ANALOG DEVICES ADA4895-2 Service Manual

1 nV/√Hz, Low Power,G≥10 Stable

Preliminary Data Sheet

FEATURES

Low wideband noise

1 nV/√Hz

2.8 pA/√Hz

Low 1/f noise

2.4 nV/√Hz @ 10 Hz Low distortion: −115 dBc @ 100 kHz, V Low power: 3 mA/amp Low input offset voltage: 0.5 mV maximum High speed

230 MHz, −3 dB bandwidth (G = +10) 500 V/μs slew rate

TBD ns settling time to 0.1% Rail-to-rail output Wide supply range: 3 V to 10 V Disable feature

APPLICATIONS

Low noise preamplifier Ultrasound amplifiers PLL loop filters High performance ADC drivers DAC buffers

GENERAL DESCRIPTION

The ADA4895-2 is gain 10 stable, low noise, rail-to-rail output, high speed voltage feedback amplifier having a quiescent current of 3 mA. With the 1/f noise of 2.4 nV/√Hz at 10 Hz and a spurious-free dynamic range of −63 dBc at 2 MHz, the

ADA4895-2 is an ideal solution in a variety of applications,

including ultrasound, low noise preamplifiers, and drivers of high performance ADCs. The Analog Devices, Inc., proprietary next generation SiGe bipolar process and innovative architecture enable such high performance amplifiers.

The ADA4895-2 has 1500 MHz Gain bandwidth product, 500 V/μs slew rate, and settle to 0.1% in TBD ns. With a wide supply voltage range (3 V to 10 V), the ADA4895-2 is ideal candidates for systems that require high dynamic range, high gain, precision, and high speed.

The ADA4895-2 is available in 10-lead MSOP package and itoperates over the extended industrial temperature range of

−40°C to +125°C.

= 2 V p-p

OUT

Rail-to-Rail Output Amplifier

ADA4895-2

FUNCTIONAL BLOCK DIAGRAM

Figure 1. 10-Lead MSOP (ADA4895-2)

8

VS = ±5V

7

6

5

4

3

VOLTAGE NOISE (nV/√Hz)

2

1

0

1 10 100 1k 10k 100k 1M 5M

FREQUENCY (Hz)

Figure 2. Voltage Noise vs. Frequency

Table 1. Other Low Noise Amplifiers

(nV/√Hz)

V

N

Part Number

AD797 0.9 0.9 8 10 to 30 AD8021 5 2.1 490 5 to 24 AD8099 7 0.95 510 5 to 12 AD8045 6 3 1000 3.3 to 12 ADA4897-1 1 1 230 3 to 10 ADA4896-2 1 1 230 3 to 10 ADA4899-1 1.4 1 600 5 to 12 ADA4898-1/

ADA4898-2

@ 1 kHz

0.9 0.9 65 10 to 32

VN (nV/√Hz) @ 100 kHz

BW (MHz)

Table 2. Complementary ADCs

Part Number Bits Speed (MSPS) Power (mW)

AD7944 14 2.5 15.5 AD7985 16 2.5 15.5 AD7986 18 2 15

09447-102

Supply Voltage (V)

Rev. PrB

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 license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarks and registered trademarks are the property of their respective owners.

ADA4895-2 Preliminary Data Sheet

TABLE OF CONTENTS

Features .............................................................................................. 1

Applications ....................................................................................... 1 

General Description ......................................................................... 1

Functional Block Diagram .............................................................. 1

Revision History ............................................................................... 2

Specifications ..................................................................................... 3

±5 V Supply ....................................................................................3

+5 V Supply ....................................................................................5

+3 V Supply ....................................................................................7

Pin Configurations and Function Descriptions ............................9

Typical Performance Characteristics ........................................... 10

Outline Dimensions ....................................................................... 12

Rev. PrB | Page 2 of 12

Preliminary Data Sheet ADA4895-2

SPECIFICATIONS

±5 V SUPPLY

TA = 25°C, G = +10, RL = 1 kΩ to ground, unless otherwise noted.

Table 3.

