Low-Power, Low-Drift, +2.5V/+5V/+10V Precision Voltage References

Transcription

1 19-38; Rev 3; 6/7 Low-Power, Low-Drift, +2.5V/+5V/+1V General Description The precision 2.5V, 5V, and 1V references offer excellent accuracy and very low power consumption. Extremely low temperature drift combined with excellent line and load regulation permit stable operation over a wide range of electrical and environmental conditions. Operation for the MAX873 is guaranteed with a +4.5V supply, making the part ideal in systems running from a +5V ±1% supply. Low 1Hz to 1kHz noise typically 3.8µV RMS, 9µV RMS, and 18µV RMS, respectively, for the MAX873, MAX875, MAX876 make the parts suitable for 12-bit data-acquisition systems. A TRIM pin facilitates adjustment of the reference voltage over a ±6% range, using only a 1kΩ potentiometer. A voltage output proportional to temperature provides a source for temperature compensation circuits, temperature warning circuits, and other applications. 12-Bit ADCs and DACs Digital Multimeters Portable Data-Acquisition Systems Low-Power Test Equipment Applications Features +2.5V/+5V/+1V Outputs ±1.5mV/±2.mV/±3.mV (max) Initial Accuracy 7ppm/ C (max) Temperature Coefficient 45µA (max) Quiescent Current Low Noise: 3.8µV P-P (typ at 2.5V) Sources 1mA, Sinks 2mA 15ppm/mA Load Regulation (max) 4ppm/V Line Regulation (max) Wide Supply Voltage Range, +4.5V to +18V (MAX873) TEMP Output Proportional to Temperature V+.1µF* Typical Operating Circuit IN MAX873 MAX875 MAX876 OUT +2.5V (MAX873) +5.V (MAX875) +1.V (MAX876) *OPTIONAL Pin Configuration appears at end of data sheet. V PART PIN- PACKAGE OUTPUT VOLTAGE (V) Ordering Information/Selector Guide MAX TEMPCO (ppm/ C) INITIAL ACCURACY % PKG CODE MAX873AESA+ 8 SO ±.6 S8-4 MAX873BESA+ 8 SO ±.1 S8-4 MAX875AESA+ 8 SO 5. 7 ±.4 S8-4 MAX875BESA+ 8 SO 5. 2 ±.6 S8-4 MAX876AESA+ 8 SO 1. 7 ±.3 S8-4 MAX876BESA+ 8 SO 1. 2 ±.5 S8-4 +Denotes a lead-free package. Note: All devices are specified over the -4 C to +85 C operating temperature range. Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim Direct at , or visit Maxim s website at

2 Low-Power, Low-Drift, +2.5V/+5V/+1V ABSOLUTE MAXIMUM RATINGS IN to...-.3v to +2V OUT, TRIM, TEMP, TEST...-.3V to (IN +.3V) Output Short-Circuit Duration (to )...5s Continuous Power Dissipation (T A = +7 C) SO (derate 5.88mW/ C above +7 C)...471mW Operating Temperature Ranges: MAX87 E_A...-4 C to +85 C Storage Temperature Range C to +15 C Lead Temperature (soldering, 1s)...+3 C Junction Temperature (T J ) C Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. ELECTRICAL CHARACTERISTICS MAX873 (V IN = +5V, I L = ma, C LOAD < 1pF, T A = -4 C to +85 C, unless otherwise noted.) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Output Voltage Output-Voltage Drift (Note 1) Output-Noise Voltage e n Line Regulation Load Regulation MAX873A (.6%) MAX873B (.1%) MAX873A 2 7 TC MAX873B 5 2 V IN = 4.5V to 18V V ppm/ C.1Hz to 1Hz 3.8 µv P-P 1Hz to 1kHz 6.8 µv RMS 1 4. T A = -4 C to +85 C 2 6 I L = to 1mA 3 15 (source) T A = -4 C to +85 C 3 2 I L = to -1mA (sink) 1 9 T A = -4 C to +85 C Quiescent Supply Current I Q T A = -4 C to +85 C 3 6 ppm/v ppm/ma µa Short-Circuit Output Current I SC Output shorted to 6 ma Adjust Range ±1 mv Long-Term Output Drift 5 ppm/kh TEMP PIN Voltage Output V TEMP 57 mv Temperature Sensitivity TCV TEMP 1.9 mv/ C ELECTRICAL CHARACTERISTICS MAX875 (V IN = +15V, I L = ma, C LOAD < 1pF, T A = -4 C to +85 C, unless otherwise noted.) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Output Voltage Output Voltage Drift (Note 1) MAX875A (.4%) MAX875B (.6%) MAX875A 2 7 TC MAX875B 5 2 V ppm/ C Output-Noise Voltage e n Line Regulation V IN = 7V to 18V.1Hz to 1Hz 9 µv P-P 1Hz to 1kHz 14.5 µv RMS 1 4. T A = -4 C to +85 C 2 6 ppm/v 2

