LM4990_15 datasheet(7/28 Pages) TI

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LM4990

www.ti.com

SNAS184E – DECEMBER 2002 – REVISED MAY 2013

Electrical Characteristics VDD = 2.6V

(1) (2)

The following specifications apply for the circuit shown in Figure 1, unless otherwise specified. Limits apply for TA = 25°C.

LM4990

Units

Symbol

Parameter

Conditions

(Limits)

Typical(3)

Limit(4)(5)

VIN = 0V, Io = 0A, No Load

2.0

IDD

Quiescent Power Supply Current

VIN = 0V, Io = 0A, 8Ω Load

3.0

ISD

Shutdown Current

VSD = VSD Mode

(6)

0.1

µA

VSDIH

Shutdown Voltage Input High

VSD MODE = VDD

1.0

VSDIL

Shutdown Voltage Input Low

VSD MODE = VDD

0.9

VSDIH

Shutdown Voltage Input High

VSD MODE = GND

1.2

VSDIL

Shutdown Voltage Input Low

VSD MODE = GND

1.0

VOS

Output Offset Voltage

mV (max)

ROUT

9.7

Ω (max)

Resistor Output to GND(7)

8.5

7.0

Ω (min)

( 8

Ω )

THD+N = 1% (max); f = 1kHz

300

Output Power

( 4

Ω )

THD+N = 1% (max); f = 1kHz

400

TWU

Wake-up time

THD+N

Total Harmonic Distortion+Noise

Po = 0.15Wrms; f = 1kHz

0.1

Vripple = 200mV sine p-p

51 (f = 217Hz)

PSRR

Power Supply Rejection Ratio

Input terminated with 10

Ω

51 (f = 1kHz)

(1)

Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for

which the device is intended to be functional but specific performance is not ensured. Electrical Characteristics state DC and AC

electrical specifications under particular test conditions which ensure specific performance limits. This assumes that the device is within

the Operating Ratings. Specifications are not ensured for parameters where no limit is given, however, the typical value is a good

indication of device performance.

(2)

All voltages are measured with respect to the ground pin, unless otherwise specified.

(3)

Typicals are measured at 25°C and represent the parametric norm.

(4)

Limits are specified to AOQL (Average Outgoing Quality Level).

(5)

Datasheet min/max specification limits are specified by design, test, or statistical analysis.

(6)

For DSBGA only, shutdown current is measured in a Normal Room Environment. Exposure to direct sunlight will increase ISD by a

maximum of 2µA.

(7)

RROUT is measured from the output pin to ground. This value represents the parallel combination of the 10kΩ output resistors and the

two 20k

Ω resistors.

External Components Description

See (Figure 5)

Components

Functional Description

Inverting input resistance which sets the closed-loop gain in conjunction with Rf. This resistor also forms a high pass

filter with Ci at fC= 1/(2π RiCi).

Input coupling capacitor which blocks the DC voltage at the amplifiers input terminals. Also creates a highpass filter with

Ri at fc = 1/(2π RiCi). Refer to the section, PROPER SELECTION OF EXTERNAL COMPONENTS, for an explanation

of how to determine the value of Ci.

Feedback resistance which sets the closed-loop gain in conjunction with Ri.

Supply bypass capacitor which provides power supply filtering. Refer to the POWER SUPPLY BYPASSING section for

information concerning proper placement and selection of the supply bypass capacitor.

Bypass pin capacitor which provides half-supply filtering. Refer to the section, PROPER SELECTION OF EXTERNAL

COMPONENTS, for information concerning proper placement and selection of CB.

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