Parameter Conditions Min Typ Max Unit

DYNAMIC PERFORMANCE

–3 dB Bandwidth G = +10, V G = +10, V G = +20, V Bandwidth for 0.1 dB Flatness G = +10, V Slew Rate G = +10, V Settling Time to 0.1% G = +10, V Settling Time to 0.01% G = +10, V

NOISE/HARMONIC PERFORMANCE

Harmonic Distortion (dBc) SFDR fC = 100 kHz, V f f f

= 1 MHz, V

C

= 2 MHz, V

C

= 5 MHz, V

C

Input Voltage Noise f = 10 Hz 2.4 nV/√Hz f = 100 kHz 1 nV/√Hz Input Current Noise f = 10 Hz 24 pA/√Hz f = 100 kHz 2.94 pA/√Hz

0.1 Hz to 10 Hz Noise G = +101, RF = 1 kΩ, RG = 10 Ω 99 nV p-p

DC PERFORMANCE

Input Offset Voltage −500 −28 +500 μV Input Offset Voltage Drift 0.2 μV/°C Input Bias Current

−17 −11 −4 μA Input Bias Current Drift 3 nA/°C Input Bias Offset Current −0.6 −0.02 +0.6 μA Open-Loop Gain V

= −4 V to +4 V 100 110 dB

OUT

INPUT CHARACTERISTICS

Input Resistance Common mode/differential 10 M/10 k Ω Input Capacitance Common mode/differential 3/11 pF Input Common-Mode Voltage Range −4.9 to +4.1 V Common-Mode Rejection VCM = −2 V to +2 V −92 −120 dB

OUTPUT CHARACTERISTICS

Output Overdrive Recovery Time VIN = ±5 V, G = +2 81 ns +Output Voltage Swing RL = 1 kΩ 4.85 4.96 V

−Output Voltage Swing RL = 1 kΩ −4.85 −4.97 V +Output Voltage Swing RL = 100 Ω 4.5 4.73 V

−Output Voltage Swing RL = 100 Ω −4.5 −4.84 V Output Current 45 dBc SFDR 80 mA Short-Circuit Current Sinking/sourcing 135 mA Capacitive Load Drive 30% overshoot, G = +2 39 pF

POWER SUPPLY

Operating Range 3 to 10 V Quiescent Current per Amplifier 2.8 3 3.2 mA

DISABLE Positive Power Supply Rejection +VS = 4 V to 6 V, −VS = −5 V −96 −125 dB Negative Power Supply Rejection +VS = 5 V, −VS = −4 V to −6 V −96 −121 dB

= 0.2 V p-p 233 MHz

OUT

= 2 V p-p 140 MHz

OUT

= 0.2 V p-p TBD MHz

OUT

= 2 V p-p, RL = 100 Ω 10 MHz

OUT

= 6 V step 500 V/μs

OUT

= 2 V step TBD ns

OUT

= 2 V step TBD ns

OUT

= 2 V p-p −88 dBc

OUT

= 2 V p-p −68 dBc

OUT

= 2 V p-p −63 dBc

OUT

= 2 V p-p −55 dBc

OUT

= −5 V

0.25 mA

Rev. PrB | Page 3 of 12

ADA4895-2 Preliminary Data Sheet

Parameter Conditions Min Typ Max Unit

DISABLE PIN

DISABLE Voltage Disabled <+VS – 2 V Input Current

Enabled Disabled

Switching Speed

Enabled 0.25 μs Disabled 12 μs

Enabled >+V

DISABLE DISABLE

= +5 V = −5 V

−2.5 μA

−80 μA

− 0.5 V

S

Rev. PrB | Page 4 of 12

Preliminary Data Sheet ADA4895-2

+5 V SUPPLY

TA = 25°C, G = +10, RL = 1 kΩ to midsupply, unless otherwise noted.

Table 4.

Parameter Conditions Min Typ Max Unit

DYNAMIC PERFORMANCE

−3 dB Bandwidth G = +10, V G = +10, V G = +20, V Bandwidth for 0.1 dB Flatness G = +10, V Slew Rate G = +10, V Settling Time to 0.1% G = +10, V Settling Time to 0.01% G = +10, V

NOISE/HARMONIC PERFORMANCE

Harmonic Distortion (dBc) SFDR fC = 100 kHz, V f f f

= 1 MHz, V

C

= 2 MHz, V

C

= 5 MHz, V

C

Input Voltage Noise f = 10 Hz 2.4 nV/√Hz f = 100 kHz 1 nV/√Hz Input Current Noise f = 10 Hz 24 pA/√Hz f = 100 kHz 2.94 pA/√Hz

0.1 Hz to 10 Hz Noise G = +101, RF = 1 kΩ, RG = 10 Ω 99 nV p-p

DC PERFORMANCE

Input Offset Voltage −500 −30 +500 μV Input Offset Voltage Drift 0.2 μV/°C Input Bias Current −17 −11 −4 μA Input Bias Current Drift 3 nA/°C Input Bias Offset Current −0.6 −0.02 +0.6 μA Open-Loop Gain V

= 0.5 V to 4.5 V 97 110 dB

OUT

INPUT CHARACTERISTICS

Input Resistance Common mode/differential 10 M/10 k Ω Input Capacitance Common mode/differential 3/11 pF Input Common-Mode Voltage Range 0.1 to 4.1 V Common-Mode Rejection VCM = +1 V to +4 V −91 −118 dB