3 Low-Power, Low-Drift, +2.5V/+5V/+1V ELECTRICAL CHARACTERISTICS MAX875 (continued) (V IN = +15V, I L = ma, C LOAD < 1pF, T A = -4 C to +85 C, unless otherwise noted.) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Load Regulation ELECTRICAL CHARACTERISTICS MAX876 (V IN = +15V, I L = ma, C LOAD < 1pF, T A = -4 C to +85 C, unless otherwise noted.) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Output Voltage Output Voltage Drift (Note 1) I L = to 1mA 3 15 (source) T A = -4 C to +85 C 3 2 I L = to -1mA (sink) 1 9 T A = -4 C to +85 C Quiescent Supply Current I Q T A = -4 C to +85 C 32 7 Short-Circuit Output Current I SC Output shorted to 6 ma Adjust Range ±3 mv MAX876A (.3%) MAX876B (.5%) MAX876A 2 7 TC MAX876B 5 2 ppm/ma Long-Term Output Drift 5 ppm/kh TEMP PIN Voltage Output V TEMP 63 mv Temperature Sensitivity TCV TEMP 2.1 mv/ C µa V ppm/ C Output-Noise Voltage e n Line Regulation Load Regulation V IN = 12V to 18V.1Hz to 1Hz 18 µv P-P 1Hz to 1kHz 29 µv RMS 1 4. T A = -4 C to +85 C 1 6 I L = to 1mA 1 15 (source) T A = -4 C to +85 C 1 2 I L = to -1mA (sink) 1 9 T A = -4 C to +85 C Quiescent Supply Current I Q T A = -4 C to +85 C 34 7 Short-Circuit Output Current I SC Output shorted to 6 ma Adjust Range ±6 mv ppm/v ppm/ma Long-Term Output Drift 5 ppm/kh TEMP PIN Voltage Output V TEMP 63 mv Temperature Sensitivity TCV TEMP 2.1 mv/ C Note 1: Temperature coefficient is defined as maximum divided by maximum T of the temperature range. µa 3

4 Low-Power, Low-Drift, +2.5V/+5V/+1V Typical Operating Characteristics (V IN = +5V for = +2.5V, V IN = +15V for = +1V, =,, unless otherwise noted.) OUTPUT VOLTAGE (V) OUTPUT VOLTAGE CHANGE (mv) OUTPUT VOLTAGE vs. TEMPERATURE ( = 2.5V) THREE TYPICAL PARTS TEMPERATURE ( C) LOAD REGULATION vs. SOURCE CURRENT ( = 1V) T A = -4 C MAX873/75/76 toc1 MAX873/75/76 toc4 OUTPUT VOLTAGE (V) OUTPUT VOLTAGE CHANGE (mv) OUTPUT VOLTAGE vs. TEMPERATURE ( = 1V) THREE TYPICAL PARTS TEMPERATURE ( C) LOAD REGULATION vs. SINK CURRENT ( = 2.5V) T A = -4 C MAX873/75/76 toc2 MAX873/75/76 toc5 OUTPUT VOLTAGE CHANGE (mv) OUTPUT VOLTAGE CHANGE (mv) LOAD REGULATION vs. SOURCE CURRENT ( = 2.5V) T A = -4 C SOURCE CURRENT (ma) LOAD REGULATION vs. SINK CURRENT ( = 1V) T A = -4 C MAX873/75/76 toc3 MAX873/75/76 toc SOURCE CURRENT (ma) SINK CURRENT (ma) SINK CURRENT (ma) OUTPUT VOLTAGE CHANGE (µv) LINE REGULATION vs. TEMPERATURE ( = 2.5V) T A = -4 C MAX873/75/76 toc7 OUTPUT VOLTAGE CHANGE (µv) LINE REGULATION vs. TEMPERATURE ( = 1V) T A = -4 C MAX873/75/76 toc8 DROPOUT VOLTAGE (V) MINIMUM INPUT-OUTPUT DIFFERENTIAL vs. SOURCE CURRENT ( = 2.5V) T A = -4 C MAX873/75/76 toc INPUT VOLTAGE (V) INPUT VOLTAGE (V) SOURCE CURRENT (ma) 4

