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ADS8694, ADS8698
SBAS686 – JULY 2015
Electrical Characteristics (continued)
Minimum and maximum specifications are at T
AVDD = 5 V, DVDD = 3 V, V
PARAMETER
DYNAMIC CHARACTERISTICS
Signal-to-noise ratio
SNR
(V
– 0.5 dBFS at 1 kHz)
IN
Total harmonic distortion
THD
(V
– 0.5 dBFS at 1 kHz)
IN
Signal-to-noise ratio
SINAD
(V
– 0.5 dBFS at 1 kHz)
IN
Spurious-free dynamic range
SFDR
(V
– 0.5 dBFS at 1 kHz)
IN
Crosstalk isolation
Crosstalk memory
BW
Small-signal bandwidth, –3 dB
(–3 dB)
BW
Small-signal bandwidth, –0.1 dB
(–0.1 dB)
AUXILIARY CHANNEL
Resolution
V
AUX_IN voltage range
(AUX_IN)
Operating input range
C
Input capacitance
i
I
Input leakage current
Ikg(in)
DNL
Differential nonlinearity
INL
Integral nonlinearity
E
Gain error
G(AUX)
E
Offset error
O(AUX)
SNR
Signal-to-noise ratio
THD
Total harmonic distortion
SINAD
Signal-to-noise + distortion
SFDR
Spurious-free dynamic range
(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
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= –40°C to 125°C. Typical specifications are at T
A
= 4.096 V (internal), and f
REF
TEST CONDITIONS
Input range = ±2.5 × V
Input range = ±1.25 × V
Input range = ±0.625 × V
Input range = 2.5 × V
Input range = 1.25 × V
(7)
All input ranges
Input range = ±2.5 × V
Input range = ±1.25 × V
Input range = ±0.625 × V
Input range = 2.5 × V
Input range = 1.25 × V
All input ranges
Aggressor channel input overdriven
(8)
to 2 × maximum input voltage
Aggressor channel input overdriven
(9)
to 2 × maximum input voltage
At T
= 25°C, all input ranges
A
At T
= 25°C, all input ranges
A
(AUX_IN – AUX_GND)
AUX_IN
AUX_GND
During sampling
During conversion
At T
= 25°C
A
At T
= 25°C
A
V
= –0.5 dBFS at 1 kHz
(AUX_IN)
(7)
V
= –0.5 dBFS at 1 kHz
(AUX_IN)
V
= –0.5 dBFS at 1 kHz
(AUX_IN)
V
= –0.5 dBFS at 1 kHz
(AUX_IN)
Product Folder Links:
= 500 kSPS, unless otherwise noted.
SAMPLE
MIN
91
REF
90
REF
88
REF
89.5
REF
88
REF
90
REF
89
REF
87.5
REF
88.5
REF
87.5
REF
16
0
0
–0.99
–4
–5
87
86
ADS8694 ADS8698
= 25°C.
A
TYP
MAX
UNIT
93.5
92.5
90.5
dB
92
90.5
–105
dB
93.5
92.3
90.5
dB
91.8
90.2
106
dB
110
dB
90
dB
15
kHz
2.5
kHz
Bits
V
V
REF
V
V
REF
0
V
75
pF
5
pF
100
nA
±0.6
1.5
LSB
±1.5
4
LSB
±0.02
±0.2
%FSR
5
mV
89
dB
–102
dB
88.5
dB
103
dB
Copyright © 2015, Texas Instruments Incorporated
www.ti.com
TEST
(1)
LEVEL
A
A
A
A
A
B
A
A
A
A
A
B
B
B
B
B
A
A
A
A
C
C
A
A
A
A
A
A
B
A
B
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