Datasheet

ManualsBrandsAnalog Devices ManualsAmplifiers & ComparatorsOperational Amplifier, Dual, 4 MHz, SOIC-8

Precision Rail-to-Rail

Input and Output Operational Amplifiers

OP184/OP284/OP484

Rev. J

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FEATURES

Single-supply operation

Wide bandwidth: 4 MHz

Low offset voltage: 65 μV

Unity-gain stable

High slew rate: 4.0 V/ μs

Low noise: 3.9 nV/√Hz

APPLICATIONS

Battery-powered instrumentation

Power supply control and protection

Telecommunications

DAC output amplifier

ADC input buffer

GENERAL DESCRIPTION

The OP184/OP284/OP484 are single, dual, and quad single-supply,

4 MHz bandwidth amplifiers featuring rail-to-rail inputs and

outputs. They are guaranteed to operate from 3 V to 36 V (or

±1.5 V to ±18 V).

These amplifiers are superb for single-supply applications requiring

both ac and precision dc performance. The combination of wide

bandwidth, low noise, and precision makes the OP184/OP284/

OP484 useful in a wide variety of applications, including filters

and instrumentation.

Other applications for these amplifiers include portable telecom-

munications equipment, power supply control and protection,

and use as amplifiers or buffers for transducers with wide output

ranges. Sensors requiring a rail-to-rail input amplifier include

Hall effect, piezoelectric, and resistive transducers.

The ability to swing rail-to-rail at both the input and output

enables designers to build multistage filters in single-supply

systems and to maintain high signal-to-noise ratios.

The OP184/OP284/OP484 are specified over the hot extended

industrial temperature range of −40°C to +125°C. The single

OP184 is available in 8-lead SOIC surface mount packages. The

dual OP284 is available in 8-lead PDIP and SOIC surface mount

packages. The quad OP484 is available in 14-lead PDIP and

14-lead, narrow-body SOIC packages.

PIN CONFIGURATIONS

OUT A

V+

DNC

–IN A

+IN A

V–

NOTES

1. NC = NO CONNECT

2. DNC = DO NOT CONNECT

–

00293-001

TOP VIEW

(Not to Scale)

OP184

Figure 1. 8-Lead SOIC (S-Suffix)

00293-002

OUT B

–IN B

+IN B

V+

OUT A

–IN A

+IN A

V–

OP284

TOP VIEW

(Not to Scale)

Figure 2. 8-Lead PDIP (P-Suffix)

8-Lead SOIC (S-Suffix)

OUT A

–IN A

+IN A

V+

+IN B

–IN B

OUT B

OUT D

–IN D

+IN D

V–

+IN C

–IN C

OUT C

OP484

TOP VIEW

(Not to Scale)

00293-003

Figure 3. 14-Lead PDIP (P-Suffix)

14-Lead Narrow-Body SOIC (S-Suffix)

Table 1. Low Noise Op Amps

Voltage Noise 0.9 nV 1.1 nV 1.8 nV 2.8 nV 3.2 nV 3.8 nV 3.9 nV

Single AD797 AD8597 ADA4004-1 AD8675/ADA4075-2 OP27 AD8671 OP184

Dual AD8599 ADA4004-2 AD8676 OP270 AD8672 OP284

Quad ADA4004-4 OP470 AD8674 OP484

Summary of content (24 pages)

