PCM1730ESLASH2K datasheet(13/24 Pages) TI

13 / 24 page

PCM1730

SLES021 – NOVEMBER 2001

www.ti.com

analog outputs

PCM1730E

VCC2

IOUTR+

VCC1

VCOM3

IREF

VCOM2

IOUTR–

MUTE

AGND1

VCOM1

R11

–

VCC3

AGND2

IOUTL–

IOUTL+

C13

–

R12

C14

R13

R14

C15

–

R16

R17

R15

C17

VOUT

L-Channel

16 k

Ω

µF

R21

–

C23

–

R22

C24

R23

R24

C25

–

R26

R27

R25

C27

VOUT

R-Channel

C16

R18

C26

R28

5 V

µF

0.1

µF

C11

C12

C21

C22

NOTE: Example R/C values for fC 45 kHz

R11–R18, R21–R28: 620 Ω, C11, C12, C21, C22: not populated, C13, C14, C23, C24: 5600 pF, C15, C25: 8200 pF, C16, C17, C26,

C27: 1800 pF

Figure 7. Typical Application for Analog Output Stage

analog output level and I/V converter

The signal level of DAC current output pins (IOUTL+, IOUTL–, IOUTR+, IOUTR–) is ±2.48 mAp-p at 0 dB (full scale).

The voltage output of the I/V converter is given by following equation:

VOUT = ±2.48 mAp–p × Rf

Here, Rf is the feedback resistor in the I/V conversion circuit, R11, R12, R21, R22 on typical application circuit.

The common level of the I/V conversion circuit must be same as common level of DAC IOUT which is given by

VCOM2 reference voltage, which is 2.48 V dc typically. The noninverting inputs of the op amps shown in the I/V

circuits are connected to VCOM2 to provide the common bias voltage.

PCM1730E/2K Datasheet(PDF) 13 Page - Texas Instruments

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