5 Low-Power, Low-Drift, +2.5V/+5V/+1V Typical Operating Characteristics (continued) (V IN = +5V for = +2.5V, V IN = +15V for = +1V, =,, unless otherwise noted.) DROPOUT VOLTAGE (V) OUTPUT IMPEDANCE (Ω) MINIMUM INPUT-OUTPUT DIFFERENTIAL vs. SOURCE CURRENT ( = 1V) T A = -4 C SOURCE CURRENT (ma) OUTPUT IMPEDANCE vs. FREQUENCY ( = 2.5V) MAX873/75/76 toc1 MAX873/75/76 toc13 PSRR (db) SUPPLY CURRENT (µa) POWER-SUPPLY REJECTION RATIO vs. FREQUENCY ( = 2.5V) FREQUENCY (khz) SUPPLY CURRENT vs. INPUT VOLTAGE ( = 2.5V) T A = -4 C MAX873/75/76 toc11 MAX873/75/76 toc14 PSRR (db) SUPPLY CURRENT (µa) POWER-SUPPLY REJECTION RATIO vs. FREQUENCY ( = 1V) FREQUENCY (khz) SUPPLY CURRENT vs. INPUT VOLTAGE ( = 1V) T A = -4 C MAX873/75/76 toc12 MAX873/75/76 toc FREQUENCY (khz) INPUT VOLTAGE (V) INPUT VOLTAGE (V) SUPPLY CURRENT (µa) SUPPLY CURRENT vs. TEMPERATURE ( = 2.5V) MAX873/75/76 toc16 SUPPLY CURRENT (µa) SUPPLY CURRENT vs. TEMPERATURE ( = 1V) MAX873/75/76 toc17 TEMP VOLTAGE (mv) TEMP VOLTAGE vs. TEMPERATURE ( = 2.5V) MAX873/75/76 toc TEMPERATURE ( C) TEMPERATURE ( C) TEMPERATURE ( C) 5

6 Low-Power, Low-Drift, +2.5V/+5V/+1V Typical Operating Characteristics (continued) (V IN = +5V for = +2.5V, V IN = +15V for = +1V, =,, unless otherwise noted.) TEMP VOLTAGE (mv) VOUT (V) TEMP VOLTAGE vs. TEMPERATURE ( = 1V) TEMPERATURE ( C) LONG-TERM STABILITY vs. TIME ( = 1.V) TWO TYPICAL PARTS TIME (hours) MAX873/75/76 toc19 MAX873/75/76 toc22 OUTPUT VOLTAGE (V) OUTPUT VOLTAGE-NOISE DENSITY (nv/ Hz) OUTPUT VOLTAGE vs. TRIM VOLTAGE ( = 2.5V) TRIM VOLTAGE (V) OUTPUT-VOLTAGE NOISE DENSITY vs. FREQUENCY ( = 2.5V) FREQUENCY (Hz) MAX873/75/76 toc2 MAX873/75/76 toc23 VOUT (V) OUTPUT VOLTAGE-NOISE DENSITY (nv/ Hz) LONG-TERM STABILITY vs. TIME ( = 2.5V) TWO TYPICAL PARTS TIME (hours) 1, 1 1 OUTPUT-VOLTAGE NOISE DENSITY vs. FREQUENCY ( = 1V) FREQUENCY (Hz) MAX873/75/76 toc21 MAX873/75/76 toc24.1hz TO 1Hz OUTPUT NOISE ( = 2.5V) MAX873/75/76 toc25.1hz TO 1Hz OUTPUT NOISE ( = 1V) MAX873/75/76 toc26 1µV/div 4µV/div 1s/div 1s/div 6

