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Texas Instruments PCM3501E
- Part No.:
- PCM3501E
- Manufacturer:
- Texas Instruments
- Category:
- CODECS
- Package:
- 24-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
PCM3501E.pdf
- Description:
- IC VOICE/MODEM CODEC 24-SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,591
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Product details
Overview
PCM3501E from Burr-Brown (now Texas Instruments) is a low-voltage, mono 16-bit voice/modem CODEC integrating delta-sigma ADC and DAC, differential analog I/O, on-chip crystal oscillator, and time-slot TDM support for up to four devices on one serial bus. It operates from +2.7V to +3.6V, delivers 88dB typical dynamic range at 8kHz sampling, and draws only 60µA in power-down mode - ideal for portable speech processing and software modem AFEs.
For engineers reviewing the PCM3501E datasheet, PCM3501E pinout, PCM3501E application, or PCM3501E equivalent, key selection considerations include its 24-pin SSOP package, 7.2–26kHz programmable sampling rate, master/slave serial interface with 512fS system clock requirement, and integrated analog filters enabling glue-free connection to DSPs in voice recorder, teleconferencing, and embedded modem designs.
Technical Context
The PCM3501E implements dual delta-sigma modulation: a 16-bit ADC with on-chip anti-aliasing filter and high-pass DC-blocking filter, and a 16-bit DAC with interpolation and output low-pass filtering. Its digital architecture supports MSB-first two's complement data format, 16-bit frame length, and time-division multiplexed operation across four slots per 64-bit frame.
It features configurable clocking - accepting external 3.686–13.312MHz system clocks via XTI or SCKIO, or generating clock internally using a parallel-resonant crystal (XTI/XTO). The device supports both master (FS/BCK outputs) and slave (FS/BCK inputs) serial modes, with synchronization loss detection that forces DAC output to VCOM and tri-states DOUT within one frame period.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit ADC and DAC - enables 92dB DAC SNR and 88dB ADC dynamic range for voice-band fidelity. |
| Sampling Frequency | 7.2–26kHz - supports standard voice (8kHz), wideband speech (16kHz), and software modem (up to 56kbps-equivalent) applications. |
| Supply Voltage | +2.7V to +3.6V - single-supply operation compatible with Li-ion and low-power embedded rails. |
| Power-Down Current | 60µA typical - allows rapid entry/exit from ultra-low-power state without external sequencing. |
| Dynamic Range (ADC) | 82–88dB at fS = 8kHz - meets ITU-T G.712 requirements for voice codec linearity and noise floor. |
| THD+N (DAC) | –90dB to –82dB at –0dBFS - ensures clean playback with minimal harmonic distortion in audio paths. |
| Package | 24-Lead SSOP (338 drawing) - surface-mount footprint with 0.635mm pitch, suitable for compact modem PCB layouts. |
Pinout & Package
PCM3501E is housed in a 24-pin Small Outline Shrink Plastic (SSOP) package per drawing 338, with 0.635mm lead pitch and exposed thermal pad not connected internally. Pin functions are validated per official Burr-Brown PDS-1569A datasheet Rev A (Dec 1999).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN+, VIN– | Differential ADC input | Accepts ±0.6VCC full-scale differential signal; internal AAF provides alias rejection beyond 0.425fS. |
| VOUT+, VOUT– | Differential DAC output | Delivers ±0.6VCC differential output; integrated LPF limits out-of-band noise to <–65dB beyond 0.58fS. |
| M/S | Master/Slave mode select | Schmitt-trigger input with internal pull-down; logic high enables FS/BCK generation, logic low configures as serial slave. |
| TSC | Time Slot Control | Enables/disables 64-bit TDM frame structure; when active, FSO outputs slot-sync pulses and DOUT becomes tri-state outside assigned slot. |
| PDWN | Power-down/reset control | Active-low input with internal pull-down; asserts reset on rising edge and enters 60µA power-down when held low. |
