13E. D Ml 5676651 0002335 9 MAAAL/VI MAXIM INTEGRATED PRODUCTS Pin Programmable Precision Voltage Reference ______ sd General Description Features Maxim's AD584 Is a temperature compensated, band- @ Programmable Outputs of: T-5-OT7 gap voltage reference which provides pin-programm- +10.0V, +7.5V, +5.0V, +2.5V able output voltages of +10.00V, +7.50V. +5.00V, and +2.50V. External components are not required for these outputs, but if other voltages are desired, they can be programmed with external resistors. Laser trimming minimizes output error as well as temperature drift, to +5mV Tolerance at +10V (AD584L) Low Tempco: Sppm/C Max. (ADS584L) No External Components or Trims 5 o 3 Se a i in as low as 5mV and 5ppm/C with the AD584L. Short Circult Proof The input voltage range of the AD584 is 4.5V to gov. The Output Sources and Sinks Current down the reference output, Typical current drainwhen TOMA Output Current ON Is 750,A. This drops to about 100A whentherefer- 4 ._______ Ordering Information ence is strobed OFF. The AD584 is designed for use with 8 to 14 bit A/D and PART TEMP.RANGE PACKAGE ERROR D/A converters as well as data acquisition systems. Itis AD584JH OCto+70G = TO-99 Can +30mV available in 8-iead TO-89 metal cans, plastic DIPs, ADS84KH OCte+70C TO-99 Can +10mV CERDIPs, and smail outline packages. ADS84LH Powe T0289 Can mv ADS84JN 06C to +70C Plastic DIP +30mV ADS584KN O'Cto+70C _~Plastic DIP +10mV Applications [ aosean OCto+70C Plastic DIP +5mV CMOS DAC Reference ADS584UCSA O@Cto+70C Small Outline +30mV A/D Converter Reference AD584KCSA OCto+70C =SmallOutline = 10mV Measurement Instrumentation ADS84LCSA OCto+70C Smal Outline t5mV Data Loggers AD584JC/D 0C to +70C Dice +30mV Precision Analog Systems ADS84SH SEEC to #126C __TO-99 0mv Programmable Offset for PGAs ADSSsTH SEC to M256 10-88 =10mV . ADS84SQ -55C to+125C += CERDIP 430mV ADS584TQ -55C to 125C = CERDIP +10mV * All devices 8 Lead Packages Pin Configuration _________ Typical Operating Circuit Top View VV toov C1 re] +Vg SOV2Z) waar [CAP asvie] 42% Lava COMMON [7 rs] STROBE 8-Lead DIP . TAB MAXIM 50V.@) ADS5a4 mn 26l Oe STROBE -5V Reference for CMOS DAC TO-99 MIA Als vi Maxim Integrated Products 3-19 MAXIM |s a registered trademark of Maxim integrated ProductsMAXIM INTEGRATED PRODUCTS AD584 = wets ee te Pin Programmable T- 58-07 136 > mm 5876651 cOO2340 Precision Voltage Reference ABSOLUTE MAXIMUM RATINGS Input Voltage Vin to COMMON ... 0. eee eserreeee reese OSV, F40V Power Dissipation - - Metal Can (Derate 6.7mW/ above +60C) .. oe. 600mMW CERDIP (Derate 8mW/ above +76C) ... . 600mW Plastic DIP (Derate 6mW/ above +75C) ...... eo. 450mW Small Outline (Derate 5.3mW/ above +75C) . eee 400mW Output Short-Circuit Duration (Note 1) .....6+ tances indefinite Operating Temperature Range - Commercial (J, K,L) ....ceececaceee peeeeeeaes 0C to +70C Military (S, T, Uj ..sceceenceeeres peveeee vey 55C to +125C Storage Temperature Range ......+.+ seeneeee -65C to +160C Lead Temperature (Soldering 10sec). ...5..0.seeeeee ae. 300C Dice Junction Temporature (Tj) ...--ecerenees -55C to +150C Thermal Resistance, Junction to Ambient Metal Can CERDIP ..... 0006 obese sete ccdscneererserses see Plastic DIP .....ceccccerscecceeres dente ceeenenaee 160C/W Small Outline .......