Datasheet

ManualsBrandsANALOG DEVICES ManualsPMICsPMIC - voltage reference Series Adjustable MSOP 8

Ultralow Noise XFET Voltage References

with Current Sink and Source Capability

Data Sheet

ADR430/ADR431/ADR433/ADR434/ADR435

Rev. N Document Feedback

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FEATURES

Low noise (0.1 Hz to 10.0 Hz): 3.5 µV p-p at 2.500 V output

No external capacitor required

Low temperature coefficient

A grade: 10 ppm/°C maximum

B grade: 3 ppm/°C maximum

Load regulation: 15 ppm/mA

Line regulation: 20 ppm/V

Wide operating range

ADR430: 4.1 V to 18 V

ADR431: 4.5 V to 18 V

ADR433: 5.0 V to 18 V

ADR434: 6.1 V to 18 V

ADR435: 7.0 V to 18 V

High output source and sink current: 30 mA and −20 mA

Wide temperature range: −40°C to +125°C

APPLICATIONS

Precision data acquisition systems

High resolution data converters

Medical instruments

Industrial process control systems

Optical control circuits

Precision instruments

PIN CONFIGURATIONS

NOTES

1. NIC = NOT INTERNALLY CONNECTED.

THIS PIN IS NOT CONNECTED INTERNALLY.

2. DNC = DO NOT CONNECT. DO NOT CONNECT TO THIS PIN.

ADR430/ADR431

ADR433/ADR434

ADR435

04500-001

NIC

GND

DNC

COMP

OUT

TRIM

DNC

(Not to Scale)

TOP VIEW

Figure 1. 8-Lead MSOP (RM-8)

ADR430/ADR431

ADR433/ADR434

ADR435

TOP VIEW

(Not to Scale)

DNC

OUT

NIC

GND

DNC

COMP

TRIM

04500-041

NOTES

1. NIC = NOT INTERNALLY CONNECTED.

THIS PIN IS NOT CONNECTED INTERNALLY.

2. DNC = DO NOT CONNECT. DO NOT CONNECT TO THIS PIN.

Figure 2. 8-Lead SOIC_N (R-8)

GENERAL DESCRIPTION

The ADR430/ADR431/ADR433/ADR434/ADR435

series is a

family of XFET® voltage references featuring low noise, high

accuracy, and low temperature drift performance. Using Analog

Devices, Inc., temperature drift curvature correction and extra

implanted junction FET (XFET) technology, voltage change vs.

temperature nonlinearity in the ADR430/ADR431/ADR433/

ADR434/ADR435 is minimized.

The XFET references operate at lower current (800 µA) and

lower supply voltage headroom (2 V) than buried Zener

references. Buried Zener references require more than 5 V of

headroom for operation. The ADR430/ADR431/ADR433/

ADR434/ADR435 XFET references are low noise solutions for

5 V systems.

The ADR430/ADR431/ADR433/ADR434/ADR435 family has

the capability to source up to 30 mA of output current and sink

up to −20 mA. It also comes with a trim terminal to adjust the

output voltage over a ±0.5% range without compromising

performance.

Protected by U.S. Patent Number 5,838,192.

The ADR430/ADR431/ADR433/ADR434/ADR435 are

available in 8-lead MSOP and 8-lead narrow SOIC packages. All

versions are specified over the extended industrial temperature

range of −40°C to +125°C.

Table 1. Selection Guide

Model

Output

Voltage (V)

Initial Accuracy

(mV)

Temperature

Coefficient

(ppm/°C)

ADR430A 2.048 ±3 10

ADR430B 2.048 ±1 3

ADR431A 2.500 ±3 10

ADR431B 2.500 ±1 3

ADR433A

3.000

±4

ADR433B 3.000 ±1.5 3

ADR434A 4.096 ±5 10

ADR434B 4.096 ±1.5 3

ADR435A 5.000 ±6 10

ADR435B 5.000 ±2 3

Downloaded from Arrow.com.

