ADA4950-1YCP-EBZ Analog Devices Inc, ADA4950-1YCP-EBZ Datasheet
ADA4950-1YCP-EBZ
Specifications of ADA4950-1YCP-EBZ
Related parts for ADA4950-1YCP-EBZ
ADA4950-1YCP-EBZ Summary of contents
Page 1
... Figure 3. Harmonic Distortion vs. Frequency at Various Supplies The ADA4950-x is available in a Pb-free × 3 mm, 16-lead LFCSP (ADA4950-1, single Pb-free × 4 mm, 24-lead LFCSP (ADA4950-2, dual). The pinout has been optimized to facilitate PCB layout and minimize distortion. The ADA4950-1/ ADA4950-2 are specified to operate over the −40°C to +105°C temperature range ...
Page 2
... ADA4950-1/ADA4950-2 TABLE OF CONTENTS Features .............................................................................................. 1 Applications ....................................................................................... 1 General Description ......................................................................... 1 Functional Block Diagrams ............................................................. 1 Revision History ............................................................................... 2 Specifications ..................................................................................... 3 ±5 V Operation ............................................................................. Operation ............................................................................... 5 Absolute Maximum Ratings ............................................................ 7 Thermal Resistance ...................................................................... 7 Maximum Power Dissipation ..................................................... 7 ESD Caution .................................................................................. 7 Pin Configurations and Function Descriptions ........................... 8 Typical Performance Characteristics ............................................. 9 Test Circuits ..................................................................................... 16 Terminology .................................................................................... 17 REVISION HISTORY 5/09—Revision 0: Initial Version ...
Page 3
... Slew Rate Settling Time to 0.1% Overdrive Recovery Time NOISE/HARMONIC PERFORMANCE Second Harmonic Third Harmonic IMD3 Voltage Noise (Referred to Output) Crosstalk (ADA4950-2) INPUT CHARACTERISTICS Offset Voltage (Referred to Input) Input Capacitance Input Common-Mode Voltage Range CMRR Open-Loop Gain OUTPUT CHARACTERISTICS Output Voltage Swing ...
Page 4
... ADA4950-1/ADA4950 Performance OCM OUT, cm Table 2. Parameter V DYNAMIC PERFORMANCE OCM −3 dB Small-Signal Bandwidth −3 dB Large-Signal Bandwidth Slew Rate Input Voltage Noise (Referred to Input) V INPUT CHARACTERISTICS OCM Input Voltage Range Input Resistance Input Offset Voltage V CMRR OCM Gain General Performance Table 3. Parameter POWER SUPPLY ...
Page 5
... Slew Rate Settling Time to 0.1% Overdrive Recovery Time NOISE/HARMONIC PERFORMANCE Second Harmonic Third Harmonic IMD3 Voltage Noise (Referred to Input) Crosstalk (ADA4950-2) INPUT CHARACTERISTICS Offset Voltage (Referred to Input) Input Capacitance Input Common-Mode Voltage Range CMRR Open-Loop Gain OUTPUT CHARACTERISTICS Output Voltage Swing ...
Page 6
... ADA4950-1/ADA4950 Performance OCM OUT, cm Table 5. Parameter V DYNAMIC PERFORMANCE OCM −3 dB Small-Signal Bandwidth −3 dB Large-Signal Bandwidth Slew Rate Input Voltage Noise (Referred to Input) V INPUT CHARACTERISTICS OCM Input Voltage Range Input Resistance Input Offset Voltage V CMRR OCM Gain General Performance Table 6. Parameter POWER SUPPLY ...
Page 7
... ADA4950-1, 16-Lead LFCSP (Exposed Pad) ADA4950-2, 24-Lead LFCSP (Exposed Pad) MAXIMUM POWER DISSIPATION The maximum safe power dissipation in the ADA4950-x package is limited by the associated rise in junction temperature (T the die. At approximately 150°C, which is the glass transition temperature, the plastic changes its properties. Even temporarily ...
