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參數(shù)資料
| 型號(hào)： | ADL5317ACPZ-REEL7 |
| 廠商： | Analog Devices Inc |
| 文件頁(yè)數(shù)： | 11/16頁(yè) |
| 文件大?。?/td> | 541K |
| 描述： | IC CURRENT MONITOR 16LFCSP |
| 設(shè)計(jì)資源： | Interfacing ADL5317 High Side Current Mirror to a Translinear Logarithmic Amplifier in an Avalanche Photodiode Power Detector |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 功能： | 電流監(jiān)控器 |
| 檢測(cè)方法： | 高端 |
| 輸入電壓： | 10 V ~ 80 V |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 16-VFQFN 裸露焊盤，CSP |
| 供應(yīng)商設(shè)備封裝： | 16-LFCSP-VQ |
| 包裝： | 標(biāo)準(zhǔn)包裝 |
| 產(chǎn)品目錄頁(yè)面： | 772 (CN2011-ZH PDF) |
| 其它名稱： | ADL5317ACPZ-REEL7DKR |
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ADL5317
Rev. 0 | Page 11 of 16
APPLICATIONS
The ADL5317 is primarily designed for wide dynamic range
applications simplifying APD bias circuit architecture. Accurate
control of the bias voltage across the APD becomes critical to
maintain the proper avalanche multiplication factor as the
temperature and input power vary. Figure 21 shows how to use
the ADL5317 with an external temperature sensor to monitor
the ambient temperature of the APD. Using a look-up table and
DAC to drive VSET, it is possible to apply the correct VAPD for
the conditions. Note that Pin 9, Pin 10, and Pin 12 to Pin 15
were removed for simplification.
OVERCURRENT
PROTECTION
THERMAL
PROTECTION
COMM
FALT
VSET
VPLV
VPHV
VCLH
GARD VAPD
I
APD
IPDM
CURRENT
MIRROR
5:1
30 ?/SPAN> V
SET
I
APD
5
R
29 ?/SPAN> R
LOGIC
SUPPLY
LOOK-UP
TABLE
AND DAC
TEMPERATURE
SENSOR
5V
OPTICAL
POWER
TRANSLINEAR
LOG AMP
APD
TIA RECEIVER
75V
FROM DCDC
CONVERTER
DATA
C
GRD
Figure 21. Typical APD Biasing Application Using the ADL5317
In this application, the ADL5317 is operating in linear mode.
The bias voltage to the APD, delivered at Pin VAPD, is
controlled by the voltage (VSET) at Pin VSET. The bias voltage at
VAPD is equal to 30 ?VSET.
The range of voltages available at VAPD for a given high voltage
supply is limited to approximately 33 V (or less, for V
APD
< 41 V).
This is because the GARD and VAPD pins are clamped to within
~40 V below VPHV , preventing internal device breakdowns.
The input current, IAPD, is divided down by a factor of 5 and
precisely mirrored to Pin IPDM. This interface is optimized for
use with any of the Analog Devices translinear logarithmic
amplifiers (for example, the AD8304 or AD8305) to offer a
precise, wide dynamic range measurement of the optical power
incident upon the APD.
If a voltage output is preferred at IPDM, a single external
resistor to ground is all that is necessary to perform the
conversion. Voltage compliance at IPDM is limited to VPLV or
VAPD/3, whichever is lower.
SUPPLY TRACKING MODE
Some applications for the ADL5317 require a variable dc-to-dc
converter or alternative variable biasing sources to supply
VPHV. For these applications, it is necessary to configure the
ADL5317 for supply tracking mode, shown in Figure 22. In this
mode, the VSET interface is bypassed. However, the full
functionality of the precision current mirror remains available.
OVERCURRENT
PROTECTION
THERMAL
PROTECTION
FALT
VSET
VPLV
VPHV
VPHV
VCLH
GARD
VAPD
IPDM
CURRENT
MIRROR
5:1
30 ?/SPAN> V
SET
R
29 ?/SPAN> R
5V
COMM
16
COMM
15
COMM
14
COMM
13
1
2
3
4
5
6
7
8
11
10
9
NC
GARD
VARIABLE
DC SUPPLY
10V TO 77V
TIA
8V TO 75V
BIAS ACROSS APD
DATA
OUT
LOG
RSSI
3V TO 5.5
4V TO 6V
12
13
NC
Figure 22. Supply Tracking Mode
In supply tracking mode, the VSET amplifier is pulled up beyond
its linear operating range and effectively placed into a controlled
saturation. This is done by applying 3.0 V to 5.5 V at the VSET
pin. It is also necessary to remove the connection from VCLH,
which defines the saturation point, to VPHV. Once the ADL5317
is placed into supply tracking mode, V
APD
is clamped to 2.0 V
below V
PHV
.
For those designs where it is desirable to drive VSET from the
VPLV supply, it is necessary to place a 100 k?resistor between
VSET and VPLV for VPLV > 5.5 V. This is due to input current
limitations on the VSET pin.
TRANSLINEAR LOG AMP INTERFACING
The monitor current output, IPDM, of the ADL5317 is
designed to interface directly to an Analog Devices translinear
logarithmic amplifier, such as the AD8304, AD8305, or
ADL5306. Figure 23 shows the basic connections necessary for
interfacing the ADL5317 to the AD8305. In this configuration,
the designer is can use the full current mirror range of the
ADL5317 for high accuracy power monitoring.
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