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PDF AD8475 Data sheet ( Hoja de datos )
| Número de pieza | AD8475 | |
| Descripción | Fully Differential Funnel Amplifier | |
| Fabricantes | Analog Devices | |
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Data Sheet
Precision, Selectable Gain,
Fully Differential Funnel Amplifier
AD8475
FEATURES
Precision attenuation: G = 0.4, G = 0.8
Fully differential or single-ended input/output
Differential output designed to drive precision ADCs
Drives switched capacitor and Σ-Δ ADCs
Rail-to-rail output
VOCM pin adjusts output common-mode voltage
Robust overvoltage protection up to ±15 V (VS = +5 V)
Single supply: 3 V to 10 V
Dual supplies: ±1.5 V to ±5 V
High performance
Suited for driving 18-bit converters up to 4 MSPS
10 nV/√Hz output noise
3 ppm/°C gain drift
500 μV maximum output offset
50 V/μs slew rate
Low power: 3.2 mA supply current
APPLICATIONS
ADC drivers
Differential instrumentation amplifier building blocks
Single-ended-to-differential converters
GENERAL DESCRIPTION
The AD8475 is a fully differential, attenuating amplifier with
integrated precision gain resistors. It provides precision attenuation
(by 0.4 or 0.8), common-mode level shifting, and single-ended-to-
differential conversion along with input overvoltage protection.
Power dissipation on a single 5 V supply is only 16 mW.
The AD8475 is a simple to use, fully integrated precision gain
block, designed to process signal levels of up to ±10 V on a single
supply. It provides a complete interface to make industrial level
signals directly compatible with the differential input ranges of low
voltage high performance 16-bit or 18-bit single-supply successive
approximation (SAR) analog-to-digital converters (ADCs).
The AD8475 comes with two standard pin-selectable gain
options: 0.4 and 0.8. The gain of the part is set by driving the
input pin corresponding to the appropriate gain.
The AD8475 also provides overvoltage protection from large
industrial input voltages up to ±15 V while operating on a single
5 V supply. The VOCM pin adjusts the output voltage common
mode for precision level shifting, to match the ADC’s input range
and maximize dynamic range.
Rev. C
Document Feedback
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.
FUNCTIONAL BLOCK DIAGRAMS
+IN 0.4x 1
+IN 0.8x 2
–IN 0.8x 3
–IN 0.4x 4
1.25kΩ
1.25kΩ
1.25kΩ
1.25kΩ
1kΩ
AD8475
1kΩ
12 NC
11 –OUT
10 +OUT
9 VOCM
NC = NO CONNECT
Figure 1. 16-Lead LFCSP
1.25kΩ
1kΩ
1.25kΩ
1.25kΩ
1.25kΩ
AD8475
1kΩ
NC = NO CONNECT
Figure 2. 10-Lead MSOP
The AD8475 works extremely well with SAR, Σ-Δ, and pipeline
converters. The high current output stage of the part allows it to
drive the switched capacitor front-end circuits of many ADCs with
minimal error.
Unlike many differential drivers in the market, the AD8475 is a
high precision amplifier. With 500 µV maximum output offset,
10 nV/√Hz output noise, and −112 dB THD + N, the AD8475
pairs well with high accuracy converters. Considering its low power
consumption and high precision, the slew-enhanced AD8475 has
excellent speed, settling to 18-bit precision for 4 MSPS acquisition.
The AD8475 is available in a space-saving 16-lead 3 mm × 3 mm
LFCSP package and a 10-lead MSOP package. It is fully specified
over the −40°C to +85°C temperature range.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700 ©2010–2014 Analog Devices, Inc. All rights reserved.
Technical Support
www.analog.com
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
Operating Temperature Range
Junction Temperature
ESD (FICDM)
ESD (HBM)
Rating
11 V
+VS + 10.5 V
−VS − 16 V
−65°C to +150°C
−40°C to +85°C
−40°C to +125°C
150°C
1500 V
2000 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.
AD8475
THERMAL RESISTANCE
θJA is specified for the worst-case conditions, that is, a device
soldered in a circuit board for surface-mount packages.
Table 3. Thermal Resistance
Package Type
16-Lead LFCSP (Exposed Pad)
10-Lead MSOP
θJA
84.90
214.0
Unit
°C/W
°C/W
ESD CAUTION
Rev. C | Page 5 of 24
5 Page 
Data Sheet
0
–7.96
–10
CL = 0pF
CL = 5pF
CL = 10pF
–20
–30
–40
1k
10k 100k 1M 10M 100M
FREQUENCY (Hz)
Figure 23. Small Signal Frequency Response for Various Capacitive Loads
0
VOCM = 1V
VOCM = 2.5V
VOCM = 4V
–10
–20
–30
–40
10k
100k
1M 10M
FREQUENCY (Hz)
100M
Figure 24. Small Signal Frequency Response for Various VOCM Levels
5
VOUT = 100mV p-p
VOCM = 2.5V
0
–5
–10
–15
–2
1k
10k 100k 1M
FREQUENCY (Hz)
10M
Figure 25. VOCM Small Signal Frequency Response
AD8475
0
–7.96
–10
CL = 0pF
CL = 5pF
CL = 10pF
–20
–30
1k
10k 100k 1M 10M 100M
FREQUENCY (Hz)
Figure 26. Large Signal Frequency Response for Various Capacitive Loads
0
VOCM = 1.5V
VOCM = 2.5V
VOCM = 3.5V
–10
–20
–30
1k
10k 100k 1M 10M 100M
FREQUENCY (Hz)
Figure 27. Large Signal Frequency Response for Various VOCM Levels
10
VOUT = 2V p-p
VOCM = 2.5V
0
–10
–20
–30
–40
1k
10k 100k 1M 10M
FREQUENCY (Hz)
Figure 28. VOCM Large Signal Frequency Response
Rev. C | Page 11 of 24
11 Page | ||
| Páginas | Total 24 Páginas | |
| PDF Descargar | [ Datasheet AD8475.PDF ] | |
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