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LM97937RMER bảng dữ liệu(PDF) 5 Page - Texas Instruments

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tên linh kiện LM97937RMER
Giải thích chi tiết về linh kiện  Dual 370 MSPS Receiver and Feedback IC With SNRBoost, Bit-Burst, and JESD204B Outputs
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Trang chủ  http://www.ti.com
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AGND
VA3.3
+
-
SYSREF+
SYSREF-
1k:
0.5V
1k:
10k:
AGND
VA1.2
AGND
VA3.3
+
-
CLKIN+
CLKIN-
50:
0.5V
50:
10k:
AGND
VA1.2
VCM
VA3.3
+
-
+
-
AGND
VA3.3
VIN+
VIN-
+ -
VCM
100
Ÿ
100
Ÿ
LM97937
www.ti.com
SNVS990A – DECEMBER 2013 – REVISED JANUARY 2014
PIN DESCRIPTION
PIN
NAME
TYPE/DIAGRAM
DESCRIPTION
Differential analog input pins of channel A.
Each input pin is terminated to the internal
4,5
VINA+, VINA–
common mode reference with a resistor for
an internal differential termination.
Differential analog input pins of channel B.
Each input pin is terminated to the internal
11,10
VINB+, VINB–
common mode reference with a resistor for
an internal differential termination.
Input interface common mode voltage for
channels A and B.
These pins must be bypassed to AGND with
low ESL (equivalent series inductance) 0.1
μF capacitors. One should be placed as
close to the pin as possible and additional
capacitors placed at the bias load points. 10
μF capacitors should also be placed in
1,14
VCMA, VCMB
parallel. It is recommended to use VCMA
and VCMB to provide the common mode
voltage for the differential analog inputs. The
input common mode bias is provided
internally for the ADC input, therefore
external use of VCMA and VCMB is
recommended but not strictly required. The
recommended bypass capacitors are always
required.
Differential device clock input pins.
Each pin is internally terminated to a DC
bias with a 50
Ω resistor for a 100 Ω total
internal differential termination. AC coupling
17,18
CLKIN+, CLKIN–
is required for coupling the clock input to
these pins if the clock driver cannot meet the
common-mode requirements. Sampling
occurs on the rising edge of the differential
signal (CLKIN+)
− (CLKIN–).
Differential SYSREF signal input pins.
Each pin is internally terminated to a DC
bias with a 1 k
Ω resistor. An external 100 Ω
differential termination must always be
provided. AC coupling using capacitors is
23,24
SYSREF+, SYSREF–
required for coupling the SYSREF signal to
these pins if the clock driver cannot meet the
common-mode requirements. In the case of
AC coupling, the termination must be placed
on the source side of the coupling
capacitors.
Copyright © 2013–2014, Texas Instruments Incorporated
Submit Documentation Feedback
5
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