PCM2705CDBR

Manufacturer Part NumberPCM2705CDBR
DescriptionIC DAC 16BIT STEREO W/USB 28SSOP
ManufacturerTexas Instruments
Series-
TypeDAC, USB
PCM2705CDBR datasheets

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Specifications of PCM2705CDBR

ApplicationsUSB AudioMounting Type*
Package / Case*Lead Free Status / Rohs StatusLead free / RoHS Compliant
Other names296-29562-2  
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Clock and Reset
For both USB and audio functions, the PCM2704C/5C/6C/7C require a 12-MHz (±500 ppm) clock that can be
generated by the onboard oscillator using a 12-MHz crystal resonator. The 12-MHz crystal resonator must be
connected to the XTI pin (pin 28 for the PCM2704C/5C, pin 12 for the PCM2706C/7C) and the XTO pin (pin 1 for
the PCM2704C/5C, pin 13 for the PCM2706C/7C) with one large (1-MΩ) resistor and two small capacitors; the
capacitance of these components depends on the specified load capacitance of the crystal resonator. An
external clock can be supplied from XTI (pin 28 for the PCM2704C/5C, pin 12 for the PCM2706C/7C). If an
external clock is supplied, XTO (pin 1 for the PCM2704C/5C, pin 13 for the PCM2706C/7C) must be left open.
No clock disabling pin is provided; therefore, it is not recommended to use the external clock supply. SSPND (pin
27 for the PCM2704C/5C, pin 11 for the PCM2706C/7C) cannot use clock disabling.
The PCM2704C/5C/6C/7C have an internal power-on reset circuit, and it works automatically when V
the PCM2704C/5C, pin 21 for the PCM2706C/7C) exceeds 2-V typical (1.6 V to 2.4 V), which is equivalent to
V
(pin 10 for the PCM2704C/5C, pin 24 for the PCM2706C/7C) exceeding 3-V typical for bus-powered
BUS
applications. Approximately 700 μs is required until an internal reset release occurs.
Operation Mode Selection
The PCM2704C/5C/6C/7C have the following mode-select pins.
Power Configuration Select/Host Detection
PSEL (pin 4 for the PCM2704C/5C, pin 16 for the PCM2706C/7C) is dedicated to selecting the power source.
This selection affects the configuration descriptor. While in bus-powered operation, the maximum power
consumption from V
is determined by the HOST pin (pin 21 for the PCM2704C/5C, pin 3 for the
BUS
PCM2706C/7C). For self-powered operation, the HOST pin must be connected to V
pulldown resistor to detect attach and detach. (To avoid excessive suspend current, the pulldown should be a
high-value resistor.)
Table 3
summarizes the power configuration select options.
PSEL
0
1
HOST
0
1
Function Select (PCM2706C/7C Only)
FSEL (pin 9) determines the function of the FUNC0–FUNC3 pins (pins 4, 5, 18, and 19) and DOUT (pin 17).
2
When the I
S interface is required, FSEL must be low. Otherwise, FSEL must be high.
functionality of the FUNC0-FUNC3 pins, based on the FSEL pin.
FSEL
DOUT
2
0
Data out (I
S)
1
S/PDIF data
Next track (HID)
(1) Valid on the PCM2706C only; no function assigned on the PCM2707C.
Copyright © 2011, Texas Instruments Incorporated
Product Folder Link(s):
DETAILED DESCRIPTION
Table 3. Power Configuration Select
DESCRIPTION
Self-powered
Bus-powered
DESCRIPTION
Detached from USB (self-powered)/100 mA (bus-powered)
Attached to USB (self-powered)/500 mA (bus-powered)
Table 4. Function Select
FUNC0
FUNC1
2
2
LRCK (I
S)
BCK (I
S)
(1)
(1)
Previous track (HID)
PCM2704C PCM2705C PCM2706C PCM2707C
PCM2704C, PCM2705C
PCM2706C, PCM2707C
SBFS036 – AUGUST 2011
(pin 7 for
DD
of the USB bus with a
BUS
Table 4
lists the
FUNC2
FUNC3
2
2
SYSCK (I
S)
Data in (I
S)
(1)
(1)
Stop (HID)
Play/pause (HID)
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15

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