Summary of content (23 pages)

PAGE 1
FEATURES PIN CONFIGURATIONS ADR430/ADR431 ADR433/ADR434 ADR435 DNC 1 8 DNC VIN 2 7 COMP TOP VIEW (Not to Scale) NIC 3 GND 4 6 VOUT 5 TRIM NOTES 1. NIC = NOT INTERNALLY CONNECTED. THIS PIN IS NOT CONNECTED INTERNALLY. 2. DNC = DO NOT CONNECT. DO NOT CONNECT TO THIS PIN. 04500-001 Low noise (0.1 Hz to 10.0 Hz): 3.5 µV p-p at 2.
PAGE 2
ADR430/ADR431/ADR433/ADR434/ADR435 Data Sheet TABLE OF CONTENTS Features .............................................................................................. 1 Noise Performance ..................................................................... 16 Applications ....................................................................................... 1 High Frequency Noise ............................................................... 16 Pin Configurations ...................................
PAGE 3
Data Sheet ADR430/ADR431/ADR433/ADR434/ADR435 Added Endnote 1 in Table 5............................................................. 7 Added Endnote 1 in Table 6............................................................. 8 Added Endnote 1 in Table 7............................................................. 9 Deleted Negative Precision Reference Without Precision Resistors Section ..............................................................................
PAGE 4
ADR430/ADR431/ADR433/ADR434/ADR435 Data Sheet SPECIFICATIONS ADR430 ELECTRICAL CHARACTERISTICS VIN = 4.1 V to 18 V, IL = 0 mA, TA = 25°C, unless otherwise noted. Table 2. Parameter OUTPUT VOLTAGE A Grade B Grade INITIAL ACCURACY1 A Grade Symbol VOUT Test Conditions/Comments Min Typ Max Unit 2.045 2.047 2.048 2.048 2.051 2.049 V V ±3 ±0.15 ±1 ±0.
PAGE 5
Data Sheet ADR430/ADR431/ADR433/ADR434/ADR435 ADR431 ELECTRICAL CHARACTERISTICS VIN = 4.5 V to 18 V, IL = 0 mA, TA = 25°C, unless otherwise noted. Table 3. Parameter OUTPUT VOLTAGE A Grade B Grade INITIAL ACCURACY1 A Grade Symbol VOUT Test Conditions/Comments Min Typ Max Unit 2.497 2.499 2.500 2.500 2.503 2.501 V V ±3 ±0.12 ±1 ±0.
PAGE 6
ADR430/ADR431/ADR433/ADR434/ADR435 Data Sheet ADR433 ELECTRICAL CHARACTERISTICS VIN = 5.0 V to 18 V, IL = 0 mA, TA = 25°C, unless otherwise noted. Table 4. Parameter OUTPUT VOLTAGE A Grade B Grade INITIAL ACCURACY1 A Grade Symbol VOUT Test Conditions/Comments Min Typ Max Unit 2.996 2.9985 3.000 3.000 3.004 3.0015 V V ±4 ±0.13 ±1.5 ±0.
PAGE 7
Data Sheet ADR430/ADR431/ADR433/ADR434/ADR435 ADR434 ELECTRICAL CHARACTERISTICS VIN = 6.1 V to 18 V, IL = 0 mA, TA = 25°C, unless otherwise noted. Table 5. Parameter OUTPUT VOLTAGE A Grade B Grade INITIAL ACCURACY1 A Grade Symbol VOUT Test Conditions/Comments Min Typ Max Unit 4.091 4.0945 4.096 4.096 4.101 4.0975 V V ±5 ±0.12 ±1.5 ±0.
PAGE 8
ADR430/ADR431/ADR433/ADR434/ADR435 Data Sheet ADR435 ELECTRICAL CHARACTERISTICS VIN = 7.0 V to 18 V, IL = 0 mA, TA = 25°C, unless otherwise noted. Table 6. Parameter OUTPUT VOLTAGE A Grade B Grade INITIAL ACCURACY1 A Grade Symbol VOUT Test Conditions/Comments Min Typ Max Unit 4.994 4.998 5.000 5.000 5.006 5.002 V V ±6 ±0.12 ±2 ±0.
PAGE 9
Data Sheet ADR430/ADR431/ADR433/ADR434/ADR435 ABSOLUTE MAXIMUM RATINGS TA = 25°C, unless otherwise noted. THERMAL RESISTANCE Table 7. θJA is specified for the worst case conditions, that is, a device soldered in a circuit board for surface-mount packages.
