FEATURES
AD8605/AD8606/AD8608
PIN CONFIGURATIONS
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 AD86081 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). The 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.
1
Protected by U.S. Patent No. 5,969,657.
OUT1AD86055V+V–2TOP VIEW(Not to Scale)10+IN34–IN0-13720Figure 1. 5-Lead SOT-23 (RJ Suffix)
TOPVIEW(BUMP SIDE DOWN)OUTV+15V–2+IN–IN34600-1AD8605 ONLY3720Figure 3. 5-Ball WLCSP (CB Suffix) OUT A1–IN AAD86068V++IN ATOP VIEWOUT B30(Not to Scale)–IN B0-13V–45+IN B720Figure 5. 8-Lead MSOP (RM Suffix),
8-Lead SOIC_N (R Suffix)
BALLA1CORNEROUTAV+OUTBA1A2A3–INA–INBB1B3+INAV–+INBC1C2C3750-13720AD8606TOP VIEW(BALL SIDE DOWN)Figure 2. 8-Ball WLCSP (CB Suffix)
OUT A114OUT D–IN A213–IN D+IN A3AD860812+IN DV+4TOP VIEW(Not to Scale)11V–+IN B510+IN C–IN B69–IN C400-OUT B78OUT C13720Figure 4. 14-Lead SOIC_N (R Suffix)
OUT A114OUT D–IN A+IN AAD8608–IN DV+TOP VIEW+IN D(Not to Scale)V–+IN B+IN C2–IN B–IN C00-1OUT B78OUT C3720Figure 6. 14-Lead TSSOP (RU Suffix)
AD8605/AD8606/AD8608
1008060PHASE40200GAIN–20–40–60–80–10010k100k1MFREQUENCY (Hz)10M–45–90–135–180–22540M02731-036Data Sheet
225VS = 2.7VRL = 2kΩCL = 20pFΦM = 52.5°1801359045060VS = 2.7VTA = 25°CAV = 1SMALL SIGNAL OVERSHOOT (%)50PHASE (Degrees)40–OS30+OS20GAIN (dB)1002731-039010100CAPACITANCE (pF)1kFigure 37. Open-Loop Gain and Phase vs. Frequency
3.0Figure 40. Small Signal Overshoot vs. Load Capacitance
VS = 2.7V2.5OUTPUT SWING (V p-p)2.01.5VS = 2.7VVIN = 2.6V p-pTA = 25°CRL = 2kΩAV = 11.001k10k100kFREQUENCY (Hz)1M02731-03710MTIME (1s/DIV)Figure 38. Closed-Loop Output Voltage Swing vs. Frequency (FPBW)
1009080OUTPUT IMPEDANCE (Ω)Figure 41. 0.1 Hz to 10 Hz Input Voltage Noise
VS = 2.7VVS = ±1.35VRL = 10kΩCL = 200pFAV = 1AV = 100AV = 106050403020AV = 101k10k100k1MFREQUENCY (Hz)10M100MTIME (200ns/DIV)Figure 39. Output Impedance vs. Frequency Figure 42. Small Signal Transient Response
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02731-0411002731-038VOLTAGE (50mV/DIV)7002731-0400.5VOLTAGE NOISE (1µV/DIV)AD8605/AD8606/AD8608 APPLICATIONS INFORMATION
OUTPUT PHASE REVERSAL
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. The AD8605 does not exhibit phase reversal even for inputs exceeding the supply voltage by more than 2 V.
VS = ±2.5VVIN = 6V p-pAV = 1RL = 10kΩVOUTData Sheet
VOLTAGE (2V/DIV)VINMAXIMUM POWER DISSIPATION
Power dissipated in an IC causes the die temperature to increase, which can affect the behavior of the IC and the application circuit performance.
The absolute maximum junction temperature of the AD8605/ AD8606/AD8608 is 150°C. Exceeding this temperature could damage or destroy the device.
POWER DISSIPATION (W)02731-043TIME (4µs/DIV)Figure 46. No Phase Reversal
1.81.7SOIC-141.61.51.4TSSOP-141.31.21.11.0SOIC-80.90.80.70.6MSOP-80.5WLCSP-50.40.35-LEAD SOT-230.20.103080555–45–20AMBIENT TEMPERATURE (°C)The maximum power dissipation of the amplifier is calculated according to
PDISS=TJ−TAθJAFigure 47 compares the maximum power dissipation with temperature for the various AD860x family packages.
