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ADS7887 Arkusz danych(PDF) 6 Page - Texas Instruments

Numer części ADS7887
Szczegółowy opis  10-/8-Bit, 1.25-MSPS, MICRO-POWER, MINIATURE SAR ANALOG-TO-DIGITAL CONVERTERS
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Producent  TI1 [Texas Instruments]
Strona internetowa  http://www.ti.com
Logo TI1 - Texas Instruments

ADS7887 Arkusz danych(HTML) 6 Page - Texas Instruments

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ADS7888 SPECIFICATIONS
ADS7887
ADS7888
SLAS468 – JUNE 2005
+V
DD = 2.35 V to 5.25 V, TA = –40°C to 125°C, fsample = 1.25 MHz
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
ANALOG INPUT
Full-scale input voltage span(1)
0
VDD
V
Absolute input voltage range
+IN
–0.20
VDD+0.20
V
Ci
Input capacitance(2)
21
pF
IIlkg
Input leakage current
TA = 125°C
40
nA
SYSTEM PERFORMANCE
Resolution
8
Bits
No missing codes
8
Bits
INL
Integral nonlinearity
–0.3
±0.15
0.3
LSB(3)
DNL
Differential nonlinearity
–0.3
±0.1
0.3
LSB
EO
Offset error(4)(5)(6)
–0.5
±0.15
0.5
LSB
EG
Gain error(5)
–0.5
±0.15
0.5
LSB
SAMPLING DYNAMICS
Conversion time
25-MHz SCLK
450
480
ns
Acquisition time
1.5 MSPS mode, Figure 3
206
ns
Maximum throughput rate
25-MHz SCLK
1.25
MHz
Aperture delay
5
ns
Step Response
160
ns
Overvoltage recovery
160
ns
DYNAMIC CHARACTERISTICS
THD
Total harmonic distortion(7)
100 kHz
–67.5
–65
dB
SINAD
Signal-to-noise and distortion
100 kHz
49
49.5
dB
SFDR
Spurious free dynamic range
100 kHz
65
77
dB
Full power bandwidth
At –3 dB
15
MHz
DIGITAL INPUT/OUTPUT
Logic family — CMOS
VIH
High-level input voltage
VDD = 2.35 V to 5.25 V
VDD–0.4
5.25
V
VDD = 5 V
0.8
VIL
Low-level input voltage
V
VDD = 3 V
0.4
VOH
High-level output voltage
At Isource = 200 µA
VDD–0.2
V
VOL
Low-level output voltage
At Isink = 200 µA
0.4
POWER SUPPLY REQUIREMENTS
+VDD
Supply voltage
2.35
3.3
5.25
V
At VDD = 2.35 V to 5.25 V, 1.25-MHz
2
throughput
Supply current (normal mode)
mA
At VDD = 2.35 V to 5.25 V, static state
1.5
SCLK off
1
Power down state supply current
µA
SCLK on (25 MHz)
200
VDD = 5 V
8
10
Power dissipation at 1.25 MHz
mW
throughput
VDD = 3 V
3.8
6
(1)
Ideal input span; does not include gain or offset error.
(2)
Refer Figure 36 for details on sampling circuit
(3)
LSB means least significant bit
(4)
Measured relative to an ideal full-scale input
(5)
Offset error and gain error ensured by characterization.
(6)
First transition of 000H to 001H at (Vref/28)
(7)
Calculated on the first nine harmonics of the input frequency
6


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