--056 Ab eeeervccercenenenes vee 170C/W Stresses above those listed under Absolute Maximum Ratings" may causa permanent damage to the device. These are stress ratings only and functional operation of the davice at these or any other conditions above those Indicated in the operational sections of the specifications ts not implied. Exposure to absolute maximum rating conditions for extended periods may affact device raliability. ELECTRICAL CHARACTERISTICS (Vin = t15V, Ta = +25C, unless otherwise noted) PARAMETER SYMBOL CONDITIONS MIN. TYP. MAX. | UNITS Vour = +10V, AD584J/S +30 ADS84K/T +10 ADS84L 6 Vout = +7.5V, ADS84J0/S +22 AD584K/T +8 + Output Voltage Tolerance i, = OmA, At Pin 1 ADEB4L #4 mV Vour = +5.0V, AD584U/S 415 ADS84K/T +6 ADS84L +3 Vout = #2.5V, AD584u/S 475 AD5S84K/T $3.5 AD584L 42.5 ADS84L, +10V, +7.5V, #5V Out 5 +2,5V Out 10 Output Voltage AD584J/S, All Outputs : 30 mC Temperature Coefficient ADS84K, All Outputs 16 Pp ADS584T, +10V, +7.5V, +5V Out 15 +2.5V Out 20 Differential Tempco ADS84K/L/T 3 mec Between Outputs AD584J/S 5 PPI Quiescent Supply Current la !L=OmA 750 1000 BA Quiescent Current Tempco 16 BpAPC Turn-on Settling Time ton To +1% 200. us Noise @np-p 0.1Hz to 10Hz 50 uVp_p Long-Term Stability ({Non-Cumulative) 25 ppm/ Short Circuit Current Iso 30 mA No Load, (Vour + 2.5V) < Viy <#15V 0.005 Line Regulation HBV < Vy < +30V 0.002 %IN Load Regulation IL=OmA to 5mA . 20 50 = |ppm/mA Ta = +25C 10 Source Tranny tO Tax 5 Output Current I Vin > Vour +2.5V Twin to Tax, ADS84J/K/L 5 mA Sink AD584S/T 0.2 -55C to+85C, ADS848/T 5 Note 1: Absolute Maximum power dissipation must not be exceeded. 3-20 JAAAL/VI 5 ayeMAXIM INTEGRATED PRODUCTS O-O) 13E D Pin Programmable Precision Voltage Reference Typical Operating Characteristics TYPICAL TEMPERATURE CHARACTERISTICS 10.006 SPECTRAL NOISE DENSITY AND RMS NOISE vs. FREQUENCY OUTPUT VOLTAGE va. SINK AND SOURCE CURRENT g z 10.000 a 9.906 = 4 55 a Fs) 70 1a ~M-15-10 -5 O09 5 10 16 4 TEMPERATURE (C} FREQUENCY {Hz} SOURCE SINK - QUTPUT CURRENT (mA) POWER-ON SETTLING CHARACTERISTICS 2 = 10.030 - : Bia worn | 2 Table 1. Programming Pin Connections 3 10.010 OUTPUT VOLTAGE | PROGRAMMING (OUTPUT ON PIN 1) = lw f to000 ~ tov Pins 2 and 3 are unconnected. 5 7.5V Connect pins 2 and 3 together. = a 5.0V Connect pins 2 and 1 together. z 10 2.5V Connect pins 3 and 1 together. sho s 3 QO 6&0 100 150 200 250 SEFTLING TIME (j23) Detailed Description As shown in Figure 1, most applications of the AD584 require no external components. Connections to +Vs, aur + BT +a and COMMON (COMMON is also tied to the case in the 8 TO-99 metal package) with all other pins unconnected 7 result in a buffered +10,00V output at pin 1. The other 1 / pretrimmed voltages are obtained by strapping pins as 10.0~pa> Your. shown in Table 1. If one or more external buffer maxim F FERN, 60%, 47.5, +10V amplifiers are connected to the programming pins (pin AD584 sy ed 2,3), multiple outputs can be obtained from one reference. . asvi2 ] Other Output Voltages The ADS584 can be adjusted to a different output voltage by adding one or more resistors as in Figure 2. As the diagram shows, the reference can be thought of as a 1.215V band-gap followed by a noninverting amplifier. If R1 and R2 are used alone, the adjustment range is widest but the resolution of the trim may be too coarse, even when a muti-turn trim pot is used. MAXL/VI L Figure 1. Basic Connection for Positive Outputs 3-21 MH 5476651 0002341 7 my resav cs.AD584 Pin Programmable MAXIM INTEGRATED pRODUCTSI-SOY :136 D MM 5876451 0002342 9 me Precision Voltage Reference When adding