參數(shù)資料
型號(hào)： 5962-8967601XX
廠商： CIRRUS LOGIC INC
元件分類： ADC
英文描述： 1-CH 16-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL/PARALLEL ACCESS, CQCC44
封裝： CERAMIC, LCC-44
文件頁(yè)數(shù)： 15/50頁(yè)
文件大?。?/td> 520K
代理商： 5962-8967601XX
Analog Input Range/Coding Format
The reference voltage directly defines the input
voltage range in both the unipolar and bipolar
configurations. In the unipolar configuration
(BP/UP low), the first code transition occurs
0.5 LSB above AGND, and the final code transi-
tion occurs 1.5 LSB’s below VREF. Coding is in
straight binary format. In the bipolar configura-
tion (BP/UP high), the first code transition occurs
0.5 LSB above -VREF and the last transition oc-
curs 1.5 LSB’s below +VREF. Coding is in an
offset-binary format. Positive full scale gives a
digital output of all ones, and negative full scale
gives a digital output of all zeros.
The BP/UP mode pin may be switched after cali-
bration without having to recalibrate the
converter. However, the BP/UP mode should be
changed during the previous conversion cycle,
that is, between HOLD falling and EOC falling.
If BP/UP is changed at any other time, one
dummy conversion cycle must be allowed for
proper acquisition of the input.
Grounding and Power Supply Decoupling
The CS5012A/14/16 use the analog ground con-
nection, AGND, only as a reference voltage. No
dc power currents flow through the AGND con-
nection, and it is completely independent of
DGND. However, any noise riding on the AGND
input relative to the system’s analog ground will
induce conversion errors. Therefore, both the
analog input and reference voltage should be re-
ferred to the AGND pin, which should be used as
the entire system’s analog ground reference point.
The digital and analog supplies to the
CS5012A/14/16 are pinned out separately to
minimize coupling between the analog and digital
sections of the chip. All four supplies should be
decoupled to their respective grounds using
0.1
F ceramic capacitors. If significant low-fre-
quency noise is present on the supplies, 1
F
tantalum capacitors are recommended in parallel
with the 0.1
F capacitors.
Th e p ositive d igital power supply of the
CS5012A/14/16 must never exceed the positive
analog supply by more than a diode drop or the
device could experience permanent damage. If
the two supplies are derived from separate
sources, care must be taken that the analog sup-
ply comes up first at power-up. The system
connection diagram in Figure 36 shows a decou-
pling scheme which allows the CS5012A/14/16
to be powered from a single set of
± 5V rails.
As with any high-precision A/D converter, the
CS5012A/14/16 require careful attention to
grounding and layout arrangements. However, no
unique layout issues must be addressed to prop-
erly apply the device. The CDB5012/14/16
eval uati on
board
i s
avai lable
for
the
CS5012A/14/16, which avoids the need to de-
sign, build, and debug a high-precision PC board
to initially characterize the part. The board comes
with a socketed CS5012A/14/16, and can be
quickly reconfigured to simulate any combination
of sampling, calibration, CLKIN, and analog in-
put range conditions.
CS5012A, CS5014, CS5016
22
DS14F6
相關(guān)PDF資料
PDF描述
5962-8967602QX 1-CH 16-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL/PARALLEL ACCESS, CDIP40
5962-8967602XX 1-CH 16-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL/PARALLEL ACCESS, CQCC44
5962-8967402QX 1-CH 14-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL/PARALLEL ACCESS, CDIP40
5962-8967901XX 1-CH 12-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL/PARALLEL ACCESS, CQCC44
5962-8967402XX 1-CH 14-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL/PARALLEL ACCESS, CQCC44
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