UPD63310GK-9EU NEC, UPD63310GK-9EU Datasheet - Page 12

• Manufacturer Part Number: UPD63310GK-9EU
• Description: STEREO SOUND CODEC
• Manufacturer: NEC

2. SYSTEM CONNECTIONS
2.1 Analog Input Block
frequency. Accordingly, if there is no input of high-frequency noise that is close to MCLK/2 (= 128 fs), the filter (LPF)
inserted before the analog block can be omitted (see Figure 2-1).
should be inserted.
the signal that is input to an analog audio signal input pin does not exceed 1.4 V
exceeds 2.8 V
prevent the volume control from operating normally (such as when there is signal leakage during mute mode).
2.2 Mic Amp
setting is adjusted by changing R1. R2 is fixed at 100 k
expression.
output from the DAC), the mic amp’s output pin should be connected via a coupling capacitor to one of the analog signal
input pins (see Figure 2-1).
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A frequency that is one half of the master clock (MCLK) frequency is used as the ADC’s and DAC’s oversampling
The analog signal input pins (pins 1 to 9) are internally biased to 1.4 V (TYP.), so a coupling capacitor (1 to 4.7 F)
The full scale analog input signal level is 1.4 V
Analog signal input pins that are not used should be left unconnected or connected to a GND pin via a capacitor.
The mic amp’s gain can be adjusted (between 10 dB (MIN.) and 30 dB (MAX.)) via an external resistor. The gain
Mic amp gain calculation: A
Since the mic amp is independent from other blocks, if the mic amp’s output is input to the ADC (or is mixed with
Separate the unused mic amp from R1 and the electrolytic capacitors (shown in Figure 2-2) and set 0
Remark When the above example is a constant, the mic amp’s gain becomes about 21 dB.
p-p
, the analog signal input pin’s voltage may become less than 0 V during negative amplitude, which may
Figure 2-1. Analog Input Block Connection Example (Using IN1R Pin)
Figure 2-2. Mic Amp Connection Example (Using Right Side)
V
= 20 log ((R2 + R1)/R1) [dB]
4.7 F
4.7 F
To analog signal input pins
+
+
4.7 F
p-p
R2 = 100 k
R1 = 10 k
R1 = 10 k
R2 = 100 k
(TYP.). Adjust the transmitting side’s level so that the amplitude of
+
To VXRO
IN1R etc.
(see Figure 2-2). Gain is calculated via the following
MICPR
MICNR
MICOR
p-p
. In particular, if this signal’s amplitude
for R2.
PD63310