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PDF AD8476 Data sheet ( Hoja de datos )
| Número de pieza | AD8476 | |
| Descripción | Fully Differential Amplifier and ADC Driver | |
| Fabricantes | Analog Devices | |
| Logotipo |  |
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Data Sheet
Low Power, Unity Gain, Fully
Differential Amplifier and ADC Driver
AD8476
FEATURES
Very low power
330 μA supply current
Extremely low harmonic distortion
−126 HD2 at 10 kHz
−128 HD3 at 10 kHz
Fully differential or single-ended inputs/outputs
Differential output designed to drive precision ADCs
Drives switched capacitor and Σ-Δ ADCs
Rail-to-rail outputs
VOCM pin adjusts output common mode
Robust overvoltage up to 18 V beyond supplies
High performance
Suitable for driving 16-bit converter up to 250 kSPS
39 nV/√Hz output noise
1 ppm/°C gain drift maximum
200 μV maximum output offset
10 V/μs slew rate
6 MHz bandwidth
Single supply: 3 V to 18 V
Dual supplies: ±1.5 V to ±9 V
APPLICATIONS
ADC driver
Differential instrumentation amplifier building block
Single-ended-to-differential converter
Battery-powered instruments
GENERAL DESCRIPTION
The AD8476 is a very low power, fully differential precision
amplifier with integrated gain resistors for unity gain. It is an ideal
choice for driving low power, high performance ADCs as a
single-ended-to-differential or differential-to-differential
amplifier. It provides a precision gain of 1, common-mode level
shifting, low temperature drift, and rail-to-rail outputs for
maximum dynamic range.
The AD8476 also provides overvoltage protection from large
industrial input voltages up to ±23 V while operating on a dual 5 V
supply. Power dissipation on a single 5 V supply is only 1.5 mW.
The AD8476 works well with SAR, Σ-Δ, and pipeline converters.
The high current output stage of the part allows it to drive the
FUNCTIONAL BLOCK DIAGRAM
10kΩ
10kΩ
10kΩ
AD8476
10kΩ
NOTES
1. NC = NO CONNECT.
DO NOT CONNECT TO THIS PIN.
Figure 1. 8-Lead MSOP
INP 1
INP 2
INN 3
INN 4
10kΩ
10kΩ
10kΩ
AD8476
10kΩ
12 NC
11 –OUT
10 +OUT
9 VOCM
NOTES
1. NC = NO CONNECT. DO NOT CONNECT TO THIS PIN.
Figure 2. 16-Lead LFCSP
switched capacitor front-end circuits of many ADCs with
minimal error.
Unlike many differential drivers on the market, the AD8476 is
a high precision amplifier. With 200 µV maximum output
offset, 39 nV/√Hz noise, and −102 dB THD + N at 10 kHz, the
AD8476 pairs well with low power, high accuracy converters.
Considering its low power consumption and high precision, the
slew-enhanced AD8476 has excellent speed, settling to 16-bit
precision for 250 kSPS acquisition times.
The AD8476 is available in space-saving 16-lead, 3 mm × 3 mm
LFCSP and 8-lead MSOP packages. It is fully specified over the
−40°C to +125°C temperature range.
Rev. B
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibilityisassumedbyAnalogDevices for itsuse,nor foranyinfringementsofpatentsor other
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.461.3113 ©2011–2012 Analog Devices, Inc. All rights reserved.
1 page  
Data Sheet
ABSOLUTE MAXIMUM RATINGS
Table 2.
Parameter
Supply Voltage
Maximum Voltage at Any Input Pin
Minimum Voltage at Any Input Pin
Storage Temperature Range
Specified Temperature Range
Package Glass Transition Temperature (TG)
ESD (Human Body Model)
Rating
±10 V
+VS + 18 V
−VS – 18 V
−65°C to +150°C
−40°C to +125°C
150°C
2500 V
Stresses 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.
AD8476
THERMAL RESISTANCE
The θJA values in Table 3 assume a 4-layer JEDEC standard
board with zero airflow.
Table 3. Thermal Resistance
Package Type
8-Lead MSOP
16-Lead LFCSP, 3 mm × 3 mm
θJA
209.0
78.5
Unit
°C/W
°C/W
MAXIMUM POWER DISSIPATION
The maximum safe power dissipation for the AD8476 is limited
by the associated rise in junction temperature (TJ) on the die. At
approximately 150°C, which is the glass transition temperature,
the properties of the plastic change. Even temporarily exceeding
this temperature limit may change the stresses that the package
exerts on the die, permanently shifting the parametric performance
of the amplifiers. Exceeding a temperature of 150°C for an
extended period may result in a loss of functionality.
ESD CAUTION
Rev. B | Page 5 of 24
5 Page 
Data Sheet
5
0
–5
–10
–15
–20
–25
1k
VOCM = 1.0V
VOCM = 2.5V
VOCM = 4.0V
10k 100k 1M
FREQUENCY (Hz)
10M
Figure 23. Small Signal Frequency Response for Various VOCM Levels
5
POSITIVE OUTPUT (2kΩ LOAD)
NEGATIVE OUTPUT (2kΩ LOAD)
0
VS = 5V
–5
–10
–15
–20
–25
–30
1k
10k 100k 1M 10M
VOCM INPUT FREQUENCY (Hz)
Figure 24. VOCM Small Signal Frequency Response
VS = ±5V
VS = +5V
VS = +3V
AD8476
5
0
–5
–10
–15
–20
–25
–30
–35
1k
CL = 5pF
CL = 10pF
CL = 15pF
10k
100k
FREQUENCY (Hz)
1M
10M
Figure 26. Large Signal Frequency Response for Various VOCM Level
5
POSITIVE OUTPUT
NEGATIVE OUTPUT
0
–5
–10
–15
–20
–25
–30
1k
10k 100k 1M
VOCM INPUT FREQUENCY (Hz)
Figure 27. VOCM Large Signal Frequency Response
VS = ±5V
VS = +5V
VS = +3V
500ns/DIV
Figure 25. Small Signal Pulse Response for Various Supplies
500ns/DIV
Figure 28. Large Signal Pulse Response for Various Supplies
Rev. B | Page 11 of 24
11 Page | ||
| Páginas | Total 24 Páginas | |
| PDF Descargar | [ Datasheet AD8476.PDF ] | |
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