AFE5807 datasheet(35/75 Pages) TI1

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AFE5807

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SLOS703C – SEPTEMBER 2010 – REVISED MAY 2013

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[7:5]

0x33[7:5]

PGA_CLAMP_LEVEL

Low power mode/medium power mode: 53[11:10]=00/10

100: –2 dBFS

110: 0 dBFS

0XX: Clamp is disabled

Low noise mode; 53[11:10]=01

000: –2 dBFS

010: 0 dBFS

1XX: clamp is disabled

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

range. For example, at 000 setting, PGA output HD3 will be

worsen by 3 dB at –2 dBFS ADC input. In normal operation,

clamp function can be set as 000 in the low noise mode. The

maximum PGA output level can exceed 2Vpp with the clamp

circuit enabled.

Note: in the low power and medium power modes,

PGA_CLAMP is disabled for saving power if 51[7]=0.

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: 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. 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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