PAGE 1
Precision Rail-to-Rail Input and Output Operational Amplifiers OP184/OP284/OP484 FEATURES PIN CONFIGURATIONS Single-supply operation Wide bandwidth: 4 MHz Low offset voltage: 65 μV Unity-gain stable High slew rate: 4.0 V/ μs Low noise: 3.9 nV/√Hz DNC 1 –IN A 2 OP184 8 NC 7 V+ 6 OUT A 5 DNC – +IN A 3 V– 4 TOP VIEW (Not to Scale) 00293-001 + NOTES 1. NC = NO CONNECT 2. DNC = DO NOT CONNECT APPLICATIONS Figure 1.
PAGE 2
OP184/OP284/OP484 TABLE OF CONTENTS Features .............................................................................................. 1 Output Phase Reversal ............................................................... 15 Applications ....................................................................................... 1 General Description ......................................................................... 1 Designing Low Noise Circuits in Single-Supply Applications ....................
PAGE 3
OP184/OP284/OP484 SPECIFICATIONS ELECTRICAL CHARACTERISTICS VS = 5.0 V, VCM = 2.5 V, TA = 25°C, unless otherwise noted. Table 2.
PAGE 4
OP184/OP284/OP484 VS = 3.0 V, VCM = 1.5 V, TA = 25°C, unless otherwise noted. Table 3.
PAGE 5
OP184/OP284/OP484 VS = ±15.0 V, VCM = 0 V, TA = 25°C, unless otherwise noted. Table 4.
PAGE 6
OP184/OP284/OP484 ABSOLUTE MAXIMUM RATINGS Table 5. Parameter Supply Voltage Input Voltage Differential Input Voltage1 Output Short-Circuit Duration to GND Storage Temperature Range P-Suffix, S-Suffix Packages Operating Temperature Range OP184/OP284/OP484E/OP484F Junction Temperature Range P-Suffix, S-Suffix Packages Lead Temperature (Soldering 60 sec) 1 THERMAL RESISTANCE Rating ±18 V ±18 V ±0.
PAGE 7
OP184/OP284/OP484 TYPICAL PERFORMANCE CHARACTERISTICS 270 300 VS = 3V TA = 25°C VCM = 1.5V VS = 5V –40°C ≤ TA ≤ +125°C 250 240 200 180 QUANTITY 150 120 150 100 90 60 00293-005 50 30 0 –100 –75 –50 –25 0 25 50 75 0 100 0 200 180 QUANTITY QUANTITY 1.50 250 150 120 150 100 90 60 00293-006 50 30 0 –100 –75 –50 –25 0 25 50 75 0 100 0 0.25 0.50 0.75 1.00 1.25 1.50 OFFSET VOLTAGE DRIFT, TCVOS (µV/°C) INPUT OFFSET VOLTAGE (µV) Figure 6.
PAGE 8
OP184/OP284/OP484 500 1.50 VS = ±15V 200 100 0 –100 –200 00293-011 –300 –500 –15 –10 –5 0 5 10 1.25 1.00 0.75 0.50 0.25 00293-014 INPUT BIAS CURRENT (nA) 300 –400 TA = 25°C SUPPLY CURRENT/PER AMPLIFIER (mA) 400 0 15 0 ±2.5 ±5.0 COMMON-MODE VOLTAGE (V) ±7.5 ±10.0 ±12.5 ±15.0 ±17.5 ±20.0 SUPPLY VOLTAGE (V) Figure 11. Input Bias Current vs. Common-Mode Voltage Figure 14. Supply Current vs.
PAGE 9
OP184/OP284/OP484 70 60 VS = 3V TA = 25°C NO LOAD 60 50 30 45 20 90 10 135 0 180 –10 225 –20 270 –30 10k 100k 1M 30 20 10 0 –10 –20 00293-020 0 CLOSED-LOOP GAIN (dB) 40 PHASE SHIFT (Degrees) 40 00293-017 OPEN-LOOP GAIN (dB) VS = 5V RL = 2kΩ TA = 25°C 50 –30 –40 10 10M 100 1k FREQUENCY (Hz) Figure 17. Open-Loop Gain and Phase vs.
PAGE 10
OP184/OP284/OP484 300 AV = +10 MAXIMUM OUTPUT SWING (V p-p) OUTPUT IMPEDANCE (Ω) 240 AV = +100 210 180 150 120 90 AV = +1 30 0 10 100 1k 10k 100k 1M 3 2 1 00293-023 60 4 0 1k 10M VS = 5V VIN = 0.5V TO 4.5V RL = 2kΩ TA = 25°C 00293-026 270 5 VS = 5V TA = 25°C 10k 100k FREQUENCY (Hz) Figure 23. Output Impedance vs. Frequency 30 25 240 210 20 AV = +10 AV = +100 VOUT (V) OUTPUT IMPEDANCE (Ω) VS = ±15V VIN = ±14V RL = 2kΩ TA = 25°C VS = 15V TA = 25°C 180 10M Figure 26.
