AFE5807 datasheet(39/75 Pages) TI1

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AFE5807

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SLOS703C – SEPTEMBER 2010 – REVISED MAY 2013

Programmable Gain for CW Summing Amplifier

Different gain can be configured for the CW summing amplifier through the register 54[4:0]. By enabling and

disabling the feedback resistors between the summing amplifier inputs and outputs, the gain is adjustable

accordingly to maximize the dynamic range of CW path. Table 7 describes the relationship between the summing

amplifier gain and 54[4:0] settings.

Table 7. Register 54[4:0] Description

54[4:0]/0x36[4:0]

FUNCTION

00000

No feedback resistor

00001

Enables 250

Ω feedback resistor

00010

Enables 250

Ω feedback resistor

00100

Enables 500

Ω feedback resistor

01000

Enables 1000

Ω feedback resistor

10000

Enables 2000

Ω feedback resistor

Table 8. Register 54[4:0] vs Summing Amplifier Gain

54[4:0]/0x36[4:0]

00000

00001

00010

00011

00100

00101

00110

00111

CW I/V Gain

N/A

0.50

0.25

1.00

0.33

0.20

54[4:0]/0x36[4:0]

01000

01001

01010

01011

01100

01101

01110

01111

CW I/V Gain

2.00

0.40

0.22

0.67

0.29

0.18

54[4:0]/0x36[4:0]

10000

10001

10010

10011

10100

10101

10110

10111

CW I/V Gain

4.00

0.44

0.24

0.80

0.31

0.19

54[4:0]/0x36[4:0]

11000

11001

11010

11011

11100

11101

11110

11111

CW I/V Gain

1.33

0.36

0.21

0.57

0.27

0.17

Programmable Phase Delay for CW Mixer

Accurate CW beamforming is achieved through adjusting the phase delay of each channel. In the AFE5807, 16

different phase delays can be applied to each LNA output; and it meets the standard requirement of typical

ultrasound beamformer, i.e.

beamformer resolution. Table 7 describes the relationship between the phase

delays and the register 55 and 56 settings.

Table 9. CW Mixer Phase Delay vs Register Settings

CH1 - 55[3:0], CH2 - 55[7:4], CH3 - 55[11:8], CH4 - 55[15:12],

CH5- 56[3:0], CH6 - 56[7:4], CH7 - 56[11:8], CH8 - 56[15:12],

CHX_CW_MIXER_PHASE

0000

0001

0010

0011

0100

0101

0110

0111

PHASE SHIFT

22.5°

45°

67.5°

90°

112.5°

135°

157.5°

CHX_CW_MIXER_PHASE

1000

1001

1010

1011

1100

1101

1110

1111

PHASE SHIFT

180°

202.5°

225°

247.5°

270°

292.5°

315°

337.5°

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