ADS7810
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SBAS014A –MARCH 1992–REVISED SEPTEMBER 2010
ELECTRICAL CHARACTERISTICS
At TA = –40°C to +70°C, fS = 800kHz, +VDIG = +VANA = +5V, –VANA = –5V, using internal reference and the 50Ω input resistor
shown in Figure 16, unless otherwise specified.
ADS7810U
TYP
ADS7819UB(1)
TYP
PARAMETER
TEST CONDITIONS
UNIT
MIN
MAX
MIN
MAX
RESOLUTION
12
12
Bits
ANALOG INPUT
Voltage range
+In – (–In)
±10
3.1
5
±10
3.1
5
V
Impedance
kΩ
pF
Capacitance
THROUGHPUT SPEED
Conversion cycle
Complete cycle
t3 + t4
1020
1020
ns
ns
Acquire and convert
1250
1250
Throughput rate
800
800
kHz
DC ACCURACY
Integral linearity error
Differential linearity error
No missing codes
Transition noise(2)
Full-scale error(3)(4)
Full-scale error drift
Full-scale error(3)(4)
Full-scale error drift
Bipolar zero error(3)
Bipolar zero error drift
±3
±3
±2
±3
LSB
LSB
Ensured
0.1
Ensured
0.1
LSB
%
±1
±1
±8
±0.75
± 1
±12
±12
±2
±12
±12
±2
ppm/°C
%
Ext. 2.5000V Ref
Ext. 2.5000V Ref
ppm/°C
LSB
±4
ppm/°C
LSB
+4.75V < VD < +5.25V
±5
±5
Power-supply sensitivity
(+VDIG = +VANA = VD)
–5.25V < –VANA < –4.75V
±0.5
±0.5
LSB
AC ACCURACY
Spurious-free dynamic range
Total harmonic distortion
Signal-to-(noise+distortion)
Signal-to-noise
fIN = 250kHz
fIN = 250kHz
fIN = 250kHz
fIN = 250kHz
74
82
–80
71
77
84
–82
71
dB(5)
dB
–74
–77
67
66
69
70
dB
71
71
dB
Usable bandwidth(6)
SAMPLING DYNAMICS
Aperture delay
1.5
1.5
MHz
20
10
20
10
ns
ps
ns
ns
Aperture jitter
Transient response
Overvoltage recovery(7)
REFERENCE
Full-scale step
200
250
200
250
Internal reference voltage
2.48
2.5
2.52
2.48
2.5
2.52
V
Internal reference dc source
current
100
100
mA
(external load should be static)
Internal reference drift
8
8
ppm/°C
External reference voltage range
for specified linearity
2.3
2.5
2.7
2.3
2.5
2.7
V
External reference current drain
Ext. 2.5000V Ref
100
100
mA
DIGITAL INPUTS
VIL
–0.3
+2.4
+0.8
VD + 0.3
±10
–0.3
+2.4
+0.8
VD + 0.3
±10
V
V
VIH
Logic levels
IIL
VIL = 0V
VIH = 5V
mA
v
IIH
±10
±10
(1) Shaded cells indicate same specifications as the ADS7810U.
(2) Typical rms noise at worst-case transitions and temperatures.
(3) Measured with 50Ω in series with analog input. Adjustable to zero with external potentiometer.
(4) Full-scale error is the worst case of –Ful-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.
(5) All specifications in dB are referred to a full-scale ±10V input.
(6) Usable bandwidth defined as Full-Scale input frequency at which Signal-to-(Noise+Distortion) degrades to 60dB, or 10 bits of accuracy.
(7) Recovers to specified performance after 2 x FS input over voltage.
Copyright © 1992–2010, Texas Instruments Incorporated
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