MSP3410D datasheet(25/83 Pages) MICRONAS

25 / 83 page

PRELIMINARY DATA SHEET

MSP 34x0D

Micronas

6.5. Demodulator Write Registers for the General Programming Mode: Functions and Values

6.5.1. Register ‘AD_CV’

Table 6–5: AD_CV Register (reset status: all bits are “0”)

AD_CV 00BBhex

Set by Short-Programming

Bit

Meaning

Settings

AD_CV-FM

AD_CV-AM

AD_CV [0]

not used

must be set to 0

AD_CV [6...1]

Reference level in case of Auto-

matic Gain Control = on (see Table

6–6). Constant gain factor when

Automatic Gain Control = off

(see Table 6–7)

101000

100011

AD_CV [7]

Determination of Automatic Gain or

Constant Gain

0 = constant gain

1 = automatic gain

AD_CV [8]

Selection of Sound IF source

0 = ANA_IN1+

1 = ANA_IN2+

not affected

AD_CV [9]

MSP Carrier Mute Function

(Must be switched off in

High Deviation Mode)

0 = off: no mute

1 = on: mute as de-

scribed in section 4.1.8.

on page 12

AD_CV [15

...10]

not used

must be set to 0

000000

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

Application

Input Signal Contains

AD_CV [6...1]

Ref. Value

AD_CV [6...1]

(dec)

Range of Input Signal

at pin ANA_IN1+

and ANA_IN2+

Terrestrial TV

Dual-Carr. FM

NICAM/FM

NICAM/AM

NICAM only

2 FM Carriers

1 FM and 1 NICAM Carrier

1 AM and 1 NICAM Carrier

1 NICAM Carrier only

101000

100011

010100

0.10

− 3V

0.10

− 3V

0.10

− 1.4 V

recommended:

0.10

− 0.8 V

0.05

− 1.0 V

SAT

1 or more

FM Carriers

100011

0.10

− 3V

ADR

FM a. ADR carriers

see DRP 3510A data sheet

1) For signals above 1.4 V

pp, the minimum gain of 3 dB is switched and overflow of the A/D converter may result.

Due to the robustness of the internal processing, the IC works up to and even more than 3 Vpp, if norm conditions

of FM/NICAM or FM1/FM2 ratio are supposed. In this overflow case, a loss of FM S/N ratio of about 10 dB may

appear.

MSP3410D Datasheet(PDF) 25 Page - Micronas

MSP3410D Datasheet(HTML) 25 Page - Micronas

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83

Datasheet Download

Link URL