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ADS8688 bảng dữ liệu(PDF) 6 Page - Texas Instruments

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tên linh kiện ADS8688
Giải thích chi tiết về linh kiện  4- and 8-Channel, Single-Supply, SAR ADCs
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ADS8684A, ADS8688A
SBAS680 – JULY 2015
www.ti.com
7.5 Electrical Characteristics
Minimum and maximum specifications are at TA = –40°C to 125°C. Typical specifications are at TA = 25°C.
AVDD = 5 V, DVDD = 3 V, VREF = 4.096 V (internal), and fSAMPLE = 500 kSPS, unless otherwise noted.
TEST
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
LEVEL(1)
ANALOG INPUTS
Input range = ±2.5 × VREF
–2.5 × VREF
2.5 × VREF
A
Input range = ±1.25 × VREF
–1.25 × VREF
1.25 × VREF
A
Input range = ±0.625 × VREF
–0.625 × VREF
0.625 × VREF
A
–0.3125 ×
Input range = ±0.3125 × VREF
0.3125 × VREF
A
VREF
Full-scale input span(2)
–0.15625 ×
0.15625 ×
V
(AIN_nP to AIN_nGND)
Input range = ±0.15625 × VREF
A
VREF
VREF
Input range = 2.5 × VREF
0
2.5 × VREF
A
Input range = 1.25 × VREF
0
1.25 × VREF
A
Input range = 0.625 × VREF
0
0.625 × VREF
A
Input range = 0.3125 × VREF
0
0.3125 × VREF
A
Input range = ±2.5 × VREF
–2.5 × VREF
2.5 × VREF
A
Input range = ±1.25 × VREF
–1.25 × VREF
1.25 × VREF
A
Input range = ±0.625 × VREF
–0.625 × VREF
0.625 × VREF
A
–0.3125 ×
Input range = ±0.3125 × VREF
0.3125 × VREF
A
VREF
Operating input range,
AIN_nP
–0.15625 ×
0.15625 ×
V
positive input
Input range = ±0.15625 × VREF
A
VREF
VREF
Input range = 2.5 × VREF
0
2.5 × VREF
A
Input range = 1.25 × VREF
0
1.25 × VREF
A
Input range = 0.625 × VREF
0
0.625 × VREF
A
Input range = 0.3125 × VREF
0
0.3125 × VREF
A
Operating input range,
AIN_nGND
All input ranges
–0.1
0
0.1
V
B
negative input
At TA = 25°C,
zi
Input impedance
0.85
1
1.15
M
Ω
B
all input ranges
Input impedance drift
All input ranges
7
25
ppm/°C
B
VIN – 2.25
With voltage at AIN_nP pin = VIN,
————
A
input range = ±2.5 × VREF
RIN
VIN – 2.00
With voltage at AIN_nP pin = VIN,
————
A
input range = ±1.25 × VREF
RIN
With voltage at AIN_nP pin = VIN,
VIN – 1.60
IIkg(in)
Input leakage current
input ranges = ±0.625 × VREF;
————
µA
A
±0.3125 × VREF; ±0.15625 × VREF
RIN
VIN – 2.50
With voltage at AIN_nP pin = VIN,
————
A
input range = 2.5 × VREF
RIN
With voltage at AIN_nP pin = VIN,
VIN – 2.50
input range = 1.25 × VREF; 0.625 ×
————
A
VREF; 0.3125 × VREF
RIN
INPUT OVERVOLTAGE PROTECTION
AVDD = 5 V or offers low
–20
20
B
impedance < 30 k
Ω, all input ranges
VOVP
Overvoltage protection voltage
V
AVDD = floating with impedance
–11
11
B
> 30 k
Ω, all input ranges
(1)
Test Levels: (A) Tested at final test. Over temperature limits are set by characterization and simulation. (B) Limits set by characterization
and simulation, across temperature range. (C) Typical value only for information, provided by design simulation.
(2)
Ideal input span, does not include gain or offset error.
6
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