external resistors, output voltages well above 10V can be obtained. R2 should therefore be chosen carefully since it sets the maximum output voltage. R2's resistance should not be so low as.to jeopardized other circuits if R1 is misadjusted. The fixed output voltages can also be varied by connecting only one resistor, as in the dashed lines in Figure 2. Connecting R3 alone raises Vout while R4 alone lowers it. These resistors (or potentiometers) _must have very low temperature coefficients if accuracy over temperature is to be unaffected by the adjustment. If fine adjustment of the output is all that is required, the circuit of Figure 3 is recommended. It provides good stability and resolution for a trim range of +200mV. If the 2.5V output is adjusted, R2 should be connected to Vga, pin 6, and the trim range should be limited to 100mvV. Vout no Wr F121 ana VV VA AA WW 3 ANA comi4 * The 2.5V tap (Pin 3) is used internally as a bias point and should not be changed by more than 100mV in any trim configuration. Figure 2. Variable Output Options Vaurety 8 +Vg 100 Your 2 maxim IW? ae AD584 300K 26d as 7 6 Vea com Voltage Temperature Coefficient The temperature characteristic of the AD584 con- sistently follows an S-curve as shown in the Typical *Charcteristics. A five-point 100% test guarantees com- pliance with -55C to +125C specifications and a three-point 100% test guarantees the 0C to +70C specifications. The tolerance specificationsin the Electrical Character- istics table state the maximum deviation from the references initial value at 25C. By adding the maxi- mum deviation for a.given device to its initial tolerance, the total possible error is determined. Output Current The AD584 is capable of sinking as well as sourcing . current. The circuit is also protected for output shorts to either +Vs or ground (COMMON). The output's voltage- versus-current characteristic is shown in the Typical Characteristics section. _Dynamic Performance The turn-on settling performance of the AD584 is shown in the Typical Characteristics. Both coarse and fine transient response is. shown. The reference typically settles to imV (10V output) within 180us after power is applied. Noise Filtering The bandwidth of the AD584's output amplifier can be limited by connecting a capacitor between the CAP and Vag pins (see Figure 4). Typical values range from 0.01nF to 0.1uF. The reduction of wideband and feedthrough noise is plotted in a graph in the Typical Characteristics section. Strobe Input The STROBE input, pin 5, zeroes the reference output when it is pulled LOW. If no current is pulled from STROBE, operation is normal, The threshold of the in- put is 200mV, so an open-drain N-channel FET or open-collector transistor driven from logic is re- +V3 1 10.04 f-p> Vout CAP 01 To L MAXIM 2 Qik * Sov | 8 - AD584 Ct 26v COM t * Increases cold start turn on time. Figure 3. Fine Adjustment of Output Voltage (t200mV) 3-22 Figure 4, Additional Noise Filtering with an External Capacitor MMAXLWVIMAXIM INTEGRATED PRODUCTS 7 58-O7 136 D mm S87bb51 O002343 0 Pin Programmable Precision Voltage Reference commended (see Figure 5). The current sinking ability should be at least 500uA and the leakage current should be 5A or less. While shut down, the AD584 should not be required to source or sink current unless a 0.7V residual output is acceptable. If the reference is required to sink transient current while shut down, the current flowing out of STROBE should be limited with 1000 as shown in the dashed connection in Figure 5. . Vaurety L +g tov pam Your | ! MAXIM 2 apseq = rt = STRB 3 gag 25v LOW = On) tmng * See text. Figure 5. Use of Strobe Terminal Va 2 159 > 4700 A coM +V3 Wy | MAXIM = ADse4 ct A Oh Vv eT ER | $ . 