OUTPUT CHARACTERISTICS

Overdrive Recovery Time VIN = 0 V to 5 V, G = +2 96 ns +Output Voltage Swing RL = 1 kΩ 4.85 4.98 V

−Output Voltage Swing RL = 1 kΩ 0.15 0.014 V +Output Voltage Swing RL = 100 Ω 4.8 4.88 V

−Output Voltage Swing RL = 100 Ω 0.2 0.08 Output Current 45 dBc SFDR 70 mA Short-Circuit Current Sinking/sourcing 125 mA Capacitive Load Drive 30% overshoot, G = +2 39 pF

POWER SUPPLY

Operating Range 3 to 10 V Quiescent Current per Amplifier 2.7 2.9 3.1 mA

DISABLE Positive Power Supply Rejection +VS = 4.5 V to 5.5 V, −VS = 0 V −96 −123 dB Negative Power Supply Rejection +VS = 5 V, −VS = −0.5 V to +0.5 V −96 −121 dB

= 0.2 V p-p 203 MHz

OUT

= 2 V p-p 127 MHz

OUT

= 0.2 V p-p TBD MHz

OUT

= 2 V p-p, RL = 100 Ω 9.8 MHz

OUT

= 3 V step 451 V/μs

OUT

= 2 V step TBD ns

OUT

= 2 V step TBD ns

OUT

= 2 V p-p −86 dBc

OUT

= 2 V p-p −66 dBc

OUT

= 2 V p-p −60 dBc

OUT

= 2 V p-p −53 dBc

OUT

= 0 V

0.18

Rev. PrB | Page 5 of 12

ADA4895-2 Preliminary Data Sheet

Parameter Conditions Min Typ Max Unit

DISABLE PIN

DISABLE Voltage Disabled <+VS − 2 V Input Current

Enabled Disabled

Switching Speed

Enabled 0.25 μs Disabled 12 μs

Enabled >+V

DISABLE DISABLE

= +5 V = 0 V

−2.5 μA

−50 μA

− 0.5 V

S

Rev. PrB | Page 6 of 12

Preliminary Data Sheet ADA4895-2

+3 V SUPPLY

TA = 25°C, G = +1, RL = 1 kΩ to midsupply, unless otherwise noted.

Table 5.

Parameter Conditions Min Typ Max Unit

DYNAMIC PERFORMANCE

−3 dB Bandwidth G = +10, V G = +10, V G = +20, V Bandwidth for 0.1 dB Flatness G = +10, V Slew Rate G = +10, V Settling Time to 0.1% G = +10, V Settling Time to 0.01% G = +10, V

NOISE/HARMONIC PERFORMANCE

Harmonic Distortion (dBc) SFDR fC = 100 kHz, V f f f

= 1 MHz, V

C

= 2 MHz, V

C

= 5 MHz, V

C

Input Voltage Noise f = 10 Hz 2.3 nV/√Hz f = 100 kHz 1 nV/√Hz Input Current Noise f = 10 Hz 24 pA/√Hz f = 100 kHz 2.94 pA/√Hz

0.1 Hz to 10 Hz Noise G = +101, RF = 1 kΩ, RG = 10 Ω 99 nV p-p

DC PERFORMANCE

Input Offset Voltage −500 −30 +500 uV Input Offset Voltage Drift 0.2 μV/°C Input Bias Current −17 −11 −4 μA Input Bias Current Drift 3 nA/°C Input Bias Offset Current −0.6 −0.02 +0.6 μA Open-Loop Gain V

= 0.5 V to 2.5 V 95 108 dB

OUT

INPUT CHARACTERISTICS

Input Resistance Common mode/differential 10 M/10 k Ω Input Capacitance Common mode/differential 3/11 pF Input Common-Mode Voltage Range 0.1 to 2.1 V Common-Mode Rejection VCM = +1.1 V to +1.9 V −90 −124 dB

OUTPUT CHARACTERISTICS

Overdrive Recovery Time VIN = 0 V to +3 V, G = +2 83 ns +Output Voltage Swing RL = 1 kΩ 2.85 2.97 V

−Output Voltage Swing RL = 1 kΩ 0.15 0.01 V +Output Voltage Swing RL = 100 Ω 2.8 2.92 V

−Output Voltage Swing RL = 100 Ω 0.2 0.05 V Output Current 45 dBc SFDR 60 mA Short-Circuit Current Sinking/sourcing 120 mA Capacitive Load Drive 30% overshoot, G = +2 39 pF

POWER SUPPLY

Operating Range 3 to 10 V Quiescent Current per Amplifier 2.6 2.8 3 mA

DISABLE Positive Power Supply Rejection +VS = 2.7 V to 3.7 V, −VS = 0 V −96 −121 dB Negative Power Supply Rejection +VS = 3 V, −VS = −0.3 V to 0.7 V −96 −120 dB

