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PCM1738E/2K Datasheet(PDF) 31 Page - Texas Instruments

Part # PCM1738E/2K
Description  24-Bit, 192-kHz Sampling, Advanced Segment, Audio-Stereo Digital-to-Analog Converter
PDF  47 Pages
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Manufacturer  TI2 [Texas Instruments]
Direct Link  https://www.ti.com
Logo TI2 - Texas Instruments

PCM1738E/2K Datasheet(HTML) 31 Page - Texas Instruments

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ANALOG OUTPUTS
28
27
26
25
24
23
22
21
20
19
18
17
16
15
PCM1738E
+
+
+5V
10 F
m
10 F
m
0.1 F
m
+
10 F
m
10 F
m
V
3
CC
AGND2
I
OUTL–
I
OUTL+
V
CC2
V
CC1
V
COM3
I
REF
V
COM2
V
COM1
AGND1
I
OUTR+
I
OUTR–
MUTE
R
1
16kW
C
11
C
12
C
21
C
13
C
17
C
27
C
23
C
15
C
16
C
14
C
24
R
11
R
21
R
15
R
25
R
12
R
22
R
13
R
23
R
14
R
24
R
16
R
26
R
17
R
27
R
18
C
22
V
L-Channel
OUT
V
R-Channel
OUT
C
25
C
26
R
28
NOTE:ExampleR/CValuesforf 45kHz.
C
R –R ,R –R :620
C ,C ,C ,C :NotPopulated
C ,C ,C ,C :5600pF
C ,C :8200pF
C ,C ,C ,C :1800pF
11
18
21
28
11
12
21
22
13
14
23
24
15
25
16
17
26
27
W
OPA627BP,BM
orOPA5534Op Amp
OPA134,OPA2134,or
OPA604,OPA2604Op Amp
S0242-01
ANALOG OUTPUT LEVEL AND I/V CONVERTER
Operational Amplifiers for I/V Converter Circuit
PCM1738
SBAS174C – FEBRUARY 2002 – REVISED FEBRUARY 2007
Figure 40. Typical Application for Analog Output Stage
The signal level of the DAC current output pins (IOUTL+, IOUTL–, IOUTR+, and IOUTR–) is ±2.48 mAp-p at 0 dB (full
scale). The voltage output of the I/V converter is given by the following equation:
V
OUT = ±2.48 mAp-p × RF
Here, RF is the feedback resistor in the I/V (current-to-voltage) conversion circuit, R11, R12, R21, and R22 in the
typical application circuit, Figure 40. The common level of the I/V conversion circuit must be the same as the
common level of DAC IOUT that is given by the VCOM2 reference voltage, 2.5 V dc. The non-inverting inputs of
the operational amplifiers shown in the I/V circuits are connected to VCOM2 to provide the common bias voltage.
The OPA627BP/BM, or 5534 type operational amplifier, is recommended for the I/V conversion circuit to obtain
the specified audio performance. Dynamic performance, such as gain bandwidth, settling time, and slew rate of
the operational amplifiers creates the audio dynamic performance of the I/V section. The input noise
specification of the operational amplifiers should be considered to obtain 120-dB S/N ratio.
31
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