ANALOG DEVICES ADA4858-3 Service Manual

Single-Supply, High Speed,

FEATURES

Integrated charge pump

Supply range: 3 V to 5.5 V Output range: −3.3 V to −1.8 V 50 mA maximum output current for external use at −3 V

High speed amplifiers

−3 dB bandwidth: 600 MHz Slew rate: 600 V/μs

0.1 dB flatness: 85 MHz

0.1% settling time: 18 ns

Low power

Total quiescent current: 42 mA Power-down feature

High input common-mode voltage range

−1.8 V to +3.8 V at +5 V supply Current feedback architecture Differential gain error: 0.01% Differential phase error: 0.02° Available in 16-lead LFCSP

APPLICATIONS

Professional video Consumer video Imaging Active filters

Triple Op Amp with Charge Pump

ADA4858-3

CONNECTION DIAGRAM

ADA4858-3

OUT1

–IN1

+IN1

16 15 14 13

+V

1

S

2C1_a

CHARGE

PUMP

3

C1_b

CPO

4

5678

S

+V

NOTES

1. NC = NO CONNECT .

2. EXPOSED PAD, CONNECT TO GROUND.

Figure 1.

NC

12

+IN2

–IN2

11

10 OUT2

PD

9

–IN3

+IN3

OUT3

7714-001

GENERAL DESCRIPTION

The ADA4858-3 (triple) is a single-supply, high speed current feedback amplifier with an integrated charge pump that eliminates the need for negative supplies to output negative voltages or output a 0 V level for video applications. The 600 MHz, −3 dB bandwidth and 600 V/μs slew rate make this amplifier well suited for many high speed applications. In addition, its 0.1 dB flatness out to 85 MHz at G = 2, along with its differential gain and phase errors of 0.01% and 0.02° into a 150 Ω load, make it well suited for professional and consumer video applications.

Rev. A

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.

This triple operational amplifier is designed to operate on supply voltages of 3.3 V to 5 V, using only 42 mA of total quiescent current, including the charge pump. To further reduce the power consumption, it is equipped with a powerdown feature that lowers the total supply current to as low as

2.5 mA when the amplifier is not being used. Even in powerdown mode, the charge pump can be used to power external components. The maximum output current for external use is 50 mA at −3 V. The amplifier also has a wide input commonmode voltage range that extends from 1.8 V below ground to

1.2 V below the positive rail at a 5 V supply.

The ADA4858-3 is available in a 16-lead LFCSP, and it is designed to work over the extended industrial temperature range of

−40°C to +105°C.

ADA4858-3

REVISION HISTORY

5/09—Rev. 0 to Rev. A

Changes to Overview Section and Charge Pump Operation

Section .............................................................................................. 13

Changes to Table 5 and Figure 41 ................................................. 14

Added DC Restore Function Section, Figure 43, Clamp

Amplifier Section, and Figure 44 .................................................. 15

10/08—Revision 0: Initial Version

Rev. A | Page 2 of 20

ADA4858-3

SPECIFICATIONS

TA = 25°C, VS = 5 V, G = 2, RF = 301 Ω, RF = 402 Ω for G = 1, RL = 150 Ω, unless otherwise noted.

Table 1.

Parameter Conditions Min Typ Max Unit

DYNAMIC PERFORMANCE

−3 dB Bandwidth V

V V V Bandwidth for 0.1 dB Flatness V Slew Rate V Settling Time to 0.1% V

NOISE/DISTORTION PERFORMANCE

Harmonic Distortion (HD2/HD3) fC = 1 MHz, V f Crosstalk f = 5 MHz −60 dB Input Voltage Noise f = 1 MHz 4 nV/√Hz Input Current Noise f = 1 MHz (+IN/−IN) 2/9 pA/√Hz Differential Gain Error 0.01 % Differential Phase Error 0.02 Degrees

DC PERFORMANCE

Input Offset Voltage −14 +0.5 +14 mV + Input Bias Current −2 +0.7 +2 μA

− Input Bias Current −13 +8 +13 μA

Open-Loop Transimpedance 300 390 kΩ

INPUT CHARACTERISTICS

Input Resistance +IN1/+IN2 15 MΩ

−IN1/−IN2 90 Ω

Input Capacitance +IN1/+IN2 1.5 pF Input Common-Mode Voltage Range Typical −1.8 +3.8 V Common-Mode Rejection Ratio −61 −54 dB

