AFE5808A datasheet(32/66 Pages) TI1

32 / 66 page

AFE5808A

SLOS729B – OCTOBER 2011 – REVISED APRIL 2012

www.ti.com

VCA Register Map

Table 4. VCA Register Map

ADDRESS

Default

FUNCTION

DESCRIPTION

(DEC)

(HEX)

Value

51[0]

0x33[0]

RESERVED

51[3:1]

0x33[3:1]

LPF_PROGRAMMABILITY

000: 15MHz,

010: 20MHz,

011: 30MHz,

100: 10MHz

51[4]

0x33[4]

PGA_INTEGRATOR_DISABLE

0: Enable

(PGA_HPF_DISABLE)

1: Disables offset integrator for PGA. See explanation for the PGA

integrator function in APPLICATION INFORMATION section

51[6:5]

0x33[6:5]

PGA_CURRENT_CLAMP_LEVEL

00: –2dBFS;

10: 0dBFS;

01:–4dBFS when 51[7]=0

Note: the current clamp circuit makes sure that PGA output is in linear

range. For example, at 00 setting, PGA output HD3 will be worsen by

3dB at –2dBFS ADC input. In normal operation, the current clamp

function can be set as 00

51[7]

0x33[7]

PGA_CURRENT_CLAMP_DISABLE

0:Enables the PGA current clamp circuit;

1:Disables the PGA current clamp circuit before the PGA outputs.

51[6:5] determines the current clamp level

51[13]

0x33[13]

PGA_GAIN_CONTROL

0:24dB;

1:30dB.

52[4:0]

0x34[4:0]

ACTIVE_TERMINATION_

See Table 6 Reg 52[5] should be set as '1' to access these bits

INDIVIDUAL_RESISTOR_CNTL

52[5]

0x34[5]

ACTIVE_TERMINATION_

0: Disables;

INDIVIDUAL_RESISTOR_ENABLE

1: Enables internal active termination individual resistor control

52[7:6]

0x34[7:6]

PRESET_ACTIVE_ TERMINATIONS

00: 50ohm,

01: 100ohm,

10: 200ohm,

11: 400ohm.

(Note: the device will adjust resistor mapping (52[4:0]) automatically.

50ohm active termination is NOT supported in 12dB LNA setting.

Instead, '00' represents high impedance mode when LNA gain is 12dB)

52[8]

0x34[8]

ACTIVE TERMINATION ENABLE

0: Disables;

1: Enables active termination

52[10:9]

0x34[10:9]

LNA_INPUT_CLAMP_SETTING

00: Auto setting,

01: 1.5Vpp,

10: 1.15Vpp and

11: 0.6Vpp

52[11]

0x34[11]

RESERVED

Set to 0

52[12]

0x34[12]

LNA_INTEGRATOR_DISABLE

0: Enables;

(LNA_HPF_DISABLE)

1: Disables offset integrator for LNA. See the explanation for this

function in the following section

52[14:13]

0x34[14:13]

LNA_GAIN

00: 18dB;

01: 24dB;

10: 12dB;

11: Reserved

52[15]

0x34[15]

LNA_INDIVIDUAL_CH_CNTL

0: Disable;

1: Enable LNA individual channel control. See Register 57 for details

53[7:0]

0x35[7:0]

PDN_CH<7:0>

0: Normal operation;

1: Powers down corresponding channels. Bit7

→CH8,

Bit6

→CH7…Bit0→CH1. PDN_CH will shut down whichever blocks are

active depending on TGC mode or CW mode

53[8]

0x35[8]

RESERVED

Set to 0

53[9]

0x35[9]

RESERVED

Set to 0

53[10]

0x35[10]

LOW_POWER

0: Low noise mode;

1: Sets to low power mode (53[11]=0). At 30dB PGA, total chain gain

may slightly change.

See typical characteristics

Submit Documentation Feedback

Product Folder Link(s): AFE5808A

AFE5808A Datasheet(PDF) 32 Page - Texas Instruments

AFE5808A Datasheet(HTML) 32 Page - Texas Instruments

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

Datasheet Descarga

Enlace URL