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Home > Products > Integrated Circuits (ICs) > Interface > CODECS

Texas Instruments TP3057N/NOPB

Name: TP3057N/NOPB
Brand: Texas Instruments
SKU: TP3057N/NOPB
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: TP3057N/NOPB

Manufacturer:: Texas Instruments

Category:: CODECS

Package:: 16-DIP (0.300", 7.62mm)

Datasheet:: TP3057N/NOPB.pdf

Description:: PCM CODEC, A-LAW, 1-FUNC, PDIP16

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Product details

Overview

TP3057N/NOPB from Texas Instruments (formerly National Semiconductor) is an A-law PCM codec/filter combo IC designed for telephony line interface cards. It integrates analog front-end amplification, switched-capacitor bandpass filtering (200–3400 Hz), 8-bit A-law companding ADC/DAC, sin x/x-corrected low-pass reconstruction, and a 600 Ω drive-capable power amplifier - all operating from ±5 V supplies with typical active power of 50 mW. It supports D3/D4 and CCITT G.711 applications in TDM voice systems.

For engineers reviewing the TP3057N/NOPB datasheet, TP3057N/NOPB pinout, TP3057N/NOPB application, or TP3057N/NOPB equivalent, key selection criteria include A-law compliance, 290 ms transmit/180 ms receive group delay, ±2.5 V_PK overload level per G.711, synchronous/asynchronous dual-clock operation, and compatibility with 64 kHz–2.048 MHz bit clocks and 1.536/1.544/2.048 MHz master clocks.

Technical Context

The TP3057N/NOPB implements a complete µ/A-law PCM codec chain: its transmit path uses an external-gain-adjustable op-amp input stage followed by active RC pre-filtering and an eighth-order switched-capacitor bandpass filter clocked at 256 kHz, feeding an A-law successive-approximation ADC. The receive path employs an A-law DAC, fifth-order switched-capacitor low-pass filter with sin x/x correction, and a unity-gain 2nd-order RC post-filter/power amplifier delivering 7.2 dBm into 600 Ω.

Timing supports both short-frame (1-bit-wide FSX/FSR) and long-frame (≥3-bit-wide) sync modes, with frame sync edge-triggered sampling and TRI-STATE DX output enabled on FSX rising edge. Synchronous mode selects MCLKX for both directions via BCLKR/CLKSEL logic; asynchronous mode permits independent MCLKX/MCLKR (1.536/1.544 MHz for TP3054, 2.048 MHz for TP3057), with automatic 193rd-pulse compensation for 1.544 MHz operation.

Key Specifications

Parameter	Value and Actual Design Meaning
A-law encoding	Complies with CCITT G.711 A-law standard; enables interoperability with PSTN and digital switching systems using A-law PCM framing.
Transmit delay	290 ms total (165 ms filter + 125 ms encoding); impacts echo cancellation design and real-time voice latency budgets.
Receive delay	180 ms total (10 ms DAC + 110 ms filter + 62.5 ms half-frame); determines end-to-end talker echo round-trip time.
Overload level	2.492 V_PK (3.14 dBm0); matches G.711 A-law reference level for full-scale signal handling without clipping.
Power consumption	50 mW active, 3 mW standby; enables high-density line card designs with thermal management under 1 W per 20 channels.
Output drive	±2.5 V into 600 Ω (7.2 dBm); directly interfaces legacy analog telephone hybrids and SLICs without external buffering.
Filter bandwidth	200 Hz to 3400 Hz passband; meets ITU-T P.51 and P.52 requirements for narrowband telephony frequency response.

Pinout & Package

Molded Dual-In-Line Package (N16A), 16-pin through-hole, 0.300-inch wide body, 0.100-inch lead pitch.

