ALESS AL1101 Datasheet

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General Description

The AL1101 stereo ADC is a high
performance 24-bit analog to digital audio
converter. Dynamic range is 107dB (A­weighted). The sensible pinout and easy
user interface are unprecedented. The
part has an internal high quality phase­locked loop that eliminates the need for
external high frequency clocks.

INL+

1

Features

G

24 bit conversion

G

107dB dynamic range (A-wt)

G

.002% THD (input=-1dBFS)

G

64X oversampling, 5thorder 1 bit ∆-Σ
modulator

G

64:1 linear phase digital decimation
filter

G

sample rate variable from 24kHz to
55kHz

G

digital high-pass filter

G

total power consumption 110mW
(Fs=48kHz)

G

internal PLL derives all necessary
timing signals from one external Fs
clock

G

serial output bit-rate selectable 32/24
bits/frame

G

full scale differential input =+/-4V
([IN+]-[IN-])

G

5V operation

6
1

INR+

INL-

AGND

REF+

REF-

VD

DGND

8

FORMAT

9

16 pin SOIC

150 mils wide

Alesis Semiconductor

DS1101-0702 12555 Jefferson Blvd., Suite 285

Los Angeles, CA 90066

Phone [phone] Fax [phone] www.alesis-semi.com

INR­MID
VA
AGND
DGND
DOUT
WDCLK

Pin Description

Pin # Name Pin Type Description

1 INL+ INPUT positive analog input, left channel
2 INL- INPUT negative analog input, left channel
3 AGND GND analog ground
4
5 REF- GND negative reference, connect to GND
6
7 DGND GND digital ground
8 FORMAT INPUT format select, 0=32 bits/frame, 1=24bits/frame

9 WDCLK INPUT sample frequency wordclock, 24kHz<Fs<55kHz
10 DOUT OUTPUT serial data output
11 DGND GND digital ground
12 AGND GND analog ground
13
14
15 INR- INPUT negative analog input, right channel
16 INR+ INPUT positive analog input, right channel

REF+ PWR

VD PWR

VA PWR
MID OUTPUT

16

BC

1

A

7° nom

pos reference, 5V thru 1K, connect .1µ bypass to REF-

digital supply, 5V, connect .1µ bypass cap to GND

analog supply, 5V, connect .1µ bypass cap to GND
mid reference, connect .1µ bypass cap to GND

Dimensions (Typical)

Inches Millimeters

A .389” 9.88
B .154” 3.91
C .236” 5.99
D .100” 2.50
E .008” 0.20
F .025” 0.64

9

8

G .050” 1.27
H .017” 0.42

J .011” 0.27
K .170” 4.32

L .033” 0.83

Notes:

1) Dimension “A” does not
include mold flash,

K

protrusions or gate burrs.

D

E

G

F

DS1101-0702 12555 Jefferson Blvd., Suite 285

Phone [phone] Fax [phone] www.alesis-semi.com

H

4° nom

J

Alesis Semiconductor

Los Angeles, CA 90066

L

-2-

Analog Characteristics

(Ta=25aC, VA=VD=V
20kHz, unless otherwise specified)

Parameter Comments Min Typ Max Units

Dynamic Range input=-60dBFS (A-wt) 107 dB
THD+N input=-1dBFS -95 dB

Crosstalk input=-1dBFS -130 dB
Input Voltage [IN+]-[IN-] fullscale +/-4.0 +/-4.2 V

Input impedance differential 160k Ohm
Power Supply Current analog (IA)16mA

REF current I
Power Consumption 110 mW
Gain Error REF+ held at 5V +/-.34 %
PSRR REF+ held at 5V 70 dB

Note 1: Full scale input scales linearly with REF potential ([REF+]-[REF-]).
Note 2: REF current scales linearly with Fs.

=5V, Fs=48kHz, input freq=1kHz, measurement bandwidth=20Hz-

REF

input=-20dBFS -84 dB
input=-60dBFS -44 dB

interchannel match .01 dB
common mode dc bias 2.5 V

digital (ID)6mA

REF

2

130

µA

Digital Filter Characteristics

(Ta=25aC, VA=VD=V

Parameter Comments Min Typ Max Units

Passband -3dB bandwidth
Stopband Frequency
Group delay 37.9 1/Fs

Group delay distortion 0
Highpass Filter Fc

Note 1: passband, stopband, and highpass frequencies scale with Fs.
Note 2: passband is compensated for external single-pole 80kHz lowpass filter at

analog inputs (.26dB at 20kHz). Compensation scales with Fs.

DS1101-0702 12555 Jefferson Blvd., Suite 285

Phone [phone] Fax [phone] www.alesis-semi.com

=5V, Fs=48kHz)

REF

Ripple (20Hz-21.7kHz) +/-.025 dB
Attenuation -76 dB

-0.1dB frequency 16.4 Hz

1,2

1

1

Alesis Semiconductor

Los Angeles, CA 90066

-3-

2.5 21.77K Hz

26.23k Hz

µs

2.5 Hz