Datasheet

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Dual High Speed,

Low Noise Op Amp

Data Sheet

AD8022

Rev. C

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FEATURES

Low power amplifiers provide low noise and low distortion,

ideal for xDSL modem receiver

Wide supply range: +5 V, ±2.5 V to ±12 V voltage supply

Low power consumption: 4.0 mA/Amp

Voltage feedback

Ease of Use

Lower total noise (insignificant input current noise

contribution compared to current feedback amps)

Low noise and distortion

2.5 nV/√Hz voltage noise @ 100 kHz

1.2 pA/√Hz current noise

MTPR < −66 dBc (G = +7)

SFDR 110 dB @ 200 kHz

High speed

130 MHz bandwidth (−3 dB), G = +1

Settling time to 0.1%, 68 ns

50 V/μs slew rate

High output swing: ±10.1 V on ±12 V supply

Low offset voltage, 1.5 mV typical

APPLICATIONS

Receiver for ADSL, VDSL, HDSL, and proprietary

xDSL systems

Low noise instrumentation front end

Ultrasound preamps

Active filters

16-bit ADC buffers

FUNCTIONAL BLOCK DIAGRAM

AD8022

UT1

–IN1

+IN1

–V

OUT2

–IN2

+IN2

01053-001

–

Figure 1.

GENERAL DESCRIPTIONS

The AD8022 consists of two low noise, high speed, voltage

feedback amplifiers. Each amplifier consumes only 4.0 mA of

quiescent current, yet has only 2.5 nV/√Hz of voltage noise.

These dual amplifiers provide wideband, low distortion

performance, with high output current optimized for stability

when driving capacitive loads. Manufactured on ADI’s high

voltage generation of XFCB bipolar process, the AD8022

operates on a wide range of supply voltages. The AD8022 is

available in both an 8-lead MSOP and an 8-lead SOIC. Fast over

voltage recovery and wide bandwidth make the AD8022 ideal as

the receive channel front end to an ADSL, VDSL, or proprietary

xDSL transceiver design.

In an xDSL line interface circuit, the AD8022’s op amps can be

configured as the differential receiver from the line transformer

or as independent active filters.

FREQUENCY (Hz)

(pA/ Hz, nV/ Hz)

100

10 10M1M100k10k1k100

01053-002

(pA/ Hz)

(nV/ Hz)

Figure 2. Current and Voltage Noise vs. Frequency

Summary of content (17 pages)