| XTI / XTO | Crystal oscillator interface | XTI accepts crystal or external clock; XTO outputs crystal drive - supports fundamental-mode parallel-resonant crystals (10–33pF load). |
| SCKIO | System clock I/O | Configurable as 512fS clock output (crystal mode) or input (external clock mode); XTI must be grounded when used as input. |
| BCK, FS, DIN, DOUT | 4-wire synchronous serial interface | Supports DSP-format frames at 16fS (normal) or 64fS (TDM); BCK edge-aligned timing ensures deterministic data capture. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated analog front end | On-chip AAF, HPF (DC blocking), and LPF eliminate need for external passive filters in voice-band signal chains. |
| ADC-to-DAC loop-back mode | Hardware-accelerated self-test path via LOOP pin - enables real-time signal integrity verification without host processor involvement. |
| Time-slot TDM support | Four independent 16-bit slots per 64-bit frame allow daisy-chaining up to four PCM3501E devices on shared BCK/FS/DIN/DOUT lines. |
| Flexible clock architecture | Single 512fS clock domain drives all digital blocks; eliminates inter-clock-domain metastability risks in mixed-signal SoC integration. |
| Low-power design | 60µA power-down current and 9–12mA active supply draw enable battery life extension in handheld modems and voice recorders. |
Applications
| Software Modem AFE | Voice Recorder/Player |
|---|---|
|
Use Scenario: Embedded software modem in PDA or set-top box handling V.34/V.90 line signaling over analog PSTN interface. IC Role / Device Role / Timing Role: Mono CODEC providing analog conditioning, 8–16kHz sampling, and DSP-synchronized serial interface for modem firmware. Use Value: Integrated AAF/HPF/LPF and 56kbps-supporting bandwidth reduce external component count by ≥7 parts versus discrete filter solutions. |
Use Scenario: Portable voice memo recorder with microcontroller-based storage and playback control. IC Role / Device Role / Timing Role: Standalone analog I/O engine converting microphone input and speaker output at 8kHz with minimal host overhead. Use Value: 60µA power-down current extends battery runtime >200 hours in standby; differential I/O rejects board-level noise in compact enclosures. |
| Speech Recognition System | Teleconferencing Terminal |
|
Use Scenario: Edge-node speech recognition module capturing near-field voice for keyword spotting in smart home devices. IC Role / Device Role / Timing Role: Low-noise ADC front end delivering 88dB DR audio to ASR engine; HPF disables DC drift during long-duration capture. Use Value: 82–88dB dynamic range meets SNR requirements for MFCC feature extraction; 2.7V operation matches MCU I/O voltage. |
Use Scenario: Multi-mic USB teleconferencing speakerphone supporting full-duplex echo cancellation. IC Role / Device Role / Timing Role: One of four synchronized PCM3501E units in TDM mode, each handling a dedicated mic channel at 16kHz. Use Value: Time-slot mode eliminates separate serial buses - reduces PCB routing layers and controller pin count by 75% vs individual interfaces. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voice/modem CODEC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV320AIC10CP | 16-bit sigma-delta CODEC with 3.3V-only supply, no on-chip crystal oscillator, and fixed 8kHz sampling. | Lacks TDM time-slot mode and variable sampling; requires external clock generator and filters. | Choose for cost-sensitive, fixed-rate voice systems where external clocking is already available. |
| PCM3001E | Pin-compatible predecessor with identical 24-SSOP package but lower 84dB DAC SNR and no HPF disable control (HPFD pin absent). | Not suitable for DC-coupled sensor interfaces requiring HPF bypass; limited to legacy modem designs. | Prefer PCM3501E when higher dynamic range, HPF configurability, or crystal oscillator integration is required. |
Compared with TLV320AIC10CP and PCM3001E, the PCM3501E uniquely combines on-chip crystal oscillator, programmable 7.2–26kHz sampling, and hardware TDM slot control - reducing BOM count and layout complexity in multi-channel voice systems without sacrificing SNR or power efficiency.
