Datasheet

ManualsBrandsANALOG DEVICES ManualsLinear ICsLinear IC - Op-amp Multi-purpose SOIC 14

Precision, Low Noise, CMOS, Rail-to-Rail,

Input/Output Operational Amplifiers

Data Sheet

AD8605/AD8606/AD8608

Rev. N Document Feedback

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FEATURES

Low offset voltage: 65 μV maximum

Low input bias currents: 1 pA maximum

Low noise: 8 nV/√Hz

Wide bandwidth: 10 MHz

High open-loop gain: 1000 V/mV

Unity gain stable

Single-supply operation: 2.7 V to 5.5 V

5-ball WLCSP for single (AD8605) and 8-ball WLCSP for

dual (AD8606)

APPLICATIONS

Photodiode amplification

Battery-powered instrumentation

Multipole filters

Sensors

Barcode scanners

Audio

GENERAL DESCRIPTION

The AD8605, AD8606, and AD8608

are single, dual, and quad

rail-to-rail input and output, single-supply amplifiers. They

feature very low offset voltage, low input voltage and current

noise, and wide signal bandwidth. They use the Analog Devices,

Inc. patented DigiTrim® trimming technique, which achieves

superior precision without laser trimming.

The combination of low offsets, low noise, very low input bias

currents, and high speed makes these amplifiers useful in a

wide variety of applications. Filters, integrators, photodiode

amplifiers, and high impedance sensors all benefit from the

combination of performance features. Audio and other ac

applications benefit from the wide bandwidth and low

distortion. Applications for these amplifiers include optical

control loops, portable and loop-powered instrumentation,

and audio amplification for portable devices.

The AD8605, AD8606, and AD8608 are specified over the

extended industrial temperature range (−40°C to +125°C). e

AD8605 single is available in 5-lead SOT-23 and 5-ball WLCSP

packages. The AD8606 dual is available in an 8-lead MSOP, an

8-ball WLSCP, and a narrow SOIC surface-mounted package.

The AD8608 quad is available in a 14-lead TSSOP package and

a narrow 14-lead SOIC package. The 5-ball and 8-ball WLCSP

offer the smallest available footprint for any surface-mounted

operational amplifier. The WLCSP, SOT-23, MSOP, and TSSOP

versions are available in tape-and-reel only.

Protected by U.S. Patent No. 5,969,657.

PIN CONFIGURATIONS

–IN

+IN

V+

OUT

AD8605

TOP VIEW

(Not to Scale)

V–

2731-001

02731-057

TOP VIEW

(BALL SIDE DOWN)

BALL

CORNER

A1 A2 A3

B1 B3

C1 C2 C3

AD8606

+INA V– +INB

–INA –INB

OUTA V+ OUTB

Figure 1. 5-Lead SOT-23 (RJ Suffix) Figure 2. 8-Ball WLCSP (CB Suffix)

AD8605 ONLY

OUT V+

V–

+IN –IN

TOP VIEW

(BUMP SIDE DOWN)

02731-006

–IN A

+IN A

V+

+IN B

–IN B

UT B

OUT D

–IN D

+IN D

V–

+IN C

–IN C

OUT C

OUT A

02731-004

AD8608

TOP VIEW

(Not to Scale)

Figure 3. 5-Ball WLCSP (CB Suffix) Figure 4. 14-Lead SOIC_N (R Suffix)

–IN A

+IN A

V–

OUT B

–IN B

+IN B

V+

UT A

02731-003

AD8606

TOP VIEW

(Not to Scale)

OUT A

–IN A

+IN A

V+

+IN B

–IN B

UT B

–IN D

+IN D

V–

OUT D

–IN C

OUT C

+IN C

02731-002

AD8608

TOP VIEW

(Not to Scale)

Figure 5. 8-Lead MSOP (RM Suffix),

8-Lead SOIC_N (R Suffix)

Figure 6. 14-Lead TSSOP (RU Suffix)

Summary of content (24 pages)