= 0.2 V p-p 192 MHz

OUT

= 1 V p-p 124 MHz

OUT

= 0.2 V p-p 9.2 MHz

OUT

= 2 V p-p, RL = 100 Ω TBD MHz

OUT

= 1 V step 450 V/μs

OUT

= 2 V step TBD ns

OUT

= 2 V step TBD ns

OUT

= 2 V p-p, G = +2 −85 dBc

OUT

= 1 V p-p, G = −1 −65 dBc

OUT

= 1 V p-p, G = −1 −59 dBc

OUT

= 1 V p-p, G = −1 −52 dBc

OUT

= 0 V

0.15

Rev. PrB | Page 7 of 12

ADA4895-2 Preliminary Data Sheet

Parameter Conditions Min Typ Max Unit

DISABLE PIN

DISABLE Voltage Disabled <−VS + 2 V Input Current

Enabled Disabled

Switching Speed

Enabled 0.25 μs Disabled 12 μs

Enabled >+V

DISABLE DISABLE

= +3 V = 0 V

−2.5 μA

−40 μA

−0.5 V

S

Rev. PrB | Page 8 of 12

Preliminary Data Sheet ADA4895-2

PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS

Figure 3. 10-Lead ADA4895-2 MSOP (10)

Table 6. ADA4895-2 Pin Function Descriptions

Pin No. Mnemonic Description

1 OUT1 Output 1. 2 −IN1 Inverting Input 1. 3 +IN1 Noninverting Input 1. 4 −VS Negative Supply. 5 6

7 +IN2 Noninverting Input 2. 8 −IN2 Inverting Input 2. 9 OUT2 Output 2. 10 +VS Positive Supply. EPAD Exposed Pad. The exposed pad can be connected to GND or left floating.

DISABLE1 DISABLE2

Disable1. Disable2.

Rev. PrB | Page 9 of 12

ADA4895-2 Preliminary Data Sheet

√

TYPICAL PERFORMANCE CHARACTERISTICS

RL = 1 kΩ,unless otherwise noted.When G = +10, RF = 249 Ω.

Figure 4. Small Signal Frequency Response vs. Supply Voltage

Figure 5. Harmonic Distortion vs. Frequency for various supplies

8

VS = ±5V

7

6

5

4

Figure 7. Large Signal Frequency Response vs. Supply Voltage

Figure 8. 0.1 dB Bandwidth at Selected RF Value

100

Hz)

10

V

= ±5V

S

3

VOLTAGE NOISE (nV/√Hz)

2

1

0

1

100

10

FREQUENC Y (Hz)

10k 100k 1M

1k

5M

09447-027

Figure 6. Voltage Noise vs. Frequency

CURRENT NOISE (pA/

1

1 10 100

1k 10k 100k 1M 5M

FREQUENCY (Hz)

Figure 9. Current Noise vs. Frequency

09447-060

Rev. PrB | Page 10 of 12

Preliminary Data Sheet ADA4895-2

0

–100

POWER SUP PLY REJECT ION (dB)

–110

–120

–130

–10

–20

–30

–40

–50

–60

–70

–80

–90

VS = +5V ΔV

= 2V p-p

S

G = +1

–PSRR

+PSRR

1M 10M

FREQUENCY ( Hz)

Figure 12. PSRR vs. Frequency

100M100k10k1k

09447-030

4

OUT

V

IN

3

2

1

0

–1

–2

INPUT AND OUTPUT VOLTAGE (V)

–3

–4

V

TIME = 100n s/DIV

= +5V

V

S

G = +1

09447-049

Figure 10. Input Overdrive Recovery

Figure 11.Small Signal Transient Response for Various Supplies

Figure 13. Large Signal Transient Response for Various Gains

Rev. PrB | Page 11 of 12

OUTLINE DIMENSIONS

3.10

3.00

2.90

10

6

3.10

3.00

2.90

PIN 1

IDENTIFIER

0.95

0.85

0.75

0.15

0.05

COPLANARITY

1

0.50 BSC

0.10

COMPLIANT TO JEDEC STANDARDS MO-187-BA

5.15

4.90

4.65

5

1.10 MAX

0.30

0.15

6° 0°

Figure 14. 10-Lead Mini Small Outline Package [MSOP]

(RM-10)

Dimensions shown in millimeters

15° MAX

0.23

0.13

0.70

0.55

0.40

teehSataD yranimilerP 2-5984ADA

091709-A

registered trademarks are the property of their respective owners.

PR10186-0-9/11(PrB)

Rev. PrB | Page 12 of 12

ANALOG DEVICES ADA4895-2 Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual