參數(shù)資料
型號: THS1031CPWLE
廠商: TEXAS INSTRUMENTS INC
元件分類: ADC
英文描述: 10-CH 10-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, PDSO28
封裝: PLASTIC, TSSOP-28
文件頁數(shù): 4/22頁
文件大小: 296K
代理商: THS1031CPWLE
THS1031
COMPLETE SOLUTION 2.7 V ~ 5.5 V, 10-BIT, 30 MSPS
CMOS ANALOG-TO-DIGITAL CONVERTER
SLAS242 – NOVEMBER 1999
12
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
POST OFFICE BOX 1443
HOUSTON, TEXAS 77251–1443
reference operations (continued)
ADC reference
The MODE pin is used to select the reference source for the ADC.
D Internal ADC Reference: Connect the MODE pin to AVDD to use the reference source for ADC generated
on the VREF pin. (See VREF REFERENCE described in Table 2) such that (REFTF–REFBF) = VREF and
(REFTF+REFBF)/2 is set to a voltage for optimum operation of the ADC (near AVDD/2).
D External ADC Reference: To supply an external reference source to the ADC, connect the MODE pin to
AGND. An external reference source should be connected to REFTF/REFTS and REFBF/REFBS.
MODE = AGND closes internal switches to allow a Kelvin connection through REFTS/REFBS, and disables
the on-chip amplifiers which drive on to the ADC references. Differential input is not supported
analog input mode
single-ended input
The single-ended input can be configured to work with either an external ADC reference or internal ADC
reference.
D External ADC Reference Mode: A single-ended analog input is accepted at the AIN pin where the input
signal is bounded by the voltages on the REFTS and REFBS pins. Figure 7 shows an example of applying
external reference to REFTS and REFBS pins in which REFTS is connected to the low-impedance 2-V
source and REFBS is connected to the low-impedance 2-V source. REFTS and REFBS may be driven to
any voltage within the supply as long as the difference (REFTS – REFBS) is between 1 V and 2 V as
specified in Table 2. Figure 8 shows an example of external-reference using a Kelvin connection to eliminate
line voltage drop errors.
SHA
A/D
PGA
SW3
REFBF
REFTF
MODE
REFBS
REFTS
10
F
0.1
F
0.1
F
0.1
F
2 V
1 V
AIN
2 V
1 V
THS1031
Figure 7. External ADC Reference Mode
PRODUCT
PREVIEW
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