LM4937

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SNAS369J – OCTOBER 2006 – REVISED MAY 2013

(1)(2) (continued)

The following specifications apply for the circuit shown in Figure 1 with all programmable gain set at 0dB, unless otherwise

Symbol

Parameter

Conditions

LM4937

Units

(Limits)

Speaker; THD = 1%; f = 1kHz, 8

Ω BTL

420

370

mW (min)

Output Power

Headphone; THD = 1%; f = 1kHz, 32

Ω SE

27

24

mW (min)

Earpiece; THD = 1%; f = 1kHz, 32

Ω BTL

45

40

mW (min)

Full Scale DAC Output

2.4

Vpp

0.04

%

f = 1kHz, 8

Ω BTL

THD+N

Total Harmonic Distortion

0.01

%

f = 1kHz, 32

Ω SE

0.04

%

f = 1kHz, 32

Ω BTL

Speaker

10

55

mV (max)

Offset Voltage

Earpiece

8

50

mV (max)

Headphone (OCL)

8

40

mV (max)

Output Noise

A = weighted; 0dB gain;

Table 1

See Table 1

PSRR

Power Supply Rejection Ratio

Table 2

Xtalk

Crosstalk

–60

dB

f = 1kHz; OCL

Wake-Up Time

35

ms (max)

85

ms (max)

CMRR

Common-Mode Rejection Ratio

56

dB

(1) (2)

The following specifications apply for the circuit shown in Figure 1 with all programmable gain set at 0dB, unless otherwise

Symbol

Parameter

Conditions

LM4937

Units

(Limits)

17.5

mA (max)

Headphone Mode Only (OCL)

5.8

mA (max)

Supply Current

11.6

mA (max)

5

mA (max)

12.9

mA (max)

Shutdown Current

1.6

μA (max)

Speaker; THD = 1%;

1.25

mW (min)

f = 1kHz, 8

Ω BTL

Headphone; THD = 1%;

Output Power

80

mW (min)

f = 1kHz, 32

Ω SE

Earpiece; THD = 1%;

175

mW (min)

f = 1kHz, 32

Ω BTL

(1)

All voltages are measured with respect to the GND 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)

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

(5)

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

(6)

Enabling mono bit (D_6 in Output Control Register 01h) will save 400

μA (typ) from specified current.

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