ISL219MEP Data Sheet December 15, 28 FN6744. High Voltage Input Precision, Low Noise FGA Voltage References The ISL219MEP FGA voltage references are extremely low power, high precision, and low noise voltage references fabricated on Intersil s proprietary Floating Gate Analog technology. The ISL219MEP features very low noise (4.5µV P-P for.1hz to 1Hz), low operating current (18µA, Max), and 3ppm/ C of temperature drift. In addition, the ISL219 family features guaranteed initial accuracy as low as ±.5mV. This combination of high initial accuracy, low power and low output noise performance of the ISL219MEP enables versatile high performance control and data acquisition applications with low power consumption. 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 PART NUMBER OPTION (V) INITIAL ACCURACY (mv) TEMPCO. (ppm/ C) ISL219BMB825EP 2.5 ±.5 3 ISL219CMB825EP 2.5 ±1. 5 ISL219BMB841EP 4.96 ±.5 3 ISL219BMB85EP 5. ±.5 3 ISL219CMB85EP 5. ±1. 5 Features Specifications per DSCC VID V62/8629 Full Mil-Temp Electrical Performance from -55 C to 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.............. 2.5V, 4.96V, 5.V Initial Accuracy.....................±.5mV, ±1.mV Input Voltage Range................... 3.5V to 16.5V Output Voltage Noise.........4.5µV P-P (.1Hz to 1Hz) Supply Current........................18µA (Max) Temperature Coefficient............ 3ppm/ C, 5ppm/ C Output Current Capability............... Up to ±7.mA Operating Temperature Range.........-55 C to Package.............................. 8 Ld SOIC Applications Defense/Commercial Avionics Radar/Sonar Systems Signal Processing Applications Pinout ISL219MEP (8 LD SOIC) TOP VIEW or NC 1 8 DNC 2 7 DNC DNC 3 6 4 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. 28. All Rights Reserved All other trademarks mentioned are the property of their respective owners.
ISL219MEP Pin Descriptions PIN NUMBER PIN NAME DESCRIPTION 1 or NC Can be either Ground or No Connect 2 Power supply input connection 4 Ground connection 5 TRIM Allows user trim typically ±2.5%. Leave unconnected when unused. 6 Voltage reference output connection 3, 7, 8 DNC Do Not Connect; Internal connection must be left floating Ordering Information PART NUMBER (Note 1) PART MARKING OPTION (V) GRADE TEMP. RANGE ( C) PACKAGE PKG. DWG. # ISL219BMB825EP 219BM 25EP 2.5 ±.5mV, 3ppm/ C -55 to +125 8 Ld SOIC M8.15 ISL219CMB825EP 219CM 25EP 2.5 ±1.mV, 5ppm/ C -55 to +125 8 Ld SOIC M8.15 ISL219BMB841EP 219BM 41EP 4.96 ±.5mV, 3ppm/ C -55 to +125 8 Ld SOIC M8.15 ISL219BMB85EP 219BM 5EP 5. ±.5mV, 3ppm/ C -55 to +125 8 Ld SOIC M8.15 ISL219CMB85EP 219CM 5EP 5. ±1.mV, 5ppm/ C -55 to +125 8 Ld SOIC M8.15 NOTE: 1. Add -TK suffix for tape and reel. Please refer to TB347 for details on reel specifications. +5V C1 1µF 1 2 3 4 NC NC NC NC 8 7 6 5 SPI BUS ISL219-25EP X79 1 2 3 4 5 6 7 8 9 1 SCK A A1 A2 SI SO RDY UP DOWN OE CS CLR V CC VH VL V REF V SS V BUF V FB 2 19 18 17 16 15 14 13 12 11 LOW NOISE DAC OUTPUT C1.1µF FIGURE 1. TYPICAL APPLICATION PRECISION 12-BIT SUB-RANGING DAC 2 FN6744. December 15, 28