PAGE 1
FEATURES PIN CONFIGURATIONS 4 –IN +IN 3 Photodiode amplification Battery-powered instrumentation Multipole filters Sensors Barcode scanners Audio –IN A 2 1 5 +IN A 3 V+ 4 2 –IN 3 4 –IN B 6 AD8606 8 TOP VIEW (Not to Scale) 4 5 V– +INB C1 C2 C3 14 OUT D 13 –IN D AD8608 12 +IN D TOP VIEW (Not to Scale) V+ OUT B –IN B +IN B 11 V– 10 +IN C 9 –IN C 8 OUT C OUT B 7 Figure 4.
PAGE 2
AD8605/AD8606/AD8608 Data Sheet TABLE OF CONTENTS Features .............................................................................................. 1 THD + Noise............................................................................... 16 Applications ....................................................................................... 1 Total Noise Including Source Resistors ................................... 17 General Description .......................................................
PAGE 3
Data Sheet AD8605/AD8606/AD8608 REVISION HISTORY 4/13—Rev. M to Rev. N Changes to Input Overvoltage Section and THD + Noise Section ......................................................................................... 16 Changes to Total Noise Including Source Resistors Section...... 17 Updated Outline Dimensions ................................................... 24 2/13—Rev. L to Rev. M Updated Outline Dimensions ................................................... 21 Changes to Ordering Guide ......
PAGE 4
AD8605/AD8606/AD8608 Data Sheet 5 V ELECTRICAL SPECIFICATIONS VS = 5 V, VCM = VS/2, TA = 25°C, unless otherwise noted. Table 1. Parameter INPUT CHARACTERISTICS Offset Voltage AD8605/AD8606 (Except WLCSP) AD8608 AD8605/AD8606/AD8608 Input Bias Current AD8605/AD8606 AD8605/AD8606 AD8608 AD8608 Input Offset Current Symbol Conditions Min Typ Max Unit 20 20 80 65 75 300 750 1 50 250 100 300 0.5 20 75 5 µV µV µV µV pA pA pA pA pA pA pA pA V dB dB V/mV 4.5 6.0 µV/°C µV/°C VOS VS = 3.
PAGE 5
Data Sheet Parameter NOISE PERFORMANCE Peak-to-Peak Noise Voltage Noise Density Current Noise Density AD8605/AD8606/AD8608 Symbol Conditions en p-p en en in f = 0.1 Hz to 10 Hz f = 1 kHz f = 10 kHz f = 1 kHz Rev. N | Page 5 of 24 Min Typ Max Unit 2.3 8 6.5 0.01 3.
PAGE 6
AD8605/AD8606/AD8608 Data Sheet 2.7 V ELECTRICAL SPECIFICATIONS VS = 2.7 V, VCM = VS/2, TA = 25°C, unless otherwise noted. Table 2. Parameter INPUT CHARACTERISTICS Offset Voltage AD8605/AD8606 (Except WLCSP) AD8608 AD8605/AD8606/AD8608 Input Bias Current AD8605/AD8606 AD8605/AD8606 AD8608 AD8608 Input Offset Current Symbol Conditions Min Typ Max Unit 20 20 80 65 75 300 750 1 50 250 100 300 0.5 20 75 2.7 µV µV µV µV pA pA pA pA pA pA pA pA V dB dB V/mV 4.5 6.0 µV/°C µV/°C VOS VS = 3.
PAGE 7
Data Sheet Parameter NOISE PERFORMANCE Peak-to-Peak Noise Voltage Noise Density Current Noise Density AD8605/AD8606/AD8608 Symbol Conditions en p-p en en in f = 0.1 Hz to 10 Hz f = 1 kHz f = 10 kHz f = 1 kHz Rev. N | Page 7 of 24 Min Typ Max Unit 2.3 8 6.5 0.01 3.
PAGE 8
AD8605/AD8606/AD8608 Data Sheet ABSOLUTE MAXIMUM RATINGS Table 4. Table 3.
PAGE 9
