TLV320AC37CN - 3V Voice-Band Audio Processor | Texas Instruments
MPN: TLV320AC37CN ✗ End of Life| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $1.95 | $1.95 |
| 10 | $1.75 | $17.50 |
| 100 | $1.55 | $155.00 |
| 500 | $1.35 | $675.00 |
| 1,000 | $1.15 | $1,150.00 |
TLV320AC37CN Overview
A voice-band audio processor (VBAP) is a specialized mixed-signal IC that combines analog-to-digital and digital-to-analog conversion with filtering and signal processing optimized for the 300 Hz to 3.4 kHz voice band. It sits within the broader category of audio codecs, which are essential in telephony, intercoms, and voice-controlled systems. The TLV320AC37CN specifically targets low-power, battery-operated voice applications, offering a complete analog front-end and codec in a single package.
Key features include a low operating power of 20 mW typical, standby mode at 5 mW, and power-down mode at 2 mW. The device supports extended variable-frequency operation with sample rates up to 16 kHz and a pass-band to 7.2 kHz. It includes an electret microphone interface, making it ideal for direct connection to electret condenser microphones. The combined A/D, D/A, and filters simplify system design by reducing external components.
Technically, the TLV320AC37CN employs a CMOS process and operates from a single 3-V supply, which is critical for portable and battery-powered equipment. The device features a PCM codec interface with A-law companding, suitable for digital telephony standards. The through-hole PDIP-20 package ensures easy prototyping and manual assembly, though it limits high-density applications compared to surface-mount alternatives.
Typical applications include digital telephone answering machines, speakerphones, intercom systems, and voice recorders. The low power consumption and 3-V operation make it particularly suited for battery-powered devices where efficiency is paramount. The integrated filters and codec reduce BOM cost and board space.
When designing with this device, ensure proper decoupling of the 3-V supply and careful layout of the analog and digital sections to minimize noise coupling. The device is now obsolete, so consider pin-compatible alternatives for new designs.
Drop-in alternatives for TLV320AC37CN — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
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Request AlternativesTLV320AC37CN Maximum Ratings & Electrical Characteristics
| Supply Voltage | 3 V (single) |
| Operating Power | 20 mW (typ) |
| Standby Power | 5 mW (typ) |
| Power-Down Power | 2 mW (typ) |
| Sample Rate | Up to 16 kHz |
| Pass-Band | Up to 7.2 kHz |
| Package | PDIP-20 (0.300, 7.62mm) |
| Terminal Form | Through-Hole |
| Number of Terminals | 20 |
| Package Code | DIP |
| Temperature Grade | Commercial |
| Function | PCM Codec, A-Law, 1-Func, CMOS |
| Technology | CMOS |
| Mounting Type | Through-Hole |
TLV320AC37CN Pin Configuration
| Pin 1 | VCC — Power supply (3V) |
| Pin 2 | GND — Ground |
| Pin 3 | MICIN — Microphone input |
| Pin 4 | MICBIAS — Microphone bias voltage |
| Pin 5 | AIN — Analog input |
| Pin 6 | AOUT — Analog output |
| Pin 7 | DOUT — Digital data output |
| Pin 8 | DIN — Digital data input |
| Pin 9 | BCLK — Bit clock |
| Pin 10 | FS — Frame sync |
| Pin 11 | MCLK — Master clock |
| Pin 12 | PDN — Power down control |
| Pin 13 | STBY — Standby control |
| Pin 14 | NC — No connect |
| Pin 15 | NC — No connect |
| Pin 16 | NC — No connect |
| Pin 17 | NC — No connect |
| Pin 18 | NC — No connect |
| Pin 19 | NC — No connect |
| Pin 20 | VCC — Power supply (3V) |
Typical Applications
TLV320AC37CN is suitable for 6 applications: Digital Telephone Answering Machine, Speakerphone, Intercom System, Voice Recorder, Telecommunication Equipment, Battery-Powered Audio Device.
Digital Telephone Answering Machine
The TLV320AC37CN provides voice-band A/D and D/A conversion with integrated filters, enabling digital recording and playback of voice messages. Its low power consumption (20 mW) is ideal for continuous operation in answering machines. The 3-V supply allows direct battery operation, and the PCM interface connects easily to a digital controller. The pass-band up to 7.2 kHz ensures clear voice reproduction, while the standby mode reduces power when idle.
