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T7502

Dual PCM Codec with Filters

Agere -> LSI Corporation 

Data Sheet

February 1998

T7502 Dual PCM Codec with Filters

Transmission Characteristics (continued)

ac Transmission Characteristics (continued)

Table 8. Envelope Delay Distortion

Parameter

Symbol

Test Conditions

Min Typ Max Unit

TX Delay, Absolute

DXA

f = 1600 Hz

—

—

230

µs

TX Delay, Relative to 1600 Hz

DXR

f = 500 Hz—600 Hz

f = 600 Hz—800 Hz

f = 800 Hz—1000 Hz

f = 1000 Hz—1600 Hz

f = 1600 Hz—2600 Hz

f = 2600 Hz—2800 Hz

f = 2800 Hz—3000 Hz

—

—

220

µs

—

—

145

µs

—

—

75

µs

—

—

40

µs

—

—

75

µs

—

—

105

µs

—

—

155

µs

RX Delay, Absolute

DRA

f = 1600 Hz

—

—

275

µs

RX Delay, Relative to 1600 Hz

DRR

f = 500 Hz—1000 Hz

f = 1000 Hz—1600 Hz

f = 1600 Hz—2600 Hz

f = 2600 Hz—2800 Hz

f = 2800 Hz—3000 Hz

–40

—

—

µs

–30

—

—

µs

—

—

90

µs

—

—

125

µs

—

—

175

µs

Round Trip Delay, Absolute

DRTA

With or between channels

—

f = 1600 Hz

—

470

µs

Overload Compression

Figure 4 shows the region of operation for encoder signal levels above the reference input power (0 dBm0).

9

8

7

6

5

ACCEPTABLE

REGION

4

3

2

1

Lucent Technologies Inc.

1

2

3

4

5

6

7

8

9

FUNDAMENTAL INPUT POWER (dBm)

Figure 4. Overload Compression

5-3586

7

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