參數(shù)資料
型號: LTC2164IUK#PBF
廠商: LINEAR TECHNOLOGY CORP
元件分類: ADC
英文描述: 1-CH 16-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, PQCC48
封裝: 7 X 7 MM, LEAD FREE, PLASTIC, MO-220WKKD-2, QFN-48
文件頁數(shù): 14/36頁
文件大?。?/td> 663K
代理商: LTC2164IUK#PBF
LTC2165/LTC2164/LTC2163
21
216543f
applicaTions inForMaTion
Figure 8a. Reference Circuit
VREF
REFH
SENSE
C1
TIE TO VDD FOR 2V RANGE;
TIE TO GND FOR 1V RANGE;
RANGE = 1.6 VSENSE FOR
0.625V < VSENSE < 1.300V
1.25V
REFL
INTERNAL ADC
HIGH REFERENCE
BUFFER
2165 F08
LTC2165
5
0.8x
DIFF AMP
INTERNAL ADC
LOW REFERENCE
C1: 2.2F LOW INDUCTANCE
INTERDIGITATED CAPACITOR
TDK CLLE1AX7S0G225M
MURATA LLA219C70G225M
AVX W2L14Z225M
OR EQUIVALENT
1.25V BANDGAP
REFERENCE
0.625V
RANGE
DETECT
AND
CONTROL
2.2F
C2
0.1F
C3
0.1F
+
+
Reference
The LTC2165/LTC2164/LTC2163 has an internal 1.25V
voltage reference. For a 2V input range using the internal
reference, connect SENSE to VDD. For a 1V input range
using the internal reference, connect SENSE to ground.
For a 2V input range with an external reference, apply a
1.25V reference voltage to SENSE (Figure 9).
The input range can be adjusted by applying a voltage to
SENSE that is between 0.625V and 1.30V. The input range
will then be 1.6 VSENSE.
The VREF, REFH and REFL pins should be bypassed as
shown in Figure 8a. A low inductance 2.2F interdigitated
capacitor is recommended for the bypass between REFH
and REFL. This type of capacitor is available at a low cost
from multiple suppliers.
At sample rates below 110Msps an interdigitated capaci-
tor is not necessary for good performance and C1 can
be replaced by a standard 2.2F capacitor between REFH
and REFL. The capacitor should be as close to the pins
as possible (not on the back side of the circuit board).
Figure 8b. Alternative REFH/REFL Bypass Circuit
Figure 8c. Recommended Layout for the REFH/REFL
Bypass Circuit in Figure 8a
Figure 8d. Recommended Layout for the REFH/REFL
Bypass Circuit in Figure 8b
REFH
REFL
2165 F08b
LTC2165
CAPACITORS ARE 0402 PACKAGE SIZE
C3
0.1F
C1
2.2F
C2
0.1F
Figures 8c and 8d show the recommended circuit board
layout for the REFH/REFL bypass capacitors. Note that in
Figure 8c, every pin of the interdigitated capacitor (C1)
is connected since the pins are not internally connected
in some vendors’ capacitors. In Figure 8d, the REFH and
REFL pins are connected by short jumpers in an internal
layer. To minimize the inductance of these jumpers they
can be placed in a small hole in the GND plane on the
second board layer.
Figure 9. Using an External 1.25V Reference
SENSE
1.25V
EXTERNAL
REFERENCE
2.2F
1F
VREF
2165 F09
LTC2165
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