Datasheet
OBSOLETE
LM4550
SNAS032F –SEPTEMBER 2001–REVISED APRIL 2013
www.ti.com
Electrical Characteristics
The following specifications apply for AV
DD
= 5V, DV
DD
= 5V, Fs = 48 kHz, single codec configuration, unless otherwise
noted. Limits apply for T
A
= 25°C. The reference for 0 dB is 1 Vrms unless otherwise specified.
(1)(2)
LM4550
Units
Symbol Parameter Conditions
(Limits)
Typical
(3)
Limit
(4)
AV
DD
Analog Supply Range 4.2 V (min)
5.5 V (max)
DV
DD
Digital Supply Range 3.0 V (min)
5.5 V (max)
D
IDD
Digital Quiescent Power Supply Current DV
DD
= 5 V 43 mA
DV
DD
= 3.3 V 20 mA
Analog Quiescent Power Supply
A
IDD
53 mA
Current
I
DSD
Digital Shutdown Current 500 µA
I
ASD
Analog Shutdown Current 30 µA
V
REF
Reference Voltage 2.23 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, A-Weighted
THD Total Harmonic Distortion V
O
= -3 dB, f = 1 kHz, R
L
= 10 kΩ 0.01 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 15 pF
Interchannel Gain Mismatch CD Left to Right 0.01 dB
Record Gain Amplifier - ADC
A
S
Step Size 0 dB to 22.5 dB 1.5 dB
A
M
Mute Attenuation
(6)
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
(6)
-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
(6)
-60 dB Input THD+N, A-Weighted 89 85 dB (min)
(1) 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.
(2) All voltages are measured with respect to the ground pin, unless otherwise specified.
(3) Typicals are measured at 25°C and represent the parametric norm.
(4) Limits are ensured to AOQL (Average Outgoing Quality Level).
(5) Loopthrough Mode describes a path from an analog input through the analog mixers to an analog output.
(6) These specifications are ensured by design and characterization; they are not production tested.
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