Datasheet ADA4945-1 (Analog Devices)
| Manufacturer | Analog Devices |
| Description | High-Speed, ±0.3µV/°C Offset Drift, Fully Differential ADC Driver |
| Pages / Page | 18 / 1 — High Speed, ±0.3 µV/˚C Offset Drift,. Ful y Differential ADC Driver. … |
| Revision | PrC |
| File Format / Size | PDF / 468 Kb |
| Document Language | English |
High Speed, ±0.3 µV/˚C Offset Drift,. Ful y Differential ADC Driver. Preliminary Technical Data. ADA4945-1. FEATURES
Model Line for this Datasheet
Text Version of Document
High Speed, ±0.3 µV/˚C Offset Drift, Ful y Differential ADC Driver Preliminary Technical Data ADA4945-1 FEATURES FUNCTIONAL BLOCK DIAGRAM Fully specified dual power mode operation 500Ω 500Ω + 33Ω 4 mA full power mode (200 MHz) +IN –OUT 110pF 1.4 mA low power mode (80 MHz) VOCM ADA4945-1 AD7768 +OUT Full power mode –IN 33Ω – Low harmonic distortion 500Ω 500Ω
006
−140 dB THD at 1 kHz –DIN
16932-
−120 dB THD at 100 kHz
Figure 1.
Fast settling time
The low dc offset, dc offset drift, and excel ent dynamic
18-bit: 100 ns
performance of the ADA4945-1 makes it well suited for a
16-bit: 50 ns
variety of data acquisition and signal processing applications.
Input voltage noise: 1.6 nV/√Hz, f = 100 kHz
The ADA4945-1 is available in a RoHS-complaint, 3 mm × 3 mm,
±50 µV maximum offset voltage from −40°C to +125°C
16-lead LFCSP. The ADA4945-1 is specified to operate over the
Rail-to-rail output
−40°C to +125°C temperature range.
Wide input common-mode voltage range: −VS to +VS − 1.3 V 0 Flexible power supplies: 3 V to 10 V APPLICATIONS –20 Low power Σ-Δ, PulSAR®/SAR ADC drivers –40 Single-ended to differential conversion –60 B) Differential buffers d ( –80 Medical imaging UDE Industrial process controls IT –100 L P Portable electronics AM –120 GENERAL DESCRIPTION –140
The ADA4945-1 is a low noise, low distortion, fully differential
–160
amplifier with a selectable power mode. It is an ideal choice for
–180
driving high resolution, high performance SAR and Σ-Δ analog-
0 25k 50k 75k 100k
002 to-digital converters (ADCs) on 4 mA of quiescent current
FREQUENCY (Hz)
16932- Figure 2. ADA4945-1 with Single-Ended Input, in Full Power Mode Driving (full power mode) and can be selected to operate on 1.4 mA of the AD7768 ADC with −0.5 dBFS, 20 kHz Input Tone quiescent current (low power mode) to scale the power
Table 1. Recommended Converters
consumption to the desired operation performance necessary
Power Throughput Resolution SNR
for the ADC drive application. The adjustable level of the
Product (mW) (MSPS) (Bits) (dB)
output common-mode voltage al ows the ADA4945-1 to match AD4001 16 2 16 96 the input common-mode voltage of multiple ADCs. The AD4003 16 2 18 100 internal common-mode feedback loop provides exceptional AD4005 8 1 16 96 output balance, as well as suppression of even order harmonic AD4007 8 1 18 100 distortion products. AD4011 4 0.5 18 100 AD4020 20 2 20 100 With the ADA4945-1, differential gain configurations are AD7768 52 0.256 24 108 realized with a simple external feedback network of four AD7960 47 5 18 99 resistors determining the closed-loop gain of the amplifier. The ADA4945-1 is fabricated using Analog Devices, Inc., proprietary, silicon germanium (SiGe), complementary bipolar process, enabling the device to achieve low levels of distortion with an input voltage noise of only 1.6 nV/√Hz (ful power mode).
