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

VCA8500
SBOS390 – JANUARY 2008
C₁₆
1mF
IN8
C₁₅
1mF
IN7
+3.3V
C₁₄
1mF
IN6
C₃
0.1mF
C₁₃
1mF
IN5
C₂₂
2.2mF
TYPICAL CONNECTION DIAGRAM
+5V
C₂₅
2.2mF
C₂₄
2.2mF
C₂₃
2.2mF
C₃₆
2.2mF
C₁₄
0.1mF
C₃₅
2.2mF
C₃₄
2.2mF
C₃₃
2.2mF
C₃₂
2.2mF
C₃₁
2.2mF
C₇
0.1mF
+3.3V
+3.3VD
+3.3V
PD
WC0
CW1
CW2
CW3
CW4
DD4
CLK
DOUT
RST
C₁
0.1mF
CW5
CW6
CW7
CW8
CW9
49
PD
50
CW0
51
CW1
52
CW2
53
CW3
54
CW4
55
D_IN
56
CLK
57
D_OUT
58
RST
59
DVDD
60 _CW5
61
CW6
62
CW7
63
CW8
64
CW9
Flag
PAD
C₁₀
2.2mF
C₉
1mF
IN1
C₁₇
C₂
C₁₀
2.2mF 0.1mF
1mF
IN2
C₁₁
1mF
IN3
C₁₂
1mF
IN4
C₁₉
2.2mF
C₂₀
2.2mF
C₂₁
2.2mF
VCA8500
OUT_QFN_RGC-64
R₁
1kW
+5V
C₄
0.1mF
32
OUT8
31
OUT8
30
OUT7
29
OUT7
28
OUT6
27
OUT6
26
OUT5
25
OUT5
24
OUT1
23
OUT1
22
OUT2
OUT2 ²¹
20
OUT3
19
OUT3
18
OUT4
17
OUT4
+3.3V C₆
0.1mF
C₃₀
2.2mF
C₂₉
2.2mF
C₂₈
2.2mF
C₂₇
2.2mF
C₂₆
2.2mF
C₅
0.1mF
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R₁₇
0W
OUT8P
R₁₆
0W
C₄₄
OUT8N
R₁₅
0W
OUT7P
R₁₄
C₄₃
0W
OUT7N
R₁₃
0W
OUT6P
R₁₂
0W
C₄₂
OUT6N
R₁₁
0W
OUT5P
R₁₀
C₄₁
0W
OUT5N
R₂
0W
OUT1P
R₃
C₃₇
0W
OUT1N
R₄
0W
OUT2P
R₅
C₃₈
0W
OUT2N
R₆
0W
OUT3P
R₇
C₃₉
0W
OUT3N
R₈
0W
OUT4P
R₉
0W
C₄₀
OUT4N
NOTES:
(1) V_CONTROL: Values for R₁ and C₄ should be selected for a desired time constant.
(2) Outputs: Values for R₂ – R₁₇ and C₃₇ – C₄₄ should be selected based on the analog-to-digital converter selected.
(3) The +3.3V supply connections for DVDD and AVDD1 should be joined to a low-noise +3.3V system supply. Consider filtering any supply
noise with an LC filter.
8
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