Rainbow Electronics MAX9860 - Manual (Page 6)

MAX9860
16-Bit Mono Audio Voice Codec
6 _______________________________________________________________________________________
ELECTRICAL CHARACTERISTICS (continued)
(V AVDD = V DVDD = V DVDDIO = +1.8V, R L = ∞, headphone load (R
L ) connected between OUTP and OUTN, C REF = 2.2µF, C MICBIAS =
C PREG = C REG = 1µF, A VPRE = +20dB, A VMICPGA = 0dB, MCLK = 13MHz, LRCLK = 8kHz, T A = T MIN to T MAX , unless otherwise noted.
Typical values are at T A = +25°C.) (Note 2)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
MICROPHONE AMPLIFIER
PAM = 00 Off
PAM = 01 -0.5 0 +0.5
PAM = 10 19 20 21
Preamplifier Gain A VPRE T A = +25°C
PAM = 11 29 30 31
dB
PGAM = 0x14–0x1F 0
MIC PGA Gain A VMICPGA
PGAM = 0x00 +20
dB
MIC PGA Gain Step Size 1 dB
Common-Mode Rejection Ratio CMRR V IN = 100mV P-P at 217Hz 50 dB
MIC Input Resistance R IN_MIC
All gain settings, measured at
MICLN/MICRN
30 50 k Ω
MIC Input Bias Voltage 0.7 0.8 0.9 V
A VPRE = 0dB, A VMICPGA = 0dB,
V IN = 1V P-P , f = 1kHz
-75 dB
Total Harmonic Distortion + Noise THD+N
A
VPRE
= +30dB, A
VMICPGA
= 0dB,
V IN = 31mV P-P , f = 1kHz
-66 dB
AVDD = 1.7V to 1.9V 60 95 dB
V RIPPLE = 100mV at 1kHz, input referred 82 dB
MIC Power-Supply Rejection
Ratio
PSRR
V RIPPLE = 100mV at 10kHz, input referred 76 dB
MICROPHONE BIAS
MICBIAS Output Voltage V MICBIAS I LOAD = 1mA, T A = +25°C 1.5 1.55 1.6 V
Load Regulation I LOAD = 1mA to 2mA 0.2 10 mV
V RIPPLE = 100mV P-P at 217Hz 82 dB
MICBIAS Line Ripple Rejection LRR
V RIPPLE = 100mV P-P at 10kHz 81 dB
MICBIAS Noise Voltage A-weighted 9.5 µV RMS
AUTOMATIC GAIN CONTROL
AGC Hold Duration AGCHLD[1:0] setting range, FREQ ≠ 0 50 400 ms
AGC Attack Time AGCATK[1:0] setting range, FREQ ≠ 0 3 200 ms
AGC Release Time AGCRLS[2:0] setting range, FREQ ≠ 0 0.078 10 s
AGC Threshold Level AGCSTH[3:0] setting range, FREQ ≠ 0 -3 -18 dB
NOISE GATE
NG Attack and Release Time 0.5 s
NG Threshold Level -72 -16 dB
Noise Gate Threshold Step Size 4 dB
NG Attenuation 0 12 dB
DIGITAL SIDETONE
Sidetone Gain Adjust DVST 2dB steps -60 0 dB
8kHz 2.2
Sidetone Phase Delay PDLY
MIC input to headphone
output, f = 1kHz, HP filter
disabled
16kHz 1.1
ms