PAGE 10
ADR430/ADR431/ADR433/ADR434/ADR435 Data Sheet PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS ADR430/ADR431 ADR433/ADR434 ADR435 ADR430/ADR431 ADR433/ADR434 ADR435 DNC 7 COMP NIC 3 TOP VIEW (Not to Scale) GND 4 6 VOUT 5 TRIM NOTES 1. NIC = NOT INTERNALLY CONNECTED. THIS PIN IS NOT CONNECTED INTERNALLY. 2. DNC = DO NOT CONNECT. DO NOT CONNECT TO THIS PIN. DNC 1 8 DNC COMP TOP VIEW 6 VOUT (Not to Scale) 5 TRIM GND 4 VIN 2 7 NIC 3 NOTES 1. NIC = NOT INTERNALLY CONNECTED.
PAGE 11
Data Sheet ADR430/ADR431/ADR433/ADR434/ADR435 TYPICAL PERFORMANCE CHARACTERISTICS Default conditions: VIN = 7 V, TA = 25°C, CIN = COUT = 0.1 μF, unless otherwise noted. 0.8 2.5009 SUPPLY CURRENT (mA) OUTPUT VOLTAGE (V) 2.5007 2.5005 2.5003 2.5001 2.4999 0.7 +125°C 0.6 +25°C –40°C 0.5 0.4 2.4997 20 35 50 65 80 95 110 125 TEMPERATURE (°C) 4 8 10 12 14 16 125 18 INPUT VOLTAGE (V) Figure 5. ADR431 Output Voltage vs. Temperature Figure 8. ADR435 Supply Current vs. Input Voltage 4.
PAGE 12
ADR430/ADR431/ADR433/ADR434/ADR435 Data Sheet 2.5 SUPPLY VOLTAGE HEADROOM (V) SUPPLY CURRENT (µA) 580 550 520 490 460 400 –40 –25 –10 5 20 35 50 65 80 95 110 125 TEMPERATURE (°C) –40°C 1.5 +25°C 1.0 +125°C 0.5 0 –10 04500-021 430 2.0 –5 0 5 10 LOAD CURRENT (mA) Figure 11. ADR431 Supply Current vs. Temperature 04500-024 610 Figure 14. ADR431 Supply Voltage Headroom vs. Load Current over Temperature 15 1.
PAGE 13
Data Sheet ADR430/ADR431/ADR433/ADR434/ADR435 1.9 NO LOAD MINIMUM HEADROOM (V) 1.7 CL = 0.01µF NO INPUT CAPACITOR VOUT = 1V/DIV 1.5 1.3 1.1 –25 –10 5 20 35 50 65 80 95 110 125 TEMPERATURE (°C) TIME = 4µs/DIV 04500-027 0.9 –40 Figure 17. ADR435 Minimum Headroom vs. Temperature 04500-031 VIN = 2V/DIV Figure 20. ADR431 Turn-On Response Settling Time, 0.01 µF Load Capacitor 20 VIN = 7V TO 18V LINE REGULATION (ppm/V) 16 VOUT = 1V/DIV 12 CIN = 0.
PAGE 14
ADR430/ADR431/ADR433/ADR434/ADR435 BYPASS CAPACITOR = 0.1µF Data Sheet LINE INTERRUPTION VIN = 500mV/DIV VOUT = 50mV/DIV TIME = 1s/DIV Figure 23. ADR431 Line Transient Response, 0.1 µF Bypass Capacitor 04500-037 TIME = 100µs/DIV 04500-034 2µV/DIV Figure 26. ADR435 0.1 Hz to 10.0 Hz Voltage Noise 1µV/DIV TIME = 1s/DIV Figure 24. ADR431 0.1 Hz to 10.0 Hz Voltage Noise 04500-038 TIME = 1s/DIV 04500-035 50µV/DIV Figure 27.
PAGE 15
Data Sheet ADR430/ADR431/ADR433/ADR434/ADR435 10 50 45 –10 RIPPLE REJECTION (dB) OUTPUT IMPEDANCE (Ω) 40 35 30 25 ADR435 20 15 ADR433 –30 –50 –70 –90 –110 10 ADR430 5 10k FREQUENCY (Hz) 100k 10 1k 10k 100k FREQUENCY (Hz) Figure 29. Output Impedance vs. Frequency Figure 30. Ripple Rejection vs. Frequency Rev. N | Page 15 of 23 Downloaded from Arrow.com.
PAGE 16
ADR430/ADR431/ADR433/ADR434/ADR435 Data Sheet THEORY OF OPERATION The ADR430/ADR431/ADR433/ADR434/ADR435 series of references uses a reference generation technique known as XFET. This technique yields a reference with low supply current, optimal thermal hysteresis, and exceptionally low noise. The core of the XFET reference consists of two junction field effect transistors (JFETs), one of which has an extra channel implant to raise its pinch off voltage.
PAGE 17