ISL219MEP Typical Performance Curves (ISL219-25EP) (R EXT = 1kΩ) 14 12 1 UNIT 1 UNIT 2 12 11 I IN (µa) 8 6 4 2 UNIT 3 I IN (µa) 1 9-4 C 3.5 5.5 7.5 9.5 11.5 13.5 15.5 FIGURE 2. I IN vs, 3 UNITS 8 3.5 5.5 7.5 9.5 11.5 13.5 15.5 FIGURE 3. I IN vs, 3 TEMPERATURES (V) (NORMALIZED TO 2.5V AT = 5V) 2.51 2.55 2.5 2.49995 2.4999 2.49985 UNIT 2 UNIT 1 2.4998 3.5 5.5 7.5 9.5 11.5 13.5 15.5 FIGURE 4. LINE REGULATION UNIT 3 Δ (mv) NORMALIZED TO = 5.5V 1 5-5 -1-15 -55 C -2 3.5 5.5 7.5 9.5 11.5 13.5 15.5 FIGURE 5. LINE REGULATION OVER-TEMPERATURE Δ (mv) NORMALIZED TO = 5.5V.1.5 -.5 -.1-55 C (V) 2.52 2.51 2.5 2.4999 2.4998 2.4997 2.4996 2.4995 2.4994 UNIT 3 UNIT 2 UNIT 1 -.15-7 -5-3 -1 1 3 5 7 SINKING OUTPUT CURRENT (ma) SOURCING 2.4993-4 -2 2 4 6 8 1 12 14 TEMPERATURE ( C) FIGURE 6. LOAD REGULATION FIGURE 7. vs TEMPERATURE 3 FN6744. December 15, 28
ISL219MEP Typical Performance Curves (ISL219-25EP) (R EXT = 1kΩ) (Continued) PSRR (db) 5kHz PEAK -1 V -2 IN (DC) = 1V -3-4 -5-6 -7-8 NO LOAD 1nF 1nF 1nF -9-1 1 1 1 1k 1k 1k 1M 1M FREQUENCY (Hz) FIGURE 8. PSRR AT DIFFERENT CAPACITIVE LOADS FIGURE 9. LINE TRANSIENT RESPONSE, NO CAPACITIVE LOAD AND (V) 5.2 4.8 4.4 4. 3.6 3.2 2.8 2.4 2. 1.6 1.2.8.4 HIGH I IN MEDIUM I IN LOW I IN.5.1.15.2.25.3.35.4 TIME (ms) FIGURE 1. LINE TRANSIENT RESPONSE,.1µF LOAD CAPACITANCE FIGURE 11. TURN-ON TIME Z OUT (Ω) 16 14 12 1 8 6 1nF 1nF NO LOAD 1nF 2mV/DIV GAIN IS x1, NOISE IS 4.5µV P-P 4 2 1 1 1 1k 1k 1k 1M FREQUENCY (Hz) FIGURE 12. Z OUT vs FREQUENCY FIGURE 13. NOISE,.1Hz TO 1Hz 4 FN6744. December 15, 28
ISL219MEP Typical Performance Curves (ISL219-25EP) (R EXT = 1kΩ) (Continued) NO OUTPUT CAPACITANCE NO OUTPUT CAPACITANCE 7mA +5µA -5µA -7mA FIGURE 14. LOAD TRANSIENT RESPONSE FIGURE 15. LOAD TRANSIENT RESPONSE Typical Performance Curves (ISL219-41EP) (R EXT = 1kΩ) 11 1 I IN (µa) 15 1 95 9 85 UNIT 2 UNIT 3 UNIT 1 I IN (µa) 95 9 85-4 C 8 5 7 9 11 13 15 17 FIGURE 16. I IN vs, 3 UNITS 8 5 7 9 11 13 15 17 FIGURE 17. I IN vs, 3 TEMPERATURES (V) NORMALIZED TO 4.96V AT = 5.V 4.963 4.962 4.962 4.961 4.961 4.96 4.96 4.959 4.959 UNIT 3 UNIT 1 UNIT 2 4.958 4.5 6.5 8.5 1.5 12.5 14.5 16.5 FIGURE 18. LINE REGULATION, 3 UNITS Δ (mv) NORMALIZED TO = 5.5V 2 15 1 5-5 -55 C -1 4.5 6.5 8.5 1.5 12.5 14.5 16.5 FIGURE 19. LINE REGULATION OVER-TEMPERATURE 5 FN6744. December 15, 28
