CRD4299-1 datasheet(7/30 Pages) CIRRUS

Part #	CRD4299-1

Description	AC 97 AMR Reference Design

Download	30 Pages

Scroll/Zoom	100%

Manufacturer	CIRRUS [Cirrus Logic]

Direct Link	http://www.cirrus.com

Logo

7 / 30 page

CRD4299-1 AMR

DS319RD1A1

7

down to a clean +5 V analog supply. Two packag-

ing options are supported, where U5 is an SO8 sur-

face mount package and U4 is a TO-92 pin-in-hole

package. The -12 V power pin is decoupled

through C73/C74, and supplies power to the head-

phone circuit.

3.4 Figure 14: CS4299 AC ‘97 Audio Codec

For the best audio performance, the analog voltage

regulator, an MC78L05, is located near the

CS4299. A 10 µF electrolytic capacitor should be

added next to pins 25 and 26 if the capacitor con-

nected to the output of the power regulator is locat-

ed far away from the CS4299. All filtering

capacitors of audio signals are NPO-type to ensure

minimal added distortion. Two footprints are pro-

vided for the crystal: a CA-301 pin-in-hole foot-

print, Y1, for miniature crystal; and a short height

HC-49S package, Y2. R47 is a termination resistor

in the serial AC-link between the CS4299 and the

AMR bus.

3.5 Figure 15: Analog Inputs

The inputs for AUX, VIDEO, CD, and LINE are

passed through voltage dividers that reduce the lev-

els by 6 dB to allow connection of line level sourc-

es up to 2 Vrms. The 220 pF capacitors are

provided on Line_In, Mic_In, CD_In, Aux_In,

Video_In, and Internal Modem connection for

EMC suppression. These may be removed if EMC

testing determines they are not required. 1 µF AC-

coupling capacitors are used on the Line_In,

Mic_In, CD_In, Aux_In, Video_In, and Internal

Modem circuit to minimize the low frequency roll-

off. The internal CD audio connection utilizes a

pseudo-differential interface with CD_GND as the

common return path for both the left and right

channels. Therefore, the input impedance of this

block is half of that of the other inputs.

The modem connection is both a mono input and

output. The output is fed from the CS4299’s

MONO_OUT pin through a divider made of

R22/23. The divider ratio is preset to 0 dB for an

output voltage of 1 Vrms. If a lower output voltage

is desired, the resistors can be replaced with appro-

priate values, as long as the total load on the output

is kept greater than 10 k

Ω. The input is not divided

to accommodate line level sources up to 1 Vrms.

3.6 Figure 16: Audio Outputs

The line out is driven directly by the CS4299. The

headphone out amplifier, a Motorola MC1458, is

capable of driving stereo headphones with imped-

ances greater than 32

Ω or powered speakers.

R37/38 are added for short-circuit protection. An

optical S/PDIF (IEC 958 consumer) output is also

supported.

3.7 Figure 17: Microphone Pre-amp and

Bias

A Motorola MC33078D low noise dual op-amp

provides an +18 dB gain stage for the microphone

and buffers the phantom power supply for the mic.

The phantom power is derived from the +5 V ana-

log supply and buffered by U1A to provide a max-

imum of 4.2 V with no load and a minimum of

2.0 V under a 0.8 mA load on the ring. Hardware

rolloffs were implemented at 60 kHz and 15 kHz as

recommended by the PC 99 System Design Guide,

Chapter 17, Audio Components [5].

Similar Part No. - CRD4299-1

Manufacturer	Part #	Datasheet	Description
Cirrus Logic	CRD4202-1	932Kb / 24P	AC 97 Six Channel CNR Audio Reference Design
	CRD4202-2	870Kb / 24P	AC 97 Six Channel CNR Audio Reference Design with PLL
	CRD4205-1	806Kb / 24P	Notebook Audio Docking Station Example
	CRD4205-2	451Kb / 18P	PC Audio Docking Station Companion Board
	CRD42528	1Mb / 50P	Reference Design for the

More results

Similar Description - CRD4299-1

Manufacturer	Part #	Datasheet	Description
Cirrus Logic	CRD4202-1	932Kb / 24P	AC 97 Six Channel CNR Audio Reference Design
Cirrus Logic	CRD4202-2	870Kb / 24P	AC 97 Six Channel CNR Audio Reference Design with PLL
NXP Semiconductors	UM10466	1Mb / 18P	UBA2015P reference design 230 V (AC) Rev. 1.2-14 November 2011
	UM10440	1Mb / 25P	UBA2015AT Reference Design 230 V (AC) Rev. 1.1-3 February 2012
	UM10486	601Kb / 18P	UBA2015P reference design 120 V (AC) Rev. 1.1-8 September 2011
	UM10513	1Mb / 26P	UBA2015AT Reference Design 120 V (AC) Rev. 1.1-31 January 2012
Zoran Corporation	SUPRAHD-640	116Kb / 2P	Reference Design
Analog Devices	AD1888	662Kb / 32P	AC 97 SoundMAX Codec REV. A
	AD1885	292Kb / 27P	AC 97 SoundMAX Codec REV. 0
	AD1887	160Kb / 16P	AC 97 SoundMAX Codec REV. 0

More results

CRD4299-1 Datasheet(PDF) 7 Page - Cirrus Logic

CRD4299-1 Datasheet(HTML) 7 Page - Cirrus Logic

Similar Part No. - CRD4299-1

Similar Description - CRD4299-1

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30

Datasheet Download

Link URL