PAGE 1
Dual High Speed, Low Noise Op Amp AD8022 Data Sheet FUNCTIONAL BLOCK DIAGRAM Low power amplifiers provide low noise and low distortion, ideal for xDSL modem receiver Wide supply range: +5 V, ±2.5 V to ±12 V voltage supply Low power consumption: 4.0 mA/Amp Voltage feedback Ease of Use Lower total noise (insignificant input current noise contribution compared to current feedback amps) Low noise and distortion 2.5 nV/√Hz voltage noise @ 100 kHz 1.
PAGE 2
Powered by TCPDF (www.tcpdf.org) IMPORTANT LINKS for the AD8022* Last content update 08/18/2013 07:23 pm PARAMETRIC SELECTION TABLES DESIGN TOOLS, MODELS, DRIVERS & SOFTWARE Find Similar Products By Operating Parameters High Speed Amplifiers Selection Table dBm/dBu/dBv Calculator Analog Filter Wizard 2.
PAGE 3
AD8022 Data Sheet TABLE OF CONTENTS Specifications..................................................................................... 3 DMT Modulation and Multitone Power Ratio (MTPR)....... 13 Absolute Maximum Ratings............................................................ 5 Channel Capacity and SNR....................................................... 13 Maximum Power Dissipation ..................................................... 5 Power Supply and Decoupling..............................
PAGE 4
Data Sheet AD8022 SPECIFICATIONS At 25°C, VS = ±12 V, RL = 500 Ω, G = +1, TMIN = –40°C, TMAX = +85°C, unless otherwise noted. Table 1. Parameter DYNAMIC PERFORMANCE −3 dB Small Signal Bandwidth Bandwidth for 0.1 dB Flatness Large Signal Bandwidth 1 Slew Rate Rise and Fall Time Settling Time 0.
PAGE 5
AD8022 Data Sheet At 25°C, VS = ±2.5 V, RL = 500 Ω, G = +1, TMIN = –40°C, TMAX = +85°C, unless otherwise noted. Table 2. Parameter DYNAMIC PERFORMANCE −3 dB Small Signal Bandwidth Bandwidth for 0.1 dB Flatness Large Signal Bandwidth 1 Slew Rate Rise and Fall Time Settling Time 0.
PAGE 6
Data Sheet AD8022 ABSOLUTE MAXIMUM RATINGS Table 3. Parameter Supply Voltage (+VS to −VS) Internal Power Dissipation 1 8-Lead SOIC (R) 8-Lead MSOP (RM) Input Voltage (Common Mode) Differential Input Voltage Output Short-Circuit Duration Storage Temperature Range Operating Temperature Range (A Grade) Lead Temperature Range (Soldering 10 sec) 1 Rating 26.4 V 1.6 W 1.2 W ±VS ±0.
PAGE 7
AD8022 Data Sheet TYPICAL PERFORMANCE CHARACTERISTICS 5 5 RF 402Ω 4 VIN 2 3 RF = 715Ω 50Ω (dB) RF = 402Ω –2 –3 01053-004 10 FREQUENCY (MHz) 100 –4 5 G = +2 RL = 500Ω FREQUENCY RESPONCE (dB) 0.1 0 (dB) 10 FREQUENCY (MHz) VIN RS 4 0.2 –0.1 –0.3 ±12V –0.4 ±5.0V ±2.5V –0.5 1M 10M FREQUENCY (Hz) 01053-005 –0.2 100 500 453Ω VOUT 50Ω 3 CL 2 715Ω 56.2Ω 715Ω 50pF 1 0 –1 30pF –2 0pF –3 –4 –5 0.1 100M 1 10 FREQUENCY (kHz) 100 500 Figure 8.
PAGE 8
Data Sheet AD8022 80 100mV 70 60 100ns INPUT 100 90 GAIN (dB) 50 40 30 20 10 10 0 OUTPUT 0% –10 5k 10k 100k 1M 10M FREQUENCY (Hz) 100M 01053-013 01053-010 100mV 500M Figure 10. Open-Loop Gain vs. Frequency Figure 13. Noninverting Small Signal Pulse Response, RL = 500 Ω, VS = ±2.5 V, G = +1, RF = 0 Ω 2.00V 180 100ns INPUT FREQUENCY (Degrees) 100 90 0 10 OUTPUT 01053-011 0% 5k 10k 100k 1M 10M FREQUENCY (Hz) 100M 2.00V 500M Figure 11. Open-Loop Phase vs.
PAGE 9
AD8022 Data Sheet –50 0.3 –60 HARMONIC DISTORTION (dB) 0.4 0 –0.1% –0.1 –0.2 –0.4 0 20 40 60 TIME (ns) 80 100 –90 –100 2ND –130 1k 120 Figure 16. Settling Time to 0.1%, VS = ±12 V, Step Size = 2 V p-p, G = +2, RL = 500 Ω 0.3 –60 HARMONIC DISTORTION (dB) –50 SETTLING ERROR (%) 0.2 0.1 +0.1% 0 –0.1 –0.1% –0.2 20 40 60 TIME (ns) 80 100 10M 2ND –80 3RD –90 –100 –110 –130 1k 120 10k 100k FREQUENCY (Hz) 1M 10M Figure 20. Distortion vs. Frequency, VS = ±2.
