AFE5808ZCF datasheet(31/68 Pages) TI1

31 / 68 page

AFE5808

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SLOS688C – SEPTEMBER 2010 – REVISED APRIL 2012

VCA Register Map

Table 4. VCA Register Map

ADDRESS 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. Please see explanation

for the PGA integrator function in APPLICATION

INFORMATION section

51[6:5]

0x33[6:5]

PGA_CLAMP_LEVEL

00: –2dBFS;

10: 0dBFS;

01:–4dBFS when 51[7]=0

Note: the 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,

clamp function can be set as 00

51[7]

0x33[7]

PGA_CLAMP_DISABLE

0:Enables the PGA clamp circuit;

1:Disables the PGA clamp circuit at PGA outputs. 51[6:5]

determines the clamp output level

51[13]

0x33[13]

PGA_GAIN_CONTROL

0:24dB;

1:30dB

52[4:0]

0x34[4:0]

ACTIVE_TERMINATION_

SeeTable 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: 50

Ω,

01: 100

Ω,

10: 200

Ω,

11: 400

(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 (Recommended for most cases. Clamp level

can be set automatically depending LNA gain. 350mVpp when

LNA = 24dB, 600mVpp when LNA = 18dB, 1.15Vpp when

LNA = 12dB)

01: 1.5Vpp,

10: 1.15Vpp,

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. Please see the

explanation for this function in the following section

52[14:13]

0x34[14:1

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

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