Datasheet

MAX9725
1V, Low-Power, DirectDrive, Stereo Headphone
Amplifier with Shutdown
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS (MAX9725A–MAX9725D) (continued)
(V
DD
= 1.5V, V
PGND
= V
SGND
= 0V, V
SHDN
= 1.5V, V
SS
= V
PVSS
, C1 = C2 = 1µF, C
IN
= 1µF, R
L
= ∞, T
A
= T
MIN
to T
MAX,
unless other-
wise noted. Typical values are at T
A
= +25°C.) (See the Functional Diagrams. ) (Note 1)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
R
L
= 32Ω, P
OUT
= 12mW, f = 1kHz 0.006
Total Harmonic Distortion Plus
Noise
THD+N
R
L
= 16Ω, P
OUT
= 15mW, f = 1kHz 0.015
%
BW = 22Hz to 22kHz 89
Signal-to-Noise Ratio SNR R
L
= 32Ω, P
OUT
= 12mW
A-weighted filter 92
dB
Slew Rate SR 0.2 V/µs
Maximum Capacitive Load C
L
No sustained oscillations 150 pF
Crosstalk XTALK f
IN
= 1.0kHz, R
L
= 32Ω, P
OUT
= 5mW 100 dB
Into shutdown 72.8
Click-and-Pop Level K
CP
R
L
= 32Ω, peak voltage,
A-weighted, 32 samples per
second (Note 4)
Out of shutdown 72.8
dBV
ESD Protection V
ESD
Human Body Model (OUTR, OUTL) ±8 kV
ELECTRICAL CHARACTERISTICS (MAX9725E)
(V
DD
= 1.5V, V
PGND
= V
SGND
= 0V, V
SHDN
= 1.5V, V
SS
= V
PVSS
, C1 = C2 = 1µF, C
IN
= 1µF, R
L
= 32Ω, R
F
= 60kΩ, R
IN
= 10kΩ, T
A
=
T
MIN
to T
MAX,
unless otherwise noted. Typical values are at T
A
= +25°C.) (See the Functional Diagrams. ) (Note 1)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Supply Voltage Range V
DD
Guaranteed by PSRR test 0.9 1.8 V
Quiescent Supply Current I
DD
Both channels active 2.3 3.7 mA
T
A
= +25°C 0.6 1
Shutdown Current I
SHDN
V
SHDN
= 0V
T
A
= -40°C to +85°C10
µA
Shutdown to Full Operation t
ON
180 µs
V
IH
V
DD
= 0.9V to 1.8V 0.7 x V
DD
SHDN Thresholds
V
IL
V
DD
= 0.9V to 1.8V 0.3 x V
DD
V
SHDN Input Leakage Current I
LEAK
V
DD
= 0.9V to 1.8V (Note 2) ±1µA
CHARGE PUMP
Oscillator Frequency f
OSC
483 592 687 kHz
AMPLIFIERS
Voltage Gain A
V
(Note 5) -6.11 -6.07 -6.00 V/V
Minimum Stable Gain ΔA
V
-1.0 V/V
Total Output Offset Voltage V
OS
Input AC-coupled, R
L
= 32Ω to GND,
T
A
= +25°C (Note 6)
±0.63 ±2.1 mV
Input Resistance R
IN
6.3 9.78 14 kΩ
INR, INL Input Leakage
Current
I
LK
±100 nA
Maximum Input Parasitic
Capacitance
C
PAR
5pF
V
DD
= 0.9V to 1.8V, T
A
= +25°C 52.9 67.8
f
IN
= 1kHz 70
Power-Supply Rejection Ratio PSRR
100mV
P-P
ripple
(Note 5)
f
IN
= 20kHz 62
dB