LC89075W-H SANYO [Sanyo Semicon Device], LC89075W-H Datasheet - Page 20

• Manufacturer Part Number: LC89075W-H
• Description: Digital Audio Interface Receiver with Stereo ADC and Audio Selector
• Manufacturer: SANYO [Sanyo Semicon Device]

9.3 Digital HPF
• The ADC incorporates a digital HPF to cancel the DC offset.
• The HPF cutoff frequency is 1.85Hz when fs=48kHz. The frequency response is proportional to fs.
9.4 PGA
• The LC89075W-H incorporates an analog PGA (Programmable Gain Amplifier).
• The PGA can be set to -4.5dB to +6dB in 1.5dB steps with the ADPGA[2:0] register.
• The input impedance is 27kΩ, and the ADC full-scale input is proportional to the AV DD voltage. V IN =0.6×AV DD
R-ch
L-ch
Rin = 27kΩ
R1 = 27kΩ
C1 = 1μF
fc = 1/(2π(Rin+R1)C1) = 1/(2π×(27k+27k)×1μ) = 2.947Hz
Zi = Rin+R1 = 27k+27k = 54kΩ
R1
R1
Figure 9.2 Internal PGA Analog Input Configuration Diagram
C1
C1
LC89075W-H
ADINR
ADINL
Rin
Rin
ADPGA[3:0]
ΔΣ
ΔΣ
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