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ADAU1702 Datasheet

  • ADAU1702

  • SigmaDSP? 28/56-Bit Audio Processor with 2ADC/4DAC

  • 38頁(yè)

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ADAU1702
AUDIO ADCS
The ADAU1702 has two 危-螖 ADCs. The signal-to-noise ratio
(SNR) of the ADCs is 100 dB and the THD + N is 鈭?3 dB.
The stereo audio ADCs are current input; therefore, a voltage-
to-current resistor is required on the inputs. This means that
the voltage level of the input signals to the system can be set to
any level; only the input resistors need to be scaled to provide
the proper full-scale current input. The ADC0 and ADC1 input
pins, as well as ADC_RES, have an internal 2 k惟 resistor for
ESD protection. The voltage seen directly on the ADC input
pins is the 1.5 V common mode.
The external resistor connected to ADC_RES sets the full-scale
current input of the ADCs. The full range of the ADC inputs is
100 渭A
rms
with an external 18 k惟 resistor on ADC_RES (20 k惟
total, because it is in series with the internal 2 k惟). The only
reason to change the ADC_RES resistor is if a sampling rate
other than 48 kHz is used.
The voltage-to-current resistors connected to ADC0/ADC1 set
the full-scale voltage input of the ADCs. With a full-scale current
input of 100 渭A
rms,
a 2.0 V
rms
signal with an external 18 k惟 resistor
(in series with the 2 k惟 internal resistor) results in an input using
the full range of the ADC. The matching of these resistors to the
ADC_RES resistor is important to the operation of the ADCs.
For these three resistors, a 1% tolerance is recommended.
Either the ADC0 and/or ADC1 input pins can be left
unconnected if that channel of the ADC is unused.
These calculations of resistor values assume a 48 kHz sample
rate. The recommended input and current setting resistors
scale linearly with the sample rate because the ADCs have a
switched-capacitor input. The total value (2 k惟 internal plus
external resistor) of the ADC_RES resistor with sample rate
f
S_NEW
can be calculated as follows:
The values of the resistors (internal plus external) in series with
the ADC0 and ADC1 pins can be calculated as follows:
R
Input Total
=
(
RMS Input Voltage
)
脳
10 k惟
脳
48,000
f
S
_
NEW
Table 13 lists the external and total resistor values for common
signal input levels at a 48 kHz sampling rate. A full-scale rms
input voltage of 0.9 V is shown in the table because a full-scale
signal at this input level is equal to a full-scale output on the DACs.
Table 13. ADC Input Resistor Values
Full-Scale
RMS Input
Voltage (V)
0.9
1.0
2.0
ADC0/ADC1
Resistor
Value (k惟)
7
8
18
Total ADC0/ADC1
Input Resistance
(External +
Internal) (k惟)
9
10
20
ADC_RES
Value (k惟)
18
18
18
Figure 17 shows a typical configuration of the ADC inputs for
a 2.0 V
rms
input signal for a f
S
of 48 kHz. The 47 渭F capacitors are
used to ac-couple the signals so that the inputs are biased at 1.5 V.
ADAU1702
47碌F
18k鈩?/div>
ADC0
47碌F
18k鈩?/div>
ADC1
ADC_RES
Figure 17. Audio ADC Input Configuration
R
total
=
20 k惟
脳
48,000
f
S
_
NEW
Rev. 0 | Page 19 of 52
05798-008
18k鈩?/div>

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