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Application Note 9814
PCM4 Con?guration
J5
J6
J10
J4
JP3
J7
JP9
J8
J9
JP7
J11
J3
HC55185
JP6
JP4
JP8
CODEC
APP CKT
J12
APP CKT
JP5
J13
J2
JP1
JP2
JP11
JP12
JP10
J14
J1
S1
0
S2
0
S3
1
S4
x
S5
1
S6
0
CLOCK GENERATION & MUX
J15
FIGURE 8. PCM4 CONNECTORS AND JUMPERS
Description
The PCM4 con?guration veri?es the AC transmission of the
HC55185 and CODEC. Any piece of test equipment capable
of PCM testing with digital and analog interfaces can be
used in this con?guration.
Power Supply Connections
Power should be applied to the evaluation board using the
primary power cable. Either J5 or J6 may be used. Prior to
applying power, the voltage setting of each supply should be
veri?ed. The power supplies should be turned off while
mating the primary power cable to the evaluation board.
Jumper Settings
All jumper settings are described below.
TABLE 4. PCM4 JUMPER POSITIONS
Clock and Frame Sync
The clock and frame sync signals are driven at connectors
J13 and J12 respectively. The clock input is common to the
MCLK, BCLKT and BCLKR of the CODEC. The frame sync
input is common to the receive and transmit frame syncs,
FSR and FST, of the CODEC. These connections de?ne
synchronous mode of operation.
Digital to Analog
The receive signal path is defined from the CODEC PCM
input to the HC55185 Tip and Ring outputs. The PCM4 tester
is capable of driving digital test signals on the PCM bus and
measuring the resultant signal at Tip and Ring. With this type
of capability, the full receive path can be evaluated. Typical
performance measurements include overall loss, gain
variation versus frequency, gain versus signal level and 2-wire
JUMPER
JP4
JP6
JP7
JP8
DESCRIPTION
Connects the receive output of the CODEC (U6) to
the device receive input VRX. Signal path is AC
coupled.
Connects the device transmit output VTX to the
CODEC amplifier for transhybrid balance. Signal
path is AC coupled.
Connects the receive output of CODEC to
transhybrid amplifier, AC coupled by C1.
Inserting jumper set the CODEC to A-law coding.
Open sets the CODEC to μ -law coding. This must
match PCM test equipment coding scheme for
proper operation.
return loss. In addition fidelity measurements such as idle
channel noise and distortion are also performed.
Analog to Digital
The transmit signal path is de?ned from HC55185 Tip and
Ring interface to the CODEC PCM output. The same tests
performed for the receive path also apply to the transmit
path.
Digital to Digital
The digital to digital path is from the CODEC PCM input to
the CODEC PCM output. This signal path provides a
measure of the transhybrid balance for the line circuit. Most
other AC performance metrics are base on analog to digital
or digital to analog measurements. For proper transhybrid
measurements, verify jumper JP7 is inserted.
4-8
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