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| 型號(hào)： | ADL5304ACPZ-R7 |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 16/32頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC AMP LOG CONV 32LFCSP |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 類型： | 對(duì)數(shù)轉(zhuǎn)換器 |
| 應(yīng)用： | 光纖 |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 32-VFQFN 裸露焊盤，CSP |
| 供應(yīng)商設(shè)備封裝： | 32-LFCSP-VQ（5x5） |
| 包裝： | 標(biāo)準(zhǔn)包裝 |
| 其它名稱： | ADL5304ACPZ-R7DKR |
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Data Sheet
ADL5304
Rev. 0 | Page 23 of 32
Table 4. VLOG Scaling Options
Option
Pin SCL1
Pin SCL2
Pin SCL3
Pin INPS
Pin INMS
VY (V/dec)
IZ (A)
VOFS (V)
Single-Supply Operation (VNEG = 0 V;
VSMx = DCBI = INPS = 1P5V)
11
VLOG
INMS
Open
1P5V
SCL2
0.2
3.16 f
1.5
2
VLOG
INMS
VLOG
1P5V
SCL2
0.15
0.01 f
1.5
3
VLOG
INMS
Ground
1P5V
SCL2
0.2
0.01 f
2.0
4
VLOG
Open
Ground
1P5V
Open
0.4
56.2 f
2.5
5
VLOG
Open
1P5V
Open
0.4
17.8 p
1.5
6
Open
VLOG
1P5V
Open
0.6
316 p
1.5
7
Open
VLOG
Open
1P5V
Open
0.8
1.33 n
1.5
8
VLOG
INMS
2VLT
1P5V
SCL2
0.2
21.6 f
1.333
Dual-Supply Operation (VNEG < 2 V;
VSMx = DCBI = INPS = Ground)
92
VLOG
INMS
Open
Ground
SCL2
0.2
100 n
0
10
VLOG
INMS
VLOG
Ground
SCL2
0.15
100 n
0
11
VLOG
Open
Ground
Open
0.4
100 n
0
12
Open
VLOG
Ground
Open
0.6
100 n
0
13
Open
VLOG
Open
Ground
Open
0.8
100 n
0
1 Default setup for single supply and VSMx = 1.5 V.
2 Default setup for dual supply and VSMx = ground.
The default setups are noted in Table 4.
Other intercepts are achieved by injecting different currents
into the IDEN pin, for example, if IDEN = 1 μA, as shown in
Figure 52, the VLOG transfer function is simply shifted by one
decade to the right. One way of doing this is to put a precision
500 kΩ resistor between the 2VLT and IDEN pins in the single-
supply default setup. The intercept is moved up to 31.62 fA, and
all output voltages for a given INUM are lowered by one decade,
that is, by 0.2 V at VLOG. For example, the new IDEN = 1 μA, and
VLOG = 1.3 V for INUM = 100 nA.
This is particularly useful if the slope is already as desired but
the desired intercept cannot be achieved with the on-chip
resistors. Only a shift toward the right makes sense because a
shift to the left requires excessively large resistors.
094
59-
061
MONITOR AND
PD BIAS
(1.1× INUM)
2
3
4
5
6
8
7
30
17
31
26
VSM1
VSM2
RMNTR
32
VSM4
VSM3
IREF
IDEN
INUM
100nA
Q2
Q1
Q3
1.5V
10
9
VDEN
INDN
IMON
2VLT
INNM
1P5V
1.5V
VREF
TEMP
COMP
VNUM
ILOG
VDEN
SHIELD
PD
500k
VNUM
Figure 52. Intercept Shifted One Decade Right via External Resistor,
Reference Current IDEN = 1 μA
Slope Inversion
Table 4 lists only those slopes that are positive because this is the
expected normal operation in measurement mode. The slopes can
be inverted by two methods. By using INUM = IREF = 100 nA, in
which case, the intercepts, IZ, are at larger currents mirrored from
the values shown in Table 4 around the 100 nA reference current.
For example, for the default setup with VY = 0.2 V/decade and
IZ = 3.162 fA, swapping INUM and IDEN connections result in
VY = 0.2 V/decade and IZ = 3.162 A.
The second method is to simply swap the connections between
the VNUM and VDEN pins and the inputs to the temperature
compensation cell (INNM and INDN), as shown in Figure 53
(compare to Figure 52). This technique is particularly useful if
both negative log slope and adaptive photodiode biasing via
IMON are desired together.
09459
-062
MONITOR AND
PD BIAS
(1.1× INUM)
2
3
4
5
6
8
30
31
VSM1
VSM2
VSM4
VSM3
RMNTR
32
IREF
IDEN
INUM
100nA
Q2
Q1
Q3
10
9
VDEN
INDN
IMON
VNUM
INNM
TEMP
COMP
VNUM
VDEN
SHIELD
PD
FROM
1.5V VREF
7
Figure 53. Simple Slope Inversion Method
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