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Texas Instruments PCM3794RHBR
- Part No.:
- PCM3794RHBR
- Manufacturer:
- Texas Instruments
- Category:
- CODECS
- Package:
- 32-VFQFN Exposed Pad
- Datasheet:
-
PCM3794RHBR.pdf
- Description:
- IC STER AUDIO CODEC 16BIT 32-QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,939
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Product details
Overview
PCM3794RHBR from Texas Instruments is a 16-bit stereo audio CODEC with integrated headphone amplifier, analog mixing, microphone bias, and digital tone control - but no digital speaker amplifier (unlike PCM3793). It supports I²C/SPI control, 5–50 kHz sampling, 93 dB DAC dynamic range, and operates from 1.71–3.6 V digital and 2.4–3.6 V analog supplies. It targets portable audio playback and recording in space-constrained devices.
For engineers reviewing the PCM3794RHBR datasheet, PCM3794RHBR pinout, PCM3794RHBR application, or PCM3794RHBR equivalent, key selection considerations include its absence of Class-D speaker outputs, QFN-32 package footprint, headphone plug detection (HDTI), programmable gain amplifiers (±12 dB to +30 dB), and support for capless headphone output mode.
Technical Context
The PCM3794RHBR implements delta-sigma ADC/DAC architecture with decimation/interpolation filters, configurable high-pass (4 Hz or 240 Hz) and dual programmable notch filters, and three-band (bass/mid/treble) digital tone control. Its analog front-end includes six single-ended or mono differential inputs with selectable 0/20 dB mic boost and independent 30 dB to –12 dB PGA per channel.
Control is handled via 2-wire I²C or 3-wire SPI interface; register-based configuration enables dynamic power-up/down of individual blocks (ADC, DAC, HP amp, mic bias), ALC for recording, zero-cross volume updates, and headphone plug insertion detection (HDTI → HPDS register). The device lacks SPOLP/SPOLN/SPORP/SPORN pins - confirming no integrated speaker amplifier functionality.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit audio data path - ensures CD-quality fidelity and compatibility with standard audio DSPs and codecs. |
| DAC Dynamic Range | 93 dB (A-weighted) - enables low-noise playback suitable for high-fidelity portable headphones. |
| ADC Dynamic Range | 90 dB (A-weighted) - supports clean voice capture and line-level recording without external preamps. |
| Sampling Rate | 5–50 kHz - covers narrowband telephony (8 kHz) through full-range audio (48 kHz), including DMB/PMP use cases. |
| Headphone Output | 40 mW + 40 mW at 16 Ω - drives standard stereo headphones directly without external amplification. |
| Supply Voltages | VIO/VDD: 1.71–3.6 V; VCC/VPA: 2.4–3.6 V - enables flexible dual-rail power design with battery voltage scaling. |
| Package | 32-pin QFN, 5 mm × 5 mm - compact footprint ideal for slim mobile PCBs with tight thermal constraints. |
Pinout & Package
PCM3794RHBR uses a 32-pin QFN package (RHB suffix) with exposed thermal pad. Pin functions are defined per TI SLES193C datasheet; PCM3794 omits all speaker output pins (SPOLP/SPOLN/SPORP/SPORN) present on PCM3793.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AIN1L / AIN1R | Stereo analog input pair | Supports mono differential mic input or line input; high-Z (20 kΩ) and programmable PGA (30 dB to –12 dB). |
| HPOL/LOL / HPOR/LOR | Stereo headphone/line output | Capable of capless operation; volume programmable from +6 dB to –70 dB in fine steps (0.5/1/2/4 dB). |
| HPCOM/MONO | Common/mono output | Configurable as mono line out or headphone common; gain adjustable independently for balanced drive. |
| HDTI | Headphone detect input | Monitors plug insertion; triggers automatic HP enable/disable and status flag (HPDS register) via I²C. |
| MICB | Microphone bias source | Provides 0.75×VCC bias voltage with 2 mA sourcing capability - sufficient for electret condenser mics. |
| MODE / MS/ADR / MC/SCL / MD/SDA | Serial interface control | Selects I²C (MODE=HIGH) or SPI (MODE=LOW); supports register access without external level shifters. |
| VIO / VDD / VCC / VPA | Power domains | Independent rails: VIO/VDD (digital I/O/core), VCC (analog), VPA (power amp) - allow optimized noise isolation and battery efficiency. |
Key Features