PAGE 10
Data Sheet AD8022 0 10dB/DIV (dBc) –40 –60 2ND –80 01053-025 –120 –67.2dBc 3RD –100 01053-022 HARMONIC DISTORTION (dBc) –20 0 0.5 1.0 1.5 2.0 OUTPUT VOLTAGE (V p-p) 2.5 102.4 103.4 104.4 105.4 106.4 107.4 108.4 109.4 110.4 111.4 112.4 FREQUENCY (kHz) 3.0 Figure 22. Distortion vs. Output Voltage, VS = ±2.5 V, G = +1, f = 1 MHz, RL = 500 Ω, RF = 0 Ω Figure 25.
PAGE 11
AD8022 Data Sheet 0 –50 1kΩ SIDE A 50Ω –60 1kΩ SIDE B 56.7Ω SIDE A –1.0 SIDE B CMRR (dB) VS = ±2.5V –1.5 –80 VS = +12V –2.5 –60 –40 –20 0 20 40 60 80 TEMPERATURE (°C) 100 120 –100 1k 140 Figure 28. Voltage Offset vs. Temperature 1M TOTAL SUPPLY CURRENT (mA) 8.0 VS = ±12V 3.0 2.5 VS = ±2.5V 2.0 1.5 1.0 0 –60 –40 –20 0 20 40 60 80 TEMPERATURE (°C) 100 120 7.0 6.5 VS = ±2.5V 6.0 5.5 01053-029 0.5 VS = ±12V 7.5 5.0 –50 140 Figure 29. Bias Current vs.
PAGE 12
AD8022 0 0 –10 –10 –20 –20 –30 –30 CROSSTALK (dB) –PSRR –40 –50 –60 +PSRR –70 –50 –60 SIDE B OUT –70 –80 –90 100k 1M FREQUENCY (Hz) 10M 01053-036 –80 –100 10k SIDE A OUT –40 01053-034 POWER SUPPLY REJECTION (dB) Data Sheet –90 –100 100k 100M Figure 34. Power Supply Rejection vs. Frequency VS = ±2.5 V 1M 10M FREQUENCY (Hz) 100M Figure 36. Output-to-Output Crosstalk vs. Frequency, VS = ±2.
PAGE 13
AD8022 Data Sheet THEORY OF OPERATION The AD8022 is a voltage-feedback op amp designed especially for ADSL or other applications requiring very low voltage and current noise along with low supply current, low distortion, and ease of use. The AD8022 is fabricated on Analog Devices’ proprietary eXtra-Fast Complementary Bipolar (XFCB) process, which enables the construction of PNP and NPN transistors with similar fTs in the 4 GHz region.
PAGE 14
Data Sheet AD8022 APPLICATIONS ADSL systems rely on discrete multitone DMT modulation to carry digital data over phone lines. DMT modulation appears in the frequency domain as power contained in several individual frequency subbands, sometimes referred to as tones or bins, each of which is uniformly separated in frequency. (See Figure 24 to Figure 27 for MTPR results while the AD8022 receives DMT driving 800 mV rms across a 500 Ω differential load.
PAGE 15
2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 Rev. C | Page 14 of 16 Figure 40. DMT Signal Generator Schematic A J4 A J3 C13 22pF OUT2 C12 22pF OUT1 R2 A A 1µF R6 49.9Ω 1µF A A 10kΩ 10kΩ 226Ω 16 15 14 13 12 11 10 9 1 2 3 4 5 6 7 8 AVEE 0.1µF AD8022 750Ω 750Ω AD8022 0.
PAGE 16
Data Sheet AD8022 6800pF 5% NPO +VIN 191Ω 1% LAYOUT CONSIDERATIONS 12V 243Ω 1% 3 8 AD8022 1 2 +VOUT 8200pF 10% COMMONMODE VOLTAGE SIGNAL CM LEVEL 0.1μF 16V 10% X7R 8200pF 10% 422Ω 1% 249Ω 1% 0.1μF 50V 5% NPO 249Ω 1% 6 7 5 191Ω 1% 4 243Ω 1% –VOUT AD8022 6800pF 5% NPO 01053-041 –VIN Figure 41. Differential Input Sallen-Key Filter Using AD8022 on Single Supply, +12 V 7.5 2.5 –2.5 –7.
PAGE 17
AD8022 Data Sheet OUTLINE DIMENSIONS 5.00 (0.1968) 4.80 (0.1890) 8 4.00 (0.1574) 3.80 (0.1497) 5 1 4 1.27 (0.0500) BSC 0.25 (0.0098) 0.10 (0.0040) 6.20 (0.2441) 5.80 (0.2284) 1.75 (0.0688) 1.35 (0.0532) 0.51 (0.0201) 0.31 (0.0122) COPLANARITY 0.10 SEATING PLANE 0.50 (0.0196) 0.25 (0.0099) 45° 8° 0° 0.25 (0.0098) 0.17 (0.0067) 1.27 (0.0500) 0.40 (0.