Fairchild Semiconductor KM4470 Datasheet

Features at 2.7V

• 136µA supply current per amplifier

• 4.9MHz bandwidth

• Output swings to within 20mV of either rail

• Input voltage range exceeds the rail by >250mV

• 5.3V/µs slew rate

• 16mA output current

• 21nV/√Hz input voltage noise

• KM4170: directly replaces OPA340, OPA343, and TLV2461 in single supply applications and available in SC70-5 and SOT23-5 package options

• KM4270: directly replaces MAX4126, OPA2340, LMV822 and TLV2462 in single supply applications and available in SOIC-8 and MSOP-8 package options

• KM4470: directly replaces MAX4129, OPA4340, LMV824 and TLV2464 in single supply applications and available in TSSOP-14 package option

Applications

• Portable/battery-powered applications

• PCMCIA, USB

• Mobile communications, cellular phones, pagers

•Notebooks and PDA’s

• Sensor Interface

• A/D buffer

• Active filters

• Signal conditioning

• Portable test instruments

Description

The KM4170 (single), KM4270 (dual), and KM4470 (quad) are ultra-low cost, low power, voltage feedback amplifiers. At 5V, the KM4X70 family uses only 160µAof supply current per amplifier and are designed to operate from a supply range of 2.5V to 5.5V (±1.25 to ±2.75). The input voltage range exceeds the negative and positive rails.

The KM4X70 family of amplifiers offer high bipolar performance at a low CMOS prices. They offer superior dynamic performance with 4.9MHz small signal bandwidths and 5.3V/µs slew rates. The combination of low power, high bandwidth, and rail-to-rail performance make the KM4X70 amplifiers well suited for battery-powered communication/ computing systems.

KM4170, KM4270, KM4470

Low Cost, +2.7V & +5V, Rail-to-Rail I/O Amplifiers

www.fairchildsemi.com

REV. 5 December 2002

Large Signal Frequency Response

Vs = 5V

Vo = 1V

pp

Vo = 4V

pp

Magnitude (1dB/div)

0.01

Frequency (MHz)

Output Swing vs. Load

1.35

0.1

RL = 10kΩ

RL = 1kΩ

Vo = 2V

pp

1

10

RL = 75Ω

0

Output Voltage (0.27V/div)

-1.35

RL = 100Ω

RL = 200Ω

-2.0

Input Voltage (0.4V/div)

RL = 75/100Ω

0

2.0

DATA SHEET KM4170, KM4270, KM4470

2 REV. 5 December 2002

KM4170

-

+

1

2

3

Out

-V

s

+In

+V

s

-In

5

4

SC70-5

KM4270

MSOP

-

+

-

+

1

2

3

4

Out1

-In1

+In1

-V

s

+V

s

Out2

-In2

+In2

8

7

6

5

SOIC

KM4470

1

2

3

4

Out1

-In1

+In1

+V

s

14

13

12

11

5

6

+In2

-In2

10

9

TSSOP

SOT23-5

Out

-V

+In

Out1

-In1

+In1

-V

+V

1

2

s

+

3

1

2

-

+

3

4

s

5

-

4

8

7

6

-

+

5

s

-In

+V

s

Out2

-In2

+In2

KM4170, KM4270, KM4470 DATA SHEET

REV. 5 December 2002 3

Absolute Maximum Ratings

Parameter Min. Max. Unit

Supply Voltages 0+6V Maximum Junction Temperature – +175 °C Storage Temperature Range -65 +150 °C Lead Temperature, 10 seconds – +260 °C Operating Temperature Range, recommended -40 +85 °C Input Voltage Range -

Vs-0.5 +Vs+0.5

V

I

out

Continuous -30 +30 mA

Electrical Specifications

(Vs= +2.7V, G = 2, RL= 10kΩ to Vs/2, Rf= 5kΩ; unless otherwise noted)

Parameter Conditions Min. Typ. Max. Unit AC Performance

-3dB Bandwidth

1

G = +1, Vo= 0.02V

pp

4.9 MHz

G = +2, Vo= 0.2V

pp

3.7 MHz

Full Power Bandwidth G = +2, Vo= 2V

pp

1.4 MHz Gain Bandwidth Product 2.2 MHz Rise and Fall Time 1V step 163 ns Overshoot 1V step <1 % Slew Rate 1V step 5.3 V/µs 2nd Harmonic Distortion 1Vpp, 10kHz -72 dBc 3rd Harmonic Distortion 1Vpp, 10kHz -72 dBc THD 1Vpp, 10kHz 0.03 % Input Voltage Noise >10kHz 21 nV/√Hz

DC Performance

Input Offset Voltage

2

-6 0.5 +6 mV

Average Drift 5 µV/°C Input Bias Current

2

90 420 nA Average Drift 32 pA/°C Power Supply Rejection Ratio

2

DC 55 83 dB Open Loop Gain RL= 10kΩ 90 dB Quiescent Current Per Channel

2

136 190 µA

Input Characteristics

Input Resistance 12 MΩ Input Capacitance 2 pF Input Common Mode Voltage Range -0.25 to 2.95 V Common Mode Rejection Ratio

2

DC, Vcm= 0V to V

s

55 81 dB

Output Characteristics

Output Voltage Swing

2

RL= 10kΩ to Vs/2 0.06 to 2.64 0.02 to 2.68 V

RL= 1kΩ to Vs/2 0.05 to 2.63 V

RL= 200Ω to Vs/2 0.11 to 2.52 V Output Current ±16 mA Power Supply Operating Range 2.5 2.7 5.5 V

Min/max ratings are based on product characterization and simulation. Individual parameters are tested as noted. Outgoing quality levels are determined from tested parameters.

