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AD8332ARU-REEL Datasheet(PDF) 17 Page - Analog Devices

No. de pieza AD8332ARU-REEL
Descripción Electrónicos  Ultralow Noise VGAs with Preamplifier and Programmable RIN
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Fabricante Electrónico  AD [Analog Devices]
Página de inicio  http://www.analog.com
Logo AD - Analog Devices

AD8332ARU-REEL Datasheet(HTML) 17 Page - Analog Devices

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AD8331/AD8332
Rev. C | Page 17 of 32
THEORY OF OPERATION
OVERVIEW
The following discussion applies to all part numbers. Figure 56
and Figure 1 are functional block diagrams of the AD8331 and
AD8332, respectively.
LNA
2
1
6
3
LMD
INH
COML
VPSL
10
GAIN
COMM
LNA
BIAS
(VMID)
VGA
G = –48dB to 0dB
+21dB
BIAS AND
INTERPOLATOR
20
4
5
7
8
17
19
18
VMID
POST
AMP1
12
CLAMP
GAIN
INT
11
19
15
16
9
3.5dB/
15.5dB
ENBL
ENBV
RCLMP
VOH
VOL
MODE
LON LOP VIP VIN
VPOS
VCM
14
HILO
COMM
AD8331
Figure 56. Functional Block Diagram — AD8331
Each channel contains an LNA that provides user-adjustable
input impedance termination, a differential X-AMP VGA, and a
programmable gain postamplifier with adjustable output
voltage limiting. Figure 57 shows a simplified block diagram.
VOL
VOH
LNA
CLAMP*
+
INH
LMD
LOP
LON
HILO
VCM
PREAMPLIFIER
19dB
X-AMP VGA
POSTAMP
[(–48 to 0) + 21] dB
3.5dB/15.5dB
GAIN
INTERFACE*
GAIN
BIAS AND
INTERPOLATOR*
VIN
VIP
*SHARED BETWEEN CHANNELS
RCLMP
BIAS
(VMID)
VMID
Figure 57. Simplified Block Diagram
The linear-in-dB gain control interface is trimmed for slope and
absolute accuracy. The overall gain range is 48 dB, extending
from –4.5 dB to +43.5 dB or from +7.5 dB to +55.5 dB,
depending on the setting of the HILO pin. The slope of the gain
control interface is 50 dB/V, and the gain control range is 40 mV
to 1 V, leading to the following expressions for gain:
(
)
() ( )
1
,
5
6
50
)
(
LO
HILO
dB
.
V
V
dB
dB
GAIN
GAIN
=
×
=
or
(
)
() ( )
2
,
5
5
50
)
(
HI
HILO
dB
.
V
V
dB
dB
GAIN
GAIN
=
+
×
=
The gain characteristics are shown in Figure 58.
40
50
00.2
VGAIN (V)
0.6
0.4
30
10
0
20
–10
1.0
0.8
1.1
60
HILO = HI
HILO = LO
MODE = LO
MODE = HI
(WHERE AVAILABLE)
Figure 58. Gain Control Characteristics
When MODE is set high, (where available):
(
)
() ()
3
=
,
5
45
+
×
50
=
)
(
LO
HILO
dB
.
V
V
dB
dB
GAIN
GAIN
or
(
)
() ()
4
=
,
5
57
+
×
50
=
)
(
HI
HILO
dB
.
V
V
dB
dB
GAIN
GAIN
The LNA converts a single-ended input to a differential output
with a voltage gain of 19 dB. When only one output is used, the
gain is 13 dB. The inverting output is used for active input
impedance termination. Each of the LNA outputs is capacitively
coupled to a VGA input. The VGA consists of an attenuator
with a range of 48 dB followed by an amplifier with 21 dB of
gain, for a net gain range of –27 dB to +21 dB. The X-AMP
gain-interpolation technique results in low gain error and
uniform bandwidth, and differential signal paths minimize
distortion.
The final stage is a logic programmable amplifier with gains of
3.5 dB or 15.5 dB. The LO and HI gain modes are optimized
for 12-bit and 10-bit A/D converter applications, in terms of
output-referred noise and absolute gain range. Output voltage
limiting may be programmed by the user.
LOW NOISE AMPLIFIER (LNA)
Good noise performance relies on a proprietary ultralow noise
preamplifier at the beginning of the signal chain, which
minimizes the noise contribution in the following VGA. Active
impedance control optimizes noise performance for
applications that benefit from input matching.


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