参数资料
型号: AD602AR-REEL7
厂商: Analog Devices Inc
文件页数: 16/33页
文件大小: 0K
描述: IC AMP VGA DUAL LN 50MA 16SOIC
标准包装: 250
系列: X-AMP®
放大器类型: 可变增益
电路数: 2
转换速率: 275 V/µs
-3db带宽: 35MHz
电流 - 输入偏压: 350nA
电流 - 电源: 11mA
电流 - 输出 / 通道: 50mA
电压 - 电源,单路/双路(±): ±4.75 V ~ 5.25 V
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 16-SOIC(0.295",7.50mm 宽)
供应商设备封装: 16-SOIC W
包装: 带卷 (TR)
AD600/AD602
Rev. F | Page 22 of 32
C1HI
A1CM
A1OP
VPOS
VNEG
A2OP
A2CM
C2HI
C1LO
A1HI
A1LO
GAT1
GAT2
A2LO
A2HI
C2LO
+5V
DEC
–5V
DEC
–5V
DEC
C5
22F
+5V DEC
R11
46.4k
R10
3.16k
U3C
INPUT
1V rms
MAX
(SINE WAVE)
U3A
1/4
AD713
C2
0.1F
NC = NO CONNECT
R6
10k
R7
127
R8
127
R9
10k
+5V
–5V
C1HI
A1CM
A1OP
VPOS
VNEG
A2OP
A2CM
C2HI
C1LO
A1HI
A1LO
GAT1
GAT2
A2LO
A2HI
C2LO
C1
0.1F
C3
220pF
R4
133k
R5
1.58k
R2
487
R3
200
R1
133k
–2dB
–62.5mV
0dB
+2dB
+62.5mV
C6
4.7F
+316.2mV
R16
6.65k
R15
19.6k
+5V DEC
R13
3.01k
R12
11.3k
R14
301k
Q1
2N3906
1
2
3
4
5
6
7
14
13
12
11
10
9
8
U4
AD636
FB
+5V
–5V
+5V
DEC
–5V
DEC
0.1F
POWER SUPPLY
DECOUPLING
NETWORK
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
REF
A1
A2
+
+
U1 AD600
REF
A1
A2
+
+
U2 AD600
VOUT
+5V
DEC
–5V
DEC
1/4
AD713
VLOG
U3B
1/4
AD713
C4
2F
00
53
8-
04
5
VIN
–VS
CAV
dB
BUF OUT
BUF IN
NC
+VS
COM
RL
IOUT
NC
5
3
–5
1
10
1
100m
10m
1m
100
4
2
0
1
–1
–3
–2
–4
INPUT SIGNAL (V rms)
L
O
G
ARI
T
H
M
IC
O
UT
P
UT
(
V
)
Figure 47. RMS Responding AGC Circuit with 100 dB Dynamic Range
100 dB RMS/AGC SYSTEM WITH MINIMAL GAIN
ERROR (PARALLEL GAIN WITH OFFSET)
Figure 47 shows an rms-responding AGC circuit that can be
used equally well as an accurate measurement system. It accepts
inputs of 10 μV to 1 V rms (100 dBV to 0 dBV) with generous
overrange. Figure 48 shows the logarithmic output, VLOG, which
is accurately scaled 1 V per decade, that is, 50 mV/dB, with an
intercept (VLOG = 0) at 3.16 mV rms (50 dBV). Gain offsets of
±2 dB were introduced between the amplifiers, provided by the
±62.5 mV introduced by R6 to R9. These offsets cancel a small
gain ripple that arises in the X-AMP from its finite interpolation
error, which has a period of 18 dB in the individual VCA
sections. The gain ripple of all three amplifier sections without
this offset (in which case, the gain errors simply add) is shown
in Figure 49; it is still a remarkably low ±0.25 dB over the
108 dB range from 6 μV to 1.5 V rms. However, with the gain
offsets connected, the gain linearity remains under ±0.1 dB over
the specified 100 dB range (see Figure 50).
0
053
8-
0
46
Figure 48. VLOG Plotted vs. VIN for Figure 47’s Circuit Showing 120 dB AGC Range
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