AFE5807 datasheet(37/75 Pages) TI1

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AFE5807

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SLOS703C – SEPTEMBER 2010 – REVISED MAY 2013

Table 4. VCA Register Map (continued)

ADDRESS ADDRESS Default

FUNCTION

DESCRIPTION

(DEC)

(HEX)

Value

57[1:0]

0x39[1:0]

CH1_LNA_GAIN_CNTL

00: 18dB;

01: 24dB;

57[3:2]

0x39[3:2]

10: 12dB;

CH2_LNA_GAIN_CNTL

11: Reserved

REG52[15] should be set as '1'

57[5:4]

0x39[5:4]

CH3_LNA_GAIN_CNTL

00: 18dB;

01: 24dB;

57[7:6]

0x39[7:6]

CH4_LNA_GAIN_CNTL

10: 12dB;

57[9:8]

0x39[9:8]

CH5_LNA_GAIN_CNTL

11: Reserved

REG52[15] should be set as '1'

57[11:10]

0x39[11:1

CH6_LNA_GAIN_CNTL

57[13:12]

0x39[13:1

CH7_LNA_GAIN_CNTL

57[15:14]

0x39[15:1

CH8_LNA_GAIN_CNTL

59[3:2]

0x3B[3:2]

HPF_LNA

00: 100KHz;

01: 50Khz;

10: 200Khz;

11: 150KHz with 0.015uF on INMx

59[6:4]

0x3B[6:4]

DIG_TGC_ATT_GAIN

000: 0dB attenuation;

001: 6dB attenuation;

N: ~N×6dB attenuation when 59[7] = 1

59[7]

0x3B[7]

DIG_TGC_ATT

0: disable digital TGC attenuator;

1: enable digital TGC attenuator

59[8]

0x3B[8]

CW_SUM_AMP_PDN

0: Power down;

1: Normal operation

Note: 59[8] is only effective in TGC test mode.

59[9]

0x3B[9]

PGA_TEST_MODE

0: Normal CW operation;

1: PGA outputs appear at CW outputs

VCA Register Description

LNA Input Impedances Configuration (Active Termination Programmability)

Different LNA input impedances can be configured through the register 52[4:0]. By enabling and disabling the

feedback resistors between LNA outputs and ACTx pins, LNA input impedance is adjustable accordingly. Table 5

describes the relationship between LNA gain and 52[4:0] settings. The input impedance settings are the same for

both TGC and CW paths.

The AFE5807 also has 4 preset active termination impedances as described in 52[7:6]. An internal decoder is

used to select appropriate resistors corresponding to different LNA gain.

Table 5. Register 52[4:0] Description

52[4:0]/0x34[4:0]

FUNCTION

00000

No feedback resistor enabled

00001

Enables 450

Ω feedback resistor

00010

Enables 900

Ω feedback resistor

00100

Enables 1800

Ω feedback resistor

01000

Enables 3600

Ω feedback resistor

10000

Enables 4500

Ω feedback resistor

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