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a

Information furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assumed by Analog Devices for its
use, nor for any infringements of patents or other rights of third parties that
may result from its use. No license is granted by implication or otherwise
under any patent or patent rights of Analog Devices.

⌺-⌬ DAC

ⴞ0.0002 dB 

ⴛ Oversampling Digital Filter

⌺-⌬

PRODUCT OVERVIEW
The AD1955 is a complete, high performance, single-chip, stereo
digital audio playback system. It is comprised of a multibit sigma-
delta modulator, high performance digital interpolation filters,
and continuous-time differential current output DACs. Other
features include an on-chip clickless stereo attenuator and mute
capability, programmed through an SPI compatible serial control
port. The AD1955 is fully compatible with all known DVD audio
formats including 192 kHz as well as 96 kHz sample frequencies
and 24 bits. It is also backward compatible by supporting 50

µs/

15

µs digital de-emphasis intended for “redbook” compact discs,

as well as de-emphasis at 32 kHz and 48 kHz sample rates.

The AD1955 has a very flexible serial data input port that
allows for glueless interconnection to a variety of ADCs, DSPs,
SACD decoders, external digital filters, AES/EBU receivers, and

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CAUTION
ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily
accumulate on the human body and test equipment and can discharge without detection. Although the
AD1955 features proprietary ESD protection circuitry, permanent damage may occur on devices
subjected to high energy electrostatic discharges. Therefore, proper ESD precautions are recommended
to avoid performance degradation or loss of functionality.

DV

DD

to DGND

–0.3

6

V

AV

DD

to AGND

–0.3

6

V

Digital Inputs

DGND – 0.3

DV

DD

+ 0.3

V

Analog Outputs

AGND – 0.3

AV

DD

+ 0.3

V

AGND to DGND

–0.3

+0.3

V

Reference Voltage

(AV

DD

+ 0.3)/2

Soldering

300

°C

10

sec

*Stresses greater than those listed under Absolute Maximum Ratings may cause

permanent damage to the device. This is a stress rating only; functional operation
of the device at these or any other conditions above those indicated in the
operational section of this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect device reliability.

␪

JA

(Thermal Resistance

109.0

°C/W

[Junction-to-Ambient])

␪

JC

(Thermal Resistance

39.0

°C/W

[Junction-to-Case])

AD1955ARS

–40

°C to +85°C

28-Lead SSOP

RS-28

AD1955ARSRL

–40

°C to +85°C

28-Lead SSOP

RS-28 on 13" Reels

EVAL-AD1955EB

Evaluation Board

*RS = Shrink Small Outline Package

8

Advanced Monolithic Systems, Inc.    www.advanced-monolithic.com      Phone (925) 443-0722    Fax (925) 443-0723

•• Three Terminal Adjustable or Fixed Voltages*

•• High Efficiency Linear Regulators

•• Post Regulators for Switching Supplies

•• Output Current of  1A

•• 5V to 3.3V Linear Regulator

•• Operates Down to 1V Dropout

•• Battery Chargers

•• Line Regulation: 0.2% Max.

•• Active SCSI Terminators

•• Load Regulation: 0.4% Max.

•• Power Management for Notebook 

•• SOT-223, TO-252 and SO-8 package available

•• Battery Powered Instrumentation

 The  AMS1117 series of adjustable and fixed voltage regulators are designed to provide 1A output current and to operate
down to 1V input-to-output differential. The dropout voltage of the device is guaranteed maximum 1.3V at maximum output 
current, decreasing at lower load currents.
 On-chip trimming adjusts the reference voltage to 1%. Current limit is also trimmed, minimizing the stress under overload 
conditions on both the regulator and power source circuitry.
The AMS1117 devices are pin compatible with other three-terminal SCSI regulators and are offered in the low profile surface 
mount SOT-223 package, in the 8L SOIC package and in the TO-252 (DPAK) plastic package.

TO-252

SOT-223

8L SOIC

 AMS1117CD

 AMS1117

 AMS1117CS

-40 to 125

° C

 AMS1117CD-1.5

 AMS1117-1.5

 AMS1117CS-1.5

-40 to 125

° C

 AMS1117CD-1.8

 AMS1117-1.8

 AMS1117CS-1.8

-40 to 125

° C

 AMS1117CD-2.5

 AMS1117-2.5

 AMS1117CS-2.5

-40 to 125

° C

 AMS1117CD-2.85  AMS1117-2.85

 AMS1117CS-2.85

-40 to 125

° C

 AMS1117CD-3.3

 AMS1117-3.3

 AMS1117CS-3.3

-40 to 125

° C

 AMS1117CD-5.0

 AMS1117-5.0

 AMS1117CS-5.0

-40 to 125

° C

*For additional available fixed voltages contact factory.

3 PIN FIXED/ADJUSTABLE
VERSION

1- Ground/Adjust
2- V

OUT

3- V

IN

SOT-223 Top View

1

2

3

8L SOIC Top View

1

2

8

4

3

7

5

6

V

OUT

N/C

V

OUT

GND/ADJ

V

OUT

V

OUT

N/C

V

IN

TAB IS

OUTPUT

TO-252 FRONT VIEW

1

2

3

9

DS30366 Rev. 3 - 2

BSS123

·

Low Gate Threshold Voltage

·

Low Input Capacitance

·

Fast Switching Speed

·

Low Input/Output Leakage

·

High Drain-Source Voltage Rating

@ T

A

 = 25

°C unless otherwise specified

Drain-Source Voltage

V

DSS

100

V

Drain-Gate Voltage R

GS

£ 20KW

V

DGR

100

V

Gate-Source Voltage 

Continuous

V

GSS

±20

V

Drain Current (Note 1)

Continuous

                                                                           Pulsed

I

D

I

DM

170
680

mA

Total Power Dissipation (Note 1)

P

d

300

mW

Thermal Resistance, Junction to Ambient (Note 1)

R

qJA

417

°C/W

Operating and Storage Temperature Range

T

j

, T

STG

-55 to +150

°C

·

Case: SOT-23, Molded Plastic

·

Case material - UL Flammability Rating 94V-0

·

Moisture sensitivity:  Level 1 per J-STD-020A

·

Terminals: Solderable per MIL-STD-202,
Method 208

·

Terminal Connections: See Diagram

·

Marking: K23 (See Page 3)

·

Ordering & Date Code Information: See Page 3

·

Weight: 0.008 grams (approx.)

  Note:      1. Part mounted on FR-4 board with recommended pad layout, which can be found on our website
                     at http://www.diodes.com/datasheets/ap02001.pdf.

0.37

0.51

1.20

1.40

2.30

2.50

0.89

1.03

0.45

0.60

1.78

2.05

2.80

3.00

0.013

0.10

0.903

1.10

0.45

0.61

0.085

0.180

a

0

°

8

°

A

E

J

L

TOP VIEW

M

B

C

H

G

D

K

D

G

S

Source

Gate

Drain

10