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PDF PCM4201 Data sheet ( Hoja de datos )
| Número de pieza | PCM4201 | |
| Descripción | Low Power 24-Bit Single Channel Audio Analog-to-Digital Converter | |
| Fabricantes | Burr-Brown Corporation | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de PCM4201 (archivo pdf) en la parte inferior de esta página. Total 21 Páginas | ||
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PCM4201
www.DataSheet4U.com
SBAS342A − DECEMBER 2004 − REVISED MARCH 2005
Low Power, 24-Bit, Single Channel Audio
Analog-to-Digital Converter
FEATURES
D High-Performance Delta-Sigma
Analog-to-Digital Converter
D Differential Voltage Inputs
D Dynamic Performance:
− Dynamic Range (A-Weighted): Up to
112dB
− THD+N: As low as −105dB
D Three Sampling Modes:
− Supports Output Sampling Rates Up to
108kHz
− Choose from Low Power, High-
Performance, or Double Speed Modes
D Audio Serial Port Interface:
− Master or Slave Mode Operation
− 24-Bit Linear PCM Output Data
− Left-Justified/DSP-Compatible Data
Format
D Digital High-Pass Filter for DC Removal:
− Includes a High-Pass Filter Disable Pin
D Power Supplies:
− Requires a +5V Analog Power Supply
− Supports a +1.8V to +3.3V Digital Power
Supply Range
D Low Power Dissipation
− 49mW Typical (Low Power Mode with
VDD = +3.3V)
− 39mW Typical (Low Power Mode with
VDD = +1.8V)
D Power Down Mode
− Less than 50µW total power dissipation
D Available in a small TSSOP-16 Package
APPLICATIONS
D Digital Wireless Microphones
D Battery-Powered Audio Recording and
Processing Equipment
DESCRIPTION
The PCM4201 is designed for digital audio applications
that require a combination of high dynamic range, low
distortion, and low power consumption. The primary
applications for the PCM4201 include digital wireless
microphones and battery-operated audio recording or
processing equipment. The PCM4201 outputs 24-bit
linear PCM audio data at sampling rates up to 108kHz.
Three sampling modes allow the user to trade off power for
performance, dependent upon the intended system
requirements. An on-chip voltage reference reduces the
number of external components needed for operation.
The PCM4201 includes dedicated control pins for
configuration of all programmable functions. The device
requires a +5.0V analog power supply, in addition to a
digital supply operating from +1.8V to +3.3V. The
PCM4201 is available in a small TSSOP-16 package.
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments
semiconductor products and disclaimers thereto appears at the end of this data sheet.
I2S is a registered trademark of Royal Philips Electronics B.V., The Netherlands. All other trademarks are the property of their respective owners.
PRODUCTION DATA information is current as of publication date. Products
conform to specifications per the terms of Texas Instruments standard warranty.
Production processing does not necessarily include testing of all parameters.
Copyright 2004−2005, Texas Instruments Incorporated
www.ti.com
1 page  
PCM4201
www.ti.com
SBAS342A − DECEMBEwR w20w04.D−aRtEaVSIhSeEDetM4AUR.cCoHm2005
ELECTRICAL CHARACTERISTICS (continued)
Unless otherwise specified, all characteristics are measured with TA = +25°C, VCC = +5V, and VDD = +3.3V. System clock frequency is set to
24.576 MHz. Device is operated in Slave mode.
PCM4201
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
DIGITAL HIGH PASS FILTER
Frequency response (−3dB)
POWER SUPPLY
fS/48000
Hz
Supply voltage range
VCC
VDD
Normal speed, low power
+4.75
+1.65
+5.0
+3.3
7
+5.25
+3.6
8.2
V
V
mA
Operating supply current
with VCC = +5V, VDD = +1.8V
ICC Normal speed, high performance
Double speed
Normal speed, low power
13 15 mA
13 16 mA
2 3.2 mA
IDD Normal speed, high performance
Double speed
2.5 4.5 mA
3.5 6.0 mA
Normal speed, low power
7 8.2 mA
Operating supply current
with VCC = +5V, VDD = +3.3V
ICC Normal speed, high performance
Double speed
Normal speed, low power
13 15 mA
13 16 mA
4 6.0 mA
IDD Normal speed, high performance
Double speed
5 8.5 mA
7.5
10.5
mA
Power-Down mode current
with VCC = +5V, VDD = +1.8V or +3.3V
Total power dissipation
with VCC = +5V, VDD = +3.3V
ICC
IDD
Normal speed, low power
Normal speed, high performance
Double speed
5 µA
5 µA
49 61 mW
82 103 mW
90 115 mW
Total power dissipation
with VCC = +5V, VDD = +1.8V
Normal speed, low power
Normal speed, high performance
Double speed
39 47 mW
70 83 mW
72 91 mW
(1) Applies to RATE (pin 5) and S/M (pin 6) inputs.
