參數(shù)資料
型號(hào)： THS1031TSSOP
廠商： Texas Instruments, Inc.
英文描述： 2.7 V . 5.5 V, 10-BIT, 30 MSPS CMOS ANALOG-TO-DIGITAL CONVERTER
中文描述： 2.7伏。 5.5五，10位，30 MSPS的CMOS模擬數(shù)字轉(zhuǎn)換器
文件頁(yè)數(shù)： 16/26頁(yè)
文件大小： 358K
代理商： THS1031TSSOP
THS1031
2.7 V – 5.5 V, 10-BIT, 30 MSPS
CMOS ANALOG-TO-DIGITAL CONVERTER
SLAS242A – NOVEMBER 1999 – REVISED JANUARY 2000
16
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
PRINCIPLES OF OPERATION
reference operations (continued)
ADC reference
The MODE pin is used to select the reference source for the ADC.
Internal ADC Reference:
Connect the MODE pin to AV
DD
to use the reference source for ADC generated
on the V
REF
pin. (See V
REF
REFERENCE described in Table 2) such that (REFTF–REFBF) = V
REF
and
(REFTF+REFBF)/2 is set to a voltage for optimum operation of the ADC (near AV
DD
/2).
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.
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 15 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 16 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
μ
F
0.1
μ
F
0.1
μ
F
0.1
μ
F
2 V
1 V
AIN
2 V
1 V
THS1031
Figure 15. External ADC Reference Mode
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