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ML145503EP Arkusz danych(PDF) 11 Page - LANSDALE Semiconductor Inc.

Numer części ML145503EP
Szczegółowy opis  PCM Codec-Filter Mono-Circuit
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Producent  LANSDALE [LANSDALE Semiconductor Inc.]
Strona internetowa  http://www.lansdale.com
Logo LANSDALE - LANSDALE Semiconductor Inc.

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ML145502, ML145503, ML145505
LANSDALE Semiconductor, Inc.
RxO, RxO
Receive Analog Outputs
These two complimentary outputs are generated from the out-
put of the receive filter. They are equal in magnitude and out of
phase. The maximum signal output of each is equal to the maxi-
mum peak–to–peak signal described with the reference. If a
3.15 V reference is used with RSI tied to VAG and a + 3 dBm0
sine wave is decoded, the RxO output will be a 6.3 V
peak–to–peak signal. RxO will also have an inverted signal out-
put of 6.3 V peak–to–peak. External loads may be connected
from RxO to RxO for a 6 dB push–pull signal gain or from
either RxO or RxO to VAG. With a 3.15 V reference each output
will drive 600
Ω to + 9 dBm. With RSI tied to VDD, each out-
put will drive 900
Ω to + 9 dBm.
RxG
Receive Output Gain Adjust (ML145502 Only)
The purpose of the RxG pin is to allow external gain adjust-
ment for the RxO pin. If RxG is left open, then the output signal
at RxO will be inverted and output at RxO. Thus the push–pull
gain to a load from RxO to RxO is two times the output level at
RxO. If external resistors are applied from RxO to RxG (RI)
and from RxG to RxO (RG), the gain of RxO can be set differ-
ently from inverting unity. These resistors should be in the range
of 10 k
Ω. The RxO output level is unchanged by the resistors
and the RxO gain is approximately equal to minus RG/RI. The
actual gain is determined by taking into account the internal
resistors which will be in parallel to these external resistors. The
internal resistors have a large tolerance, but they match each
other very closely. This matching tends to minimize the effects
of their tolerance on external gain configurations. The circuit for
RxG and RxO is shown in the block diagram.
Txl
Transmit Analog Input
TxI is the input to the transmit filter. It is also the output of
the transmit gain amplifiers of the ML145502/03/05. The TxI
input has an internal gain of 1.0, such that a +3 dBm0 signal at
TxI corresponds to the peak converter reference voltage as
described in the Vref and RSI pin descriptions. For 3.15 V refer-
ence, the + 3 dBm0 input should be 6.3 V peak–to–peak.
+Tx/–Tx
Positive Tx Amplifier Input
Negative Tx Amplifier Input
The Txl pin is the input to the transmit band–pass filter. If
+Tx or –Tx is available, then there is an internal amplifier pre-
ceding the filter whose pins are +Tx, –Tx, and TxI. These pins
allow access to the amplifier terminals to tailor the input gain
with external resistors. The resistors should be in the range of
10 k
Ω. If +Tx is not available, it is internally tied to VAG. If
–Tx and +Tx are not available, the TxI is a unity gain
high–impedance input.
POWER SUPPLIES
VDD
Most Positive Power Supply
VDD is typically 5 to 12 V.
VSS
Most Negative Power Supply
VSS is typically 10 to 12 V negative of VDD.
For a ±5 V dual–supply system, the typical power supply con-
figuration is VDD = + 5 V, VSS = – 5 V, VLS = 0 V (digital
ground accommodating TTL logic levels), and VAG = 0 V being
tied to system analog ground.
For single–supply applications, typical power supply configu-
rations include:
VDD = 10 V to 12 V
VSS = 0 V
VAG generates a mid supply voltage for referencing all analog
signals.
VLS controls the logic levels. This pin should be connected to
VDD for CMOS logic levels from VSS to VDD. This pin should
be connected to digital ground for true TTL logic levels refer-
enced to VLS.
TESTING CONSIDERATIONS (ML145502 ONLY)
An analog test mode is activated by connecting MSI and CCI
to 128 kHz. In this mode, the input of the A/D (the output of the
Tx filter) is available at the PDI pin. This input is direct coupled
to the A/D side of the codec. The A/D is a differential design.
This results in the gain of this input being effectively attenuated
by half. If monitored with a high–impedance buffer, the output
of the Tx low–pass filter can also be measured at the PDI pin.
This test mode allows independent evaluation of the transmit
low–pass filter and A/D side of the codec. The transmit and
receive channels of these devices are tested with the codec–filter
fully functional.
www.lansdale.com
Page 11 of 26
Issue A


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