(2) All typical dynamic performance specifications were measured using an Audio Precision System Two Cascade or Cascade Plus test system and a PCM4201EVM
evaluation module. For Normal Speed operation, the measurement bandwidth is limited using the Audio Precision 22Hz high-pass filter and 20kHz low-pass filter.
For Double Speed mode, the measurement bandwidth is limited using the Audio Precision 22Hz high-pass filter and a user-defined 40kHz low-pass filter (the
fS/2 low pass filter may be utilized with similar results). All A-weighted measurements are made using the Audio Precision A-weighting filter in combination with
the filters previously noted here. Minimum and maximum dynamic performance limits are based upon the capability of the production test solution.
5
5 Page 
PCM4201
www.ti.com
ANALOG INPUTS
The PCM4201 features differential voltage inputs. VIN+
(pin 1) and VIN− (pin 2) provide the noninverting and
inverting inputs, respectively. The full-scale input voltage,
measured differentially across these two pins, is
approximately 5.0VPP. The input impedance is
approximately 15kΩ per input pin.
In applications where the analog inputs can be driven
beyond the analog supply rails of the PCM4201, the input
buffer circuit should incorporate clamping or limiting
circuitry to ensure that the analog inputs are not driven
beyond the absolute maximum input levels for these pins.
Refer to the Absolute Maximum Ratings table of this
datasheet.
VOLTAGE REFERENCE
The PCM4201 includes an on-chip band gap reference for
the delta-sigma modulator, eliminating the need for
external reference circuitry. The reference voltage is set to
+2.5V nominal. The VREF+ (pin 16) and VREF− (pin 15)
outputs provide connections for reference decoupling
capacitors, which are connected between these two pins.
The VREF− output is then connected to analog ground.
Figure 2 shows the recommended decoupling capacitor
connections and values.
PCM4201
16
VREF+
VREF−
15
0.1µF
+
10µF
AGND
Figure 2. Voltage Reference Connections
The voltage reference output is not buffered, and should
not be connected to external circuitry other than the
decoupling capacitors. DC common-mode voltage for the
input buffer circuitry may be set using an external voltage
divider circuit, as shown in the Applications Information
section of this datasheet.
SYSTEM CLOCK
The PCM4201 requires an external system clock, which is
used internally to derive the modulator oversampling and
digital subsystem clocks. The system clock is input at
SBAS342A − DECEMBEwR w20w04.D−aRtEaVSIhSeEDetM4AUR.cCoHm2005
SCKI (pin 12). The acceptable system clock frequency
and duty cycle range are listed in the Electrical
Characteristics table of this datasheet.
The PCM4201 supports specific system clock rates, which
are multiples of the desired output sampling frequency.
The supported system clock rate is also dependent upon
the audio serial port mode. Table 1 and Table 2 specify the
system clock rates required for common output sampling
frequencies for both Slave and Master mode audio
serial-port operation.
Table 1. System Clock Rates for Common Audio
Sampling Frequencies—Slave Mode Operation
SAMPLING
MODE
Normal
Normal
Normal
Double
Double
SAMPLING
FREQUENCY
(kHz)
32
44.1
48
88.2
96
SYSTEM CLOCK
FREQUENCY (MHZ)
SCKI = 256fS
8.192
11.2896
12.288
22.5792
24.576
SCKI = 512fS
16.384
22.5792
24.576
n/a
n/a
Table 2. System Clock Rates for Common Audio
Sampling Frequencies—Master Mode Operation
SAMPLING
MODE
Normal
Normal
Normal
Double
Double
SAMPLING
FREQUENCY
(kHz)
32
44.1
48
88.2
96
SYSTEM CLOCK
FREQUENCY (MHZ)
SCKI = 256fS
N/A
N/A
N/A
22.5792
24.576
SCKI = 512fS
16.384
22.5792
24.576
n/a
n/a
SAMPLING MODES
The PCM4201 supports three sampling modes, allowing the
user to select the most appropriate power/performance
combination for a given application. The following
paragraphs describe the operation and tradeoffs for the three
sampling modes. For all cases, fS is defined as the desired
output sampling rate at the audio serial port interface.
Normal Speed, Low Power mode provides the lowest
overall power dissipation, while supporting sampling rates
up to 54kHz. The modulator oversampling rate is 64fS for
this mode, which results in lower dynamic range and
THD+N when compared to Normal Speed, High
Performance mode. For best dynamic performance and
lowest power consumption when using Low Power mode,
it is recommended to operate the PCM4201 from a +1.8V
digital power supply.
11
11 Page | ||
| Páginas | Total 21 Páginas | |
| PDF Descargar | [ Datasheet PCM4201.PDF ] | |
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