ESS Technology, Inc.
SAM0315-061102 1
ESS Technology, Inc.
ES2828
Modem Analog Front End
Product Brief
DESCRIPTION
The ES2828 TeleDrive
modem chip is an analog-front-end (AFE)
chip designed to work with ESS Technology modem DSPs and
audio-accelerator chips, as well as with system core-logic
chipsets, to offer the most versatile solution for modems only or
for complete audio-modem combinations. With the addition of an
external transformer DAA, the ES2828 modem AFE chip
provides a very low-cost, complete host-based modem solution.
The ES2828 modem provides high performance, high
connectivity, and high throughput. It integrates a low-pass
continuous anti-aliasing filter, a 16-bit resolution ADC, a 16-bit
DAC, a low-pass output-reconstruction filter, and an AC-Link
interface for core-logic chipset-based modem solution.
The ES2828 includes ADC and DAC signal processing channels
and the associated data controls for each channel. The two
channels operate synchronously, so that data reception at the
ADC channel and data transmission from the DAC channel occur
during the same time interval.
The ES2828 modem solution is capable of send/receive data
and fax, supports telephone answering machine (TAM), and is
capable of data/fax/voice call discrimination. With its built-in
ACPI and D3
cold
wake-on-ring support, the ES2828 is an ideal
modem solution for notebooks and battery-operated devices.
The ES2828 modem solution meets all the requirements for
Microsoft WHQL certification, as well as V.250, V.251, and V.253
commands
The ES2828 is available in an industry-standard 48-pin low-
profile quad flat pack (LQFP) package.
FEATURES
V.90/V.92 analog data/fax/TAM modem
Data Mode capabilities:
--
V.90/V.92: 56 kbps
--
ITU-T V.34: 33.6 kbps and fallbacks.
Fax mode capabilities:
--
ITU-T V.17, V.29, V.27ter, and V.21ch2
--
Group 3 (TIA/EIA-578 Class 1 and Class 2).
Requires minimum 166-MHz Pentium with MMX technology.
PC2001-compliant.
V.80 (H.324 software-stack-compatible).
MC`97-compliant modem codec supporting AC-Link compatible
with Rev 2.1 of the IntelTM AC`97 specification.
Sigma-delta modulation codec.
Software reset through command register.
Caller ID.
Data/fax/voice call discrimination.
Worldwide homologation.
16-bit ADC and DAC with built-in anti-aliasing and
reconstruction filters.
Compliance with ACPI 2.0 and PCI Power Management
Interface 1.0, supporting the D3
cold
wake-on-ring.
Supports Microsoft Windows
Unimodem V and TAPI
specifications.
Supports Microsoft Windows
98/SE/ME/2000/XP.
Supports Windows
NT 4.0.
BLOCK DIAGRAMS
Figure 1 shows the ES2828 block diagrams.
Figure 1 ES2828 Block Diagrams
ES1921 AC`97
Audio Codec
AC-Link #2
HOST PCI
BUS
INTERFACE
DAA
CORE-
CHIPSET
CORE-LOGIC CHIPSET-BASED MODEM DESIGN
ESS AUDIO MODEM COMBO DESIGN
LOGIC
Audio Accelerator
AC-Link #1
ES2828
Modem AFE
ES1921 AC`97
Audio Codec
ES2828
Modem AFE
24.576 MHz
AC-Link
ES2898
TeleDrive
ES2828
Modem AFE
DAA
18.816 MHz
HOST
4
CHI BUS
ESS DSP MODEM DESIGN
(CHI BUS MODE)
ES1980
PCI
BUS
INTERFACE
DAA
2
SAM0315-061102
ESS Technology, Inc.
ES2828 PRODUCT BRIEF
PINOUT
Figure 2 shows the ES2828 pinout diagram.
Figure 2 ES2828 Pinout Diagram
ES2828 PIN DESCRIPTION
Table 1 lists the ES2828 pin descriptions.
