ADS8508 | |
|---|---|
| Manufacturer Part Number | ADS8508 |
| Description | The ADS8508 is a complete 12-bit sampling analog-to-digital (A/D) converter using state-of-the-art CMOS structures |
| Manufacturer | Texas Instruments |
| ADS8508 datasheets |
|
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Specifications of ADS8508 | |||
|---|---|---|---|
| Resolution(bits) | 12 | Sample Rate (max)(sps) | 250kSPS |
| # Input Channels | 1 | Interface | Serial SPI |
| Dnl(max)(+/-lsb) | 0.45 | Inl(max)(+/-lsb) | 0.45 |
| Inl (+/-)(max)(%) | 0.01100 | Snr(db) | 73 |
| Sinad(db) | 73 | Input Range | +4V, 5V, 10V; +/-3.3V, 5V, 10V |
| Power Consumption(typ)(mw) | 70 | Reference Mode | Int , Ext |
| Architecture | SAR | Analog Voltage Av/dd(min)(v) | 4.75 |
| Analog Voltage Av/dd(max)(v) | 5.25 | Digital Supply(min)(v) | 4.75 |
| Digital Supply(max)(v) | 5.25 | Operating Temperature Range(c) | -40 to 85 |
| Pin/package | 20SOIC | Integrated Features | Internal Reference |
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ELECTRICAL CHARACTERISTICS (continued)
At T
= -40°C to 85°C, f
= 250 kHz, V
A
s
Figure
29) (unless otherwise specified)
PARAMETER
±10 V range
Full-scale
(4) (5)
error
All other ranges
Full-scale error drift
±10 V range
Full-scale
(4) (5)
error
All other ranges
Full-scale error drift
(4)
Bipolar zero error
Bipolar zero error drift
10 V range
Unipolar zero
4 V and 5 V
(4)
error
range
Unipolar zero error drift
Recovery to rated accuracy after
power down
Power supply sensitivity
(V
= V
= V
)
DIG
ANA
D
AC ACCURACY
SFDR
Spurious-free dynamic range
THD
Total harmonic distortion
SINAD
Signal-to-(noise+distortion)
SNR
Signal-to-noise ratio
(7)
Full-power bandwidth
SAMPLING DYNAMICS
Aperture delay
Transient response
(8)
Overvoltage recovery
REFERENCE
Internal reference voltage
Internal reference source current
(must use external buffer)
Internal reference drift
External reference voltage range for
specified linearity
External reference current drain
DIGITAL INPUTS
Logic levels
V
Low-level input voltage
IL
V
High-level input voltage
IH
(4) As measured with circuit shown in
Figure 28
0.25-W resistors.
(5) For bipolar input ranges, full-scale error is the worst case of -full-scale or +full-scale uncalibrated deviation from ideal first and last code
transitions, divided by the transition voltage (not divided by the full-scale range) and includes the effect of offset error. For unipolar input
ranges, full-scale error is the deviation of the last code transition divided by the transition voltage. It also includes the effect of offset
error.
(6) All specifications in dB are referred to a full-scale ±10-V input.
(7) Full-power bandwidth is defined as the full-scale input frequency at which signal-to-(noise + distortion) degrades to 60 dB.
(8) Recovers to specified performance after 2 x FS input overvoltage.
= V
= 5 V, using internal reference and fixed resistors (See
DIG
ANA
TEST CONDITIONS
Int. Ref. with 0.1% external fixed
resistors
Int. Ref.
Ext. Ref. with 0.1% external fixed
resistors
Ext. Ref.
1-µF Capacitor to CAP
+4.75 V < V
< +5.25 V
D
f
= 45 kHz
I
f
= 45 kHz
I
f
= 45 kHz
I
–60-dB Input
f
= 45 kHz
I
FS Step
No load
Ext. 2.5-V Ref.
and
Figure
29. Adjustable to zero with external potentiometer. Factory calibrated with 0.1%,
ADS8508
SLAS433 – SEPTEMBER 2005
Figure 28
and
ADS8508IB
UNIT
MIN
TYP
MAX
-0.5
0.5
%FS
-0.5
0.5
±7
ppm/°C
-0.5
0.5
%FS
-0.5
0.5
±2
ppm/°C
-1
1
mV
±0.4
ppm/°C
-5
5
mV
-3
3
±2
ppm/°C
1
ms
-0.5
0.5
LSB
(6)
86
95
dB
-95
-86
dB
72
73
dB
32
dB
72
73
dB
500
kHz
5
ns
2
µs
150
ns
2.48
2.5
2.52
V
1
µA
8
ppm/°C
2.3
2.5
2.7
V
100
µA
-0.3
0.8
V
2.0
V
+0.3 V
V
DIG
3
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