Availability
PCM3501E is available at Aetrix Electronics and suitable for software modem AFEs, portable voice recorders, speech recognition modules, and teleconferencing terminals requiring stable component supply and long-lifecycle support.
Supply support for PCM3501E 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
Burr-Brown Corporation, acquired by Texas Instruments in 2000, specialized in precision analog ICs including data converters, amplifiers, and interface products for industrial and communications markets.
The PCM3501E belongs to Burr-Brown's voice and modem CODEC product line, designed specifically for low-power, low-cost analog front ends in portable and embedded telephony applications - emphasizing integration, power efficiency, and DSP interoperability.
FAQ
What is the maximum sampling frequency supported by the PCM3501E?
The PCM3501E supports a sampling frequency range of 7.2kHz to 26kHz, with corresponding system clock frequencies from 3.6864MHz to 13.312MHz (512×fS). At 26kHz, it enables wideband speech processing and high-speed software modem operation while maintaining 82dB ADC dynamic range per datasheet specifications.
Does the PCM3501E require external analog filters?
No - the PCM3501E integrates an input anti-aliasing filter (AAF), digital high-pass filter (HPF) for DC blocking, and output low-pass filter (LPF). These eliminate the need for external passive RC or active filters in standard voice-band applications, simplifying design and reducing bill-of-materials cost.
How does the PCM3501E handle clock synchronization loss?
When the PCM3501E detects phase misalignment between FS and the system clock exceeding ±1.5 BCK periods, it forces the DAC output to VCOM (0.5VCC) and places DOUT in high-impedance state within one frame period. This fail-safe behavior prevents corrupted audio output during clock instability.
Can multiple PCM3501E devices share a single serial bus?
Yes - the PCM3501E supports Time Division Multiplexing (TDM) via its time-slot mode (enabled by TSC pin). Up to four PCM3501E units can share one 4-wire serial interface (BCK/FS/DIN/DOUT), each occupying a dedicated 16-bit slot within a 64-bit frame.
What is the function of the HPFD pin on the PCM3501E?
The HPFD (High-Pass Filter Disable) pin is a Schmitt-trigger input with internal pull-down. When driven high, it disables the digital high-pass filter in the ADC path - allowing DC or near-DC signals (e.g., sensor outputs) to pass through without attenuation, which is essential for non-voice applications.
PCM3501E Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SoundPlus™
- Package/Case:
- 24-SSOP (0.209", 5.30mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- Type:
- Voice-Band
- Data Interface:
- Serial
- Resolution (Bits):
- 16 b
- Number of ADCs / DACs:
- 1 / 1
- Sigma Delta:
- Yes
- S/N Ratio, ADCs / DACs (db) Typ:
- 88 / 94
- Dynamic Range, ADCs / DACs (db) Typ:
- 88 / 92
- Voltage - Supply, Analog:
- 2.7V ~ 3.6V
- Voltage - Supply, Digital:
- 2.7V ~ 3.6V
- Operating Temperature:
- -25°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-SSOP
PCM3501E FAQ
1.How can I place an order for PCM3501E through Aetrix?
Please submit a Request for Quotation (RFQ) for PCM3501E 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 PCM3501E reliable?
The price and inventory of PCM3501E are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PCM3501E is usually 5 days.
3.What payment methods are accepted for PCM3501E?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PCM3501E transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PCM3501E?
PCM3501E orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PCM3501E 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 PCM3501E?
For technical support, including PCM3501E datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PCM3501E requirements.
6.How does Aetrix verify that PCM3501E is sourced from the original manufacturer or authorized distributors?
All PCM3501E 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 PCM3501E meets industry standards.
7.What is the process for return or replacement of PCM3501E?
All PCM3501E units undergo pre-shipment inspection (PSI). If there is an issue with PCM3501E, 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 PCM3501E part is unused and in its original packaging.
Return procedure for PCM3501E:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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