max9856 Maxim Integrated Products, Inc., max9856 Datasheet - Page 7

• Manufacturer Part Number: max9856
• Description: Max9856 Low-power Audio Codec With Directdrive Headphone Amplifiers
• Manufacturer: Maxim Integrated Products, Inc.

ELECTRICAL CHARACTERISTICS (continued)
(V
C
otherwise noted. Typical values are at T
Total Harmonic Distortion Plus
Noise
MIC Power-Supply Rejection
Ratio
MICROPHONE BIAS
MICBIAS Output Voltage
MICBIAS Load Regulation
MICBIAS Capacitive Load
MICBIAS Short-Circuit Current
MICBIAS Power-Supply Rejection
Ratio
MICBIAS Noise Voltage
AUTOMATIC GAIN CONTROL
Threshold Level
Attack Time
Release Time
Hold Time
Gain Adjustment Range
ADC LOW-LEVEL QUIETING
NG Attack and Release Time
NG Threshold Level
NG Attenuation
NREG
AVDD
= 1µF, A
= V
PARAMETER
CPVDD
VPRE
= V
_______________________________________________________________________________________
= +20dB, C
DVDDS2
= V
MICBIAS
DVDD
V
SYMBOL
V
NOISEMIC
THD+N
DirectDrive Headphone Amplifiers
MICBIAS
PSRR
PSRR
A
BIAS
= 1.8V, R
= +25°C.) (Note 1)
= 1µF, A
Low-Power Audio CODEC with
A
V
A
V
A
V
V
V
V
V
V
I
Minimum capacitive load
To GND
V
T
V
V
MBSET = 0 or 1
Set by AGCSTH[3:0]
Set by AGCATK[1:0]
Set by AGCRLS[2:0]
Set by AGCHLD[1:0]
A
A
A
Full 12dB quieting at 1dB of
attenuation/(gain) for every 2dB
decrease/(increase) of signal level
(immediate release if PGA < 20dB gain
when AGC is enabled)
ANTH[3:0] setting range (AGC off) (AGC on
adjusts these values by 20dB since low-
level signals cause maximum AGC gain in
the PGA)
1dB of attenuation for every 2dB signal
amplitude decrease from NG threshold
MICBIAS
A
VPRE
IN
VPRE
IN
VPRE
IN
AVDD
RIPPLE
RIPPLE
AVDD
AVDD
AVDD
RIPPLE
RIPPLE
VPRE
VPRE
VPRE
HP
VMICPGA
= +25°C
= 500mV
= 50mV
= 18mV
= 32Ω, R
= +30dB, A
= 0dB, A
= +20dB, A
= +30dB
= +20dB
= 0dB
=1.71V to 3.6V, T
= 1.8V (MBSEL = 0 register setting)
= 3.0V (MBSEL = 1 register setting)
= 1.71V to 3.6V, MBSEL = 0,
= 100mV at 1kHz, input referred
= 100mV at 10kHz, input referred
= 100mV at 1kHz
= 100mV at 10kHz
= 0 to 2mA
= 0dB, MCLK = 11.2896MHz, DRATE = 00, T
P-P
P-P
P-P
LINE
, f = 1kHz, A-weighted
, f = 1kHz, A-weighted
CONDITIONS
VMICPGA
, f = 1kHz, A-weighted
VMICPGA
VMICPGA
= 10kΩ, C1 = 4.7µF, C2 = 4.7µF, C
f = 10Hz to 20kHz
f = 1kHz
A
= 0dB,
= +25°C
= 0dB,
= 0dB,
0.078
MIN
1.4
2.3
-64
79
75
50
-3
3
0
30 to 50
20 to 40
0 to 20
REF
TYP
0.04
0.08
0.08
1.5
2.4
0.8
0.5
A
80
80
50
14
86
86
76
20
1
3
= T
= C
MIN
10.000
MBIAS
MAX
200
400
-18
-28
1.6
2.5
10
12
to T
MAX
= C
nV/√Hz
UNITS
µV
, unless
PREG
mA
ms
ms
dB
dB
dB
dB
dB
dB
µF
%
Ω
V
RMS
s
s
7
=