ADR430/ADR431/ADR433/ADR434/ADR435 However, references are used increasingly to drive the reference input of an analog-to-digital (ADC) that may present a dynamic, switching capacitive load. Large capacitors, in the microfarad range, reduce the change in reference voltage to less than one-half LSB. Figure 33 shows the ADR431 noise spectrum with various capacitive values to 50 µF. With no capacitive load, the noise spectrum is relatively flat at approximately 60 nV/√Hz to 70 nV/√Hz.
PAGE 18
ADR430/ADR431/ADR433/ADR434/ADR435 Data Sheet APPLICATIONS INFORMATION OUTPUT ADJUSTMENT SOURCE FIBER The ADR430/ADR431/ADR433/ADR434/ADR435 trim terminal adjusts the output voltage over a ±0.5% range. This feature allows the system designer to trim system errors out by setting the reference to a voltage other than the nominal. This feature is also helpful if the device is used in a system at temperature to trim out any error.
PAGE 19
Data Sheet ADR430/ADR431/ADR433/ADR434/ADR435 Because the amplifier senses the load voltage, the operational amplifier loop control forces the output to compensate for the wiring error and to produce the correct voltage at the load. RLW 2 VOUT SENSE VIN ADR43x  R2 A + R2 B  R1 IL =   R2 B   RLW A1 OP191 + VOUT 6 Together with a digital potentiometer and a Howland current pump, the ADR435 forms the reference source for a programmable current as VOUT FORCE RL VW = Figure 39.
PAGE 20
ADR430/ADR431/ADR433/ADR434/ADR435 PROGRAMMABLE DAC REFERENCE VOLTAGE By employing a multichannel DAC, such as the AD7398, quad, 12-bit voltage output DAC, one of its internal DACs and an ADR430/ADR431/ADR433/ADR434/ADR435 voltage reference can be used as a common programmable VREFx for the rest of the DACs. The circuit configuration is shown in Figure 43. R2 ± 0.1% VOUTA R1 ± 0.
PAGE 21
Data Sheet ADR430/ADR431/ADR433/ADR434/ADR435 N1 A precision voltage output with boosted current capability can be achieved with the circuit shown in Figure 45. In this circuit, U2 forces VO to be equal to VREF by regulating gate voltage of N1. Therefore, the load current is supplied by VIN. In this configuration, a 50 mA load is achievable at a VIN of 5 V. Moderate heat is generated on the MOSFET, and higher current is achieved with a replacement of the larger device.
PAGE 22
ADR430/ADR431/ADR433/ADR434/ADR435 Data Sheet OUTLINE DIMENSIONS 3.20 3.00 2.80 8 3.20 3.00 2.80 5.15 4.90 4.65 5 1 4 PIN 1 IDENTIFIER 0.65 BSC 0.95 0.85 0.75 15° MAX 1.10 MAX 6° 0° 0.40 0.25 0.80 0.55 0.40 0.23 0.09 10-07-2009-B 0.15 0.05 COPLANARITY 0.10 COMPLIANT TO JEDEC STANDARDS MO-187-AA Figure 46. 8-Lead Mini Small Outline Package [MSOP] (RM-8) Dimensions shown in millimeters 5.00 (0.1968) 4.80 (0.1890) 1 5 4 1.27 (0.0500) BSC 0.25 (0.0098) 0.10 (0.0040) COPLANARITY 0.
PAGE 23
Data Sheet ADR430/ADR431/ADR433/ADR434/ADR435 ORDERING GUIDE Model1 ADR430ARZ ADR430ARZ-REEL7 ADR430ARMZ ADR430ARMZ-REEL7 ADR430BRZ ADR430BRZ-REEL7 ADR431ARZ ADR431ARZ-REEL7 ADR431ARMZ ADR431ARMZ-REEL7 ADR431BRMZ ADR431BRMZ-R7 ADR431BRZ ADR431BRZ-REEL7 ADR433ARZ ADR433ARZ-REEL7 ADR433ARMZ ADR433ARMZ-REEL7 ADR433BRZ ADR433BRZ-REEL7 ADR434ARZ ADR434ARZ-REEL7 ADR434ARMZ ADR434ARMZ-REEL7 ADR434BRZ ADR434BRZ-REEL7 ADR435ARZ ADR435ARZ-REEL7 ADR435ARMZ ADR435ARMZ-REEL7 ADR435BRMZ ADR435BRMZ-R7 ADR435BRZ ADR435BR