ISL219MEP Typical Performance Curves (ISL219-41EP) (R EXT = 1kΩ) (Continued) Δ (mv) NORMALIZED TO = 5.5V.6.5.4.3.2.1. -.1-55 C -.2-7 -6-5 -4-3 -2-1 1 2 3 4 5 6 7 SINKING OUTPUT CURRENT (ma) SOURCING FIGURE 2. LOAD REGULATION (V) NORMALIZED TO 4.96V 4.97 4.965 4.96 UNIT 2 4.955 UNIT 3 4.95 UNIT 1 4.945-4 -25-1 5 2 35 5 65 8 95 11 125 TEMPERATURE ( C) FIGURE 21. vs TEMPERATURE PSRR (db) -1 (DC) = 5V (AC) RIPPLE = 5mV P-P NO LOAD -2 1nF LOAD -3-4 1nF LOAD -5-6 -7 1nF LOAD -8 1 1 1 1k 1k 1k 1M 1M FREQUENCY (Hz) FIGURE 22. PSRR AT DIFFERENT CAPACITIVE LOADS X = 1µs/DIV Y = 2mV/DIV FIGURE 23. LINE TRANSIENT RESPONSE, NO CAPACITIVE LOAD V REF X = 1µs/DIV Y = 2mV/DIV X = 5µs/DIV Y = 2V/DIV FIGURE 24. LINE TRANSIENT RESPONSE,.1µF LOAD CAPACITANCE FIGURE 25. TURN-ON TIME 6 FN6744. December 15, 28
ISL219MEP Typical Performance Curves (ISL219-41EP) (R EXT = 1kΩ) (Continued) Z OUT ( Ω) 2 18 16 14 1nF LOAD 12 1 NO LOAD 8 6 1nF LOAD 4 2 1 1 1 1k 1k 1k 1M 1M FREQUENCY (Hz) FIGURE 26. Z OUT vs FREQUENCY 2mV/DIV GAIN IS x1, NOISE IS 4.5µV P-P 1s/DIV FIGURE 27. NOISE,.1Hz TO 1Hz +5µA 7mA -5µA NO OUTPUT CAPACITANCE X = 5µs/DIV Y = 5mV/DIV -7mA NO OUTPUT CAPACITANCE X = 5µs/DIV Y = 5mA/DIV FIGURE 28. LOAD TRANSIENT RESPONSE FIGURE 29. LOAD TRANSIENT RESPONSE 7 FN6744. December 15, 28
ISL219MEP Typical Performance Curves (ISL219-5EP) (R EXT = 1kΩ) 14 11 UNIT3 UNIT2 12 I IN (µa) 1 8 6 4 2 UNIT1 I IN (µa) 1 9-4 C 5.5 6.5 7.5 8.5 9.5 1.5 11.5 12.5 13.5 14.5 15.5 16.5 FIGURE 3. I IN vs, 3 UNITS 8 5.5 6.5 7.5 8.5 9.5 1.5 11.5 12.5 13.5 14.5 15.5 16.5 FIGURE 31. I IN vs, 3 TEMPERATURES (V) (NORMALIZED TO 5.V AT = 1V) 5.1 5. 4.9999 4.9998 4.9997 4.9996 4.9995 UNIT1 UNIT3 UNIT2 4.9994 5.5 6.5 7.5 8.5 9.5 1.5 11.5 12.5 13.5 14.5 15.5 16.5 FIGURE 32. LINE REGULATION Δ (mv) NORMALIZED TO = 5.5V 1 5-5 -1-15 -2-25 -3-35 -55 C -4 5.5 6.5 7.5 8.5 9.5 1.5 11.5 12.5 13.5 14.5 15.5 16.5 FIGURE 33. LINE REGULATION OVER-TEMPERATURE.1 Δ (mv) NORMALIZED TO = 5.5V.5 -.5 -.1 -.15-55 C -.2-7 -6-5 -4-3 -2-1 1 2 3 4 5 6 7 SINKING OUTPUT CURRENT (ma) SOURCING FIGURE 34. LOAD REGULATION 8 FN6744. December 15, 28
ISL219MEP Typical Performance Curves (ISL219-5EP) (R EXT = 1kΩ) (Continued) (V) 5.1 NORMALIZED TO 5.1 5. UNIT 2 UNIT 1 5. 4.999 4.999 UNIT 3 4.998-4 -2 2 4 6 8 1 12 14 TEMPERATURE ( C) FIGURE 35. vs TEMPERATURE PSRR (db) -1 (DC) = 1V NO LOAD -2 (AC) RIPPLE = 5mV P-P -3-4 -5-6 1nF -7-8 1nF 1nF -9-1 1 1 1 1k 1k 1k 1M 1M FREQUENCY (Hz) FIGURE 36. PSRR AT DIFFERENT CAPACITIVE LOADS = 1V D = 1V = 1V D = 1V FIGURE 37. LINE TRANSIENT RESPONSE, NO CAPACITIVE LOAD FIGURE 38. LINE TRANSIENT RESPONSE,.1µF LOAD CAPACITANCE AND (V) 12 1 8 6 4 2 27nA 34nA 45nA Z OUT (W) 12 1 8 6 4 2 1nF 1nF NO LOAD 5 1 15 2 25 3 TIME (µs) FIGURE 39. TURN-ON TIME 1 1 1 1k 1k 1k 1M FREQUENCY (Hz) FIGURE 4. Z OUT vs FREQUENCY 9 FN6744. December 15, 28
