TP3054-X Datasheet, PDF (1/16 Pages) National Semiconductor (TI) – Extended Temperature Serial Interface CODEC/Filter COMBO Family

March 2005
TP3054-X, TP3057-X
Extended Temperature Serial Interface CODEC/Filter
COMBO^® Family
General Description
The TP3054, TP3057 family consists of µ-law and A-law
monolithic PCM CODEC/filters utilizing the A/D and D/A
conversion architecture shown in Figure 1, and a serial PCM
interface. The devices are fabricated using National’s ad-
vanced double-poly CMOS process (microCMOS).
The encode portion of each device consists of an input gain
adjust amplifier, an active RC pre-filter which eliminates very
high frequency noise prior to entering a switched-capacitor
band-pass filter that rejects signals below 200 Hz and above
3400 Hz. Also included are auto-zero circuitry and a com-
panding coder which samples the filtered signal and en-
codes it in the companded µ-law or A-law PCM format. The
decode portion of each device consists of an expanding
decoder, which reconstructs the analog signal from the com-
panded µ-law or A-law code, a low-pass filter which corrects
for the sin x/x response of the decoder output and rejects
signals above 3400 Hz followed by a single-ended power
amplifier capable of driving low impedance loads. The de-
vices require two 1.536 MHz, 1.544 MHz or 2.048 MHz
transmit and receive master clocks, which may be asynchro-
nous; transmit and receive bit clocks, which may vary from
64 kHz to 2.048 MHz; and transmit and receive frame sync
pulses. The timing of the frame sync pulses and PCM data is
compatible with both industry standard formats.
Features
n −40˚C to +85˚C operation
n Complete CODEC and filtering system (COMBO)
including:
— Transmit high-pass and low-pass filtering
— Receive low-pass filter with sin x/x correction
— Active RC noise filters
— µ-law or A-law compatible COder and DECoder
— Internal precision voltage reference
— Serial I/O interface
— Internal auto-zero circuitry
n µ-law, 16-pin — TP3054
n A-law, 16-pin — TP3057
n Designed for D3/D4 and CCITT applications
n ±5V operation
n Low operating power — typically 50 mW
n Power-down standby mode — typically 3 mW
n Automatic power-down
n TTL or CMOS compatible digital interfaces
n Maximizes line interface card circuit density
n Dual-In-Line or PCC surface mount packages
n See also AN-370, “Techniques for Designing with
CODEC/Filter COMBO Circuits”
Connection Diagrams
Plastic Chip Carriers
Dual-In-Line Package
Top View
Order Number TP3057V-X
NS Package Number V20A
00867408
COMBO^® and TRI-STATE^® are registered trademarks of National Semiconductor Corporation.
© 2005 National Semiconductor Corporation DS008674
00867401
Top View
Order Number TP3054N-X
NS Package Number N16E
Order Number TP3054WM-X
NS Package Number M16B
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