ST70136G 데이터 시트보기 (PDF) - STMicroelectronics

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ST70136G

CPE ADSL ANALOG FRONT END

STMicroelectronics 

ST70136

5.3 - Receive Path Specifications

TA = 0 to 70°C unless otherwise specified. The following specifications are guaranteed only when the

Digital Control Interface is not active.

Table 9 : Receive Path Specifications

Typical specifications apply for VCC = 5.0V, temperature = 27°C, nominal process and bias current. Maximum and

minimum performance is with VCC ±5%, 0°C < Tambient < 70°C, and worst case process and bias current.

Description

Min.

Typ.

Max.

Unit

Comments

Output word rate

8.832

Output word resolution 16 bits

16

Reference Input signal a

-0.8

-0.4

0

Common mode voltage

2.4

2.5

2.6

Differential Input impedance

12

20

28

Input noise

b

15

Gain, 0 ≤ D ≤ 31

Step size 1dB

c

D-0.5

D

D+0.5

Step size

Attenuator 0 >= Att >= -3 d

Step size 4dB

0.8

4*Att-0.5

1

4*Att

1.2

4*Att+0.5

Att step size

3.5

4

4.5

AAF cutoff frequency

1

1.4

2

Output SDR

2 tones

e

66

MHz

bits

dBfs

V

kΩ

--n----V-----

Hz

dB

dB

dB

dB

MHz

dBc

Data Sampling frequency

Fref=138KHz, PGA gain=0dB, Vin = 0dBr

(2.4Vpd)

Measured on each single input

Between RXN and RXP

@gain=+31dB, frequency>138KHz

Receive Programmable gain. D is the

binary value of the control word. (see

Section 4.7.1.1 - Rx Gain Control on

page 10

Receive attenuator ATT is the binary

value of the control word. (see Section

4.7.1.1 - Rx Gain Control on page 10

-3dB corner vs low frequency

For RxPGA gain=31dB, measured at

output of ADC.

Notes: a. The corresponding typical value correspond to a 2.4Vpd at RXN/RXP differentiel inputs. The 2.4Vpd correspond to what will be

called 0dBr for the other specifications in the present table. Variations include process, temperature and power variations.

b. The input noise must be measured in the frequency domain from 138KHz to 1.1MHz, with an sinusoidal input signal at -60dBr

amplitude. Frequency of the input signal is 552KHz.

c. D is the gain relatively to the 0dBr previously defined. Variations include process, temperature and power variations.

d. Monotonicity is guaranted for RxPGA, Attenuator, but separatly.

e. Ratio between max peak amplitude of one of the 2 single tones to any spurious measured in the down-stream band

[138KHz-1.1MHz] ; each tone amplitude is at -6-31=-37dBr. The couples are (f1,f2) = (200KHz, 300KHz), (400KHz, 500KHz),

(600KHz, 700KHz).

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