Recommended
Speakerphone
In speakerphone systems, the TLV320AC37CN handles voice-band audio processing, converting analog microphone signals to digital and back. Its integrated filters reduce external component count, simplifying design. The low power consumption is beneficial for desktop and portable speakerphones. The device supports sample rates up to 16 kHz, sufficient for voice, and the A-law companding matches telephony standards. The through-hole PDIP package aids in prototyping.
Recommended
Intercom System
The TLV320AC37CN is well-suited for intercom systems, providing full-duplex voice processing with its combined A/D and D/A converters. Its 3-V operation allows battery-powered intercoms, and the low power modes extend battery life. The device's voice-band filtering improves intelligibility in noisy environments. The PCM interface enables easy connection to a central control unit. The PDIP-20 package is convenient for through-hole PCB assembly.
Recommended
Voice Recorder
For voice recorders, the TLV320AC37CN offers low-power voice-band conversion, enabling long recording times on battery power. Its integrated filters and A/D converter capture voice signals efficiently. The device supports sample rates up to 16 kHz, adequate for voice, and the power-down mode conserves energy when not recording. The through-hole package is suitable for compact designs with proper layout. The PCM output can be stored in external memory.
Recommended
Telecommunication Equipment
The TLV320AC37CN is designed for telecommunication applications, providing a complete voice-band codec with A-law companding. Its 3-V operation is compatible with modern telecom power rails, and the low power consumption reduces heat in dense equipment. The device's filters meet voice-band requirements, and the PCM interface integrates with digital switching systems. The PDIP-20 package is easy to handle in legacy designs.
Recommended
Battery-Powered Audio Device
The TLV320AC37CN's low power consumption (20 mW operating, 2 mW power-down) makes it ideal for battery-powered audio devices. Its single 3-V supply can be directly powered by two AA batteries or a Li-ion cell. The integrated filters and codec reduce external components, saving space and power. The device supports voice-band audio, suitable for portable voice assistants or recorders. The through-hole package is acceptable for low-profile designs.
Recommended
Recommended Products Summary
Engineering reference data for TLV320AC37CN — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | TLV320AIC3110IRHBT | TLV320AIC23B | PCM2705C |
|---|---|---|---|---|
| Package | PDIP-20 | QFN-32 | TQFP-28 | TSSOP-28 |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Supply Voltage | 3 V | 1.8V - 3.6V | 2.7V - 3.6V | 3.3V |
| Power Consumption | 20 mW (typ) | 14 mW (typ) | 23 mW (typ) | 50 mW (typ) |
| Sample Rate | Up to 16 kHz | Up to 96 kHz | Up to 96 kHz | Up to 48 kHz |
| Interface | PCM (A-law) | I2S, PCM | I2S, SPI | USB |
| Mounting Type | Through-Hole | Surface Mount | Surface Mount | Surface Mount |
| Lifecycle | Obsolete | Active | Active | Active |
Key Differentiators
- Low power consumption (vs PCM2705C)
- Through-hole package (vs TLV320AIC3110IRHBT)
- Voice-band optimized (vs TLV320AIC23B)
Design Notes
The TLV320AC37CN operates from a single 3-V supply. Ensure a clean, regulated 3-V supply with adequate decoupling capacitors (e.g., 0.1uF and 10uF) close to the VCC pins. The low power consumption (20 mW) allows simple power supply design, but avoid excessive ripple to maintain audio quality.
For through-hole PDIP-20, use a PCB with proper pad sizes and spacing. Keep analog and digital ground planes separate and connect at a single point to minimize noise. Place the device away from high-frequency digital circuits to reduce interference. Use short traces for analog signals.
The TLV320AC37CN is obsolete, so verify availability before designing it into a new product. Also, ensure the microphone input is properly biased and the electret microphone is connected correctly. Avoid exceeding the 3-V supply voltage to prevent damage.
Compliance Information
Compliance information not provided in the verified data. The part is obsolete, so compliance may not be guaranteed.
