ADS8325 Datasheet, PDF (3/36 Pages) Burr-Brown (TI) – 16-Bit, High-Speed, 2.7V to 5.5V microPower Sampling ANALOG-TO-DIGITAL CONVERTER

ADS8325
www.ti.com
SBAS226C – MARCH 2002 – REVISED AUGUST 2007
EQUIVALENT INPUT CIRCUIT
V_DD
ANALOG IN
R_ON
50W
C_(SAMPLE)
40pF
V_DD
REF
GND
Diode Turn-On Voltage: 0.35V
Equivalent Analog Input Circuit
GND
Shut-Down
Switch
5kW
Equivalent Reference
Input Circuit
V_DD
20pF
I/O
GND
Equivalent Digital Input/Output Circuit
RECOMMENDED OPERATING CONDITIONS
Over operating free-air temperature range (unless otherwise noted)
Supply voltage, GND to V_DD
Low-voltage levels
5V logic levels
Reference input voltage
Analog input voltage
–IN
+IN – (–IN)
T_J Operating junction temperature range
MIN
2.7
4.5
2.5
–0.3
0
–40
TYP
5.0
0
MAX
3.6
5.5
V_DD
0.5
V_REF
+125
UNIT
V
V
V
V
V
°C
ELECTRICAL CHARACTERISTICS: V_DD = +5 V
Over recommended operating free-air temperature at –40°C to +85°C, V_REF = 5V, –IN = GND, f_SAMPLE = 100kHz, and f_CLK =
24 × f_SAMPLE, unless otherwise noted.
ADS8325I
ADS8325IB
PARAMETER
TEST CONDITIONS
MIN TYP
MAX
MIN TYP
MAX UNIT
ANALOG INPUT
Full-scale range
FSR +IN – (–IN)
Operating common-mode signal
0
–0.3
V_REF
0.5
0
–0.3
V_REF
V
0.5
V
Input resistance
–IN = GND
5
5
GΩ
Input capacitance
–IN = GND, during sampling
45
45
pF
Input leakage current
–IN = GND
±50
±50
nA
Differential input capacitance
+IN to –IN, during sampling
20
20
pF
Full-power bandwidth
FSBW FS sinewave, SINAD = –3dB
20
20
kHz
DC ACCURACY
Resolution
16
16
Bits
No missing code
NMC
15
16
Bits
Integral linearity error
INL
±3
±6
±1.5
±4
LSB
Offset error
Offset error drift
Gain error
Gain error drift
Noise
V_OS
TCV_OS
G_ERR
TCG_ERR
±0.75
±1.5
±0.2
±24
±3
20
±0.5
±1
mV
±0.2
ppm/°C
±12
LSB
±3
ppm/°C
20
μVRMS
Power-supply rejection
4.75V ≤ V_DD ≤ 5.25V
3
SAMPLING DYNAMICS
3
LSB
Conversion time
Acquisition time
Throughput rate
t_CONV 24kHz < f_CLK ≤ 2.4MHz
t_AQ f_CLK = 2.4MHz
6.667
1.875
666.7
100
6.667
1.875
666.7
100
μs
μs
kSPS
Clock frequency
0.024
2.4
0.024
2.4
MHz
AC ACCURACY
Copyright © 2002–2007, Texas Instruments Incorporated
Product Folder Link(s): ADS8325
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