Datasheet

ADS7815
3
SBAS065B
www.ti.com
RESOLUTION 16 Bits
ANALOG INPUT
Voltage Range ±2.5V V
Impedance 100 MΩ
Capacitance 30 pF
THROUGHPUT SPEED
Conversion Cycle Acquire and Convert 4.0 µs
Throughput Rate 250 kHz
DC ACCURACY
Integral Linearity Error ±4 LSB
(1)
No Missing Codes 15 Bits
Transition Noise
(2)
0.8 LSB
Full Scale Error
(3)
±0.1 %
Full Scale Error Drift ±7 ppm/°C
Bipolar Zero Error ±2mV
Bipolar Zero Error Drift ±2 ppm/°C
Power Supply Sensitivity +V
S
±5%, –V
S
±5% ±6LSB
AC ACCURACY
Spurious-Free Dynamic Range f
IN
= 100kHz 96 100 dB
(4)
Total Harmonic Distortion f
IN
= 100kHz –98 –94 dB
Signal-to-(Noise+Distortion) f
IN
= 100kHz 82 dB
–60dB Input 28 dB
Signal-to-Noise f
IN
= 100kHz 82 dB
Usable Bandwidth
(5)
1MHz
Aperture Delay 40 ns
REFERENCE
Internal Reference Voltage 2.45 2.5 2.55 V
Internal Reference Source Current 1 µA
External Reference Voltage Range 2.3 2.5 2.7 V
External Reference Current Drain V
REF
= +2.5V 100 µA
DIGITAL INPUTS
Logic Levels
V
IL
–0.3 +0.8 V
V
IH
+2.8 +V
S
+0.3V V
I
IL
±10 µA
I
IH
±10 µA
DIGITAL OUTPUTS
Data Format
Data Coding
V
OL
I
SINK
= 1.6mA +0.4 V
V
OH
I
SOURCE
= 200µA+4 V
Leakage Current High-Z State, ±5 µA
V
OUT
= 0V to V
DIG
Output Capacitance High-Z State 15 pF
DIGITAL TIMING
Bus Access Time 83 ns
Bus Relinquish Time 83 ns
POWER SUPPLIES
+V
S
+4.75 +5 +5.25 V
–V
S
–5.25 –5 –4.75 V
+I
S
+30 mA
–I
S
–10 mA
Power Dissipation 200 250 mW
TEMPERATURE RANGE
Specified Performance –25 +85 °C
Storage –55 +125 °C
NOTES: (1) LSB means Least Significant Bit. For the 16-bit, ±2.5V input ADS7815, one LSB is 76µV.
(2) Typical rms noise at worst case transitions and temperatures.
(3) Full scale error is the worst case of –Full Scale or +Full Scale untrimmed 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.
(4) All specifications in dB are referred to a full-scale ±2.5V input.
(5) Full-Power Bandwidth defined as Full-Scale input frequency at which Signal-to-(Noise+Distortion) degrades to 60dB, or 10 bits of accuracy.
ELECTRICAL CHARACTERISTICS
At T
A
= –25°C to +85°C, f
S
= 250kHz, +V
S
= +5V, and –V
S
= –5V, using internal reference, unless otherwise specified.
ADS7815U
PARAMETER CONDITIONS MIN TYP MAX UNITS
Parallel 16 bits
Binary Two’s Complement