ADE3700 datasheet(17/89 Pages) STMICROELECTRONICS

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ADE3700

Analog-to-Digital Converter (ADC)

2.3

Analog-to-Digital Converter (ADC)

The analog port consists of three 9-bit RGB ADCs with preamp, gain/offset adjustment and digital

filtering. The I2C interface for the ADC block is in the INCLK clock domain which must be active for

programming.

The relationship of input voltage, gain and offset register settings to output code is approximately as

follows:

output_code_8b = 457 x offset / 28 + 181 x gain x input_mV / 216 - 125 x gain x offset / 216 - 219

Table 5: FM Frequency Synthesizer Registers

Addr

Mode

Bits

Default

Description

FM_FS_CTRL

0x0830

[7:4]

Reserved

R/W

[3]

0x0

Clear the FM synthesizer

R/W

[2]

0x0

Clear the fs accumulator

R/W

[1]

0x0

Activate the frequency modulation

R/W

[0]

0x0

Divide the output by 2

FM_FS_PR_0

0x0831

R/W

[7:0]

8000000

Phase Rate

FM_FS_PR_1

0x0832

R/W

[7:0]

FM_FS_PR_2

0x0833

R/W

[7:0]

FM_FS_PR_3

0x0834

R/W

[7:0]

FM_FS_AMPLITUDE

0x0835

R/W

[7:0]

0x0

LSB = 72 ps

FM_FS_PERIODX64

0x0836

R/W

[7:0]

0x80

LSB = 1.185 us

FM_FS_PULSE_EXT

0x0837

R/W

[7]

0x0

Enable

[6:3]

Reserved

R/W

[2:0]

0x0

Value

Table 6: ADC Registers (Sheet 1 of 2)

Addr.

Mode

Bits

Default

Description

ADC_DITHER

0x0324

[7]

Reserved

R/W

[6]

0x0

Dither horizontally

R/W

[5]

0x0

Dither vertically

R/W

[4]

0x0

Dither temporally

R/W

[3]

0x0

Force dither high

R/W

[2]

0x0

Enable dither

[1:0]

0x0

Reserved

ADC_OFFSET_R

0x0326

R/W

[7:0]

0x0

Offset Control, Red Channel

ADC_OFFSET_G

0x0328

R/W

[7:0]

0x0

Offset Control, Green Channel

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