Page 8
... POWER PLANE. Figure 5. ADA4950-1 Pin Configuration Table 9. ADA4950-1 Pin Function Descriptions Pin No. Mnemonic 1 +INB 2 +INA 3 −INA 4 −INB OCM 10 +OUT 11 −OUT − (EPAD) Exposed Paddle (EPAD) Table 10. ADA4950-2 Pin Function Descriptions Pin No. Mnemonic 1 −INA1 2 −INB1 +INB2 6 +INA2 7 −INA2 8 −INB2 OCM2 12 +OUT2 13 −OUT2 14 PD2 15, 16 − ...
Page 9
... Figure 9. Small-Signal Frequency Response for Various Temperatures = 53.6 Ω (when used 1000 1000 Figure 11. Large-Signal Frequency Response for Various Supplies 1000 Figure 12. Large-Signal Frequency Response for Various Temperatures Rev Page ADA4950-1/ADA4950 kΩ, unless otherwise noted. Refer to Figure p-p 1 OUT 53.6Ω ...
Page 10
... ADA4950-1/ADA4950 100mV p-p OUT – 1kΩ 200Ω –2 L –3 –4 –5 –6 –7 – 100 FREQUENCY (MHz) Figure 13. Small-Signal Frequency Response at Various Loads 100mV p-p 1 OUT – –2.5VDC OCM –2 OCM V = +2.5VDC OCM –3 –4 –5 –6 –7 – 100 FREQUENCY (MHz) Figure 14 ...
Page 11
... Figure 24. Harmonic Distortion vs. Frequency at Various Gains Rev Page ADA4950-1/ADA4950-2 0 p-p OUT, dm 0.4 0.3 0.2 0.1 0 ADA4950- 1kΩ L ADA4950- 200Ω L ADA4950-2, AMP 1kΩ L ADA4950-2, AMP 200Ω L ADA4950-2, AMP 1kΩ L ADA4950-2, AMP 200Ω 100 FREQUENCY (MHz (AC p-p OCM ...
Page 12
... ADA4950-1/ADA4950-2 – p-p OUT, dm –50 –60 HD2, ±5V HD3, ±5V –70 HD2, ±2.5V HD3, ±2.5V –80 –90 –100 –110 –120 –130 –140 0.1 1 FREQUENCY (MHz) Figure 25. Harmonic Distortion vs. Frequency at Various Supplies – p-p OUT, dm –40 –50 HD2 AT 10MHz –60 HD3 AT 10MHz HD2 AT 30MHz – ...
Page 13
... 100mV p-p IN, dm PSRR+ PSRR– 10 100 FREQUENCY (MHz) Figure 35. PSRR vs. Frequency R = 200Ω p-p IN, dm AMPLIFIER 2 TO AMPLIFIER 1 AMPLIFIER 1 TO AMPLIFIER 2 10 100 FREQUENCY (MHz) Figure 36. Crosstalk vs. Frequency, ADA4950 –45 –90 –135 –180 –225 –270 10G 1000 1000 ...
Page 14
... ADA4950-1/ADA4950-2 0 INPUT SINGLE-ENDED, 50Ω LOAD TERMINATION OUTPUT DIFFERENTIAL, 100Ω SOURCE TERMINATION S11: SINGLE-ENDED-TO-SINGLE-ENDED –10 S22: DIFFERENTIAL-TO-DIFFERENTIAL R = 200Ω 100mV p-p –20 IN, dm –30 S11 –40 S22 –50 – FREQUENCY (MHz) Figure 37. Return Loss ( vs. Frequency 11 22 1000 100 100 1k 10k FREQUENCY (Hz) Figure 38 ...
Page 15
... Figure 46. Large-Signal Pulse Response for Various Capacitive Loads 1.5 1.0 0.5 0 –0.5 –1.0 –1 0.5 V 0.4 5 0.3 4 0.2 0 –0.1 –0.2 1 –0.3 0 –0.4 –0.5 – Rev Page ADA4950-1/ADA4950 0pF 0.9pF 1.8pF 2.7pF TIME (ns TIME (ns) Figure 47. V Large-Signal Pulse Response OCM = +1V DC OCM PD PIN INPUT (SHOWN INVERTED FOR CLARITY ...