Notes:

1. For G = +1, Rf= 0.

2. For RL= 10kΩ, KM4170, KM4270, and KM4470 are 100% tested at 25°C.

DATA SHEET KM4170, KM4270, KM4470

4 REV. 5 December 2002

Electrical Specifications

(Vs= +5V, G = 2, RL= 10kΩ to Vs/2, Rf= 5kΩ; unless otherwise noted)

Parameter Conditions Min. Typ. Max. Unit AC Performance

-3dB Bandwidth

1

G = +1, Vo= 0.02V

pp

4.3 MHz

G = +2, Vo= 0.2V

pp

3.0 MHz

Full Power Bandwidth G = +2, Vo= 2V

pp

2.3 MHz Gain Bandwidth Product 2.0 MHz Rise and Fall Time 1V step 110 ns Overshoot 1V step <1 % Slew Rate 1V step 9 V/µs 2nd Harmonic Distortion 1Vpp, 10kHz -73 dBc 3rd Harmonic Distortion 1Vpp, 10kHz -75 dBc THD 1Vpp, 10kHz 0.03 % Input Voltage Noise >10kHz 22 nV/√Hz

DC Performance

Input Offset Voltage

2

-8 1.5 +8 mV

Average Drift 15 µV/°C Input Bias Current

2

90 450 nA Average Drift 40 pA/°C Power Supply Rejection Ratio

2

DC 40 60 dB Open Loop Gain RL= 10kΩ 80 dB Quiescent Current Per Channel

2

160 235 µA

Input Characteristics

Input Resistance 12 MΩ Input Capacitance 2 pF Input Common Mode Voltage Range -0.25 to 5.25 V Common Mode Rejection Ratio

2

DC, Vcm= 0V to V

s

58 85 dB

Output Characteristics

Output Voltage Swing

2

RL= 10kΩ to Vs/2 0.08 to 4.92 0.04 to 4.96 V

RL= 1kΩ to Vs/2 0.07 to 4.9 V

RL= 200Ω to Vs/2 0.14 to 4.67 V Output Current ±30 mA Power Supply Operating Range 2.5 2.7 5.5 V

Min/max ratings are based on product characterization and simulation. Individual parameters are tested as noted. Outgoing quality levels are determined from tested parameters.

Notes:

1. For G = +1, Rf= 0.

2. For RL= 10kΩ, KM4170 is 100% tested at 25°C.

Package Thermal Resistance

Package θ

JA

5 lead SOT23 256°C/W 5 lead SC70 331.4°C/W 8 lead SOIC 152°C/W 8 lead MSOP 206°C/W 14 lead TSSOP 100°C/W

KM4170, KM4270, KM4470 DATA SHEET

REV. 5 December 2002 5

Typical Operating Characteristics

(Vs= +2.7V, G = 2, RL= 10kΩ to Vs/2, Rf= 5kΩ; unless otherwise noted)

Non-Inverting Freq. Response Vs = +5V

Vo = 0.2V

pp

G = 10

Rf = 5kΩ

R

G = 2

= 5kΩ

f

G = 5

G = 1

Rf = 0

Normalized Magnitude (1dB/div)

0.01

0.1

1

Frequency (MHz)

Non-Inverting Frequency Response

Vo = 0.2V

pp

G = 10

Rf = 5kΩ

G = 2

Rf = 5kΩ

G = 5

G = 1

Rf = 0

Normalized Magnitude (1dB/div)

0.01

0.1

1

Frequency (MHz)

Inverting Frequency Response Vs = +5V

Vo = 0.2V

pp

G = -2

R

= 5kΩ

G = -10

Rf = 5kΩ

f

G = -5

R

G = -1

= 5kΩ

f

Normalized Magnitude (1dB/div)

10

0.01

0.1

1

10

Frequency (MHz)

Inverting Frequency Response

Rf = 5kΩ

G = -2

G = -10

G = -5

G = -1

Normalized Magnitude (1dB/div)

10

0.01

0.1

1

10

Frequency (MHz)

Frequency Response vs. C

Vo = 0.05V

+

Magnitude (1dB/div)

-

5kΩ

0.01

CL = 100pF

= 100Ω

R

s

CL = 20pF

R

s

C

R

L

5kΩ

L

0.1

= 0

s

CL = 10pF

R

s

L

= 0

1

Frequency (MHz)

Large Signal Frequency Response

Vs = 5V

Vo = 4V

pp

Magnitude (1dB/div)

0.01

0.1

Vo = 2V

pp

1

Frequency (MHz)

CL = 50pF

= 0Ω

R

s

Vo = 1V

Frequency Response vs. R

RL = 1kΩ

RL = 200Ω

Magnitude (1dB/div)

10

0.01

RL = 50Ω

0.1

1

L

RL = 10kΩ

10

Frequency (MHz)

Open Loop Gain & Phase vs. Frequency

140

|Gain|

RL = 10kΩ

pp

120

100

|Gain| No load

Vs = 5V

Open Loop Phase (deg)

80

8

0

-45

-90

-135

-180

60

40

20

Open Loop Gain (dB)

0

Phase

RL = 10kΩ

Phase No load

-20

10

10010110210310410510610710

Frequency (Hz)