7 Low-Power, Low-Drift, +2.5V/+5V/+1V Typical Operating Characteristics (continued) (V IN = +5V for = +2.5V, V IN = +15V for = +1V, =,, unless otherwise noted.) ( = 2.5V, C OUT =, TO 2mA) 1µs/div MAX873/75/76 toc27 ( = 2.5V, C OUT = 1µF, TO +2mA) MAX873/75/76 toc29 2mA 1V/div 2mA ( = 1V, C OUT =, TO 2mA) 1µs/div MAX873/75/76 toc28 ( = 1V, C OUT = 1µF, TO 2mA) MAX873/75/76 toc3 2mA 1V/div 2mA 5mV/div 1mV/div 2µs/div 1µs/div ( = 2.5V, C OUT =, TO -2mA) MAX873/75/76 toc31-2ma ( = 1V, C OUT =, TO -2mA) MAX873/75/76 toc32-2ma 2mV/div 2mV/div 4µs/div 2µs/div 7

8 Low-Power, Low-Drift, +2.5V/+5V/+1V Typical Operating Characteristics (continued) (V IN = +5V for = +2.5V, V IN = +15V for = +1V, =,, unless otherwise noted.) ( = 2.5V, C OUT = 1µF, TO -2mA) 4µs/div LINE TRANSIENT ( = 2.5V) MAX873/75/76 toc33 MAX873/75/76 toc35-2ma 2mV/div 5.5V V IN 4.5V ( = 1V, C OUT = 1µF, TO -2mA) 4µs/div LINE TRANSIENT ( = 1V) MAX873/75/76 toc34 MAX873/75/76 toc36-2ma 5mV/div 15.5V V IN 1V/div 14.5V 2mV/div 2mV/div C OUT = 1µs/div 2µs/div TURN-ON TRANSIENT ( = 2.5V, C OUT = ) MAX873/75/76 toc37 TURN-ON TRANSIENT ( = 2.5V, C OUT = 1µF) MAX873/75/76 toc38 V IN 2V/div V IN 2V/div 1µs/div C OUT = 1V/div 4µs/div 1V/div 8

9 Low-Power, Low-Drift, +2.5V/+5V/+1V Typical Operating Characteristics (continued) (V IN = +5V for = +2.5V, V IN = +15V for = +1V, =,, unless otherwise noted.) TURN-ON TRANSIENT ( = 1V, C OUT = ) 1µs/div MAX873/75/76 toc39 V IN 5V/div 5V/div PIN NAME FUNCTION 1, 8 I.C. Internally Connected. Do not connect externally. 2 IN Positive Power-Supply Input 3 TEMP 4 Ground 5 TRIM 6 OUT Output Voltage TURN-ON TRANSIENT ( = 1V, C OUT = 1µF) 2µs/div MAX873/75/76 toc4 V IN 5V/div 5V/div Pin Description Temperature Proportional Output Voltage. TEMP generates an output voltage proportional to the die temperature. Output Voltage Trim. Connect TRIM to the center of a voltage-divider between OUT and for trimming. Leave unconnected to use the preset output voltage. 7 N.C. No Connection. Not internally connected. Detailed Description The precision voltage references provide accurate preset +2.5V, +5.V, and +1V reference voltages from up to +4V input voltages. These devices feature a proprietary temperature-coefficient curvature-correction circuit and laser-trimmed thin-film resistors that result in a very low 3ppm/ C temperature coefficient and excellent.5% initial accuracy. The draw 34µA of supply current and source 3mA or sink 2mA of load current. Trimming the Output Voltage Trim the factory-preset output voltage on the by placing a resistive divider network between OUT, TRIM, and. Use the following formula to calculate the change in output voltage from its preset value: = 2 x (V TRIM - V TRIM (open) ) x k where: V TRIM = V to V TRIM (open) = (nominal) / 2 (typ) k = ±6% (typ) For example, use a 5kΩ potentiometer (such as the MAX5436) between OUT, TRIM, and with the potentiometer wiper connected to TRIM (see Figure 2). As the TRIM voltage changes from to, the output voltage changes accordingly. Set R2 to 1MΩ or less. Currents through resistors R1 and R2 add to the quiescent supply current. 9

