TP3054WM National Semiconductor, TP3054WM Datasheet - Page 12
TP3054WM
Manufacturer Part Number
TP3054WM
Description
IC, PCM AUDIO CODEC, 8BIT, 8KHZ, WSOIC16
Manufacturer
National Semiconductor
Datasheet
1.TP3054WMXNOPB.pdf
(16 pages)
Specifications of TP3054WM
Audio Codec Type
PCM
No. Of Adcs
1
No. Of Dacs
1
No. Of Input Channels
1
No. Of Output Channels
1
Adc / Dac Resolution
8bit
Sampling Rate
8kSPS
Ic Interface Type
Serial
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
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Company
Part Number
Manufacturer
Quantity
Price
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Part Number:
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Manufacturer:
NS/国半
Quantity:
20 000
Part Number:
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Quantity:
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Part Number:
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Quantity:
20 000
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Part Number:
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Applications Information
POWER SUPPLIES
While the pins of the TP305X family are well protected
against electrical misuse it is recommended that the stan-
dard CMOS practice be followed ensuring that ground is
connected to the device before any other connections are
made In applications where the printed circuit board may be
plugged into a ‘‘hot’’ socket with power and clocks already
present an extra long ground pin in the connector should
be used
All ground connections to each device should meet at a
common point as close as possible to the GNDA pin This
minimizes the interaction of ground return currents flowing
through a common bus impedance 0 1
pling capacitors should be connected from this common
ground point to V
possible
For best performance the ground point of each CODEC
FILTER on a card should be connected to a common card
ground in star formation rather than via a ground bus
Note See Application Note 370 for further details
CC
and V
BB
as close to the device as
R1
R2
Where N
Where Z
and Z
F supply decou-
and
Also Z
S
e
e
e
OC
Z1
2 Z1 Z2
SC
e
e
Z1
Z2
e
N
N
e
2
2
impedance with open circuit termination
R3
R3
Z
a
b
T-Pad Attenuator
impedance with short circuit termination
POWER OUT
SC
POWER IN
N
-Pad Attenuator
1
1
e
e
2
N
Z1
b
Z
b
OC
Z1 Z2
1
2 Z1 Z2
N
2
12
2
b
N
2
2NS
N
This common ground point should be decoupled to V
V
RECEIVE GAIN ADJUSTMENT
For applications where a TP305X family CODEC filter re-
ceive output must drive a 600
than
justed by inserting a matched T-pad or
Table II lists the required resistor values for 600
tions As these are generally non-standard values the equa-
tions can be used to compute the attenuation of the closest
practical set of resistors It may be necessary to use un-
equal values for the R1 or R4 arms of the attenuators to
achieve a precise attenuation Generally it is tolerable to
allow a small deviation of the input impedance from nominal
while still maintaining a good return loss For example a 30
dB return loss against 600
ance of the attenuator is in the range 282
suming a perfect transformer)
b
2
BB
N
b
N
1
a
2
1
N
with 10 F capacitors
b
g
1
1
2 5V is required the receive gain can be easily ad-
is obtained if the output imped-
TL H 5510 – 5
load but a peak swing lower
-pad at the output
to 319
termina-
CC
(as-
and