Datasheet
LM4549B
SNAS598A –JULY 2012–REVISED MAY 2013
www.ti.com
Electrical Characteristics
(1)(2)
(continued)
The following specifications apply for AV
DD
= 5V, DV
DD
= 3.3V, Fs = 48 kHz, single codec configuration, (primary mode)
unless otherwise noted. Limits apply for T
A
= 25°C. The reference for 0 dB is 1 Vrms unless otherwise specified.
LM4549B
Units
Symbol Parameter Conditions
Typical Limit
(Limits)
(3) (4)
I
DSD
Digital Shutdown Current PR543210 = 111111 19 µA
I
ASD
Analog Shutdown Current PR543210 = 111111 70 µA
V
REF
Reference Voltage No pullup resistor 2.16 V
PSRR Power Supply Rejection Ratio 40 dB
Analog Loopthrough Mode
(5)
CD Input to Line Output, -60 dB Input
Dynamic Range
(6)
97 90 dB (min)
THD+N
THD Total Harmonic Distortion V
O
= -3 dB, f = 1 kHz, R
L
= 10 kΩ 0.013 0.02 % (max)
Analog Input Section
LINE_IN, AUX, CD, VIDEO, PC_BEEP,
V
IN
Line Input Voltage 1 Vrms
PHONE
V
IN
Mic Input with 20 dB Gain 0.1 Vrms
V
IN
Mic Input with 0 dB Gain 1 Vrms
Xtalk Crosstalk CD Left to Right -95 dB
Z
IN
Input Impedance
(6)
All Analog Inputs 40 10 kΩ (min)
C
IN
Input Capacitance
(6)
3.7 7 pF
Interchannel Gain Mismatch CD Left to Right 0.1 dB
Record Gain Amplifier - ADC
A
S
Step Size 0 dB to 22.5 dB 1.5 dB
A
M
Mute Attenuation
(7)
86 dB
Mixer Section
A
S
Step Size +12 dB to -34.5 dB 1.5 dB
A
M
Mute Attenuation 86 dB
Analog to Digital Converters
Resolution 18 Bits
Dynamic Range
(7)
-60 dB Input THD+N, A-Weighted 90 86 dB (min)
Frequency Response -1 dB Bandwidth 20 kHz
Digital to Analog Converters
Resolution 18 Bits
Dynamic Range
(7)
-60 dB Input THD+N, A-Weighted 89 82 dB (min)
THD Total Harmonic Distortion V
IN
= -3 dB, f = 1 kHz, R
L
= 10 kΩ 0.01 %
Frequency Response 20 - 21 k Hz
Group Delay
(7)
Sample Frequency = 48 kHz 0.36 1 ms (max)
Out of Band Energy
(8)
-40 dB
Stop Band Rejection 70 dB
D
T
Discrete Tones -96 dB
Analog Output Section
A
S
Step Size 0 dB to -46.5 dB 1.5 dB
A
M
Mute Attenuation 86 dB
Z
OUT
Output Impedance
(7)
All Analog Outputs 220 Ω
Digital I/O
(7)
(5) Loopthrough mode describes a path from an analog input through the analog mixer to an analog output
(6) These specifications are ensured by design and characterization; they are not production tested.
(7) These specifications are ensured by design and characterization; they are not production tested.
(8) Out of band energy is measured from 28.8 kHz to 100 kHz relative to a 1 Vrms DAC output.
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