ISL219MEP Typical Performance Curves (ISL219-5EP) (R EXT = 1kΩ) (Continued) GAIN IS x1 NOISE IS 4.5µV P-P 5µA 2mV/DIV -5µA FIGURE 41. NOISE,.1Hz TO 1Hz FIGURE 42. LOAD TRANSIENT RESPONSE 7mA -7mA FIGURE 43. LOAD TRANSIENT RESPONSE Applications Information FGA Technology The ISL219MEP 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 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 ISL219MEP 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 4.5µV P-P benefitting precision, low noise portable applications such as handheld meters and instruments. Data Converters in particular can utilize the ISL219MEP as an external voltage reference. Low power DAC and ADC circuits will realize maximum resolution with lowest noise. 1 FN6744. December 15, 28
ISL219MEP 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. Noise Performance and Reduction The output noise voltage in a.1hz to 1Hz bandwidth is typically 4.5µV P-P. The noise measurement is made with a bandpass filter made of a 1-pole high-pass filter with a corner frequency at.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 1kHz to 1MHz bandwidth is approximately 4µV P-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 1/1 of the center frequency and 1-pole low-pass filter with a corner frequency at 1x the center frequency. Load capacitance up to 1pF can be added but will result in only marginal improvements in output noise and transient response. The output stage of the ISL219MEP is not designed to drive heavily capactive loads, so for load capacitances above.1µf, 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 2µV P-P from 1Hz to 1MHz using this network with a.1µf capacitor and a 2kΩ resistor in series with a 1µF capacitor. Also, transient response is improved with higher value output capacitor. The.1µF value can be increased for better load transient response with little sacrifice in output stability. Turn-On Time The ISL219MEP 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 1µs. 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, (V HIGH V LOW ), and divide by the temperature extremes of measurement (T HIGH T LOW ). The result is divided by the nominal reference voltage (at T = ) and multiplied by 1 6 to yield ppm/ C. This is the Box method for specifying temperature coefficient. Output Voltage Adjustment The output voltage can be adjusted up or down by 2.5% by placing a potentiometer from to 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 (<5ppm/ C) and the resulting voltage divider should have very low tempco <5ppm/ C. A digital potentiometer such as the ISL9581 provides a low tempco resistance and excellent resistor and tempco matching for trim applications.. = 5.V.1µF 1µF V O ISL219-25EP.1µF 2kΩ 1µF FIGURE 44. HANDLING HIGH LOAD CAPACITANCE 11 FN6744. December 15, 28