105130INPUT OVERVOLTAGE PROTECTION
The AD860x has internal protective circuitry. However, if the voltage applied at either input exceeds the supplies by more than 0.5 V, external resistors should be placed in series with the inputs. The resistor values can be determined by
Figure 47. Maximum Power Dissipation vs. Ambient Temperature
0.1VSY = ±2.5VAV = 1BW = 80kHzVIN−VS≤5mARSThe remarkable low input offset current of the AD860x (<1 pA) allows the use of larger value resistors. With a 10 kΩ resistor at the input, the output voltage has less than 10 nV of error voltage. A 10 kΩ resistor has less than 13 nV/√Hz of thermal noise at room temperature.
THD + NOISE (%)0.010.0010.0001THD + NOISE
Total harmonic distortion is the ratio of the input signal in V rms to the total harmonics in V rms throughout the spectrum. Harmonic distortion adds errors to precision measurements and adds unpleasant sonic artifacts to audio systems.
The AD860x has a low total harmonic distortion. Figure 48 shows that the AD8605 has less than 0.005% or −86 dB of THD + N over the entire audio frequency range. The AD8605 is configured in positive unity gain, which is the worst case, and with a load of 10 kΩ.
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201001kFREQUENCY (Hz)10k20kFigure 48. THD + Noise vs. Frequency
02731-04502731-044where:
TJ is the junction temperature. TA is the ambient temperature.
θJA is the junction-to-ambient thermal resistance.
Data Sheet AD8605/AD8606/AD8608
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AD8605/AD8606/AD8608
5.105.004.90Data Sheet
1484.504.404.30176.40BSCPIN 10.65 BSC1.051.000.800.150.05COPLANARITY0.101.20MAX0.200.098°0°0.300.19SEATINGPLANE0.750.600.45061908-ACOMPLIANT TO JEDEC STANDARDS MO-153-AB-1
Figure 66. 14-Lead Thin Shrink Small Outline Package [TSSOP]
(RU-14)
Dimensions shown in millimeters and (inches)
ORDERING GUIDE
Model1
AD8605ACBZ-REEL7 AD8605ARTZ-R2 AD8605ARTZ-REEL AD8605ARTZ-REEL7 AD8606ARM-REEL AD8606ARMZ-R7 AD8606ARMZ-REEL AD8606ARZ
AD8606ARZ-REEL AD8606ARZ-REEL7 AD8606ACBZ-REEL7 AD8608ARZ
AD8608ARZ-REEL AD8608ARZ-REEL7 AD8608ARUZ
AD8608ARUZ-REEL
1
Temperature Range −40°C to +125°C −40°C to +125°C −40°C to +125°C −40°C to +125°C −40°C to +125°C −40°C to +125°C −40°C to +125°C −40°C to +125°C −40°C to +125°C −40°C to +125°C −40°C to +125°C −40°C to +125°C −40°C to +125°C −40°C to +125°C −40°C to +125°C −40°C to +125°C Package Description 5-Ball WLCSP 5-Lead SOT-23 5-Lead SOT-23 5-Lead SOT-23 8-Lead MSOP 8-Lead MSOP 8-Lead MSOP 8-Lead SOIC_N 8-Lead SOIC_N 8-Lead SOIC_N 8-Ball WLCSP 14-Lead SOIC_N 14-Lead SOIC_N 14-Lead SOIC_N 14-Lead TSSOP 14-Lead TSSOP Package Option CB-5-1 RJ-5 RJ-5 RJ-5 RM-8 RM-8 RM-8 R-8 R-8 R-8 CB-8-1 R-14 R-14 R-14 RU-14 RU-14 Marking Code A1J B3A# B3A# B3A# B6A B6A# B6A#
B6A#
Z = RoHS Compliant Part, # denotes RoHS compliant product (except for CB-5-1) may be top or bottom marked.
©2002–2017 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. D02731-0-11/17(O)
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