參數(shù)資料
型號： ADS1259BIPWR
廠商： Texas Instruments
文件頁數(shù)： 8/48頁
文件大小： 0K
描述： IC ADC 24BIT SPI 14KSPS 20TSSOP
標準包裝： 2,000
位數(shù)： 24
采樣率（每秒）： 14k
數(shù)據(jù)接口： 串行，SPI?
轉換器數(shù)目： 1
電壓電源： 模擬和數(shù)字，雙 ±
工作溫度： -40°C ~ 125°C
安裝類型： 表面貼裝
封裝/外殼： 20-TSSOP（0.173"，4.40mm 寬）
供應商設備封裝： 20-TSSOP
包裝： 帶卷 (TR)
輸入數(shù)目和類型： 2 個單端，單極；2 個單端，雙極；1 個差分，單極；1 個差分，雙極
VREFP
AVSS
REFOUT
AVDD
VREFN
ReferenceSelect
EXTREFRegisterBit
(1=SwitchOpenforExternalReference)
ReferenceBias
RBIASRegisterBit
(1=BiasOn)
2.5V
Reference
ADCReferenceInput
(+)
( )
-
1 F
(C
m
REFOUT)
ReferenceOutput
(+)
( )
-
+
2kW
ReferenceInput
(+)
( )
-
1 F
(C
m
REFIN)
+
SBAS424D
– JUNE 2009 – REVISED AUGUST 2011
REFERENCE
the ADC reference input pins, VREFP and VREFN.
(Note that these device pins are not intended to drive
The ADS1259 includes an onboard voltage reference
external
circuits.)
An
external
1
μF
capacitor,
with a low temperature coefficient. The reference
connected from VREFP to VREFN, is recommended
voltage is 2.5V with the capability of sinking and
for noise reduction. The capacitor can be increased
sourcing 10mA via the REFOUT pin. The ADS1259
for increased noise filtering, but the settling time of
can also operate from an external reference. The
the reference may also increase. The settling time
external reference is the default selection. Refer to
should be considered upon activating the internal
Figure 38 for a reference block diagram.
reference.
Internal Reference
See Figure 29 for typical reference settling CREFIN =
1
F. The capacitor dielectric absorption results in
The reference output is provided between pins
increased settling time for RC filter circuits.
REFOUT and AVSS. Because the reference output
return shares the same pin as AVSS, route the
To activate the internal reference, set the register bit
reference
return
trace
and
the
AVSS
trace
RBIAS = 1. This enables the reference bias. Once
independently as Kelvin-connected printed circuit
biased, the internal reference can then be selected as
board (PCB) traces. For stability reasons, connect a
the ADC reference by the register bit EXTREF.
1
μF capacitor between REFOUT and AVSS.
EXTREF = 0 closes the internal switches.
An internal switch connects the internal reference to
Figure 38. Reference Block Diagram
Table 2. Reference Selection for Figure 38
ADS1259 REFERENCE
RBIAS REGISTER BIT
EXTREF REGISTER BIT
Internal
1
0
External
See (1)
1
(1)
If the reference output is not required, set RBIAS = 0. If the reference output is enabled (RBIAS = 1), an external 1
F capacitor must be
used between REFOUT and AVSS.
16
Copyright
2009–2011, Texas Instruments Incorporated
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