Audio Codec 1ADC / 2DAC 20-Pin PDIP Rail

The TP3064 (µ-law) and TP3067 (A-law) are monolithic PCM CODEC/Filters utilizing the A/D and D/A conversion architecture shown in Figure 1 , and a serial PCM interface. The devices are fabricated using National’s advanced double-poly CMOS process (microCMOS).Similar to the TP305X family, these devices feature 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 g6.6V across a balanced 600X load. Also included is an Analog Loopback switch and a TSX output. 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
• µ-law or A-law compatible COder and DECoder
• Internal precision voltage reference
• Serial I/O interface
• Internal auto-zero circuitry
• Receive push-pull power amplifiers

µ-law–TP3064

A-law–TP3067

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