2n649 Vour +10 @ 4A Figure 6. High Current Precision Supply Vauprty : +V3 1 we ney bARLMaTOR MAXIM 2 2N6057 ADse4 BV 2ey tS CoM L Your a sun 7 7tN L Figure 7, NPN Output Current Booster MAAXAI/VI Applications Precision High Current Reference A PNP power transistor, or Darlington, is. easily con- nected to the AD584 to greatly increase its output current. The circuit in Figure 6 provides a +10V output at up to 4 Amps. If the load has a significant capacitive component, C1 should be added. If the load is purely resistive, high frequency supply rejection is improved without C1. An NPN output transistor or Darlinton can also be used to boost output current as shown In Figure 7. . Current Limiter By adding a single resistor as shown in Figure 8, the AD584 is turned into a precision current limiter for appli- cations where the driving voltage is 5V to 40V. The programmed current ranges from 0.75mA to 5mA. i Vg Ov MAXIMA | 25 AD584 lax ot OTomA 25y cam 3 A WW Ft Figure 8. Precision Current Limiter Negative 10V Reference In applications which require a -10V, ~7.5V, -5.0V, or -2.5V reference, the AD584 can be connected as atwo- . terminal device and biased like a zener diode. The circuit is shown in. Figure 9. +Vs and Vout are connected to the analog ground bus, and the AD584s COMMON pin is connected, through a resistor, to the negative supply. With 1mA flowing in the reference, the output is typically 2mV greater than what is obtained with a conventional, positive, hook-up. When using the 2-terminal connection, the foad and the bias resistor must be selected so that the current flowing in the reference is maintained between 1mA and 5mA. The operating temperature range for this connection is limited to -55 to +85C. 3-23 > a 5MAXIM INTEGRATED PRODUCTS T-5%- OY 43E D MM S&?6651 0002344 2 Pin Programmable Precision Voltage Reference annua Reference for DACs and ADCs SROUNO The AD584 is well suited for use with a wide variety of D-to-A converters, especially CMOS DACs. Figure 10 shows a circuit in which an AD7533 10 bit DAC outputs 0 to -5V when using a +5V reference. For a positive DAC output, the AD584 can be configured as a 2-terminal negative reference as well by using the connection of Figure 9. . sv oO in Figure 11, an AD7874 CMOS A/D converter uses an AD584 O01yF] 1 com ; . AD584, connected for -2.5V, as its reference input so that the system can operate from +5V power. The 4 o> Veep = BV analog input range for the circuit is OV to +2.5V. re 3 2M ss ~l6V -5Y +hV Figure 9. Two-Terminal -5 Volt Reference MAXIM ka . a AD5e4 |, # 5% Vier ho +15V TO +18 COM a 28var 8 Le oBe- DIGITAL s 087 Sa z 3 Bors ioytlp 2 OolaF MAXIM tov 26y 4| 407574 MAXIM An 5 ~ 3 AD584 INPUT 5v MAXIM Your AD7633 . > be 1g 8 O70 +26 hex Deva fl com xa "1 MaAx400 ] TV = = TO-18v OIGITAL INPUT Figure 10. Low Power 10 Bit CMOS DAC Connection Figure 11. AD584 as Negative 2.5 Volt Reference fora CMOS ADC Chip Topography os" a {2.206nK) GAP | | a : a 3 i STROBE hk i : oo7i" hand (Leta) 1o9 COMMON Maxim cannot assume responsibility for use of any circuitry othar than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. 3-24 MAMAIL/SVI