Pin/Terminal	Circuit Role	Design Meaning
VCC	Positive supply rail	+5 V ±5% analog/digital supply; requires local 0.1 µF decoupling to GNDA.
VBB	Negative supply rail	−5 V ±5% analog supply; separate ground return path required for noise isolation.
GNDA	Analog ground reference	Star-point ground for all analog signals; must be isolated from digital ground except at single point.
VFRO	Receive analog output	Single-ended 600 Ω drive output; delivers ±2.5 V peak into terminated load; connects to hybrid transformer or SLIC.
GSX	Transmit gain-set output	Analog output of transmit input amplifier; used with external resistors to set gain (e.g., 0–20 dB).
VFXIa / VFXIb	Transmit input differential pair	Non-inverting and inverting inputs of programmable-gain op-amp; accepts balanced/unbalanced audio sources.
DR	Receive serial data input	PCM data input latched on falling edge of BCLKR/FSR; compatible with industry-standard TDM frame formats.
DX	Transmit serial data output	TRI-STATE 8-bit A-law PCM output enabled by FSX; driven synchronously with BCLKX rising edges.
FSX / FSR	Transmit/receive frame sync	8 kHz pulse trains initiating encode/decode cycles; support short (1-bit) or long (≥3-bit) frame sync timing per G.704.
BCLKX / BCLKR	Transmit/receive bit clock	64 kHz–2.048 MHz clocks; BCLKR/CLKSEL pin selects internal divider for master clock (1.536/1.544/2.048 MHz).
MCLKX / MCLKR	Transmit/receive master clock	1.536/1.544 MHz (TP3054) or 2.048 MHz (TP3057); MCLKR/PDN high forces power-down; low enables operation.
TSX	Encoder time-slot indicator	Open-drain pulse low during encoder sampling window; used for external timing synchronization or status monitoring.

Key Features

Feature	Design Value
Integrated A-law CODEC + analog filters	Eliminates need for discrete op-amps, RC networks, and external reconstruction filters - reduces BOM count by ≥12 components per channel.
Internal precision voltage reference	Factory-trimmed to deliver exact 2.492 V_PK overload per G.711 A-law, ensuring consistent dynamic range across temperature and supply variation.
Auto-zero circuitry	Nullifies offset drift in transmit/receive paths, maintaining <±200 mV DC output offset over −25°C to +125°C operating range.
TTL/CMOS-compatible digital interface	Supports direct connection to TI TMS320C54x DSPs, FPGA I/O banks, and microcontrollers without level-shifting circuitry.
Automatic power-down mode	Enters 3 mW standby when MCLKR/PDN is held high or FSX/FSR idle >1 ms; enables rapid channel sleep/wake in multi-channel systems.

Applications

Central Office Line Card	Digital PBX Interface
Use Scenario: 24-channel E1 line card converting analog subscriber loops to 2.048 Mbps PCM streams. IC Role / Device Role / Timing Role: Primary A-law codec per channel; provides analog front-end, A/D conversion, and 600 Ω line driver synchronized to E1 frame clock (2.048 MHz MCLKX). Use Value: Enables full G.711-compliant voice channel density of 24 channels per 160 mm × 100 mm PCB area with <1 W total dissipation.	Use Scenario: Digital PBX backplane interface connecting analog station ports to time-slot interchange (TSI) matrix. IC Role / Device Role / Timing Role: Channelized codec translating analog handset signals to 8-bit A-law PCM for TSI switching; operates in synchronous mode with shared 2.048 MHz clock. Use Value: Delivers <−79 dBm0p receive noise and <−67 dBm0p transmit noise, meeting ITU-T P.53 speech quality thresholds for enterprise voice.
VoIP Gateway FXS Port	Telecom Test Equipment
Use Scenario: Analog telephony adapter (ATA) providing FXS interface for VoIP gateways serving legacy POTS phones. IC Role / Device Role / Timing Role: Bidirectional voice transcoder between analog loop and RTP/UDP packetized A-law PCM; uses short-frame sync for minimal jitter accumulation. Use Value: Achieves 33 dBC signal-to-total-distortion at 0 dBm0, supporting wideband voice clarity up to 3.4 kHz without aliasing artifacts.	Use Scenario: Portable telecom line tester verifying loop continuity, impedance, and PCM signal integrity on deployed copper pairs. IC Role / Device Role / Timing Role: Reference-grade A-law codec generating calibrated test tones and analyzing received PCM frames for bit errors and distortion. Use Value: Provides <−90 dB transmit-to-receive crosstalk and <−46 dB single-frequency distortion, enabling accurate measurement of line impairments per GR-909.

