Datasheet

ADS8509
www.ti.com SLAS324C –OCTOBER 2004–REVISED APRIL 2010
ELECTRICAL CHARACTERISTICS
At T
A
= –40°C to 85°C, f
s
= 250 kHz, V
DIG
= V
ANA
= 5 V, using internal reference and 0.1%, 0.25-W fixed resistors (see
Figure 29 and Figure 30) (unless otherwise specified)
ADS8509I ADS8509IB
PARAMETER TEST CONDITIONS UNIT
MIN TYP MAX MIN TYP MAX
Resolution 16 16 Bits
ANALOG INPUT
Voltage range
(1)
Impedance
(1)
Capacitance 50 50 pF
THROUGHPUT SPEED
Conversion cycle Acquire and convert 4 4 ms
Throughput rate 250 250 kHz
DC ACCURACY
INL Integral linearity error –3 3 –2 2 LSB
(2)
DNL Differential linearity error –2 2 –1 1 LSB
No missing codes 15 16 Bits
Transition noise
(3)
1 1 LSB
±10-V Range Int. ref. with 0.1% external fixed –0.5 0.5 –0.5 0.5
Full-scale
%FSR
resistors
error
(4) (5)
All other ranges –0.5 0.5 –0.5 0.5
Full-scale error drift Int. ref. ±7 ±7 ppm/°C
±10-V Range Ext. ref. with 0.1% external –0.5 0.5 –0.5 0.5
Full-scale
%FSR
fixed resistors
error
(4) (5)
All other ranges –0.5 0.5 –0.5 0.5
Full-scale error drift Ext. ref. ±2 ±2 ppm/°C
Bipolar zero error
(4)
–10 10 –5 5 mV
Bipolar zero error drift ±0.4 ±0.4 ppm/°C
10-V Range –5 5 –5 5
Unipolar zero
mV
4-V and 5-V –3 3 –3 3
error
(4)
Range
Unipolar zero error drift ±2 ±2 ppm/°C
Recovery to rated accuracy after 1-mF Capacitor to CAP 1 1 ms
power down
Power supply sensitivity –8 8 –8 8
+4.75 V < V
D
< +5.25 V LSB
(V
DIG
= V
ANA
= V
D
)
AC ACCURACY
SFDR Spurious-free dynamic range f
I
= 20 kHz 90 99 95 99 dB
(6)
THD Total harmonic distortion f
I
= 20 kHz –98 –90 –98 –93 dB
SINAD f
I
= 20 kHz 83 88 85 88 dB
Signal-to-(noise+distortion)
–60-dB Input 30 32 dB
SNR Signal-to-noise ratio f
I
= 20 kHz 83 88 86 88 dB
Full-power bandwidth
(7)
500 500 kHz
SAMPLING DYNAMICS
Aperture delay 5 5 ns
Transient response FS Step 2 2 ms
Overvoltage recovery
(8)
150 150 ns
(1) ±10 V, 0 V to 5 V, etc. (see Table 2). For normal operation, the analog input should not exceed configured range ±20%.
(2) LSB means least significant bit. For the ±10-V input range, one LSB is 305 mV.
(3) Typical rms noise at worst case transitions and temperatures.
(4) As measured with fixed resistors shown in Figure 29 and Figure 30. Adjustable to zero with external potentiometer. Factory calibrated
with 0.1%, 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.
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