| Feature | Design Value |
|---|---|
| Capless headphone output | Eliminates DC-blocking capacitors on HPOL/HPOR outputs - reduces BOM count and board area in ultra-thin designs. |
| Programmable analog mixing | Enables FM radio, auxiliary analog sources, or mic+line mix without digitization - bypasses ADC/DAC for lower latency and power. |
| Configurable high-pass & notch filters | Removes DC offset (4 Hz/240 Hz HPF) and mechanical noise (dual programmable notch) - improves recording clarity in camcorders and DSCs. |
| Three-band digital tone control | Bass/mid/treble adjustment (±12 dB in 1-dB steps) with automatic anti-clipping (LPAE) - enables user-tailored sound profiles in PMPs. |
| Automatic Level Control (ALC) | Digitally adjusts mic gain in real time to prevent clipping during loud transients - essential for consistent voice recording in variable environments. |
Applications
| Portable Media Player (PMP) | Digital Still Camera (DSC) |
|---|---|
Use Scenario: High-fidelity music playback with customizable EQ and low-power headphone drive in handheld consumer devices. IC Role / Device Role: Audio CODEC handling DAC, headphone amplification, tone control, and power management. Use Value: 93 dB DAC SNR and capless HP output reduce component count while maintaining audiophile-grade output quality. | Use Scenario: Simultaneous stereo audio recording (voice memo) and playback (review) during photo capture sessions. IC Role / Device Role: Dual-path audio processor supporting ALC-enabled mic input, line-in mixing, and headphone monitoring. Use Value: Integrated ALC and programmable PGA ensure distortion-free voice capture across varying acoustic conditions. |
| Video Camcorder | Cellular Handset (Legacy Feature Phone) |
Use Scenario: Stereo audio capture synchronized with HD video, with wind-noise suppression and headphone monitoring. IC Role / Device Role: ADC front-end with high-pass filter (240 Hz), dual notch filters, and headphone output for real-time monitoring. Use Value: Programmable notch filters suppress motor/CCD noise; HDTI pin enables auto-mute on headset insertion. | Use Scenario: Compact voice call path with echo-cancellation-ready analog mixing, mic bias, and low-noise line/headphone outputs. IC Role / Device Role: Full analog audio subsystem - mic preamp, line driver, HP amp, and bias generator in one chip. Use Value: Single-chip solution replaces discrete op-amps and regulators, reducing layout complexity and cost in entry-tier handsets. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar audio CODEC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| PCM3793RHBR | Includes integrated 700 mW Class-D stereo speaker amplifier (SPOLP/SPOLN/SPORP/SPORN pins); otherwise identical pinout and register map. | Required when driving 8-Ω speakers directly; unsuitable if only headphone/line output needed due to extra power consumption and thermal load. | Select PCM3793RHBR only if speaker amplification is mandatory; PCM3794RHBR saves power and die area when speaker amp is omitted. |
| TLV320AIC3106IRHBT | Lower power (5 mW playback), 24-bit resolution, integrated LDOs, but no headphone plug detection (HDTI) or capless HP mode. | Better for ultra-low-power wearables; lacks HDTI-driven auto-switching and capless HP - requires external DC-blocking caps. | Choose TLV320AIC3106IRHBT for extended battery life in always-on devices; retain PCM3794RHBR for legacy system compatibility and plug-detect automation. |
Compared with PCM3793RHBR, PCM3794RHBR removes speaker amplifier circuitry to reduce quiescent current and thermal dissipation, making it optimal for headphone-centric portable designs; versus TLV320AIC3106IRHBT, it offers hardware-assisted plug detection and capless headphone drive - critical for mechanical simplicity in consumer audio.
Availability
PCM3794RHBR is available at Aetrix Electronics and suitable for portable media players, digital still cameras, video camcorders, and cellular handsets requiring stable component supply and long-lifecycle support.
Supply support for PCM3794RHBR 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 is a global semiconductor leader specializing in analog, embedded processing, and connectivity technologies for industrial, automotive, and consumer markets.
