LM48 datasheet(5/24 Pages) TI1

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LM4808

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SNAS051D – FEBRUARY 2000 – REVISED MAY 2013

ELECTRICAL CHARACTERISTICS

(1) (2) (continued)

The following specifications apply for VDD = 3.3V unless otherwise specified, limits apply to TA = 25°C.

Symbol

Parameter

Conditions

Units

(Limits)

Typ (3)

Limit (4)

THD+N = 0.1%, f = 1 kHz

RL = 16Ω

RL = 32Ω

Output Power

THD+N = 10%, f = 1 kHz

RL = 16Ω

RL = 32Ω

ELECTRICAL CHARACTERISTICS

(1) (2)

The following specifications apply for VDD = 2.6V unless otherwise specified, limits apply to TA = 25°C.

Symbol

Parameter

Conditions

Units

(Limits)

Typ (3)

Limit (4)

IDD

Supply Current

VIN = 0V, IO = 0A

0.9

mA (max)

VOS

Input Offset Voltage

VIN = 0V

mV (max)

THD+N = 0.1%, f = 1 kHz

RL = 16Ω

RL = 32Ω

Output Power

THD+N = 10%, f = 1 kHz

RL = 16Ω

RL = 32Ω

(1)

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

(2)

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

which the device is functional, but do not ensure specific performance limits. 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.

(3)

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

(4)

Tested limits are specified to AOQL (Average Outgoing Quality Level). Datasheet min/max specification limits are specified by design,

test, or statistical analysis.

EXTERNAL COMPONENTS DESCRIPTION

(Figure 1)

Components Functional Description

The inverting input resistance, along with Rf, set the closed-loop gain. Ri, along with Ci, form a high pass filter with fc =

1. Ri

1/(2

πRiCi).

The input coupling capacitor blocks DC voltage at the amplifier's input terminals. Ci, along with Ri, create a highpass filter

2. Ci

with fC = 1/(2πRiCi). Refer to the section, SELECTING PROPER EXTERNAL COMPONENTS, for an explanation of

determining the value of Ci.

3. Rf

The feedback resistance, along with Ri, set closed-loop gain.

This is the supply bypass capacitor. It provides power supply filtering. Refer to the APPLICATION INFORMATION section

4. CS

for proper placement and selection of the supply bypass capacitor.

This is the half-supply bypass pin capacitor. It provides half-supply filtering. Refer to the section, SELECTING PROPER

5. CB

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

This is the output coupling capacitor. It blocks the DC voltage at the amplifier's output and forms a high pass filter with RL at

6. CO

fO = 1/(2πRLCO)

7. RB

This is the resistor which forms a voltage divider that provides 1/2 VDD to the non-inverting input of the amplifier.

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