PAGE 11
OP184/OP284/OP484 30 160 25 NOISE DENSITY (nV/ Hz) 120 PSRR (dB) 100 80 VS = ±15V 60 40 VS = +5V 20 0 20 15 10 100 1k 10k 100k 1M 00293-029 5 VS = +3V –20 –40 10 ±2.5V ≤ VS ≤ ±15V TA = 25°C 00293-032 140 TA = 25°C 0 1 10M 10 Figure 29. PSRR vs. Frequency 10 OVERSHOOT (%) 60 –OS 40 +OS 30 20 00293-030 10 0 10 100 ±2.5V ≤ VS ≤ ±15V TA = 25°C 8 6 4 2 00293-033 CURRENT NOISE DENSITY (pA/ Hz) VS = ±2.5V TA = 25°C, AVCL = 1 70 V = ±50mV IN 50 1000 Figure 32.
PAGE 12
OP184/OP284/OP484 160 10 VS = ±15V TA = 25°C TA = 25°C 140 CHANNEL SEPARATION (dB) 6 STEP SIZE (V) 4 2 0.1% 0 0.01% –2 –4 00293-035 –6 –8 –10 0 1 2 3 4 5 120 VS = ±15V 100 80 60 VS = +3V 40 20 0 00293-038 8 –20 –40 100 6 1k 10k 100k 1M 10M FREQUENCY (Hz) SETTLING TIME (µs) Figure 35. Step Size vs. Settling Time Figure 38. Channel Separation vs. Frequency 0.3 VS = 5V AV = +1 RL = OPEN CL = 300pF TA = 25°C VS = ±2.5V AV = 10M 0.2 100 400mV 90 0V 10 NOISE (µV) 0.
PAGE 13
OP184/OP284/OP484 0.1 VS = ±1.5V AV = +1 NO LOAD TA = 25°C 100 90 THD+N (%) +200mV VO = ±0.75V 0V –200mV AV = +1000 VS = ±2.5V RL = 2kΩ 0.01 VO = ±2.5V 10 500ns VO = ±1.5V 0.001 0.0005 20 100 00293-043 100mV 00293-041 0% 1k 10k FREQUENCY (Hz) Figure 41. Small Signal Transient Response VS = ±0.75V AV = +1 NO LOAD TA = 25°C 100 +200mV Figure 43. Total Harmonic Distortion + Noise vs. Frequency 90 0V 10 0% 100mV 1µs 00293-042 –200mV Figure 42.
PAGE 14
OP184/OP284/OP484 APPLICATIONS INFORMATION FUNCTIONAL DESCRIPTION The OP184/OP284/OP484 are precision single-supply, rail-to-rail operational amplifiers. Intended for the portable instrumentation marketplace, the OPx84 family of devices combine the attributes of precision, wide bandwidth, and low noise to make them a superb choice in single-supply applications that require both ac and precision dc performance.
PAGE 15
OP184/OP284/OP484 external clamping diodes, with the anode connected to ground and the cathode to the inputs, prevent input signal excursions from exceeding the negative supply of the device (that is, GND), preventing a condition that causes the output voltage to change phase. JFET-input amplifiers can also exhibit phase reversal; and, if so, a series input resistor is usually required to prevent it.
PAGE 16
OP184/OP284/OP484 As a design aid, Figure 49 shows the total equivalent input noise of the OP284 and the total thermal noise of a resistor for comparison. Note that for source resistance less than 1 kΩ, the equivalent input noise voltage of the OP284 is dominant. 10 NOISE FIGURE (dB) 8 FREQUENCY = 1kHz TA = 25°C OP284 TOTAL EQUIVALENT NOISE 7 6 5 4 3 00293-050 2 10 1 0 100 RESISTOR THERMAL NOISE ONLY 10k 100k TOTAL SOURCE RESISTANCE, RS (Ω) Figure 49. OP284 Equivalent Thermal Noise vs.
PAGE 17
