AD85052 データシートの表示（PDF） - Analog Devices

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AD85052

Operational Amplifiers Selection Guide

Analog Devices 

Precision Amplifiers (VOS < 1 mV, Bandwidth < 50 MHz)

Zero Input Crossover Distortion (ZCO) Amplifiers

ADA4505-2: 10 µA, Rail-to-Rail I/O, Zero Input Crossover Distortion Amplifier

The ADA4505-x family solves the crossover distortion problem by using an on-chip charge pump to power the input differential pair. The charge pump

creates a supply voltage higher than the voltage of the battery, allowing the input stage to handle a wide range of input signal voltages without using a

second differential pair. With this solution, the input voltage can vary from one supply extreme to the other with no distortion, thereby restoring the full

common-mode dynamic range of the op amp.

Features

• PSRR: 100 dB minimum

• CMRR: 105 dB typical

• Very low supply current: 10 mA per amplifier maximum

• 1.8 V to 5.5 V single-supply or 60.9 V to 62.5 V

dual-supply operation

• Rail-to-rail input/output

• 3 mV offset voltage maximum

• Very low input bias current: 0.5 pA typical

Applications

• Pressure and position sensors

• Remote security

• Medical monitors

• Battery-powered consumer equipment

• Hazard detectors

140

120

TYPICAL

100

AMPLIFIER

80

60

ZCO

40

AMPLIFIER

20

0

0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0

VCM (V)

Input offset voltage vs. common mode voltage.

+5V

10k

RED

TIMING

+5V

53.6k

0.1 F

+1.25V

ADR1581 +5V

10k

IR

TIMING

+5V

10k

ENABLE

+5V

VDD

+5V

0.1 F

S1A

D1

22

S1B

1/2

ADA4505-2

IN1

22pF

1k

ADG1636

S2A

D2

22

S2B

1/2

ADA4505-2

IN2

22pF

EN VSS GND

1k

CONNECT TO

RED LED CIRCUIT

10.3mA

IRLMS2002

121 ±0.1%

CONNECT TO

INFRARED LED CIRCUIT

15.2mA

IRLMS2002

82.5 ±0.1%

Circuit Note CN-0125, Precision Pulse Oximeter LED Current Sink Reference Circuit, www.analog.com/CN0125.

Zero Input Crossover Distortion (ZCO) Amplifiers

Process

Part

Number

No. of

Amps

Supply

Voltage

(Min/Max)

Rail-to-Rail1

BW @ Slew

ACL Min Rate

(MHz) (V/ms)

VOS Max

(mV)

TcVOS

(mv/°C Typ)

CMRR

Min

(dB)

PSRR

Min

(dB)

AVO

Min

(dB)

Noise

(nV/√Hz)

@ 1 kHz

IS/Amp

(mA Max)

IB Max

(pA)

ADA4505-12 1

CMOS ADA4505-2 2

ADA4505-4 4

1.8/5.5

RRIO

0.050 0.006

3

2

90 100 105 65

0.010 2

CMOS

AD85052

AD8506

AD8508

1

2 1.8/5.5

4

RRIO

0.095 0.013 2.5

2

90 100 105 45

0.020 10

1 RRIO: rail-to-rail input/output, RRO: rail-to-rail output, SS: single supply (IVR includes –VSY).

2 Check data sheet for test conditions and actual product specification—may be different for single/dual/quad amplifiers for part numbers with 2 mark.

Packaging

WLCSP/SOT-23

WLCSP/MSOP

WLCSP/TSSOP

WLCSP/SOT-23

Price

@ 1k

(OEM $US)

0.55

0.67

1.15

0.59

0.71

1.20

16 | Operational Amplifier Selection Guide

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