AD603ARZ Analog Devices Inc, AD603ARZ Datasheet - Page 11

• Manufacturer Part Number: AD603ARZ
• Description: IC AMP VGA 90MHZ LN 50MA 8SOIC
• Manufacturer: Analog Devices Inc
• Series: X-AMP®r
• Type: Var Gain Ampr

Specifications of AD603ARZ

• Amplifier Type: Variable Gain
• Number Of Circuits: 1
• Slew Rate: 275 V/µs
• -3db Bandwidth: 90MHz
• Current - Input Bias: 200nA
• Current - Supply: 12.5mA
• Current - Output / Channel: 50mA
• Voltage - Supply, Single/dual (±): 9.5 V ~ 12.6 V, ±4.75 V ~ 6.3 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 8-SOIC (3.9mm Width)
• No. Of Amplifiers: 1
• Bandwidth: 90MHz
• Gain Accuracy: 1.5dB
• No. Of Channels: 1
• Supply Voltage Range: ± 4.75V To ± 6.3V
• Amplifier Case Style: SOIC
• No. Of Pins: 8
• Number Of Channels: 1
• Number Of Elements: 2
• Power Supply Requirement: Dual
• Voltage Gain Db: 31.3dB
• Input Resistance: 0.000103@±5VMohm
• Input Bias Current: 0.2@±5VnA
• Single Supply Voltage (typ): Not RequiredV
• Dual Supply Voltage (typ): ±5V
• Power Dissipation: 400mW
• Rail/rail I/o Type: No
• Single Supply Voltage (min): Not RequiredV
• Single Supply Voltage (max): Not RequiredV
• Dual Supply Voltage (min): ±4.75V
• Dual Supply Voltage (max): ±6.3V
• Operating Temp Range: -40C to 85C
• Operating Temperature Classification: Industrial
• Mounting: Surface Mount
• Pin Count: 8
• Package Type: SOIC N
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: AD603-EVALZ - BOARD EVALUATION FOR AD603
• Output Type: -
• Gain Bandwidth Product: -
• Voltage - Input Offset: -
• Lead Free Status / Rohs Status: Compliant

Parallel Mode (Simplest Gain-Control Interface)
In this mode, the gain-control of voltage is applied to both inputs
in parallel—the GPOS pins of both A1 and A2 are connected to
the control voltage and the GNEW inputs are grounded. The
gain scaling is then doubled to 80 dB/V, requiring only a 1.00 V
change for an 80 dB change of gain:
where, as before, G
ample, in the maximum bandwidth mode, G
Alternatively, the GNEG pins may be connected to an offset
voltage of 0.500 V, in which case, G
The amplitude of the gain ripple in this case is also doubled, as
shown in Figure 11, while the instantaneous signal-to-noise ratio
at the output of A2 now decreases linearly as the gain increased,
as shown in Figure 12.
REV. E
Figure 9. SNR for Cascaded Stages—Sequential Control
–0.5
–1.0
–1.5
–2.0
2.0
1.5
1.0
0.5
0.0
Figure 10. Gain Error for Cascaded Stages—
Sequential Control
90
80
70
60
50
40
30
20
10
–0.2
–0.2
Gain (dB) = 80 V
0.0 0.2
0.2
O
depends on the range selected; for ex-
0.4 0.6
0.6
0.8
G
1.0
1.0
V
V
+ G
C
C
1.2 1.4
O
O
is –20 dB.
1.4
1.6 1.8
O
is +20 dB.
1.8
2.0 2.2
2.2
(4)
–11–
Low Gain Ripple Mode (Minimum Gain Error)
As can be seen from Figures 9 and 10, the error in the gain is
periodic, that is, it shows a small ripple. (Note that there is also
a variation in the output offset voltage, which is due to the gain
interpolation, but this is not exact in amplitude.) By offsetting
the gains of A1 and A2 by half the period of the ripple, that is,
by 3 dB, the residual gain errors of the two amplifiers can be
made to cancel. Figure 13 shows that much lower gain ripple
when configured in this manner. Figure 14 plots the ISNR as a
function of gain; it is very similar to that in the parallel mode.
Figure 12. ISNR for Cascaded Stages—Parallel Control
–0.5
–1.0
–1.5
–2.0
Figure 11. Gain Error for Cascaded Stages—
Parallel Control
2.0
1.5
1.0
0.5
0.0
90
85
80
75
70
65
60
55
50
–0.2
–0.2
0.0 0.2
0
0.4 0.6
0.2
0.8
0.4
1.0
V
V
C
C
1.2 1.4
0.6
0.8
1.6 1.8
AD603
1.0
2.0 2.2
1.2