MSM7602-001

The MSM7602-001 is a kind of a low-power CMOS IC device for canceling echo (in an acoustic system or telephone line) generated in a speech path. Echo is canceled, in digital signal processing, by estimating the echo path and generating a pseudo echo signal. The device is an improved version of the MSM7520 with the same basic configuration. In addition, the device uses a 19.2 MHz clock frequency to meet PHS, the 3 V power supply (2.7 V to 5.5 V), and compact packaging. Also, this device adds the howling detecter control pins and main clook output pins. Waht's more, it makes possible a quality conversation by controlling the noise level and preventing howling with howling detector, double talk detector, attenuation function, and a gain control function. The devise also controls the low level noise with a center clipping function.

There are some features as follows: (1)handles both acoustic echoes and telephone line echoes.; (2)cancelable echo delay time: for a single chip: 23 ms (max.); (3)echo attenuation: 30 dB (typ.); (4)clock frequency: 19.2 MHz, external input and internal oscillator circuit are provided.; (5)power supply voltage: 2.7 V to 5.5 V; (6)package option: 28-pin plastic SSOP (SSOP28-P-485-0.65-K) (Product name: MSM7602-001GS-K).

What comes next is about the absolute maximum ratings: (1)power supply voltage, VDD: -0.3 to +7 V at Ta=25; (2)input voltage, VIN: -0.3 to VDD+0.3 V at Ta=25; (3)power dissipation, PD: 1 W at Ta=25; (4)storage temperature, TSTG: -55 to +150.

The following is about the recommended operating conditions: first is about the conditions when VDD=2.7 to 3.6 V: (1)power supply voltage, VDD: 2.7 V min, 3.3 V typ and 3.6 V max; (2)power supply voltage, VSS: 0 V typ; (3)high level input voltage, VIH: 2.0 V min and VDD V max at pins other than X1; 2.2 V min and VDD V max at X1 pin; (4)low level input voltage, VIL: 0 V min and 0.5 V max; (5)operating temperature, Ta: -40 min, +25 typ and +85 max. Then is about the conditions when VDD=4.5 to 5.5 V: (1)power supply voltage, VDD: 4.5 V min, 5 V typ and 5.5 V max; (2)power supply voltage, VSS: 0 V typ; (3)high level input voltage, VIH: 2.4 V min and VDD V max at pins other than X1; 3.5 V min and VDD V max at X1 pin; (4)low level input voltage, VIL: 0 V min and 0.8 V max; (5)operating temperature, Ta: -40 min, +25 typ and +85 max.