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 Nationals 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."