MAX9856 Datasheet, PDF (6/46 Pages) Maxim Integrated Products – Low-Power Audio CODEC with DirectDrive Headphone Amplifiers

Low-Power Audio CODEC with
DirectDrive Headphone Amplifiers
ELECTRICAL CHARACTERISTICS (continued)
(V_AVDD = V_CPVDD = V_DVDDS2 = V_DVDD = 1.8V, R_HP = 32Ω, R_LINE = 10kΩ, C1 = 4.7µF, C2 = 4.7µF, C_REF = C_MBIAS = C_PREG =
C_NREG = 1µF, A_VPRE = +20dB, C_MICBIAS = 1µF, A_VMIGPGA = 0dB, f_MCLK = 11.2896MHz, DRATE = 00, T_A = T_MIN to T_MAX, unless
otherwise noted. Typical values are at T_A = +25°C.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
Total Harmonic Distortion Plus
Noise
THD+N V_OUT = 1V_RMS, f = 1kHz
0.024
%
Signal-to-Noise Ratio
SNR
98
dB
Power-Supply Rejection Ratio
PSRR
V_AVDD = 1.71V to 3.6V
V_RIPPLE = 100mV_P-P, f = 217Hz
70
108
93
dB
Capacitive Drive
V_RIPPLE = 100mV_P-P, f = 10kHz
C_L
No sustained oscillations
60
150
pF
Crosstalk
V_OUT = 2V_P-P, f = 1kHz, (LOUTL to LOUTR)
98
dB
or (LOUTR to LOUTL)
Channel Gain Matching
VOLUME CONTROL
A_VMATCH
±2
%
Headphone Volume Control
Range
-74.0
+5.5
dB
Headphone Volume Control Step
Size
Headphone Mute Attenuation
CHARGE PUMP
5.5dB to 2dB
+2.5dB to -2dB
-2dB to -46dB
-46dB to -74dB
f = 1kHz
0.5
1
dB
2
4
92
dB
Charge-Pump Oscillator
Frequency
f_OSC T_A = +25°C
600
665
720
kHz
MICROPHONE AMPLIFIERS
Preamplifier Gain
MIC PGA Gain
MIC PGA Gain Step Size
MIC Mute Attenuation
PALEN/PAREN = 01
-0.5
0
+0.5
A_VPRE MICL or MICR
PALEN/PAREN = 10
19
20
21
dB
PALEN/PAREN = 11
28.5 30.0 31.5
PGAML/R = 0x20
A_{VMICPGA PGAML/R = 0x00}
-0.5
0
+0.5
dB
19.5 20.0 19.5
1
dB
f = 1kHz
92
dB
Common-Mode Rejection Ratio
MIC Input Resistance
MIC Input Resistance Matching
MIC Input Bias Voltage
Input Voltage Noise
CMRR
R_{IN_MIC}
R_MATCH
V_CML
INL±, V_IN = 100mV_P-P at 217Hz,
A_VPRE = +20dB
INL±, MICL or MICR, A_VPRE = +30dB
INL±, MICL or MICR, A_VPRE = +20dB
INL±, MICL or MICR, A_VPRE = 0dB
INL+ to INL- or MICL/MICR to AGND
Measured at INL±, MICR, MICL, and AGND
f = 1kHz, A_VPRE = +30dB
4
12
60
-0.05
73
dB
8
10
18
28
kΩ
100
160
1
%
0
+0.05
V
15
nV/√Hz
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