LM49321 Datasheet, PDF (6/45 Pages) National Semiconductor (TI) – Audio Sub-System with Stereo DAC, Mono Class AB Loudspeaker Amplifier, OCL/SE Stereo Headphone Output and RF Suppression

LM49321, LM49321RLEVAL
SNAS457C – SEPTEMBER 2008 – REVISED MAY 2013
www.ti.com
Audio Amplifier Electrical Characteristics AV_DD = 3.0V, DV_DD = 3.0V⁽¹⁾⁽²⁾
The following specifications apply for the circuit shown in Figure 41 with all programmable gain set at 0dB, unless otherwise
specified. Limits apply for T_A = 25°C.
Parameter
Test Conditions
LM49321
Typ ⁽³⁾
Limits ⁽⁴⁾
Units
(Limits)
V_IN = 0, No Load
All Amps On + DAC, OCL⁽⁵⁾
13
18
mA (max)
Headphone Mode Only, OCL, DAC off
4.6
6.25
mA (max)
Headphone Mode Only, OCL, DAC Off
STEREO_OUTPUT_ONLY = 1,
STEREO_INPUT_ONLY = 1
4
5.5
mA
I_DD
Supply Current
Headphone Mode only OCL, DAC On,
OSR = 64, DAC_INPUT_ONLY = 1
STEREO_OUTPUT_ONLY = 1
7.5
10
mA (max)
Mono Loudspeaker Mode Only
6.5
11.5
mA (max)
Mono Earpiece Speaker Mode Only
I_SD
Shutdown Current
MONO_ONLY = 1 (register 01h)
MONO_ONLY = 0
DAC Off, All Amps On (OCL)⁽⁵⁾
See ⁽⁶⁾
Speaker; THD = 1%; f = 1kHz, 8Ω BTL
3.7
5
mA (max)
3.3
mA
10
13.5
mA (max)
0.6
1
μA (max)
420
370
mW (min)
P_O
Output Power
Headphone; THD = 1%; f = 1kHz, 32Ω SE
27
Earpiece; THD = 1%; f = 1kHz, 32Ω BTL
45
24
mW (min)
40
mW (min)
V_{FS DAC}
Full Scale DAC Output
2.4
Speaker; P_O = 200mW; f = 1kHz, 8Ω BTL
0.04
THD+N
Total Harmonic Distortion+Noise Headphone; P_O = 10mW; f = 1kHz, 32Ω SE
0.01
Earpiece; P_O = 20mW; f = 1kHz, 32Ω BTL
0.04
Speaker
10
V_RMS
%
%
%
55
mV (max)
V_OS
Offset Voltage
Earpiece
Headphone (OCL)
8
50
mV (max)
8
15
mV (max)
∈_O
Output Noise
A-weighted; 0dB gain
Table 1
PSRR
Power Supply Rejection Ratio
f = 217Hz; V_RIPPLE = 200mV_P-P, C_B = 2.2μF
Table 2
X_TALK
Crosstalk
Headphone; P_O = 10mW, f = 1kHz; OCL
–60
dB
T_WU
Wake-Up Time
C_B = 2.2μF, CD_6 = 0
C_B = 2.2μF, CD_6 = 1
35
ms
85
ms
CMRR
Common-Mode Rejection Ratio f = 217Hz, V_RMS = 200mV_PP
56
dB
(1) Absolute Maximum Ratings indicate limits beyond which damage to the device may occur, including inoperability and degradation of
device reliability and/or performance. Functional operation of the device and/or non-degradation at the Absolute Maximum Ratings or
other conditions beyond those indicated in the Recommended Operating Conditions is not implied. The Recommended Operating
Conditions indicate conditions at which the device is functional and the device should not be operated beyond such conditions. All
voltages are measured with respect to the ground pin, unless otherwise specified.
(2) The Electrical Characteristics tables list specified specifications under the listed Recommended Operating Conditions except as
otherwise modified or specified by the Electrical Characteristics Conditions and/or Notes. Typical specifications are estimations only and
are not ensured.
(3) Typical values represent most likely parametric norms at T_A = +25ºC, and at the Recommended Operation Conditions at the time of
product characterization and are not ensured.
(4) Datasheet min/max specification limits are ensured by test or statistical analysis.
(5) Enabling mono bit (MONO_ONLY in Output Control Register 01h) will save 400μA (typ) form specified current.
(6) Shutdown current is measured in a normal room environment.
6
Submit Documentation Feedback
Copyright © 2008–2013, Texas Instruments Incorporated
Product Folder Links: LM49321 LM49321RLEVAL