Datasheet

ADS8515
www.ti.com SLAS460D –JUNE 2007–REVISED SEPTEMBER 2010
ELECTRICAL CHARACTERISTICS
At T
A
= –40°C to 85°C, f
s
= 250 kHz, V
DIG
= V
ANA
= 5 V, and using internal reference (unless otherwise noted).
ADS8515I ADS8515IB
PARAMETER TEST CONDITIONS UNIT
MIN TYP MAX MIN TYP MAX
Resolution 16 16 Bits
ANALOG INPUT
Voltage range ±10 ±10 V
Impedance 8.885 8.885 kΩ
Capacitance 75 75 pF
THROUGHPUT SPEED
Conversion cycle time Acquire and convert 4 4 ms
Throughput rate 250 250 kHz
DC ACCURACY
INL Integral linearity error –3 3 –2 2 LSB
(1)
DNL Differential linearity error –1 2 –1 1 LSB
(1)
No missing codes 16 16 Bits
Transition noise
(2)
0.67 0.67 LSB
Full-scale error
(3) (4)
Int. Ref. –0.5 0.5 –0.25 0.25 %FSR
Full-scale error drift Int. Ref. ±7 ±7 ppm/°C
Full-scale error
(3) (4)
Ext. 4.096-V Ref. –0.25 0.25 –0.1 0.1 %FSR
Full-scale error drift Ext. 4.096-V Ref. ±2 ±2 ppm/°C
Bipolar zero error
(3)
–4 4 –2 2 mV
Bipolar zero error drift ±2 ±2 ppm/°C
Power supply sensitivity
+4.75 V < V
D
< +5.25 V –8 8 –8 8 LSB
(V
DIG
= V
ANA
= V
D
)
AC ACCURACY
SFDR Spurious-free dynamic range f
I
= 20 kHz 95 102 97 102 dB
(5)
THD Total harmonic distortion f
I
= 20 kHz –100 –94 –100 –96 dB
f
I
= 20 kHz 87 91 89 91 dB
SINAD Signal-to-(noise+distortion)
–60-dB Input 30 32 dB
SNR Signal-to-noise ratio f
I
= 20 kHz 88 92 90 92 dB
Full-power bandwidth
(6)
500 500 kHz
SAMPLING DYNAMICS
Aperture delay 5 5 ns
Transient response FS Step 2 2 ms
Overvoltage recovery
(7)
150 150 ns
REFERENCE
Internal reference voltage 4.076 4.096 4.116 4.076 4.096 4.116 V
Internal reference source current (must
1 1 mA
use external buffer)
Internal reference drift 8 8 ppm/°C
External reference voltage range for
3.9 4.096 4.2 3.9 4.096 4.2 V
specified linearity
External reference current drain Ext. 4.096-V Ref. 100 100 mA
DIGITAL INPUTS
Logic levels
V
IL
Low-level input voltage V
DIG
= 1.65 V – 5.25 V –0.3 0.8 –0.3 0.35*V
DIG
V
V
IH
High-level input voltage V
DIG
= 1.65 V – 5.25 V 0.65*V
DIG
V
DIG
+0.3 V 0.65*V
DIG
V
DIG
+0.3 V V
I
IL
Low-level input current V
IL
= 0 V ±10 ±10 mA
I
IH
High-level input current V
IH
= 5 V ±10 ±10 mA
DIGITAL OUTPUTS
(1) LSB means least significant bit. For the 16-bit, ±10-V input ADS8515, one LSB is 305 mV.
(2) Typical rms noise at worst case transitions and temperatures.
(3) As measured with fixed resistors shown in Figure 22. Adjustable to zero with external potentiometer.
(4) Full-scale error is the worst case of –full-scale or +full-scale 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.
(5) All specifications in dB are referred to a full-scale ±10-V input.
(6) Full-power bandwidth is defined as the full-scale input frequency at which signal-to-(noise + distortion) degrades to 60 dB, or 10 bits of
accuracy.
(7) Recovers to specified performance after 2 x FS input overvoltage.
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