ES2828S
1
V A U X
R I N G # / G P I O _ 0
C A L L I D / G P I O _ 1
G P I O _ 2
L C S / G P I O _ 3
G P I O _ 4
G P I O _ 5
D G N D
O F F H K / G P I O _ 6
G P I O _ 7
G P I O _ 8
G P I O _ 9
GPI
O
_A
ACLI
NK/
G
P
I
O_B
DV
DD
AGND
AGND
AGND
AUX
+
AU
X
RXIN
+
RXIN
AV
DD
VCM
SDATA
_
I
N
ID
0
PWDN#
ID
1
RS
T#
XTA
L
I
XTA
L
O
DV
DD
CK
O
FS/
S
YNC
S
C
/B
IT
CLK
SO
S I / S D A T A _ O U T
D V D D
C T S T
D G N D
H C T
V C M X
A G N D
T X
T X +
V R B P
V R E F
V C B P
1 3
2 5
3 7
2
3
4
5
6
7
8
9
10
11
12
24
23
22
21
20
19
18
17
16
15
14
36
35 34
33 32
31
30
29
27 26
28
38
39
40
41
42
43
44
45
46
47
48
48-PIN LQFP
Table 1 ES2828 Pin Descriptions
Names
Pin Numbers
I/O
Definitions
GPIO_A
1
I
General-purpose I/O.
ACLINK/GPIO_B
2
I/O
Bus strap pin. Default is CHI Bus (internal pulldown). To implement AC-Link mode,
use a 10k
pullup resistor.
DVDD
3, 23, 29
P
3.3V digital power.
ESS Technology, Inc.
SAM0315-061102
3
ES2828 PRODUCT BRIEF
AGND
4:6, 18
I
Analog ground.
AUX+
7
I
Codec analog auxiliary differential positive input. The DC level is VCM, and the full-
scale input is either 2.2Vp-p 5% or 1.1Vp-p5%, depending on the gain setting.
AUX-
8
I
Codec analog auxiliary differential negative input. The DC level is VCM, and the full-
scale input is either 2.2Vp-p 5% or 1.1Vp-p5%, depending on the gain setting.
RXIN+
9
I
Codec analog differential positive input. The DC level is VCM, and the full-scale input
is either 2.2Vp-p 5% or 1.1Vp-p5%, depending on the gain setting.
RXIN-
10
I
Codec analog differential negative input. The DC level is VCM, and the full-scale
input is either 2.2Vp-p 5% or 1.1Vp-p5%, depending on the gain setting.
AVDD
11
I
Analog 5.0V supply.
VCM
12
O
Common mode voltage bypass. Has a range of 2.16V5%. Bypass to VCBP with
0.1-
F ceramic chip capacitor parallel with 10-F tantalum capacitor.
VCBP
13
I
Ground for VCM.
VREF
14
O
Voltage reference bypass. Has a range of 1.2356V5%. Bypass to VRBP with 0.1-
F
ceramic chip capacitor parallel with 10-
F tantalum capacitor.
VRBP
15
I
Ground for VREF.
TX+
16
O
Codec positive analog output. The DC level is VCM, and the full-scale AC output is
either 2.8Vp-p5% or 1.4V p-p5%, depending on the gain setting. The maximum
loading is 1 k
in parallel with 20 pF for modem applications. For audio applications
with low-impedance load, the maximum distortion-free (THD <60 db) current is
10 mA rms.
TX-
17
O
Codec negative analog output. The DC level is VCM, and the full-scale AC output is
either 2.8Vp-p5% or 1.4Vp-p5%, depending on the gain setting. The maximum
loading is 1 k
in parallel with 20 pF for modem applications. For audio applications
with low-impedance load, the maximum distortion-free (THD <60 db) current is
10 mA rms.
VCMX
19
O
Codec common mode reference voltage output. 2.16V5%, maximum, current
500
A, maximum, capacitive load 20 pF.
