AD600ARZ-R7 Просмотр технического описания (PDF) - Analog Devices
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AD600ARZ-R7 Datasheet PDF : 32 Pages
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AD600/AD602
INPUT
1V rms
MAX
(SINE WAVE)
C1LO
1
A1HI
2+
A1LO
3–
GAT1
4
GAT2
5
A1
REF
A2LO 6 –
A2HI
A2
7+
C2LO
8
U1 AD600
C1HI
16
A1CM
15
A1OP
14
VPOS
13
VNEG
12
A2OP
11
A2CM
10
C2HI
9
+5V
DEC
–5V
DEC
C1
0.1µF
R1
133kΩ
R2
487Ω
U3A
1/4
AD713
R3
200Ω
C2
0.1µF
R5
1.58kΩ
R4
133kΩ
C3
220pF
U3B
1/4
AD713
C1LO
1
A1HI 2 +
A1LO
3–
GAT1
4
GAT2
5
A1
REF
A2LO 6 –
A2HI
A2
7+
C2LO
8
U2 AD600
C1HI
16
A1CM
15
A1OP
14
VPOS
13
VNEG
12
11 A2OP
A2CM
10
9 C2HI
C4
2µF
+5V
DEC
–5V
DEC
VOUT
R13
3.01kΩ
+5V
FB
+5V
DEC
–5V
DEC
FB
0.1µF
0.1µF
–5V
POWER SUPPLY
DECOUPLING
NETWORK
R14
301kΩ
Q1
2N3906 R12
11.3kΩ
–2dB
–62.5mV 0dB
+2dB
+62.5mV
–5V
R6
10kΩ
R7
127Ω
+5V
R8
R9
127Ω 10kΩ
C5
22µF
+5V DEC
+5V DEC
R15
19.6kΩ
R16
6.65kΩ
–5V
DEC
1 VIN U4 +VS 14
2
AD636
NC
NC
13
3 –VS
4 CAV
NC 12
NC 11
5 dB
COM 10
6 BUF OUT RL 9
7 BUF IN IOUT 8
R10
3.16kΩ
+316.2mV
R11
46.4kΩ
C6
4.7µF
U3C
1/4
AD713
NC = NO CONNECT
VLOG
Figure 47. RMS Responding AGC Circuit with 100 dB Dynamic Range
100 dB RMS/AGC SYSTEM WITH MINIMAL GAIN
5
ERROR (PARALLEL GAIN WITH OFFSET)
4
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).
3
2
1
0
–1
–2
–3
–4
–5
1µ
10µ 100µ 1m 10m 100m
1
10
INPUT SIGNAL (V rms)
Figure 48. VLOG Plotted vs. VIN for Figure 47’s Circuit Showing 120 dB AGC Range
Rev. F | Page 22 of 32
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