DSP56156ROM datasheet(17/76 Pages) MOTOROLA

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Electrical Characteristics and Timing

MOTOROLA

DSP56156 Data Sheet

A/D and D/A Performance

(VCCA = 5.0 V dc ± 10%, TJ = -40° to +125°C)

The A/D and D/A performance of the codec section are given in Table 8 with an

example presented in Figure 4.

NOTES:

1. 0 dB gain on the A/D and D/A; Codec clock at 1.538 MHz with 128 decimation/interpolation ratio and

tested at 1502 Hz

2. 0 dBm0 corresponds to -3.14 dB below the input saturation level

Figure 4 Example: S/N and S/N+T Performance for the A/D Section

Table 8 A/D and D/A Performance of Codec

Characteristic

Level

Min

Typ

(See Note 1)

Max

Unit

Analog to Digital Section Signal to Noise

plus Distortion Ratio (S/N+T)

0 dBm0

(See Note 2)

—dB

-50 dBm0

—

Digital to Analog Section Signal to Noise

plus Distortion Ratio (S/N+T)

0 dB

—

-50 dB

—

S in dB

S/N

S/N+T

Signal in dB

÷13

CODEC

÷(12+1)*4

2 MHz

1 MHz

PLL

52 MHz

COCR=$E400

PLL

Codec

÷(12+1)x4

÷ 13

÷ 6.5

13 MHz

A/D and D/A Performance

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

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