The PCM3794RHBR belongs to TI's portable audio CODEC product line, designed specifically for low-power, high-fidelity audio subsystems in battery-operated devices where integration, small footprint, and intelligent power management are critical.
FAQ
Does PCM3794RHBR include a built-in speaker amplifier?
No, PCM3794RHBR does not include a speaker amplifier. Unlike the pin-compatible PCM3793RHBR, it omits SPOLP, SPOLN, SPORP, and SPORN pins entirely. This makes PCM3794RHBR suitable for headphone/line-output-only applications where speaker drive is handled externally or not required. The datasheet explicitly states "PCM3794 has no Speaker Output" in the functional block diagram notes.
What is the function of the HDTI pin on PCM3794RHBR?
The HDTI (Headphone Detect Input) pin on PCM3794RHBR senses mechanical insertion of a 3.5-mm headphone jack and reports status via register 77 (HPDS). When enabled (HPDE = 1), it automatically powers up/down the headphone amplifier and can invert polarity via HPDP. This eliminates need for external detection circuitry and enables seamless user experience in portable audio devices using PCM3794RHBR.
Can PCM3794RHBR operate with a single 3.3-V supply?
Yes, PCM3794RHBR can operate with a single 3.3-V supply applied to all rails (VIO, VDD, VCC, VPA), as confirmed by recommended operating conditions: VIO/VDD = 1.71–3.6 V and VCC/VPA = 2.4–3.6 V. However, separating analog (VCC/VPA) and digital (VIO/VDD) supplies improves PSRR and SNR. The PCM3794RHBR datasheet shows typical performance measured at 3.3 V across all domains.
How does PCM3794RHBR support capless headphone output?
PCM3794RHBR supports capless headphone output via internal DC bias generation at 0.5×VCC on HPOL/HPOR/HPCOM pins, enabling direct coupling to headphones without external blocking capacitors. This is enabled by register 74 (HPS[2:0]) and requires proper VCOM decoupling (10 µF to AGND). Capless mode reduces BOM cost and PCB area - a key advantage in slim portable designs using PCM3794RHBR.
Is PCM3794RHBR pin-compatible with PCM3793RHBR?
Yes, PCM3794RHBR is pin-compatible with PCM3793RHBR in the same 32-pin QFN (RHB) package. Both share identical pin assignments except that PCM3794RHBR leaves SPOLP, SPOLN, SPORP, and SPORN pins as No Connect (NC), as shown in the top-view diagrams. This allows drop-in replacement in layouts designed for PCM3793RHBR when speaker amplification is unnecessary - simplifying design reuse with PCM3794RHBR.
PCM3794RHBR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 32-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Stereo Audio
- Data Interface:
- Serial
- Resolution (Bits):
- 16 b
- Number of ADCs / DACs:
- 2 / 2
- Sigma Delta:
- Yes
- S/N Ratio, ADCs / DACs (db) Typ:
- 90 / 93
- Dynamic Range, ADCs / DACs (db) Typ:
- 90 / 93
- Voltage - Supply, Analog:
- 2.4V ~ 3.6V
- Voltage - Supply, Digital:
- 1.71V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-VQFN (5x5)
PCM3794RHBR FAQ
1.How can I place an order for PCM3794RHBR through Aetrix?
Please submit a Request for Quotation (RFQ) for PCM3794RHBR 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 PCM3794RHBR reliable?
The price and inventory of PCM3794RHBR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PCM3794RHBR is usually 5 days.
3.What payment methods are accepted for PCM3794RHBR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PCM3794RHBR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PCM3794RHBR?
PCM3794RHBR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PCM3794RHBR 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 PCM3794RHBR?
For technical support, including PCM3794RHBR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PCM3794RHBR requirements.
6.How does Aetrix verify that PCM3794RHBR is sourced from the original manufacturer or authorized distributors?
All PCM3794RHBR 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 PCM3794RHBR meets industry standards.
7.What is the process for return or replacement of PCM3794RHBR?
All PCM3794RHBR units undergo pre-shipment inspection (PSI). If there is an issue with PCM3794RHBR, 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 PCM3794RHBR part is unused and in its original packaging.
Return procedure for PCM3794RHBR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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