AD600JR-REEL7 Analog Devices Inc, AD600JR-REEL7 Datasheet - Page 24

• Manufacturer Part Number: AD600JR-REEL7
• Description: IC AMP VGA DUAL LN 50MA 16SOIC
• Manufacturer: Analog Devices Inc
• Series: X-AMP®r

Specifications of AD600JR-REEL7

• Rohs Status: RoHS non-compliant
• Amplifier Type: Variable Gain
• Number Of Circuits: 2
• Slew Rate: 275 V/µs
• -3db Bandwidth: 35MHz
• Current - Input Bias: 350nA
• Current - Supply: 11mA
• Current - Output / Channel: 50mA
• Voltage - Supply, Single/dual (±): ±4.75 V ~ 5.25 V
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 16-SOIC (0.300", 7.5mm Width)
• Output Type: -
• Gain Bandwidth Product: -
• Voltage - Input Offset: -

AD600/AD602
Figure 51 shows the circuit for the sequential control scheme.
R6 to R9 with R16 provide offsets of 42.14 dB between the
individual amplifiers to ensure smooth transitions between the
gain of each successive X-AMP, with the sequence of gain
increase being U1A, then U1B, and then U2A. The adjustable
attenuator provided by R3 + R17 and the 100 Ω input resistance
of U1A, as well as the fixed 6 dB attenuation provided by R2
and the input resistance of U1B, are included both to set V
INPUT
115Ω
R17
DEC
DEC
+6V
–6V
ADJUST
POWER SUPPLY
DECOUPLING
200Ω
0dB
R3
FB
FB
NETWORK
–6V
+6V
0.1µF
0.1µF
C1LO
A1LO
A2LO
C2LO
GAT1
GAT2
A1HI
A2HI
1
2
3
4
5
6
7
8
+
–
–
+
U1 AD600
Figure 51. 120 dB Dynamic Range RMS Responding Circuit Optimized for SNR
+6V DEC
A1
A2
REF
R15
5.11kΩ
R14
7.32kΩ
16
15
14
13
12
11
10
9
+6V
A1OP
VPOS
VNEG
A2OP
A2CM
C2HI
C1HI
A1CM
866Ω
R13
3.4kΩ
R6
+6V
DEC
–6V
DEC
LOG
R12
1kΩ
Rev. E | Page 24 of 28
0.1µF
0.1µF
133kΩ
133kΩ
1kΩ
to
C1
C2
R7
R1
R4
294Ω
5.36kΩ
R8
R5
0.001µF
U3A
C3
AD713
DEC
1kΩ
R9
–6V
read 0 dB when V
range between 10 μV rms and 1 V rms input. R5 and C3
provide a 3 dB noise bandwidth of 30 kHz. R12 to R15 change
the scaling from 625 mV/decade at the control inputs to
1 V/decade at the output. At the same time, R12 to R15 center
the dynamic range at 60 dB, which occurs if the V
equal to 0. These arrangements ensure that the V
within the ±6 V supplies.
1/4
NC
NC
NC
287Ω
R16
100Ω
R2
U3B
1
2
3
4
5
6
7
AD713
1/4
VINP
VNEG
CAVG
VLOG
BFOP
BFIN
AD636
22µF
C5
U4
COMM
VPOS
LDLO
V
A1LO
C1LO
A2LO
C2LO
RMS
GAT1
A1HI
GAT2
A2HI
IN
is 3.16 mV rms and to center the 100 dB
14
13
12
11
10
9
8
1
2
3
4
5
6
7
8
NC
NC
NC
+
–
–
+
+316.2mV
U2 AD600
3.16kΩ
R10
NC = NO CONNECT
A1
A2
REF
R11
56.2kΩ
U3C
4.7µF
AD713
C6
+6V DEC
1/4
16
15
14
13
12
11
10
9
C1HI
A1CM
VPOS
A2OP
A2CM
C2HI
VNEG
A1OP
LOG
+5V
DEC
–5V
DEC
G
2µF
C4
V
of U1B is
LOG
still fits
V
OUT