OUTPUT CHARACTERISTICS

Output Voltage Swing −1.4 to +3.6 −1.7 to +3.7 V Output Overdrive Recovery Time Rise/fall, f = 5 MHz 15 ns Maximum Linear Output Current @ V

OUT

= 1 V

fC = 1 MHz, HD2 ≤ −50 dBc 21 mA

PEAK

POWER-DOWN

Input Voltage Enabled 1.9 V Powered down 2 V Bias Current −0.1 +0.1 μA Turn-On Time 0.3 μs Turn-Off Time 1.6 μs

POWER SUPPLY

Operating Range 3 5.5 V Total Quiescent Current

Amplifiers 15 19 21 mA Charge Pump 23 mA

Total Quiescent Current When Powered Down

Amplifiers 0.15 0.25 0.3 mA

Charge Pump 4 mA Positive Power Supply Rejection Ratio −64 −60 dB Negative Power Supply Rejection Ratio −58 −54 dB Charge Pump Output Voltage −3.3 −3 −2.5 V Charge Pump Sink Current 150 mA

= 0.1 V p-p, G = 1 600 MHz

OUT

= 0.1 V p-p 350 MHz

OUT

= 2 V p-p, G = 1 165 MHz

OUT

= 2 V p-p 175 MHz

OUT

= 2 V p-p 85 MHz

OUT

= 2 V step 600 V/μs

OUT

= 2 V step 18 ns

OUT

= 2 V p-p −86/−94 dBc

OUT

= 5 MHz, V

C

Rev. A | Page 3 of 20

= 2 V p-p −71/−84 dBc

OUT

ADA4858-3

TA = 25°C, VS = 3.3 V, G = 2, RF = 301 Ω, RF = 402 Ω for G = 1, RL = 150 Ω, unless otherwise noted.

Table 2.

Parameter Conditions Min Typ Max Unit

DYNAMIC PERFORMANCE

−3 dB Bandwidth V V V V Bandwidth for 0.1 dB Flatness V Slew Rate V Settling Time to 0.1% V

NOISE/DISTORTION PERFORMANCE

Harmonic Distortion (HD2/HD3) fC = 1 MHz, V f Crosstalk f = 5 MHz −60 dB Input Voltage Noise f = 1 MHz 4 nV/√Hz Input Current Noise f = 1 MHz (+IN/−IN) 2/9 pA/√Hz Differential Gain Error 0.02 % Differential Phase Error 0.03 Degrees

DC PERFORMANCE

Input Offset Voltage −14 +0.7 +14 mV + Input Bias Current −2 +0.6 +2 μA

− Input Bias Current −13 +7 +13 μA Open-Loop Transimpedance 300 350 kΩ

INPUT CHARACTERISTICS

Input Resistance +IN1/+IN2 15 MΩ

−IN1/−IN2 90 Ω Input Capacitance +IN1/+IN2 1.5 pF Input Common-Mode Voltage Range Typical −0.9 +2.2 V Common-Mode Rejection Ratio −60 −54 dB

OUTPUT CHARACTERISTICS

Output Voltage Swing −0.6 to +2.1 −0.9 to +2.2 V Output Overdrive Recovery Time Rise/fall, f = 5 MHz 15 ns Maximum Linear Output Current @ V

OUT

= 1 V

fC = 1 MHz, HD2 ≤ −50 dBc 20 mA

PEAK

POWER-DOWN

Input Voltage Enabled 1.25 V Powered down 1.35 V Bias Current −0.1 +0.1 μA Turn-On Time 0.3 μs Turn-Off Time 1.6 μs

POWER SUPPLY

Operating Range 3 5.5 V Total Quiescent Current

Amplifiers 14 19 20 mA Charge Pump 21 mA

Total Quiescent Current When Powered Down

Amplifiers 0.15 0.25 0.3 mA

Charge Pump 2 mA Positive Power Supply Rejection Ratio −63 −60 dB Negative Power Supply Rejection Ratio −57 −54 dB Charge Pump Output Voltage −2.1 −2 −1.8 V Charge Pump Sink Current 45 mA