Data Sheet AD8605/AD8606/AD8608 TYPICAL PERFORMANCE CHARACTERISTICS 4500 0.30 VS = 5V 0.25 0.20 0.15 3000 0.10 VOS (mV) NUMBER OF AMPLIFIERS VS = 5V 4000 TA = 25°C VCM = 0V TO 5V 3500 2500 2000 1500 0.05 0 –0.05 –0.10 –0.15 1000 0 –300 200 100 0 –100 OFFSET VOLTAGE (µV) –200 –0.25 –0.30 300 Figure 7. Input Offset Voltage Distribution 0 0.5 1.0 1.5 2.0 2.5 3.0 VCM (V) 3.5 4.0 VSY = 5V VCM = VSY/2 16 12 8 150 100 50 0 –50 02731-008 0 0 0.4 0.8 1.2 1.6 2.0 2.4 2.8 3.
PAGE 10
AD8605/AD8606/AD8608 Data Sheet 6 5.00 VOH @ 1mA LOAD 5 VS = 5V OUTPUT SWING (V p-p) OUTPUT VOLTAGE (V) 4.95 4.90 4.85 4.80 VS = 5V VIN = 4.9V p-p TA = 25°C RL = 2kΩ AV = 1 4 3 2 VOH @ 10mA LOAD 02731-013 4.70 –40 –25 –10 5 20 35 50 65 80 95 110 0 125 02731-016 1 4.75 1k 10k TEMPERATURE (°C) VS = 5V VS = 5V 90 VOL @ 10mA LOAD 80 OUTPUT IMPEDANCE (Ω) 0.20 0.15 0.10 70 AV = 100 60 50 AV = 10 AV = 1 40 30 20 0.
PAGE 11
Data Sheet AD8605/AD8606/AD8608 1.0 140 VS = 5V 0.9 100 PSRR (dB) 80 60 40 20 0 02731-019 –20 –40 –60 1k 10k 100k FREQUENCY (Hz) 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0 0 10M 1M 02731-022 SUPPLY CURRENT/AMPLIFIER (mA) 120 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 SUPPLY VOLTAGE (V) Figure 19. PSRR vs. Frequency Figure 22. Supply Current/Amplifier vs.
PAGE 12
AD8605/AD8606/AD8608 Data Sheet 36 VS = ±2.5V RL = 10kΩ CL = 200pF AV = 1 VS = ±2.5V 02731-025 VOLTAGE (1V/DIV) VOLTAGE NOISE DENSITY (nV/ Hz) 32 28 24 20 16 12 02731-028 8 4 TIME (400ns/DIV) 0.1 0 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 FREQUENCY (kHz) Figure 28. Voltage Noise Density vs. Frequency Figure 25. Large Signal Transient Response 53.6 VS = ±2.5V RL = 10kΩ AV = –100 VIN = 50mV 0V 0V VIN 02731-026 –50mV 46.9 40.2 33.5 26.8 20.1 13.4 6.7 02731-029 VOUT VS = ±2.
PAGE 13
Data Sheet AD8605/AD8606/AD8608 1k OUTPUT SATURATION VOLTAGE (mV) 1400 1200 1000 800 600 02731-031 400 200 0 –300 –200 –100 0 100 OFFSET VOLTAGE (µV) 100 SOURCE 10 SINK 1 0.1 0.001 300 200 VS = 2.7V TA = 25°C 2.680 300 VS = 2.7V TA = 25°C VS = 2.7V 2.675 OUTPUT VOLTAGE (V) 200 100 0 –100 2.670 2.665 VOH @ 1mA LOAD 2.660 2.655 02731-032 –200 –300 0 0 0.9 1.8 2.650 –40 2.7 –25 –10 5 COMMON-MODE VOLTAGE (V) 50 65 80 95 110 125 0.045 VSY = 2.7V VCM = VSY/2 VS = 2.
PAGE 14
AD8605/AD8606/AD8608 Data Sheet VS = 2.7V RL = 2kΩ CL = 20pF ΦM = 52.5° 40 90 20 45 0 0 GAIN –20 –45 –40 –90 –60 –135 –80 –180 –100 10k 100k 1M FREQUENCY (Hz) 10M 50 40 –OS 30 +OS 20 10 –225 40M 02731-039 135 SMALL SIGNAL OVERSHOOT (%) PHASE PHASE (Degrees) 60 VS = 2.7V TA = 25°C AV = 1 180 02731-036 80 GAIN (dB) 60 225 100 0 10 100 CAPACITANCE (pF) 1k Figure 40. Small Signal Overshoot vs. Load Capacitance Figure 37. Open-Loop Gain and Phase vs. Frequency VS = 2.
PAGE 15
Data Sheet AD8605/AD8606/AD8608 02731-042 VOLTAGE (500mV/DIV) VS = ±1.35V RL = 10kΩ CL = 200pF AV = 1 TIME (400ns/DIV) Figure 43. Large Signal Transient Response Rev.
PAGE 16
AD8605/AD8606/AD8608 Data Sheet APPLICATIONS INFORMATION OUTPUT PHASE REVERSAL VS = ±2.5V VIN = 6V p-p AV = 1 RL = 10kΩ VOLTAGE (2V/DIV) Phase reversal is defined as a change in polarity at the output of the amplifier when a voltage that exceeds the maximum input common-mode voltage drives the input. Phase reversal can cause permanent damage to the amplifier; it can also cause system lockups in feedback loops.
PAGE 17
