and a 2kΩ resistor in series with a 10µF capacitor. Also, transient response is improved with higher value output capacitor. The 0.01µF value can be increased for better load transient response with little sacrifice in output stability. . Output Voltage Adjustment The output voltage can be adjusted up or down by 2.5% by placing a potentiometer from VOUT to GND and connecting the wiper to the TRIM pin. The TRIM input is high impedance so no series resistance is needed. The resistor in the potentiometer should be a low tempco (