AK61584 Datasheet, PDF (10/38 Pages) Asahi Kasei Microsystems – Dual Low Power T1/E1 Line Interface

ASAHI KASEI
[AK61584]
OVERVIEW
The AK61584 is a universal line interface for
T1/E1 applications, designed for high-volume cards
where low power, high density and universal op-
eration is required. One board design can support
all T1/E1 short-haul modes. The T1 and E1 modes
can be selected entirely via software.
As shown in Figure 1, the AK61584 provides all
the functions needed for a line interface including a
line driver, a receiver and jitter attenuator.
The line driver generates waveforms compatible
with E1 (ITU-T G.703),T1 short haul (DSX-1).
The driver internally matches the impedance of the
load, providing excellent return loss. The benefit of
the internal impedance matching is a 50 percent
reduction in power consumption compared to im-
plementing return loss with external resistors. With
external resistors a driver has to drive the equiva-
lent of two line loads.
The receiver contains clock and data recovery cir-
cuits.
The jitter attenuator meets AT&T 62411 require-
ments without the use of an external quartz crystal.
The attenuator does require an external reference
clock.
12.352MHz
Clock
Control
VCC
Micro Controller
serial port
Framer
Framer
REFCLK 1XCLK
TCLK1
TPOS1
TNEG1
RCLK1
RPOS1
RNEG1
Clock
TCLK2
TPOS2
TNEG2
RCLK2
RPOS2
RNEG2
IPOL RESET MODECS INT SCLK SDO SDI
0.47uF
Control
TTIP1
470pF
T1
(E1)
1:N
TRING1
Channel 1
RTIP1
R1
0.47uF
T2
Channel 2
R2
1:N
RRING1
0.47uF
TTIP2
T3
TRING2
470pF
(E1)
1:N
RTIP2
R3 0.47uF
T4
R4
1:N
RRING2
Power Supply
Vcc
AV+ AGND
1uF
+
BGREF TGND2 TV+2 TV+1 TGND1 RGND2 RV+2 RV+1 RGND1 DV+ DGND
R3
5kohm
0.1uF
0.1uF
0.1uF
0.1uF
3
0.01uF
0.1uF
+
22uF
transmit
receive
transmit
receive
Vcc
Volts
3.3
Data Rate
MHz
1.544
2.048
REFCLK Frequency MHz
Cable
1XCLK=1
1XCLK=0
ohm
1.544
12.352
100
2.048
16.384
75
120
Figure 7 - Typical Connection Diagram
( Host Mode)
R1-R4
ohm
12.5
21.5
34.4
Transformers
T1-T4
1:2
1:1.32
0185-E-00
-10-
‘98/04