Central Office Line Card

Digital PBX Interface

Use Scenario: 24-channel E1 line card converting analog subscriber loops to 2.048 Mbps PCM streams.

IC Role / Device Role / Timing Role: Primary A-law codec per channel; provides analog front-end, A/D conversion, and 600 Ω line driver synchronized to E1 frame clock (2.048 MHz MCLKX).

Use Value: Enables full G.711-compliant voice channel density of 24 channels per 160 mm × 100 mm PCB area with <1 W total dissipation.

Use Scenario: Digital PBX backplane interface connecting analog station ports to time-slot interchange (TSI) matrix.

IC Role / Device Role / Timing Role: Channelized codec translating analog handset signals to 8-bit A-law PCM for TSI switching; operates in synchronous mode with shared 2.048 MHz clock.

Use Value: Delivers <−79 dBm0p receive noise and <−67 dBm0p transmit noise, meeting ITU-T P.53 speech quality thresholds for enterprise voice.

VoIP Gateway FXS Port

Telecom Test Equipment

Use Scenario: Analog telephony adapter (ATA) providing FXS interface for VoIP gateways serving legacy POTS phones.

IC Role / Device Role / Timing Role: Bidirectional voice transcoder between analog loop and RTP/UDP packetized A-law PCM; uses short-frame sync for minimal jitter accumulation.

Use Value: Achieves 33 dBC signal-to-total-distortion at 0 dBm0, supporting wideband voice clarity up to 3.4 kHz without aliasing artifacts.

Use Scenario: Portable telecom line tester verifying loop continuity, impedance, and PCM signal integrity on deployed copper pairs.

IC Role / Device Role / Timing Role: Reference-grade A-law codec generating calibrated test tones and analyzing received PCM frames for bit errors and distortion.

Use Value: Provides <−90 dB transmit-to-receive crosstalk and <−46 dB single-frequency distortion, enabling accurate measurement of line impairments per GR-909.

Equivalent & Alternatives

The following parts are listed as comparable options for similar A-law PCM codec applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
TP3054N/NOPB	m-law encoding (not A-law); identical pinout, package, and analog performance; different companding table.	Required for North American T1/D4 systems; incompatible with European E1/G.711 A-law infrastructure.	Select TP3054N/NOPB only for m-law deployments; TP3057N/NOPB is mandatory for A-law compliance.
MC145506P	Monolithic A-law codec with integrated SLIC driver; higher supply current (120 mW); no internal power amplifier.	Designed for direct line-driving applications; lacks VFRO 600 Ω output stage; requires external amplifier for hybrid interface.	Choose MC145506P when integrating SLIC functions; TP3057N/NOPB preferred for discrete hybrid-based line cards.

Compared with TP3054N/NOPB, TP3057N/NOPB ensures strict A-law compliance for E1 systems, while MC145506P trades lower integration density for SLIC co-location - making TP3057N/NOPB optimal for high-channel-count, low-power, standards-conforming telephony interface cards.

Availability

TP3057N/NOPB is available at Aetrix Electronics and suitable for central office line cards, digital PBX interfaces, VoIP gateway FXS ports, and telecom test equipment requiring stable component supply and long-term lifecycle assurance.

Supply support for TP3057N/NOPB includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments acquired National Semiconductor in 2011 and maintains full technical support, datasheets, and legacy product continuity for the TP3057N/NOPB.

The TP3057N/NOPB belongs to TI's Telecommunications Analog Line Card Components portfolio, engineered specifically for carrier-grade voice interface applications compliant with ITU-T G.711, G.704, and P.51 standards.