Rev. PrA Document Feedback Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Specifications subject to change without notice. No One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Tel: 781.329.4700 ©2018 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. Technical Support www.analog.com
Document Outline Features Applications General Description Functional Block Diagram Table of Contents Specifications Supply Voltage (VS) = 10 V Positive Input (+DIN) or Negative Input (–DIN) to Differential Output Voltage (VOUT, dm) Performance VOCM to VOUT, cm Performance General Performance VS = 5 V +DIN or –DIN to VOUT, dm Performance VOCM to VOUT, cm Performance General Performance VS = 3 V +DIN or –DIN to VOUT, dm Performance VOCM to VOUT, cm Performance General Performance Absolute Maximum Ratings Thermal Resistance Maximum Power Dissipation ESD Caution Pin Configuration and Function Descriptions Terminology Outline Dimensions
006
−140 dB THD at 1 kHz –DIN
16932-
−120 dB THD at 100 kHz
Figure 1.
Fast settling time
The low dc offset, dc offset drift, and excel ent dynamic
18-bit: 100 ns
performance of the ADA4945-1 makes it well suited for a
16-bit: 50 ns
variety of data acquisition and signal processing applications.
Input voltage noise: 1.6 nV/√Hz, f = 100 kHz
The ADA4945-1 is available in a RoHS-complaint, 3 mm × 3 mm,
±50 µV maximum offset voltage from −40°C to +125°C
16-lead LFCSP. The ADA4945-1 is specified to operate over the
Rail-to-rail output
−40°C to +125°C temperature range.
Wide input common-mode voltage range: −VS to +VS − 1.3 V 0 Flexible power supplies: 3 V to 10 V APPLICATIONS –20 Low power Σ-Δ, PulSAR®/SAR ADC drivers –40 Single-ended to differential conversion –60 B) Differential buffers d ( –80 Medical imaging UDE Industrial process controls IT –100 L P Portable electronics AM –120 GENERAL DESCRIPTION –140
The ADA4945-1 is a low noise, low distortion, fully differential
–160
amplifier with a selectable power mode. It is an ideal choice for
–180
driving high resolution, high performance SAR and Σ-Δ analog-
0 25k 50k 75k 100k
002 to-digital converters (ADCs) on 4 mA of quiescent current
FREQUENCY (Hz)
16932- Figure 2. ADA4945-1 with Single-Ended Input, in Full Power Mode Driving (full power mode) and can be selected to operate on 1.4 mA of the AD7768 ADC with −0.5 dBFS, 20 kHz Input Tone quiescent current (low power mode) to scale the power
Table 1. Recommended Converters
consumption to the desired operation performance necessary
Power Throughput Resolution SNR
for the ADC drive application. The adjustable level of the
Product (mW) (MSPS) (Bits) (dB)
output common-mode voltage al ows the ADA4945-1 to match AD4001 16 2 16 96 the input common-mode voltage of multiple ADCs. The AD4003 16 2 18 100 internal common-mode feedback loop provides exceptional AD4005 8 1 16 96 output balance, as well as suppression of even order harmonic AD4007 8 1 18 100 distortion products. AD4011 4 0.5 18 100 AD4020 20 2 20 100 With the ADA4945-1, differential gain configurations are AD7768 52 0.256 24 108 realized with a simple external feedback network of four AD7960 47 5 18 99 resistors determining the closed-loop gain of the amplifier. The ADA4945-1 is fabricated using Analog Devices, Inc., proprietary, silicon germanium (SiGe), complementary bipolar process, enabling the device to achieve low levels of distortion with an input voltage noise of only 1.6 nV/√Hz (ful power mode).
Rev. PrA Document Feedback Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Specifications subject to change without notice. No One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Tel: 781.329.4700 ©2018 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. Technical Support www.analog.com
Document Outline Features Applications General Description Functional Block Diagram Table of Contents Specifications Supply Voltage (VS) = 10 V Positive Input (+DIN) or Negative Input (–DIN) to Differential Output Voltage (VOUT, dm) Performance VOCM to VOUT, cm Performance General Performance VS = 5 V +DIN or –DIN to VOUT, dm Performance VOCM to VOUT, cm Performance General Performance VS = 3 V +DIN or –DIN to VOUT, dm Performance VOCM to VOUT, cm Performance General Performance Absolute Maximum Ratings Thermal Resistance Maximum Power Dissipation ESD Caution Pin Configuration and Function Descriptions Terminology Outline Dimensions
