MSP3400C datasheet(21/73 Pages) MICRONAS

21 / 73 page

MSP 3400C

PRELIMINARY DATA SHEET

MICRONAS INTERMETALL

6.2. Registers: Functions and Values

In the following, the functions of several registers are ex-

plained and their (default) values are defined.

6.2.1. Setting of Parameter AD_CV

Table 6–3: AD_CV Register

AD_CV Bit Range

Meaning

Settings

AD_CV [0]

not used

must be set to 0

AD_CV [6:1]

Reference level in case of Automatic Gain

Control = on.

Constant gain factor when Automatic Gain

Control = off .

see Table 6–5

see Table 6–6

AD_CV [7]

Determination of Automatic Gain or Constant

Gain

0 = constant gain

1 = automatic gain

AD_CV [8]

Selection of analog input

0 = ANALOG IN1

1 = ANALOG IN2

AD_CV [9]

MSPC-Carrier-Mute Function

0 = off: no mute

1 = on: mute (see section 4.1.8.)

AD_CV [11–10]

Programmable Carrier-Mute Level

see Table 6–4

AD_CV [15–12]

not used

must be set to 0

Table 6–4: Carrier Mute Level

Step

AD_CV [11:10]

binary

AD_CV [11:10]

decimal

Internal reference level for mute active

(dBr: relative to MSP 3410 )

0 dBr

–3 dBr

–6 dBr

–12 dBr

Table 6–5: Reference values AD_CV [6:1] for active AGC (AD_CV[7] = 1)

Application

Input Signal Contains

Ref. Value

binary

Ref. Value

decimal

Range of Input Signal

at pin ANA_IN_1+ and

ANA_IN_2+

Terrestrial TV

2 FM Carriers

101000

0.14 – 3 Vpp1)

SAT

1 or more FM Carriers

100011

0.14 – 3 Vpp1)

ADR

1 or more FM Carriers and

1 or more ADR Carriers

010100

0.14 – 3 Vpp1)

1) For signals above 1.4 Vpp, the minimum gain of 3 dB is switched and overflow of the AD converter may result. Due

to the robustness of the internal processing in FM mode, the IC works properly up to and even more than 3 Vpp. In AM

mode, of course, no AD converter overflow is allowed. As a consequence, in the AM-mode, the maximum input at pins

41 or 43 must not exceed 1.4 Vpp.

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