OP184/OP284/OP484 1 f (3 dB ) = 2π R 4 C 2 RP1 1kΩ 5 3 2 A1 1 R3 1.1kΩ 2 1 2.5VREF 4 R2 100kΩ P1 5kΩ RESISTORS = 1%, 100ppm/°C POTENTIOMETER = 10 TURN, 100ppm/°C Figure 53. 2.5 V Reference That Operates on a Single 3 V Supply 6 5V 1.23V 8 7 A2 The OP284 is ideal for use with a CMOS DAC to generate a digitally controlled voltage with a wide output range. Figure 54 shows a DAC8043 used in conjunction with the AD589 to generate a voltage output from 0 V to 1.23 V.
PAGE 18
OP184/OP284/OP484 HIGH-SIDE CURRENT MONITOR 5V R Monitor Output = R2 ×  SENSE  × I L  R1  For the element values shown, the transfer characteristic of the monitor output is 2.5 V/A. RSENSE 0.1Ω 1/2 VIN 100mV p-p OP284 VOUT RS 50Ω CS 100nF Figure 56. Snubber Network Compensates for Capacitive Load The first step is to determine the value of Resistor RS. A good starting value is 100 Ω (typically, the optimum value is less than 100 Ω).
PAGE 19
OP184/OP284/OP484 LOW DROPOUT REGULATOR WITH CURRENT LIMITING For this example, because VOUT of 4.5 V with VOUT2 = 2.5 V requires a U1B gain of 1.8 times, R3 and R2 are chosen for a ratio of 1.2:1 or 10.0 k Ω:8.06 kΩ (using closest 1% values). Note that for the lowest VOUT dc error, R2||R3 should be maintained equal to R1 (as in this example), and the R2 to R3 resistors should be stable, close tolerance metal film types. The table in Figure 58 summarizes R1 to R3 values for some popular voltages.
PAGE 20
OP184/OP284/OP484 Performance of the circuit is excellent. For the 4.5 V output version, the measured dc output change for a 225 mA load change was on the order of a few microvolts, while the dropout voltage at this same current level was about 30 mV. The current limit, as shown in Figure 58, is 400 mA, allowing the circuit to be used at levels up to 300 mA or more. While the Q1 device can actually support currents of several amperes, a practical current rating takes into account the 2.
PAGE 21
OP184/OP284/OP484 OUTLINE DIMENSIONS 0.400 (10.16) 0.365 (9.27) 0.355 (9.02) 8 5 1 0.280 (7.11) 0.250 (6.35) 0.240 (6.10) 4 0.100 (2.54) BSC 0.325 (8.26) 0.310 (7.87) 0.300 (7.62) 0.060 (1.52) MAX 0.210 (5.33) MAX 0.015 (0.38) MIN 0.150 (3.81) 0.130 (3.30) 0.115 (2.92) SEATING PLANE 0.022 (0.56) 0.018 (0.46) 0.014 (0.36) 0.195 (4.95) 0.130 (3.30) 0.115 (2.92) 0.015 (0.38) GAUGE PLANE 0.014 (0.36) 0.010 (0.25) 0.008 (0.20) 0.430 (10.92) MAX 0.005 (0.13) MIN 0.070 (1.78) 0.060 (1.52) 0.045 (1.
PAGE 22
OP184/OP284/OP484 5.00 (0.1968) 4.80 (0.1890) 5 1 6.20 (0.2441) 5.80 (0.2284) 4 1.27 (0.0500) BSC 0.25 (0.0098) 0.10 (0.0040) 1.75 (0.0688) 1.35 (0.0532) 0.51 (0.0201) 0.31 (0.0122) COPLANARITY 0.10 SEATING PLANE 0.50 (0.0196) 0.25 (0.0099) 45° 8° 0° 0.25 (0.0098) 0.17 (0.0067) 1.27 (0.0500) 0.40 (0.
PAGE 23
OP184/OP284/OP484 ORDERING GUIDE Model1 OP184ES OP184ES-REEL OP184ES-REEL7 OP184ESZ OP184ESZ-REEL OP184ESZ-REEL7 OP184FS OP184FS-REEL OP184FS–REEL7 OP184FSZ OP184FSZ-REEL OP184FSZ-REEL7 OP284EP OP284EPZ OP284ES OP284ES-REEL OP284ES-REEL7 OP284ESZ OP284ESZ-REEL OP284ESZ-REEL7 OP284FS OP284FS-REEL OP284FS-REEL7 OP284FSZ OP284FSZ-REEL OP284FSZ-REEL7 OP484ES OP484ES-REEL OP484ESZ OP484ESZ-REEL OP484FPZ OP484FS OP484FS-REEL OP484FS-REEL7 OP484FSZ OP484FSZ-REEL OP484FSZ-REEL7 1 Temperature Range −40°C to +125°C