FAQ

What is the primary encoding standard supported by the TP3057N/NOPB?

The TP3057N/NOPB implements strict A-law companding per ITU-T Recommendation G.711. Its encoding table, overload level (2.492 V_PK), and noise performance (−79 dBm0p receive noise) are fully aligned with European and international E1 digital telephony standards. This distinguishes it from the m-law TP3054N/NOPB variant and ensures interoperability with global A-law infrastructure.

Does the TP3057N/NOPB require external filtering components for telephony-band operation?

No - the TP3057N/NOPB integrates all required analog filtering: an active RC pre-filter eliminates out-of-band noise, an eighth-order switched-capacitor bandpass filter enforces 200–3400 Hz transmit response, and a fifth-order switched-capacitor low-pass filter with sin x/x correction reconstructs the receive signal. External components are limited to gain-setting resistors (GSX) and supply decoupling capacitors.

How does the TP3057N/NOPB handle power management in multi-channel systems?

The TP3057N/NOPB supports two power-down modes: asserting high logic on MCLKR/PDN disables internal clocks and reduces current to 3 mW, or holding FSX/FSR continuously low achieves the same state within 1 ms. This allows per-channel sleep control in dense line cards, enabling dynamic power scaling without affecting adjacent channels' operation.

Can the TP3057N/NOPB operate with asynchronous transmit and receive clocks?

Yes - the TP3057N/NOPB supports true asynchronous operation: MCLKX (2.048 MHz) and MCLKR (2.048 MHz) may run independently, with FSR synchronized to BCLKR and FSX to BCLKX. However, best performance (lowest jitter, minimal inter-channel crosstalk) is achieved when MCLKX and MCLKR are phase-locked, which the device facilitates by connecting MCLKR/PDN low to route MCLKX internally to both domains.

What is the maximum output drive capability of the TP3057N/NOPB's VFRO pin?

The VFRO pin delivers ±2.5 V into a 600 Ω load (7.2 dBm), meeting ITU-T P.51 line driving requirements. It features a 2nd-order RC active post-filter and power amplifier optimized for hybrid transformer interfacing. Load capacitance must remain ≤500 pF; for longer traces or heavier loads, external buffering is recommended to maintain THD <0.5%.

TP3057N/NOPB Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: -

Package/Case:: 16-DIP (0.300", 7.62mm)

Packaging:: Bulk

Product Status:: Active

Type:: PCM, Filter

Data Interface:: Serial

Resolution (Bits):: -

Number of ADCs / DACs:: 1 / 2

Sigma Delta:: No

S/N Ratio, ADCs / DACs (db) Typ:: -

Dynamic Range, ADCs / DACs (db) Typ:: -

Voltage - Supply, Analog:: ±4.75V ~ 5.25V

Voltage - Supply, Digital:: ±4.75V ~ 5.25V

Operating Temperature:: -25°C ~ 125°C

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: 16-PDIP

TP3057N/NOPB FAQ

1.How can I place an order for TP3057N/NOPB through Aetrix?

Please submit a Request for Quotation (RFQ) for TP3057N/NOPB on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for TP3057N/NOPB reliable?

The price and inventory of TP3057N/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TP3057N/NOPB is usually 5 days.

3.What payment methods are accepted for TP3057N/NOPB?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TP3057N/NOPB transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for TP3057N/NOPB?

TP3057N/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your TP3057N/NOPB order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for TP3057N/NOPB?

For technical support, including TP3057N/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TP3057N/NOPB requirements.

6.How does Aetrix verify that TP3057N/NOPB is sourced from the original manufacturer or authorized distributors?

All TP3057N/NOPB products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that TP3057N/NOPB meets industry standards.

7.What is the process for return or replacement of TP3057N/NOPB?

All TP3057N/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with TP3057N/NOPB, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The TP3057N/NOPB part is unused and in its original packaging.

Return procedure for TP3057N/NOPB:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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