Datasheet

ADS7809
3
SBAS017C
www.ti.com
ELECTRICAL CHARACTERISTICS
At T
A
= –40°C to +85°C, f
S
= 100kHz, V
DIG
= V
ANA
= +5V, using internal reference and fixed resistors (see Figure 4), unless otherwise specified.
ADS7809U ADS7809UB
PARAMETER CONDITIONS MIN TYP MAX MIN TYP MAX UNITS
RESOLUTION 16 ✻ Bits
ANALOG INPUT
Voltage Ranges ±10, 0V to 5V, etc. (See Table I)
Impedance See Table I
Capacitance 35 ✻ pF
THROUGHPUT SPEED
Complete Cycle Acquire and Convert 10 ✻ µs
Throughput Rate 100 ✻ kHz
DC ACCURACY
Integral Linearity Error ±3 ±2 LSB
(1)
Differential Linearity Error +3, –2 ±1LSB
No Missing Codes 15 16 Bits
Transition Noise
(2)
1.3 ✻ LSB
Full-Scale Error
(3,4)
±0.5 ✻ %
Full-Scale Error Drift ±7 ✻ ppm/°C
Full-Scale Error
(3,4)
Ext. 2.5000V Ref ±0.5 ✻ %
Full-Scale Error Drift Ext. 2.5000V Ref ±2 ✻ ppm/°C
Bipolar Zero Error
(3)
Bipolar Ranges ±10 ✻ mV
Bipolar Zero Error Drift Bipolar Ranges ±2 ✻ ppm/°C
Unipolar Zero Error
(3)
0V to 10V Ranges ±5 ✻ mV
Unipolar Zero Error
(3)
0V to 4V, 0V to 5V Ranges ±3 ✻ mV
Unipolar Zero Error Drift Unipolar Ranges ±2 ✻ ppm/°C
Recovery to Rated Accuracy 1µF Capacitor to CAP 1 ✻ ms
after Power-Down
Power-Supply Sensitivity +4.75V < V
D
< +5.25V ±8 ✻ LSB
(V
DIG
= V
ANA
= V
D
)
AC ACCURACY
Spurious-Free Dynamic Range f
IN
= 20kHz 90 100 96 ✻ dB
(5)
Total Harmonic Distortion f
IN
= 20kHz –100 –90 ✻ –94 dB
Signal-to-(Noise + Distortion) f
IN
= 20kHz 83 88 86 ✻ dB
–60dB Input 30 32 dB
Signal-to-Noise f
IN
= 20kHz 83 88 86 ✻ dB
Full-Power Bandwidth
(6)
250 ✻ kHz
SAMPLING DYNAMICS
Aperture Delay 40 ✻ ns
Transient Response FS Step 2 ✻ µs
Overvoltage Recovery
(7)
150 ✻ ns
REFERENCE
Internal Reference Voltage No Load 2.48 2.5 2.52 ✻✻✻ V
Internal Reference Source Current 1 ✻ µA
(Must use external buffer)
External Reference Voltage Range 2.3 2.5 2.7 ✻✻✻ V
For Specified Linearity
External Reference Current Drain Ext. 2.5000V Ref 100 ✻ µA
DIGITAL INPUTS
Logic Levels
V
IL
–0.3 +0.8 ✻✻V
V
IH
(8)
+2.0 V
D
+ 0.3V ✻✻V
I
IL
V
IL
= 0V ±10 ✻ µA
I
IH
V
IH
= 5V ±10 ✻ µA