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參數(shù)資料
| 型號： | MAX4207ETE+T |
| 廠商： | Maxim Integrated Products |
| 文件頁數(shù)： | 2/15頁 |
| 文件大小： | 0K |
| 描述： | IC AMP TRANS LOG 16-TQFN |
| 產(chǎn)品培訓(xùn)模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標(biāo)準(zhǔn)包裝： | 2,500 |
| 放大器類型： | 對數(shù) |
| 電路數(shù)： | 1 |
| 轉(zhuǎn)換速率： | 12 V/µs |
| 增益帶寬積： | 5MHz |
| -3db帶寬： | 1MHz |
| 電流 - 輸入偏壓： | 10pA |
| 電壓 - 輸入偏移： | 600µV |
| 電流 - 電源： | 5mA |
| 電流 - 輸出 / 通道： | 58mA |
| 電壓 - 電源，單路/雙路(±)： | 2.7 V ~ 11 V，±2.7 V ~ 5.5 V |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 16-WQFN 裸露焊盤 |
| 供應(yīng)商設(shè)備封裝： | 16-TQFN-EP（4x4） |
| 包裝： | 帶卷 (TR) |
MAX4207
Precision Transimpedance Logarithmic
Amplifier with Over 5 Decades of Dynamic Range
10
______________________________________________________________________________________
Total Error
Total error (TE) is defined as the deviation of the output
voltage, VLOGV1, from the ideal transfer function (see
the Transfer Function section):
TE is a combination of the associated gain, input offset
current, input bias current, output offset voltage, and
transfer characteristic nonlinearity (log conformity)
errors:
where VLC and VOSOUT are the log conformity and out-
put offset voltages, respectively. Output offset is defined
as the offset occurring at the output of the MAX4207
when equal currents are presented to ILOG and IREF.
Because the MAX4207 is configured with a gain of K =
-0.25V/decade, a 4 should multiply the (±VLC ±VOSOUT)
term, if VLC and VOSOUT were derived from this default
configuration.
IBIAS1 and IBIAS2 are currents in the order of 20pA, sig-
nificantly smaller than ILOG and IREF, and can therefore
be eliminated:
Expanding this expression:
The first term of this expression is the ideal component
of VLOGV1. The remainder of the expression is the TE:
In the second term, one can generally remove the
products relating to K, because K is generally much
less than 1. Hence, a good approximation for TE is
given by:
As an example, consider the following situation:
Full-scale input = 5V
ILOG = 100A
IREF = 100nA
K = 1 ±5% V/decade (note that the uncommitted ampli-
fier is configured for a gain of 4)
VLC = ±5mV (obtained from the Electrical Characteristics
table)
VOSOUT = ±2mV (typ), and TA = +25°C.
TE
K
I
VV
LOG
REF
LC
OSOUT
±
±±
±
()
log10
4
TE
K K
I
KK
V
LOG
REF
LC
OSOUT
±
±+
±
()
log
(
)
10
41
VK
I
KK
I
KK
V
LOGV
LOG
REF
LOG
REF
LC
OSOUT
210
10
41
±
±+
±
()
log
()
VK
K
I
VV
LOGV
LOG
REF
LC
OSOUT
210
14
±
±±
±
()
() log
VK
K
II
VV
LOGV
LOG
BIAS
REF
BIAS
LC
OSOUT
210
1
2
14
=±
±±
±
()
() log
-
VV
TE
LOGV
IDEAL
1 =±
IDEAL TRANSFER FUNCTION
WITH VARYING K
MAX4207
fig03
CURRENT RATIO (ILOG/IREF)
NORMALIZED
OUTPUT
VOLTAGE
(V)
100
110
0.1
0.01
-2
-3
-1
0
1
2
3
4
-4
0.001
1000
VOUT = K LOG (ILOG/IREF)
K = 1
K = 0.5
K = 0.25
K = -0.25
K = -0.5
K = -1
Figure 3. Ideal Transfer Function with Varying K
IDEAL TRANSFER FUNCTION
WITH VARYING IREF
MAX4207
fig04
ILOG (A)
OUTPUT
VOLTAGE
(V)
100
1
10
100n
10n
-1.0
-0.5
0
0.5
1.0
1.5
-1.5
1n
1m
K = -0.25
IREF = 100A
IREF = 10nA
IREF = 1A
Figure 4. Ideal Transfer Function with Varying IREF
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