LM4937

SNAS369J – OCTOBER 2006 – REVISED MAY 2013

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(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)

Full Scale DAC Output

2.4

Vpp

0.03

%

f = 1kHz, 8

Ω BTL

THD+N

Total Harmonic Distortion

0.01

%

f = 1kHz, 32

Ω SE

0.04

%

f = 1kHz, 32

Ω BTL; CD4 = 0

Speaker

10

mV

Offset Voltage

Earpiece

8

mV

HP (OCL)

8

mV

Output Noise

A = weighted; 0dB gain;

Table 1

See Table 1

PSRR

Power Supply Rejection Ratio

Table 3

Xtalk

Crosstalk

–56

dB

f = 1kHz; OCL

45

ms

Wake-Up Time

130

ms

VOLUME CONTROL ELECTRICAL CHARACTERISTICS

(1) (2)

The following specifications apply for 3.0V

Symbol

Parameter

Conditions

LM4937

Units

(Limits)

–7

dB (min)

minimum gain setting

–6

–5

dB (max)

Stereo Analog Inputs PreAmp Gain

Setting Range

15.5

dB (max)

maximum gain setting

15

14.5

dB (min)

PGR

–13

dB (min)

minimum gain setting

–12

–11

dB (max)

Differential Mono Analog Input

PreAmp Gain Setting Range

9.5

dB (max)

maximum gain setting

9

8.5

dB (min)

–59

dB (min)

minimum gain setting

–56

Output Volume Control for

–53

dB (max)

VCR

Loudspeaker, Headphone Output, or

4.5

dB (min)

Earpiece Output

maximum gain setting

+5

5.5

dB (max)

Stereo Channel to Channel Gain

0.3

dB

Mismatch

Mute Attenuation

with load

Headphone

<-90

dB (min)

(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

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