Page 16
... NC –5V Figure 50. Test Circuit for Output Balance, CMRR +5V 250Ω 500Ω NC 500Ω 53.6Ω V ADA4950-x OCM 500Ω 0.1µF 250Ω 500Ω NC –5V Figure 51. Test Circuit for Distortion Measurements Rev Page +5V 1kΩ ...
Page 17
... Any imbalances in amplitude or phase produce an undesired common-mode signal at the amplifier output. Output balance error is defined as the magnitude of the output common-mode voltage divided by the magnitude of the output differential mode voltage. Output Rev Page ADA4950-1/ADA4950 )/2 +OUT −OUT Δ V ...
Page 18
... The ADA4950-x behaves much like a standard voltage feedback op amp and facilitates single-ended-to-differential conversions, common-mode level shifting, and amplifications of differential signals. Like an op amp, the ADA4950-x has high input impedance at its internal input terminals (to the right of the internal gain resistors) and low output impedance. Because it uses voltage feedback, the ADA4950-x manifests a nominally constant gain bandwidth product ...
Page 19
... G R 500 G ESTIMATING THE OUTPUT NOISE VOLTAGE The differential output noise of the ADA4950-x can be estimated using the noise model in Figure 53. The values of R can OCM the selected gain. The input-referred noise voltage density modeled as a differential input, and the noise currents appear between each input and ground ...
Page 20
... R (Ω IN, se 500 53.6 667 250 57.6 375 250||500 61.9 267 Figure 54. ADA4950-x Configured for Balanced (Differential) Inputs / For an unbalanced, single-ended input signal (see Figure 55 the input impedance the root-sum- nOD The input impedance of the circuit is effectively higher than it ...
Page 21
... Terminating a Single-Ended Input This section describes how to properly terminate a single-ended input to the ADA4950-x with a gain 500 Ω. An example using an input source with a terminated output voltage p-p and source resistance of 50 Ω illustrates the steps that must be followed. Note that because the terminated output voltage of the source p-p, the open-circuit output voltage of the source p-p ...
Page 22
... In most linear applications, the summing node voltages do not approach levels that result in the forward-biasing of the internal ESD protection diodes on the amplifier inputs. Signals at the inputs of the ADA4950-x are applied to the input side of the gain resistors, and, if caution is not exercised, these signals can be large enough to forward-bias the ESD protection diodes ...
Page 23
... LAYOUT, GROUNDING, AND BYPASSING As a high speed device, the ADA4950-x is sensitive to the PCB environment in which it operates. Realizing its superior performance requires attention to the details of high speed PCB design. The first requirement is a solid ground plane that covers as much of the board area around the ADA4950-x as possible. The thermal resistance, θ ...
Page 24
... UNIPOLAR SIGNAL 0V SOURCE 0.1µF Figure 63. ADA4950-1 Driving an AD9245 ADC with Unipolar DC-Coupled Input and Output, Gain = 2 Because the inputs are dc-coupled, dc common-mode current flows in the feedback loops, and a nominal dc level of 0. AD9245 ADC, present at the amplifier input terminals. A fraction of the output signal is also present at the input terminals as a common-mode signal ...
Page 25
... ADA4950-1YCPZ-RL −40°C to +105°C 1 ADA4950-1YCPZ-R7 −40°C to +105°C 1 ADA4950-2YCPZ-R2 −40°C to +105°C 1 ADA4950-2YCPZ-RL −40°C to +105°C 1 ADA4950-2YCPZ-R7 −40°C to +105° RoHS Compliant Part. 3.00 0.60 MAX BSC SQ 0. (BOTTOM VIEW) 2.75 TOP BSC SQ ...
Page 26
... ADA4950-1/ADA4950-2 NOTES Rev Page ...
Page 27
... NOTES Rev Page ADA4950-1/ADA4950-2 ...
Page 28
... ADA4950-1/ADA4950-2 NOTES ©2009 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. D07957-0-5/09(0) Rev Page ...