VCA8500 Datasheet, PDF (10/15 Pages) Texas Instruments – 8-Channel, Ultra-Low Power Variable Gain Amplifier with Low-Noise Pre-Amp

VCA8500
SBOS390 – JANUARY 2008
BIT #
D24 (LSB)
D25
D26
D27
D28
D29
D30
D31 (MSB)
NAME
DB5:1
DB5:2
DB5:3
DB5:4
DB6:1
DB6:2
DB6:3
DB6:4
Table 5. Byte 4—Third Data Byte
DESCRIPTION
Channel 5; LSB of Matrix Control
Channel 5, Matrix Control
Channel 5, Matrix Control
Channel 5, MSB of Matrix Control
Channel 6; LSB of Matrix Control
Channel 6, Matrix Control
Channel 6, Matrix Control
Channel 6, MSB of Matrix Control
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BIT #
D32 (LSB)
D33
D34
D35
D36
D37
D38
D39 (MSB)
NAME
DB7:1
DB7:2
DB7:3
DB7:4
DB8:1
DB8:2
DB8:3
DB8:4
Table 6. Byte 5—Fourth Data Byte
DESCRIPTION
Channel 7; LSB of Matrix Control
Channel 7, Matrix Control
Channel 7, Matrix Control
Channel 7, MSB of Matrix Control
Channel 8; LSB of Matrix Control
Channel 8, Matrix Control
Channel 8, Matrix Control
Channel 8, MSB of Matrix Control
NAME
BW
CL
SETTING
D3 = 0
D3 = 1
D4 = 0
D4 = 1
Table 7. Clamp Level and LPF Bandwidth Setting
FUNCTION
Bandwidth set to 10 MHz
Bandwidth set to 15 MHz
Clamps the output signal at 2 dB below the full-scale of 2 V_PP (1.6 V_PP) on each PGA output
channel
Clamp transparent (disabled)
Table 8. PGA Gain Setting
PG1
0
0
1
1
PG0
0
1
0
1
FUNCTION
Set PGA gain to 20dB
Set PGA gain to 25dB
Set PGA gain to 27dB
Set PGA gain to 30dB
10
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