= 0.1 V p-p, G = 1 540 MHz

OUT

= 0.1 V p-p 340 MHz

OUT

= 2 V p-p, G = 1 140 MHz

OUT

= 2 V p-p 145 MHz

OUT

= 2 V p-p 70 MHz

OUT

= 2 V step 430 V/μs

OUT

= 2 V step 20 ns

OUT

= 2 V p-p −88/−91 dBc

OUT

= 5 MHz, V

C

Rev. A | Page 4 of 20

= 2 V p-p −75/−78 dBc

OUT

ADA4858-3

ABSOLUTE MAXIMUM RATINGS

Table 3.

Parameter Rating

Supply Voltage 6 V

Internal Power Dissipation1

16-Lead LFCSP See Figure 2 Input Voltage (Common Mode) (−VS − 0.2 V) to (+VS − 1.2 V) Differential Input Voltage ±VS Output Short-Circuit Duration Observe power derating curves Storage Temperature Range −65°C to +125°C Operating Temperature Range −40°C to +105°C Lead Temperature

300°C

(Soldering, 10 sec)

1

Specification is for device in free air.

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.

MAXIMUM POWER DISSIPATION

The maximum power that can be safely dissipated by the ADA4858-3 is limited by the associated rise in junction temperature. The maximum safe junction temperature for plastic encapsulated devices is determined by the glass transition temperature of the plastic, approximately 150°C. Temporarily exceeding this limit may cause a shift in parametric performance due to a change in the stresses exerted on the die by the package. Exceeding a junction temperature of 175°C for an extended period can result in device failure.

To ensure proper operation, it is necessary to observe the maximum power derating curves in Figure 2.

2.5

2.0

1.5

1.0

0.5

MAXIMUM POWER DISSIPATION (W)

0

–40 –20 0 20 40 60 80 100

Figure 2. Maximum Power Dissipation vs. Ambient Temperature

AMBIENT TEMP ERATURE (°C)

07714-002

ESD CAUTION

Rev. A | Page 5 of 20

ADA4858-3

A

PIN CONFIGURATION AND FUNCTION DESCRIPTIONS

DA4858-3

TOP VIEW

(Not to Scale)

OUT1

–IN1

+IN1

16 15 14 13

1

+V

S

2C1_a

CHARGE

PUMP

3

C1_b

CPO

4

5678

S

+V

NOTES

1. NC = NO CONNECT .

2. EXPOSED PAD, CONNECT TO GROUND.

Figure 3. Pin Configuration.

Table 4. Pin Function Descriptions

Pin No. Mnemonic Description

1 +VS Positive Supply for Charge Pump. 2 C1_a Charge Pump Capacitor Side a. 3 C1_b Charge Pump Capacitor Side b. 4 CPO Charge Pump Output. 5 +VS Positive Supply. 6 +IN3 Noninverting Input 3. 7 −IN3 Inverting Input 3. 8 OUT3 Output 3. 9 PD Power-Down. 10 OUT2 Output 2. 11 −IN2 Inverting Input 2. 12 +IN2 Noninverting Input 2. 13 NC No Connect. 14 +IN1 Noninverting Input 1. 15 −IN1 Inverting Input 1. 16 OUT1 Output 1. EPAD Exposed Pad (EPAD) The exposed pad must be connected to ground.

NC

12

+IN2

–IN2

11

10 OUT2

PD

9

–IN3

+IN3

OUT3

07714-003

Rev. A | Page 6 of 20

ANALOG DEVICES ADA4858-3 Service Manual

FEATURES

APPLICATIONS

CONNECTION DIAGRAM

GENERAL DESCRIPTION

TABLE OF CONTENTS

REVISION HISTORY

SPECIFICATIONS

ABSOLUTE MAXIMUM RATINGS

MAXIMUM POWER DISSIPATION

ESD CAUTION

PIN CONFIGURATION AND FUNCTION DESCRIPTIONS