ADS8509_14 Datasheet, PDF (3/32 Pages) Texas Instruments – 16-BIT 250-KSPS SERIAL CMOS SAMPLING ANALOG-TO-DIGITAL CONVERTER

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)
PARAMETER
TEST CONDITIONS
Resolution
ANALOG INPUT
Voltage range⁽¹⁾
Impedance ⁽¹⁾
Capacitance
THROUGHPUT SPEED
Conversion cycle
Throughput rate
DC ACCURACY
INL
Integral linearity error
DNL Differential linearity error
No missing codes
Transition noise⁽³⁾
Full-scale
error ^{(4) (5)}
±10-V Range
All other ranges
Full-scale error drift
Full-scale
error^{(4) (5)}
±10-V Range
All other ranges
Full-scale error drift
Bipolar zero error⁽⁴⁾
Bipolar zero error drift
Unipolar zero
error ⁽⁴⁾
10-V Range
4-V and 5-V
Range
Unipolar zero error drift
Recovery to rated accuracy after
power down
Power supply sensitivity
(V_DIG = V_ANA = V_D)
AC ACCURACY
SFDR Spurious-free dynamic range
THD Total harmonic distortion
SINAD
Signal-to-(noise+distortion)
SNR
Signal-to-noise ratio
Full-power bandwidth⁽⁷⁾
SAMPLING DYNAMICS
Aperture delay
Transient response
Overvoltage recovery⁽⁸⁾
Acquire and convert
Int. ref. with 0.1% external fixed
resistors
Int. ref.
Ext. ref. with 0.1% external
fixed resistors
Ext. ref.
1-mF Capacitor to CAP
+4.75 V < V_D < +5.25 V
f_I = 20 kHz
f_I = 20 kHz
f_I = 20 kHz
–60-dB Input
f_I = 20 kHz
FS Step
MIN
250
–3
–2
15
–0.5
–0.5
–0.5
–0.5
–10
–5
–3
–8
90
83
83
ADS8509I
TYP
50
1
±7
±2
±0.4
±2
1
99
–98
88
30
88
500
5
150
ADS8509IB
MAX MIN TYP
16
MAX
16
UNIT
Bits
50
4
250
3 –2
2 –1
16
1
0.5 –0.5
0.5 –0.5
±7
0.5 –0.5
0.5 –0.5
±2
10 –5
±0.4
5 –5
3 –3
±2
1
8 –8
95
99
–90
–98
85
88
32
86
88
500
5
2
150
pF
4
ms
kHz
2 LSB⁽²⁾
1 LSB
Bits
LSB
0.5
%FSR
0.5
ppm/°C
0.5
%FSR
0.5
ppm/°C
5 mV
ppm/°C
5
3
mV
ppm/°C
ms
8
LSB
dB ⁽⁶⁾
–93
dB
dB
dB
dB
kHz
ns
2
ms
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.
Copyright © 2004–2010, Texas Instruments Incorporated
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