TPA2054D4A

IN+

IN–

OUT+

OUT–

V

DD

V

DD

GND

C

I

C

I

Measurement

Output

+

+

–

–

Load

30 kHz

Low-Pass

Filter

Measurement

Input

+

–

1 F

m

TPA2054D4A

www.ti.com

SLOS666 – MAY 2010

OPERATING CHARACTERISTICS (continued)

MODE[2:0] = 001 (single-ended mode)(unless otherwise noted)

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

Threshold

155

°C

Thermal shutdown

Hysteresis

35

°C

Output short-circuit protection

2.4

A

Class-D switching frequency

250

300

350

kHz

Gain matching

Between left and right channels

0.1

dB

HEADPHONE AMPLIFIER

150

mW

(Outputs in Phase)

83

THD = 10 %, HP_VOUT[2:0] = 111

0.14

Maximum headphone output voltage

THD = 10 %, HP_VOUT[2:0] = 100

0.23

Offset Voltage

–3.5

0.5

3.5

mV

Output impedance in shutdown

225

M

Ω

SNR

Signal-to-noise ratio

90

dB

Noise output voltage

12

0.02

%

THD+N

0.01

%

-89

dB

AC-Power supply rejection ratio

-83

dB

Output short-circuit protection

200

mA

Charge pump switching frequency

300

kHz

Gain matching

Between Left and Right channels

0.1

dB

INPUT SECTION

Input impedance (differential)

Volume = 24 dB

16

20.9

k

Ω

Reference voltage

1.65

V

Start-up time from shutdown

8.25

ms

(1)

Per output channel

TEST SET-UP FOR GRAPHS

(1)

(2)

A 33-mH inductor was placed in series with the load resistor to emulate a small speaker for efficiency measurements.

(3)

The 30-kHz low-pass filter is required, even if the analyzer has an internal low-pass filter. An RC low-pass filter (1 k

Ω

4.7 nF) is used on each output for the data sheet graphs.

Copyright © 2010, Texas Instruments Incorporated

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