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ADS8684A, ADS8688A
SBAS680 – JULY 2015
7.5 Electrical Characteristics
Minimum and maximum specifications are at T
AVDD = 5 V, DVDD = 3 V, V
PARAMETER
ANALOG INPUTS
Full-scale input span
(AIN_nP to AIN_nGND)
Operating input range,
AIN_nP
positive input
Operating input range,
AIN_nGND
negative input
z
Input impedance
i
Input impedance drift
I
Input leakage current
Ikg(in)
INPUT OVERVOLTAGE PROTECTION
V
Overvoltage protection voltage
OVP
(1) Test Levels: (A) Tested at final test. Over temperature limits are set by characterization and simulation. (B) Limits set by characterization
and simulation, across temperature range. (C) Typical value only for information, provided by design simulation.
(2) Ideal input span, does not include gain or offset error.
6
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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 = ±0.3125 × V
(2)
Input range = ±0.15625 × V
Input range = 2.5 × V
Input range = 1.25 × V
Input range = 0.625 × V
Input range = 0.3125 × V
Input range = ±2.5 × V
Input range = ±1.25 × V
Input range = ±0.625 × V
Input range = ±0.3125 × V
Input range = ±0.15625 × V
Input range = 2.5 × V
Input range = 1.25 × V
Input range = 0.625 × V
Input range = 0.3125 × V
All input ranges
At T
= 25°C,
A
all input ranges
All input ranges
With voltage at AIN_nP pin = V
input range = ±2.5 × V
With voltage at AIN_nP pin = V
input range = ±1.25 × V
With voltage at AIN_nP pin = V
input ranges = ±0.625 × V
±0.3125 × V
; ±0.15625 × V
REF
With voltage at AIN_nP pin = V
input range = 2.5 × V
With voltage at AIN_nP pin = V
input range = 1.25 × V
V
; 0.3125 × V
REF
REF
AVDD = 5 V or offers low
impedance < 30 kΩ, all input ranges
AVDD = floating with impedance
> 30 kΩ, all input ranges
Product Folder Links:
= 500 kSPS, unless otherwise noted.
SAMPLE
MIN
–2.5 × V
REF
REF
–1.25 × V
REF
REF
–0.625 × V
REF
REF
–0.3125 ×
REF
V
REF
–0.15625 ×
REF
V
REF
0
REF
0
REF
0
REF
0
REF
–2.5 × V
REF
REF
–1.25 × V
REF
REF
–0.625 × V
REF
REF
–0.3125 ×
REF
V
REF
–0.15625 ×
REF
V
REF
0
REF
0
REF
0
REF
0
REF
–0.1
0.85
,
IN
REF
,
IN
REF
,
IN
;
REF
REF
,
IN
REF
,
IN
; 0.625 ×
REF
–20
–11
ADS8684A ADS8688A
= 25°C.
A
TYP
MAX
UNIT
2.5 × V
REF
1.25 × V
REF
0.625 × V
REF
0.3125 × V
REF
0.15625 ×
V
V
REF
2.5 × V
REF
1.25 × V
REF
0.625 × V
REF
0.3125 × V
REF
2.5 × V
REF
1.25 × V
REF
0.625 × V
REF
0.3125 × V
REF
0.15625 ×
V
V
REF
2.5 × V
REF
1.25 × V
REF
0.625 × V
REF
0.3125 × V
REF
0
0.1
V
1
1.15
MΩ
7
25
ppm/°C
V
– 2.25
IN
————
R
IN
V
– 2.00
IN
————
R
IN
V
– 1.60
IN
————
µA
R
IN
V
– 2.50
IN
————
R
IN
V
– 2.50
IN
————
R
IN
20
V
11
Copyright © 2015, Texas Instruments Incorporated
www.ti.com
TEST
(1)
LEVEL
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
B
B
B
A
A
A
A
A
B
B
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