CS61535A Cirrus Logic, Inc., CS61535A Datasheet - Page 36

• Manufacturer Part Number: CS61535A
• Description: T1-E1 Line Interface Unit for PCM applications
• Manufacturer: Cirrus Logic, Inc.

POWER SUPPLY
As shown on the evaluation board schematic in
Figure 1, power is supplied to the evaluation
board from an external +5 Volt supply connected
to the two binding posts labeled +5V and GND.
Transient suppressor D10 protects the compo-
nents on the board from over-voltage damage and
reversed supply connections. The recommended
power supply decoupling is provided by C1, C2
and C3. Ceramic capacitor C1 and electrolytic ca-
pacitor C2 are used to decouple RV+ to RGND.
Capacitor C3 decouples TV+ to TGND. The TV+
and RV+ power supply traces are connected at the
device socket U1. A ground plane on the compo-
nent side of the evaluation board insures optimum
performance.
BOARD CONFIGURATION
Pins on line interface device U1 with more than
one pin name have different functions depending
on the operating mode selected. Pin names not
enclosed in parenthesis or square brackets de-
scribe the Hardware mode pin function. Pin
names enclosed in parenthesis describe the Ex-
tended Hardware mode pin function. Pin names
enclosed in square brackets describe the Host
mode pin function.
36
JP2, JP6, JP7
JUMPER
JP1
JP3
JP4
JP5
JP8
POSITION
OUT
OUT
A-A
B-B
C-C
D-D
E-E
F-F
IN
IN
-
Host operating mode.
Connector for external processor in Host operating mode.
Extended Hardware operating mode.
Hardware or Host operating modes.
Hardware or Extended Hardware operating modes.
Connects the ACLKI BNC input to pin 1 of device.
Grounds the ACLKI BNC input through 51
Transmit line connection for all applications except those listed for "F-F" on the next line.
75
Shorts resistor R2 for all applications except those listed for "OUT" on the next line.
Inserts resistor R2 for 75
Table 1. Evaluation Board Jumper Settings
coax E1 applications using the Schott 12932/12532 or PE-65389/65566 at transformer T1.
coax E1 applications using the CS61534, 35, 58, 74, or 77.
Table 1 explains how to configure the evaluation
board jumpers depending on the device installed
and the desired operating mode. Mode selection
is accomplished with slide switch SW1 and jump-
ers JP2, JP6, and JP7. The CS61535A,
CS61574A, CS61575, CS61577, CS61304A, and
CS61305A support the Hardware, Extended
Hardware, and Host operating modes. The
CS61534, CS61535, and CS61574 support the
Hardware and Host operating modes. The
CS6158 and CS6158A only support the Hardware
operating mode.
Hardware Mode
In the Hardware operating mode, the line inter-
face is configured using DIP switch S2. The digi-
tal control inputs to the device selected by S2 in-
clude: transmit all ones (TAOS), local loopback
(LLOOP), remote loopback (RLOOP), and trans-
mit line length selection (LEN2,LEN1,LEN0).
Closing a DIP switch on S2 towards the label sets
the device control pin of the same name to logic 1
(+5 Volts). Note that S2 switch positions TCODE
and RCODE have no function in Hardware mode.
In addition, the host processor interface connector
JP1 should not be used in the Hardware mode.
Two LED status indicators are provided in Hard-
ware mode. The LED labeled DPM (AIS) illumi-
nates when the line interface asserts the Driver
FUNCTION SELECTED
LINE INTERFACE EVALUATION BOARD
resistor R1.
DS40DB3