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AD8672ARMZ-REEL-AD8672ARZ-AD8672ARZ-REEL7
Dual Precision Very Low Noise, Low Input Bias Current Operational Amplifier
Precision, Very Low Noise, Low Input
Bias Current Operational Amplifiers
Rev. B
FEATURES
Very low noise: 2.8 nV/√Hz, 77 nV p-p
Wide bandwidth: 10 MHz
Low input bias current: 12 nA max
Low offset voltage: 75 µV max
High open-loop gain: 120 dB min
Low supply current: 3 mA per amplifier
Dual-supply operation: ±5 V to ±15 V
Unity gain stable
No phase reversal
APPLICATIONS
PLL filters
Filters for GPS
Instrumentation
Sensors and controls
Professional quality audio
GENERAL DESCRIPTION The AD8671/AD8672/AD8674 are very high precision
amplifiers featuring very low noise, very low offset voltage and
drift, low input bias current, 10 MHz bandwidth, and low power
consumption. Outputs are stable with capacitive loads of over
1000 pF. Supply current is less than 3 mA per amplifier at 30 V.
The AD8671’s combination of ultralow noise, high precision,
speed, and stability is unmatched, while the MSOP version
requires only half the board space of comparable amplifiers.
Applications for these amplifiers include high quality PLL
filters, precision filters, medical and analytical instrumentation,
precision power supply controls, ATE, data acquisition, and
precision controls as well as professional quality audio.
The AD8671/AD8672/AD8674 are specified over the extended
industrial (–40°C to +125°C) temperature range.
The AD8671/AD8672 are available in the 8-lead SOIC and
8-lead MSOP packages. The AD8674 is available in 14-lead
SOIC and 14-lead TSSOP packages.
Surface-mount devices in MSOP packages are available in tape
and reel only.
PIN CONFIGURATIONS
NC = NO CONNECT
OUT03718-B
-001
NC = NO CONNECT
OUT03718-B
Figure 1. 8-Lead SOIC (R Suffix)
Figure 2. 8-Lead MSOP (RM Suffix)
OUT A1
–IN A2
+IN A34
OUT B
–IN B
+IN B03718-B
OUT A1
–IN A2
+IN A34
OUT B
–IN B
+IN B
03718-B
Figure 3. 8-Lead SOIC (R Suffix)
Figure 4. 8-Lead MSOP (RM Suffix)
OUT A
–IN A
+IN A
+IN B
–IN B
OUT B
OUT D
–IN D
+IN D
+IN C
–IN C
OUT C03718-B
OUT A
–IN A
+IN A
–IN B
+IN B
OUT B
OUT D
–IN D
+IN D
+IN C
–IN C
OUT C
03718-B
Figure 5. 14-Lead SOIC (R Suffix)
Figure 6. 14-Lead TSSOP (RU Suffix)
TABLE OF CONTENTS Specifications.....................................................................................3
Electrical Characteristics, ±5.0 V................................................3
Electrical Characteristics, ±15 V.................................................4
Absolute Maximum Ratings............................................................5
Typical Performance Characteristics.............................................6
Applications.....................................................................................11
Unity Gain Follower Applications............................................11
Output Phase Reversal...............................................................11
Total Noise vs. Source Resistance.............................................11
THD + Noise...............................................................................12
Driving Capacitive Loads..........................................................12
GPS Receiver...............................................................................13
Band-Pass Filter..........................................................................13
PLL Synthesizers and Loop Filters...........................................13
Outline Dimensions.......................................................................14
Ordering Guide...............................................................................16
REVISION HISTORY
4/04—Data Sheet Changed from Rev. A to Rev. B Changes to Figure 32..................................................................11
Changes to Figures 36, 37, and 38.............................................12
1/04—Data Sheet Changed from Rev. 0 to Rev. A Added AD8672 and AD8674 parts..............................Universal
Changes to Specifications............................................................3
Deleted Figure 3............................................................................6
Changes to Figures 7, 8, and 9.....................................................6
Changes to Figure 37..................................................................12
Added new Figure 32.................................................................10
SPECIFICATIONS
ELECTRICAL CHARACTERISTICS, ±5.0 V
Table 1. VS = ±5.0 V, VCM = 0 V, TA = 25°C, unless otherwise noted ELECTRICAL CHARACTERISTICS, ±15 V
Table 2. VS = ±15 V, VCM = 0 V, TA = 25°C, unless otherwise noted ABSOLUTE MAXIMUM RATINGS
Table 3. AD8671/AD8672/AD8674 Stress Ratings1Stresses above those listed under Absolute Maximum Ratings
may cause permanent damage to the device. This is a stress
rating only; functional operation of the device at these or any
other conditions above those indicated in the operational
section of this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect
device reliability.