Data Sheet AD8605/AD8606/AD8608 TOTAL NOISE INCLUDING SOURCE RESISTORS The low input current noise and input bias current of the AD860x make it the ideal amplifier for circuits with substantial input source resistance, such as photodiodes. Input offset voltage increases by less than 0.5 nV per 1 kΩ of source resistance at room temperature and increases to 10 nV at 85°C.
PAGE 18
AD8605/AD8606/AD8608 Data Sheet Figure 50 shows a scope of the output at the snubber circuit. The overshoot is reduced from over 70% to less than 5%, and the ringing is eliminated by the snubber. Optimum values for RS and CS are determined experimentally. 4500 INPUT BIAS CURRENT (pA) 4000 VOLTAGE (100mV/DIV) VS = ±2.5V AV = 1 RL = 10kΩ RS = 90Ω CL = 1000pF CS = 700pF 3500 3mW/cm2 3000 2500 2mW/cm2 2000 1500 1mW/cm2 500 0 350 550 650 WAVELENGTH (nm) 750 850 02731-048 Figure 51.
PAGE 19
Data Sheet AD8605/AD8606/AD8608 I-V CONVERSION APPLICATIONS PHOTODIODE PREAMPLIFIER APPLICATIONS At room temperature, the AD8605 has an input bias current of 0.2 pA and an offset voltage of 100 µV. Typical values of RD are in the range of 1 GΩ. The low offset voltage and input current of the AD8605 make it an excellent choice for photodiode applications. In addition, the low voltage and current noise make the amplifier ideal for application circuits with high sensitivity.
PAGE 20
AD8605/AD8606/AD8608 Data Sheet INSTRUMENTATION AMPLIFIERS R VREF R R CF Difference amplifiers are widely used in high accuracy circuits to improve the common-mode rejection ratio. Figure 54 shows a simple difference amplifier. Figure 55 shows the commonmode rejection for a unity gain configuration and for a gain of 10. RF R2 R2 R2 V+ VOS AD8605 Making (R4/R3) = (R2/R1) and choosing 0.01% tolerance yields a CMRR of 74 dB and minimizes the gain error at the output. R2 10kΩ V– Figure 56.
PAGE 21
Data Sheet AD8605/AD8606/AD8608 OUTLINE DIMENSIONS 0.940 0.900 0.860 2 1 A BALL A1 IDENTIFIER 1.330 1.290 1.250 0.50 B 0.866 BSC REF C TOP VIEW (BALL SIDE DOWN) 0.610 0.555 0.500 0.50 BSC BOTTOM VIEW (BALL SIDE UP) SIDE VIEW COPLANARITY 0.05 0.280 0.260 0.240 0.230 0.200 0.170 02-15-2013-B SEATING PLANE Figure 58. 5-Ball Wafer Level Chip Scale Package [WLCSP] (CB-5-1) Dimensions shown in millimeters 3.00 2.90 2.80 1.70 1.60 1.50 5 1 4 2 3.00 2.80 2.60 3 0.95 BSC 1.90 BSC 0.
PAGE 22
AD8605/AD8606/AD8608 Data Sheet 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 0.80 0.55 0.40 0.23 0.09 6° 0° 0.40 0.25 10-07-2009-B 0.15 0.05 COPLANARITY 0.10 COMPLIANT TO JEDEC STANDARDS MO-187-AA Figure 60. 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 0.10 SEATING PLANE 6.20 (0.2441) 5.80 (0.
PAGE 23
Data Sheet AD8605/AD8606/AD8608 1.480 1.430 1.380 3 2 1 A BALL A1 IDENTIFIER 1.825 1.775 1.725 1.00 REF B C 0.50 BSC TOP VIEW BOTTOM VIEW (BALL SIDE DOWN) 0.675 0.595 0.515 (BALL SIDE UP) 0.380 0.355 0.330 SIDE VIEW COPLANARITY 0.05 0.340 0.320 0.300 0.27 0.24 0.21 08-10-2012-A SEATING PLANE Figure 62. 8-Ball Wafer Level Chip Scale Package [WLCSP] (CB-8-1) Dimensions shown in millimeters 8.75 (0.3445) 8.55 (0.3366) 8 14 1 7 1.27 (0.0500) BSC 0.25 (0.0098) 0.10 (0.
PAGE 24
AD8605/AD8606/AD8608 Data Sheet 5.10 5.00 4.90 14 8 4.50 4.40 4.30 6.40 BSC 1 7 PIN 1 0.65 BSC 1.20 MAX 0.15 0.05 COPLANARITY 0.10 0.30 0.19 0.20 0.09 SEATING PLANE 8° 0° COMPLIANT TO JEDEC STANDARDS MO-153-AB-1 0.75 0.60 0.45 061908-A 1.05 1.00 0.80 Figure 64.