TP3069

Contents

The TP3069 (A-law) is a monolithic PCM CODEC/Filter utilizing the A/D and D/A conversion architecture shown in Figure 1, and a serial PCM interface. The device is fabricated using National's advanced double-poly CMOS process (microCMOS).

Similar to the TP305X family, this device features an additional Receive Power Amplifier to provide push-pull balanced output drive capability. The receive gain can be adjusted by means of two external resistors for an output level of up to ±6.6V across a balanced 600 Ohm load.

Also included is an Analog Loopback switch and a TS_X# output.

Note: See also AN-370, "Techniques for Designing with CODEC/Filter COMBO Circuits."

• Complete CODEC and filtering system including:
  • Transmit high-pass and low-pass filtering
  • Receive low-pass filter with sin x/x correction
  • Active RC noise filters
  • A-law compatible COder and DECoder
  • Internal precision voltage reference
  • Serial I/O interface
  • Internal auto-zero circuitry
  • Receive push-pull power amplifiers
• Designed for D3/D4 and CCITT applications
• ±5V operation
• Low operating power-typically 70 mW
• Power-down standby mode-typically 3 mW
• Automatic power-down
• TTL or CMOS compatible digital interfaces
• Maximizes line interface card circuit density