Rainbow Electronics MAX98088 - Manual (Page 11)

Stereo Audio Codec
with FLEXSOUND Technology
MAX98088
11
ELECTRICAL CHARACTERISTICS (continued)
(V AVDD = V PVDD = V DVDD = V DVDDS1 = V DVDDS2 = +1.8V, V SPKLVDD = V SPKRVDD = 3.7V. Speaker loads (Z SPK ) connected
between SPK_P and SPK_N. Receiver load (R
REC
) connected between RECP and RECN. Headphone loads (R
HP
) connected from
HPL or HPR to HPGND. Line out loads (R LOAD ) connected from LOUTL and LOUTR to ground. R LOAD = R HP = J, R REC = J, Z SPK
= J, C REF = 2.2FF, C MICBIAS = C REG = 1FF, C C1N-C1P = 1FF, C HPVDD = C HPVSS = 1FF. AV MICPRE_ = +20dB, AV MICPGA_ = 0dB,
AV DACATTN = 0dB, AV DACGAIN = 0dB, AV ADCLVL = 0dB, AV ADCGAIN = 0dB, AV PGAIN_ = 0dB, AV HP_ = 0dB, AV REC = 0dB, AV SPK_
= 0dB, MCLK = 12.288MHz, LRCLK = 48kHz, MAS = 1. T A = +25NC, unless otherwise noted.) (Note 1)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
ADC STEREO AUDIO MODE DC BLOCKING HIGHPASS FILTER (MODE1 = 1)
Passband Cutoff
(-3dB from Peak)
f AHPPB AVFLT ≠ 000
0.000125
x f S
Hz
DC Attenuation DC Atten AVFLT ≠ 000 90 dB
MICROPHONE AUTOMATIC GAIN CONTROL
AGC Hold Duration
AGCHLD = 01 50
ms
AGCHLD = 11 400
AGC Attack Time
AGCATK = 00 2
ms
AGCATK = 11 123
AGC Release Time
AGCRLS = 000 0.078
s
AGCRLS = 111 10
AGC Threshold Level AGCTH = 0x0 to 0xF -3 +18 dB
AGC Threshold Step Size 1 dB
AGC Gain (Note 5) 0 20 dB
ADC NOISE GATE
NG Threshold Level
ANTH = 0x3 to 0xF, referred to 0dBFS -64 -16 dB
NG Attenuation (Note 5) 0 12 dB
ADC-TO-DAC DIGITAL SIDETONE (MODE = 0)
Sidetone Gain Adjust
Range
AV STGA
DVST = 0x01 -0.5
dB
DVST = 0x1F -60.5
Sidetone Gain Adjust Step
Size
2 dB
Sidetone Path Phase Delay
1kHz, 0dB input, highpass filter
disabled 8kHz 2.2
ms
16kHz 1.1
ADC-TO-DAC DIGITAL LOOP-THROUGH PATH
Dynamic Range (Note 4) DR
f S = 48kHz, MCLK = 12.288MHz, MODE = 1
(FIR audio), MIC to HP output, T A = +25NC
83 93 dB
Total Harmonic Distortion
+ Noise
THD+N
f = 1kHz, f
S
= 48kHz, MCLK = 12.288MHz, MODE
= 1 (FIR audio), MIC to HP output
81 dB
DAC LEVEL CONTROL
DAC Attenuation Range
AV DACATTN DV1DV2 = 0xF to 0x0 (Note 5) -15 0 dB
DAC Attenuation Step Size 1 dB
DAC Gain Adjust Range AV DACGAIN DV1G = 00 to 11 (Note 5) 0 18 dB
DAC Gain Adjust Step Size 6 dB