LM4809_14 Datasheet, PDF (8/30 Pages) Texas Instruments – Dual 105mW Headphone Amplifier with Active- Low Shutdown Mode

LM4809, LM4809LQBD
SNAS126E – MAY 2004 – REVISED MAY 2004
Electrical Characteristics V_DD = 2.6V ^{(1) (2)}
The following specifications apply for V_DD = 2.6V unless otherwise specified, limits apply to T_A = 25°C.
Symbol
Parameter
Conditions
LM4809
Typ
(3)
Limit
(4)
I_DD
I_SD
V_OS
P_O
THD+N
Crosstalk
PSRR
V_SDIH
V_SDIL
Supply Current
Shutdown Current
Output Offset Voltage
Output Power
Total Harmonic Distortion
Channel Separation
Power Supply Rejection Ratio
Shutdown Voltage Input High
Shutdown Voltage Input Low
V_IN = 0V, I_O = 0A
V_IN = 0V, V_SHUTDOWN = GND
V_IN = 0V
THD+N = 0.1%, f = 1kHz
R_L = 16Ω
R_L = 32Ω
P_O = 15mW, R_L = 32Ω
f = 20Hz to 20kHz
R_L = 32Ω; P_O = 15mW
C_B = 1.0µF; V_RIPPLE = 200mV_PP,
f = 1kHz; Input terminated into 50Ω
0.9
0.2
4.0
20
16
0.6
70
70
0.8 x V_DD
0.2 x V_DD
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Units
(Limits)
mA
µA
mV
mW
mW
%
dB
dB
V (min)
V (max)
(1) Absolute Maximum Ratings indicate limits beyond which damage to the device may occur.
(2) All voltages are measured with respect to the ground pin, unless otherwise specified.
(3) Typical specifications are specified at +25OC and represent the most likely parametric norm.
(4) Datasheet min/max specification limits are guaranteed by design, test, or statistical analysis.
External Components Description
(Figure 1)
Components
Functional Description
1. R_i
2. C_i
3. R_f
4. C_S
The inverting input resistance, along with R_f, set the closed-loop gain. R_i, along with C_i, form a high pass filter with f_c =
1/(2πR_iC_i).
The input coupling capacitor blocks DC voltage at the amplifier's input terminals. C_i, along with R_i, create a highpass filter
with f_C = 1/(2πR_iC_i). Refer to the section, Selecting Proper External Components, for an explanation of determining the
value of C_i.
The feedback resistance, along with R_i, set closed-loop gain.
This is the supply bypass capacitor. It provides power supply filtering. Refer to the Application Information section for
proper placement and selection of the supply bypass capacitor.
5. C_B
6. C_O
This is the BYPASS pin capacitor. It provides half-supply filtering. Refer to the section, Selecting Proper External
Components, for information concerning proper placement and selection of C_B.
This is the output coupling capacitor. It blocks the DC voltage at the amplifier's output and forms a high pass filter with R_L at
f_O = 1/(2πR_LC_O)
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