ISL219MEP Typical Application Circuits = +5.V R = 2Ω 2N295 ISL219MEP = 2.5V.1µF 2.5V/5mA FIGURE 45. PRECISION 2.5V, 5mA REFERENCE +3.5V TO 16.5V.1µF 1µF ISL219-25EP = 2.5V.1µF V CC R H X9119 (UNBUFFERED) 2-WIRE BUS SDA SCL + EL8178 (BUFFERED) V SS R L FIGURE 46. 2.5V FULL SCALE LOW-DRIFT, LOW NOISE, 1-BIT ADJUSTABLE VOLTAGE SOURCE 12 FN6744. December 15, 28
ISL219MEP Typical Application Circuits (Continued) +3.5V TO 16.5V.1µF 1µF ISL219-25EP + EL8178 SENSE LOAD FIGURE 47. KELVIN SENSED LOAD +3.5V TO 16.5V.1µF 1µF VOUT ISL219-25EP 2.5V ±2.5% TRIM I 2 C BUS V CC SDA SCL ISL9581 VSS R H R L FIGURE 48. OUTPUT ADJUSTMENT USING THE TRIM PIN 13 FN6744. December 15, 28
ISL219MEP Small Outline Plastic Packages (SOIC) N INDEX AREA 1 2 3 e D B.25(.1) M C A M E -B- -A- -C- SEATING PLANE A B S H.25(.1) M B A1 α.1(.4) L M h x 45 NOTES: 1. Symbols are defined in the MO Series Symbol List in Section 2.2 of Publication Number 95. 2. Dimensioning and tolerancing per ANSI Y14.5M-1982. 3. Dimension D does not include mold flash, protrusions or gate burrs. Mold flash, protrusion and gate burrs shall not exceed.15mm (.6 inch) per side. 4. Dimension E does not include interlead flash or protrusions. Interlead flash and protrusions shall not exceed.25mm (.1 inch) per side. 5. The chamfer on the body is optional. If it is not present, a visual index feature must be located within the crosshatched area. 6. L is the length of terminal for soldering to a substrate. 7. N is the number of terminal positions. 8. Terminal numbers are shown for reference only. 9. The lead width B, as measured.36mm (.14 inch) or greater above the seating plane, shall not exceed a maximum value of.61mm (.24 inch). 1. Controlling dimension: MILLIMETER. Converted inch dimensions are not necessarily exact. C M8.15 (JEDEC MS-12-AA ISSUE C) 8 LEAD NARROW BODY SMALL OUTLINE PLASTIC PACKAGE INCHES MILLIMETERS SYMBOL MIN MAX MIN MAX NOTES A.532.688 1.35 1.75 - A1.4.98.1.25 - B.13.2.33.51 9 C.75.98.19.25 - D.189.1968 4.8 5. 3 E.1497.1574 3.8 4. 4 e.5 BSC 1.27 BSC - H.2284.244 5.8 6.2 - h.99.196.25.5 5 L.16.5.4 1.27 6 N 8 8 7 a 8 8 - Rev. 1 6/5 All Intersil U.S. products are manufactured, assembled and tested utilizing ISO9 quality systems. Intersil Corporation s quality certifications can be viewed at www.intersil.com/design/quality Intersil products are sold by description only. Intersil Corporation reserves the right to make changes in circuit design, software and/or specifications at any time without notice. Accordingly, the reader is cautioned to verify that data sheets are current before placing orders. Information furnished by Intersil is believed to be accurate and reliable. However, no responsibility is assumed by Intersil or its subsidiaries for its use; nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Intersil or its subsidiaries. For information regarding Intersil Corporation and its products, see www.intersil.com 14 FN6744. December 15, 28