SBAS686 – JULY 2015
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
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
LEVEL
(1)
DYNAMIC CHARACTERISTICS
Input range = ±2.5 × V
REF
91
93.5
A
Input range = ±1.25 × V
REF
90
92.5
A
Signal-to-noise ratio
SNR
Input range = ±0.625 × V
REF
88
90.5
dB
A
(V
IN
– 0.5 dBFS at 1 kHz)
Input range = 2.5 × V
REF
89.5
92
A
Input range = 1.25 × V
REF
88
90.5
A
Total harmonic distortion
(7)
THD
All input ranges
–105
dB
B
(V
IN
– 0.5 dBFS at 1 kHz)
Input range = ±2.5 × V
REF
90
93.5
A
Input range = ±1.25 × V
REF
89
92.3
A
Signal-to-noise ratio
SINAD
Input range = ±0.625 × V
REF
87.5
90.5
dB
A
(V
IN
– 0.5 dBFS at 1 kHz)
Input range = 2.5 × V
REF
88.5
91.8
A
Input range = 1.25 × V
REF
87.5
90.2
A
Spurious-free dynamic range
SFDR
All input ranges
106
dB
B
(V
IN
– 0.5 dBFS at 1 kHz)
Aggressor channel input overdriven
Crosstalk isolation
(8)
110
dB
B
to 2 × maximum input voltage
Aggressor channel input overdriven
Crosstalk memory
(9)
90
dB
B
to 2 × maximum input voltage
BW
(–3 dB)
Small-signal bandwidth, –3 dB
At T
A
= 25°C, all input ranges
15
kHz
B
BW
(–0.1 dB)
Small-signal bandwidth, –0.1 dB
At T
A
= 25°C, all input ranges
2.5
kHz
B
AUXILIARY CHANNEL
Resolution
16
Bits
A
V
(AUX_IN)
AUX_IN voltage range
(AUX_IN – AUX_GND)
0
V
REF
V
A
AUX_IN
0
V
REF
V
A
Operating input range
AUX_GND
0
V
A
During sampling
75
pF
C
C
i
Input capacitance
During conversion
5
pF
C
I
Ikg(in)
Input leakage current
100
nA
A
DNL
Differential nonlinearity
–0.99
±0.6
1.5
LSB
A
INL
Integral nonlinearity
–4
±1.5
4
LSB
A
E
G(AUX)
Gain error
At T
A
= 25°C
±0.02
±0.2
%FSR
A
E
O(AUX)
Offset error
At T
A
= 25°C
–5
5
mV
A
SNR
Signal-to-noise ratio
V
(AUX_IN)
= –0.5 dBFS at 1 kHz
87
89
dB
A
THD
Total harmonic distortion
(7)
V
(AUX_IN)
= –0.5 dBFS at 1 kHz
–102
dB
B
SINAD
Signal-to-noise + distortion
V
(AUX_IN)
= –0.5 dBFS at 1 kHz
86
88.5
dB
A
SFDR
Spurious-free dynamic range
V
(AUX_IN)
= –0.5 dBFS at 1 kHz
103
dB
B
(7)
Calculated on the first nine harmonics of the input frequency.
(8)
Isolation crosstalk is measured by applying a full-scale sinusoidal signal up to 10 kHz to a channel, not selected in the multiplexing
sequence, and measuring its effect on the output of any selected channel.
(9)
Memory crosstalk is measured by applying a full-scale sinusoidal signal up to 10 kHz to a channel that is selected in the multiplexing
sequence, and measuring its effect on the output of the next selected channel for all combinations of input channels.
8
Copyright © 2015, Texas Instruments Incorporated
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