Texas Instruments ADS868 Series, Manual

Page: 8 / 67

ADS8684, ADS8688
SBAS582C – JULY 2014 – REVISED APRIL 2015 www.ti.com
Electrical Characteristics (continued)
Minimum and maximum specifications are at T
A
= –40°C to 125°C. Typical specifications are at T
A
= 25°C.
AVDD = 5 V, DVDD = 3 V, V
REF
= 4.096 V (internal), and f
SAMPLE
= 500 kSPS, unless otherwise noted.
TEST
(1)
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
LEVEL
SYSTEM PERFORMANCE
Resolution 16 Bits A
NMC No missing codes 16 Bits A
DNL Differential nonlinearity –0.99 ±0.5 1.5 LSB
(3)
A
INL Integral nonlinearity
(4)
–2 ±0.75 2 LSB A
E
G
Gain error At T
A
= 25°C, all input ranges ±0.02 ±0.05 %FSR
(5)
A
Gain error matching
At T
A
= 25°C, all input ranges ±0.02 ±0.05 %FSR A
(channel-to-channel)
Gain error temperature drift All input ranges ±1 ±4 ppm/°C B
At T
A
= 25°C,
±0.5 ±0.75 mV A
input range = ±2.5 × V
REF
At T
A
= 25°C,
±0.5 ±1 mV A
input range = ±1.25 × V
REF
At T
A
= 25°C,
E
O
Offset error ±0.5 ±1.5 mV A
input range = ±0.625 × V
REF
At T
A
= 25°C,
±0.5 ±2 mV A
input range = 0 to 2.5 × V
REF
At T
A
= 25°C,
±0.5 ±2 mV A
input range = 0 to 1.25 × V
REF
At T
A
= 25°C,
±0.5 ±0.75 mV A
input range = ±2.5 × V
REF
At T
A
= 25°C,
±0.5 ±1 mV A
input range = ±1.25 × V
REF
Offset error matching At T
A
= 25°C,
±0.5 ±1.5 mV A
(channel-to-channel) input range = ±0.625 × V
REF
At T
A
= 25°C,
±0.5 ±2 mV A
input range = 0 to 2.5 × V
REF
At T
A
= 25°C,
±0.5 ±2 mV A
input range = 0 to 1.25 × V
REF
Offset error temperature drift All input ranges ±1 ±3 ppm/°C B
SAMPLING DYNAMICS
t
CONV
Conversion time 850 ns A
t
ACQ
Acquisition time 1150 ns A
Maximum throughput rate
f
S
500 kSPS A
without latency
(3) LSB = least significant bit.
(4) This parameter is the endpoint INL, not best fit INL.
(5) FSR = full-scale range.
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