1 Absolute maximum ratings apply at 25°C, unless otherwise noted.
Table 4. Package Characteristics 2 θJA is specified for the worst-case conditions, i.e., θJA is specified for device
soldered in circuit board for surface-mount packages.
ESD CAUTION ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate on
the human body and test equipment and can discharge without detection. Although this product features
proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high energy
electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid performance
degradation or loss of functionality.
TYPICAL PERFORMANCE CHARACTERISTICS 03718-B
FREQUENCY (Hz)
VOLTA
GE N
ISE D
ITY (
V/ H0102030405060708090100
Figure 7. Voltage Noise Density vs. Frequency
03718-B
FREQUENCY (kHz)
VOLTA
GE N
ISE D
ITY (
V/ H
31.50.10.20.30.40.50.60.70.80.91.0
Figure 8. Voltage Noise Density vs. Frequency
03718-B
FREQUENCY (kHz)
VOLTA
GE N
ISE D
ITY (
V/ H110234567890
17.5
Figure 9. Voltage Noise Density vs. Frequency
VOS(µV)
–25–5–15045–30–20–1051015202530354003718-B
Figure 10. Input Offset Voltage Distribution
VOS(µV)
AM
–25–5–15050–30–20–1051015202530354003718-B
-011
45Figure 11. Input Offset Voltage Distribution
TEMPERATURE (°C)
–40852512503718-B
Figure 12. Input Offset Voltage vs. Temperature
(nA)
TEMPERATURE (°C)
–40852512503718-B
Figure 13. Input Bias Current vs. Temperature
(nA)
TEMPERATURE (°C)
–40852512503718-B
Figure 14. Input Bias Current vs. Temperature
ISY
(mA)
TEMPERATURE (°C)
–40852512503718-B
Figure 15. Supply Current vs. Temperature
OUTPUT VOLTAGE (V)
TEMPERATURE (°C)
–40852512503718-B
Figure 16. Output Voltage High vs. Temperature
OUTPUT VOLTAGE (V)
TEMPERATURE (°C)
–40852512503718-B
Figure 17. Output Voltage Low vs. Temperature
FREQUENCY (Hz)
OOP
GA
(d
100k03718-B
-018
10M1M
PEN
PH
(d
225270Figure 18. Open-Loop Gain and Phase Shift vs. Frequency
/mV)
TEMPERATURE (°C)
–40852512503718-B
Figure 19. Open-Loop Gain vs. Temperature
FREQUENCY (Hz)1M
GA
100k10k10M03718-B
–50100M
Figure 20. Closed-Loop Gain vs. Frequency
FREQUENCY (Hz)10M
NCE
100k10k100M03718-B
100
Figure 21. Output Impedance vs. Frequency
03718-B
VOLTA
GE (
V/D
IV)
TIME (100µs/DIV)
Figure 22. Large Signal Transient Response
03718-B
VOLTA
GE (
50mV/D
IV)
TIME (10µs/DIV)
Figure 23. Small Signal Transient Response
CAPACITANCE (pF)
OV
OOT (
10010k03718-B
Figure 24. Small Signal Overshoot vs. Load Capacitance
