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參數(shù)資料
| 型號： | PCM1738E2K |
| 英文描述： | 24-Bit, 192kHz Sampling, Advanced Segment, Audio-Stereo DIGITAL-TO-ANALOG CONVERTER |
| 中文描述： | 24位192kHz采樣，高級分段，音頻立體聲數(shù)字模擬轉換器 |
| 文件頁數(shù)： | 23/33頁 |
| 文件大小： | 2274K |
| 代理商： | PCM1738E2K |
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PCM1738
SBAS174B
23
FIGURE 9. Typical Application for Analog Output Stage.
ANALOG OUTPUTS
Analog Gain by Balanced Amplifier
The I/V converters are followed by balanced amplifier
stages that sum the differential signals for each channel,
creating a single-ended voltage output. In addition, the
balanced amplifiers provide a second-order, low-pass filter
function that band limits the audio output signal. The cutoff
frequency and gain is given by external R and C component
values. In the case of Figure 9, the cutoff frequency is 45kHz
with a gain of 1. The output voltage for each channel is 6.2
Vp-p, or 2.2Vrms.
REFERENCE CURRENT RESISTOR
As shown in the analog output application circuit, marked
R
1
on Figure 9, there is a resistor connected from I
REF
(pin
21) to the analog ground, designated as R
1
. This resistor sets
the current for the internal reference circuit. The value of R
1
must be 16k
,
1% in order to match the specified gain
error shown in the Specifications table.
ANALOG OUTPUT LEVEL AND I/V CONVERTER
The signal level of the DAC current output pins (I
OUT
L+,
I
OUT
L–, I
OUT
R+, and I
OUT
R–) is
2.48mA (p-p) at 0dB (Full
Scale). The voltage output of the I/V converter is given by
the following equation:
V
OUT
=
2.48mApp R
F
(1)
Here, R
f
is the feedback resistor in the I/V (current-to-
voltage) conversion circuit, R
11
, R
12
, R
21
, and R
22
on a
typical application circuit. The common level of the I/V
conversion circuit must be the same as the common level of
DAC I
OUT
that is given by the V
COM
2 reference voltage,
+2.5V DC. The non-inverting inputs of the op amps shown
in the I/V circuits are connected to V
COM
2 to provide the
common bias voltage.
Op Amp for I/V Converter Circuit
The OPA627BP/BM, or 5534 type op amp, is recommended
for the I/V conversion circuit to obtain specified audio
performance. Dynamic performance, such as gain band-
width, settling time, and slew rate of the op amp creates
audio dynamic performance at the I/V section. Input noise
specification of the op amp should be considered to obtain
120dB S/N ratio.
V
CC
3
AGND2
I
OUT
L–
I
OUT
L+
V
CC
2
V
CC
1
V
COM
3
I
REF
V
COM
2
V
COM
1
AGND1
I
OUT
R+
I
OUT
R–
MUTE
28
27
26
25
24
23
22
21
20
19
18
17
16
15
PCM1738E
+
+
+
+5.0V
10
F
10
F
R
1
16k
0.1
F
V
OUT
L-Channel
+
10
F
C
11
C
13
C
14
C
17
R
13
R
11
R
12
R
16
C
15
R
14
R
17
C
16
R
18
R
15
C
12
C
21
C
22
10
F
V
OUT
R-Channel
C
23
C
24
C
27
R
23
R
21
R
22
R
26
C
25
R
24
R
27
C
26
R
28
R
25
OPA627BP, BM
or OPA5534 Op Amp
OPA134, OPA2134, or
OPA604, OPA2604 Op Amp
NOTE: Example R/C values for f
C
45kHz.
R
11
-R
18
, R
21
-R
28
: 620
, C
11
, C
12
, C
21
, C
22
: not populated, C
13
, C
14
,
C
23
, C
24
: 5600pF, C
15
, C
25
: 8200pF, C
16
, C
17
, C
26
, C
27
: 1800pF.
+
-
+
-
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