T7507 参数 Datasheet PDF下载

T7507 Quad PCM Codec with Filters,

Termination Impedance, and Hybrid Balance

Data Sheet

August 1999

Transmission Characteristics

(continued)

ac Transmission Characteristics

(continued)

Table 14. Envelope Delay Distortion

Parameter

T

X

Delay, Absolute*

T

X

Delay, Relative to 1600 Hz

Symbol

D

XA

D

XR

Test Conditions

f = 1600 Hz

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

f = 1600 Hz

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

Any time slot/channel to

any time slot/channel

f = 1600 Hz

Min

—

—

—

—

—

—

—

—

135

–44

–30

—

—

—

—

Typ

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

Max

165 to 425

220

145

75

40

75

105

155

135 to 395

—

—

90

125

175

305 to 625

Unit

µs

µs

µs

µs

µs

µs

µs

µs

µs

µs

µs

µs

µs

µs

µs

R

X

Delay, Absolute*

R

X

Delay, Relative to 1600 Hz

D

RA

D

RR

Round Trip Delay, Absolute*

D

RTA

* Varies as a function of time slots chosen.

Overload Compression

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

9

8

FUNDAMENTAL OUTPUT POWER (dBm)

7

6

5

ACCEPTABLE

REGION

4

3

2

1

1

2

3

4

5

6

7

8

9

FUNDAMENTAL INPUT POWER (dBm)

5-3586(F)

Figure 4. Overload Compression

18

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