ADL5306ACP-REEL7 Analog Devices Inc, ADL5306ACP-REEL7 Datasheet - Page 13

• Manufacturer Part Number: ADL5306ACP-REEL7
• Description: IC LOGARITHMIC CONV 60DB 16LFCSP
• Manufacturer: Analog Devices Inc
• Type: Logarithmic Converterr

Specifications of ADL5306ACP-REEL7

• Rohs Status: RoHS non-compliant
• Design Resources: Interfacing ADL5315 to Translinear Logarithmic Amplifier (CN0056) Interfacing ADL5317 High Side Current Mirror to a Translinear Logarithmic Amplifier in an Avalanche Photodiode Power Detector
• Applications: Fiber Optics
• Mounting Type: Surface Mount
• Package / Case: 16-LFCSP

Figure 26 shows the configuration used for frequency response
measurements of the logarithmic amplifier section. The
AD8138 output is offset to 1.5 V dc and modulated to a depth
of 5% at frequency. R1 is chosen (over a wide range of values up
to 1.0 GΩ) to provide I
Figure 26. Configuration for Logarithmic Amplifier Bandwidth Measurement
ALKALINE
"D" CELL
Figure 27. Configuration for Noise Spectral Density Measurement
+IN
EVALUATION
AD8138
SOURCE TRIGGER CHANNEL 1 CHANNEL 2
BOARD
R1
SPLITTER
B
A
1k Ω
OUTPUT INPUT R INPUT A INPUT B
POWER
1nF
200k Ω
HP89410A
1nF
1kΩ
R1
PD
NETWORK ANALYZER
1k Ω
1nF
. The buffer is used to deload VLOG.
1
2
3
4
HP3577A
R2
COMM
NC
VREF
IREF
INPT
VSUM
1kΩ
1nF
16
5
1
2
3
4
COMM
ADL5306
VNEG
COMM
NC
VREF
IREF
INPT
VSUM
15
6
16
5
VNEG
COMM
COMM
14
ADL5306
VNEG
7
15
0.1 µ F
6
VOUT
VLOG
SCAL
VPOS
COMM
13
BFIN
VNEG
COMM
8
14
7
12
11
10
9
ALKALINE
"D" CELL
VOUT
VLOG
SCAL
VPOS
COMM
13
BFIN
8
0.1 µ F
03727-0-027
12
11
10
03727-0-026
9
+V
S
Rev. 0 | Page 13 of 16
The configuration of Figure 27 is used to measure the noise
performance. Batteries provide both the supply voltage and the
input current in order to minimize the introduction of spurious
noise and ground loop effects. The entire evaluation system,
including the current setting resistors, is mounted in a closed
aluminum enclosure to provide additional shielding to external
noise sources.
Figure 28 shows the setup used to make the pulse response
measurements. As with the bandwidth measurement, VLOG is
connected directly to BFIN and the buffer amplifier is
configured for a gain of 1. The buffer’s output is connected
through a short cable to the TDS5104 scope, with the input
impedance set to 1 MΩ. The LeCroy’s output is offset to create
the initial pedestal current for a given R1 value. The pulse then
creates a 1-decade current step.
LeCROY 9210
Figure 28. Configuration for Logarithmic Amplifier Pulse Response
9213
50kΩ
R1
CH A
1kΩ
1nF
200kΩ
1kΩ
1nF
Measurement
1
2
3
4
COMM
NC
VREF
IREF
INPT
VSUM
16
5
COMM
ADL5306
VNEG
15
6
TDS5104
VNEG
COMM
14
7
VOUT
VLOG
SCAL
VPOS
COMM
13
BFIN
8
ADL5306
0.1µF
12
11
10
9
+V
S
03727-0-028
CH 1