HCT
20
I
Codec digital input mode control. The CHI bus interface uses a 4.7 k
pulldown
resistor. The AC-Link interface uses a 10 k
pullup resistor.
DGND
21, 44
--
Digital ground.
CTST
22
I
Codec sigma delta modulator test port output enable.
SI/SDATA_OUT
24
I
Serial port input (default). In AC-Link mode, is AC`97 serial data input pin. To use in
CHI bus mode, use a 4.7 k
pulldown resistor.
SO
25
O
Serial port output without V
AUX
support.
SC/BITCLK
26
I/O, O Serial port clock output. While input must be TTL-compatible, should be able to
handle 3.3V input. In AC-Link mode, is 12.288 MHz serial data clock BITCLK output
or input for secondary codec, depending on codec configuration.
FS/SYNC
27
O
Serial port frame sync. In AC-Link mode, is 48-kHz fixed-rate sample sync.
CKO
28
O
3.3V clock output.
XTALO
30
O
Crystal oscillator output.
XTALI
31
I
Crystal oscillator input.
RST#
32
I
Reset.
ID1
33
I
Modem AFE configuration strap 1. When pulled down internally with ID0 (pin 35),
helps set primary and secondary modem codec ID configuration.
Table 1 ES2828 Pin Descriptions (Continued)
Names
Pin Numbers
I/O
Definitions
4
2001 ESS Technology, Inc. All rights reserved.
SAM0315-061102
ES2828 PRODUCT BRIEF
No part of this publication may be reproduced, stored in a
retrieval system, transmitted, or translated in any form or
by any means, electronic, mechanical, manual, optical, or
otherwise, without the prior written permission of ESS
Technology, Inc.
ESS Technology, Inc. makes no representations or
warranties regarding the content of this document.
All specifications are subject to change without prior
notice.
ESS Technology, Inc. assumes no responsibility for any
errors contained herein.
TeleDrive is a registered trademark of ESS Technology, Inc.
(P) U.S. patents pending.
All other trademarks are owned by their respective
holders and are used for identification purposes only.
ESS Technology, Inc.
48401 Fremont Blvd.
Fremont, CA 94538
Tel: (510) 492-1088
Fax: (510) 492-1898
ORDERING INFORMATION
PWDN#
34
I
Power-down (active-low) (CHI Bus mode only).
ID0
35
I
Modem AFE configuration strap 0. When pulled down internally with ID1 (pin 33),
helps set primary and secondary modem codec ID configuration.
SDATA_IN
36
O
Serial port output with V
AUX
support.
V
AUX
37
I
Auxilliary power to device during implementation of the D3
cold
state required by PCI
power management interface specification.
RING#/GPIO_0
38
I/O
Ring in detection (default). Used for ring detect input during the D3
cold
state to drive
the device back to its default power-up state. In AC-Link mode, is GPIO_0 input/out-
put.
CALLID/GPIO_1
39
I,
I/O
Caller ID (default output). Otherwise, is GPIO_1 input/output.
GPIO_2
40
I/O
Voice relay control (output).
LCS/GPIO_3
41
I,
I/O
Loop current sense (default input). Otherwise, is GPIO_3 input/output.
GPIO_4
42
I/O
Ring sensitivity (RISEN#) Control. (International DAA) (output).
GPIO_5
43
I/O
Pulse dialing control (output).
OFFHK/GPIO_6
45
O,
I/O
Off-hook relay control (default output). Otherwise, is GPIO_6 input/output.
GPIO_7
46
I/O
Current limit control (output).
GPIO_8
47
I/O
Complex impedance mach control (output).
GPIO_9
48
I/O
General-purpose input/output.
Table 1 ES2828 Pin Descriptions (Continued)
Names
Pin Numbers
I/O
Definitions
Part Number
Description
Package
ES2828S
Modem Analog Front End
48-pin LQFP
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