MC145502P 查看數據表（PDF） - Motorola => Freescale

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MC145502P

PCM Codec-Filter Mono-Circuit

Motorola => Freescale 

R0 = 600 Ω R0 = 900 Ω

R0

– 48

N=1

N=1

R5

N=2

R6

R0

VSS

R4

R3

+ Vref

RSI

VAG

VDD

RxO

RDD

RxG

RCE

RxO

RDC

+ Tx

TDC

R2

R1

NOTE: Balance by R5 and R6 to equate the Txl gains through the inverting

and non–inverting input signal paths, respectively, is given by:

R1 1 – R3 = 1 + R1

R6 – R3

R5

2 × R2

R4

R2 R5 + R6 R4 R5 + R6

Tx Gain = R1/R2

Rx Gain = 1 + R3/R4

R5, R6 ≈ 10 kΩ

Adjust Rx Gain with R3

Adjust Tx Gain with R1

TxI

CCI

– Tx

TDD

Mu/A

TDE

PDI

MSI

VSS

VLS

MC145502

24a. Universal Transformer Hybrid Using MC145502

T

R0

– 48

R

R0 = 600

N=1

+ Vref

RSI

10 kΩ

VSS

VAG

VDD

N=2

20 kΩ

RxO

RDD

R0

N=1

RxG

RCE

RxO

RDC

10 kΩ

20 kΩ

+ Tx

TDC

TxI

CCI

– Tx

TDD

Mu/A

TDE

PDI

MSI

VSS

VLS

MC145502

24b. Single–Ended Hybrid Using MC145502

R0 = 900

Figure 24. Hybrid Interfaces to the MC145502 PCM Codec–Filter Mono–Circuit

MOTOROLA

MC145500•MC145501•MC145502•MC145503•MC145505

19

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