10 Low-Power, Low-Drift, +2.5V/+5V/+1V Temp Output The provide a temperature output proportional to die temperature. TEMP can be calculated from the following formula: TEMP (V) = T J ( K) x n where T J = the die temperature, n = the temperature multiplier, n = VTEMP( at TJ = T ) T 19. mv / K T A = the ambient temperature. Self-heating affects the die temperature and conversely, the TEMP output. The TEMP equation assumes the output is not loaded. If device power dissipation is negligible, then T J T A. Applications Information Bypassing/Output Capacitance For the best line-transient performance, decouple the input with a.1µf ceramic capacitor as shown in the Typical Operating Circuit. Place the capacitor as close to IN as possible. When transient performance is less important, no capacitor is necessary. The do not require an output capacitor for stability and are stable with capacitive loads up to 1µF. In applications where the load or the supply can experience step changes, a larger output capacitor reduces the amount of overshoot (undershoot) and improves the circuit s transient response. Place output capacitors as close to the devices as possible for best performance. Supply Current The consume 32µA (typ) of quiescent supply current. This improved efficiency reduces power dissipation and extends battery life. Thermal Hysteresis Thermal hysteresis is the change in the output voltage at before and after the device is cycled over its entire operating temperature range. Hysteresis is caused by differential package stress appearing across the bandgap core transistors. The typical thermal hysteresis value is 12ppm. Turn-On Time The typically turn on and settle to within.1% of the preset output voltage in 15µs (2.5V output). The turn-on time can increase up to 15µs with the device operating with a 1µF load. Short-Circuited Outputs The feature a short-circuit-protected output. Internal circuitry limits the output current to 6mA when short circuiting the output to ground. The output current is limited to 3mA when short circuiting the output to the input. 1, 1 TEMPERATURE COEFFICIENT (ppm/ C) 1 8-BIT 1 1-BIT 12-BIT 1 14-BIT.1 16-BIT 18-BIT.1 2-BIT OPERATING TEMPERATURE RANGE (T MAX - T MIN ) ( C) Figure 1. Temperature Coefficient vs. Operating Temperature Range for a 1 LSB Maximum Error 1

11 Low-Power, Low-Drift, +2.5V/+5V/+1V Temperature Coefficient vs. Operating Temperature Range for a 1 LSB Maximum Error In a data converter application, the reference voltage of the converter must stay within a certain limit to keep the error in the data converter smaller than the resolution limit through the operating temperature range. Figure 1 shows the maximum allowable reference-voltage temperature coefficient to keep the conversion error to less than 1 LSB, as a function of the operating temperature range (T MAX - T MIN ) with the converter resolution as a parameter. The graph assumes the reference-voltage temperature coefficient as the only parameter affecting accuracy. In reality, the absolute static accuracy of a data converter is dependent on the combination of many parameters such as integral nonlinearity, differential nonlinearity, offset error, gain error, as well as voltagereference changes. TOP VIEW Pin Configuration * *OPTIONAL. ( + 2V) TO 4V INPUT TEMP IN MAX873 MAX875 MAX876 OUT TRIM REFERENCE OUTPUT MAX5436 5kΩ POTENTIOMETER Figure 2. Applications Circuit Using the MAX5436 Potentiometer TRANSISTOR COUNT: 429 PROCESS: BiCMOS Chip Information I.C.* 1 8 I.C.* IN TEMP MAX873 MAX875 MAX N.C. OUT TRIM SO *INTERNALLY CONNECTED. DO NOT CONNECT. 11

12 Low-Power, Low-Drift, +2.5V/+5V/+1V Package Information (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information go to N 1 TOP VIEW D E A H C INCHES MILLIMETERS DIM MIN MAX MIN MAX A A B C e.5 BSC 1.27 BSC E H L VARIATIONS: DIM D D D INCHES MILLIMETERS MIN MAX MIN MAX N MS AA AB AC SOICN.EPS e B A1 FRONT VIEW L SIDE VIEW -8 PROPRIETARY INFORMATION TITLE: PACKAGE OUTLINE,.15" SOIC APPROVAL DOCUMENT CONTROL NO. REV B 1 1 Revision History Pages changed at Rev 3: 1 12 Maxim cannot assume responsibility for use of any circuitry other 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. 12 Maxim Integrated Products, 12 San Gabriel Drive, Sunnyvale, CA Maxim Integrated Products is a registered trademark of Maxim Integrated Products, Inc.