DVSR CODEC

21

MX802

1998 MX-COM, Inc.

www.mxcom.com Tel: 800 638 5577 336 744 5050 Fax: 336 744 5054

Doc. # 20480033.008

4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA

All trademarks and service marks are held by their respective companies.

Static Values

Notes

Min.

Typ.

Max.

Units

Encoder/Decoder (Full Codec)

Passband

10, 11

300

3400

Hz

Passband Gain

11

0

dB

Passband Ripple

11

-3.0

3.0

dB

Stopband

6.0

10

kHz

Stopband Attenuation

50.0

dB

SINAD Level

23.0

dB

Output Noise (Input Short Circuit)

-50

dBp

Idle Channel Noise (Forced)

-55

dBp

Xtal/Clock Frequency

6

4.0

MHz

Table 11: Operating Characteristics

Operating Characteristics Notes:

1.

Does not include current drawn by any attached DRAM.

2.

Serial Clock, Command Data, Chip Select, A1/DE1, and A2/DCK inputs

3.

,

WE

,

CAS

and A0 to A9 inputs.

4.

5.

The optimum range levels for a good Signal to Noise ratio.

6.

Audio frequency response will vary with respect to Xtal/Clock frequency.

7.

Reply Data output.

8.

IRQ output.

9.

RAS output.

10. Passband is reduced to (typically) 2700Hz when a sample rate of 25kbps or 50kbps is used.

11. Measured with a –20dB input level to avoid a codec slope-overload.

12. For optimum noise performance this input should be driven from a source impedance of less that

100

.

6.1.4

Timing

C-BUS Timing

Min.

Typ.

Max.

Units

ab

c

Chip Select Low to First Serial Clock Rising Edge

2.0

4.0

8.0

s

Last Serial Clock Rising Edge to Chip Select High

4.0

4.0

8.0

s

Chip Select High to Reply Data High – Z

2.0

s

Chip Select High

2.0

4.0

8.0

s

Command Data Inter-Byte Time

4.0

8.0

16.0

s

Serial Clock Period

2.0

4.0

8.0

s

Direct Address Timing

Decoder or Encoder Clock High

1.0

s

Decoder or Encoder Clock Low

1.0

s

Decoder Data Set Up Time

0.45

s

Decoder Data Hold Time

0.60

s

Encoder Clock High to Encoder Data Valid

0.75

s

Table 12: Timing Information