ADS8661 Datasheet, PDF (5/71 Pages) Texas Instruments – 12-Bit, High-Speed, Single-Supply, SAR ADC Data Acquisition System with Programmable, Bipolar Input Ranges

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ADS8661, ADS8665
SBAS780 – DECEMBER 2016
6.5 Electrical Characteristics
all 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 = 3.3 V, V_REF = 4.096 V (internal), and maximum throughput (unless otherwise noted)
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX UNIT
ANALOG INPUTS
V_IN
Full-scale input span⁽¹⁾
(AIN_P to AIN_GND)
AIN_P
Operating input range
AIN_GND
Operating input range
Input range = ±3 × V_REF
Input range = ±2.5 × V_REF
Input range = ±1.5 × V_REF
Input range = ±1.25 × V_REF
Input range = ±0.625 × V_REF
Input range = 3 × V_REF
Input range = 2.5 × V_REF
Input range = 1.5 × V_REF
Input range = 1.25 × V_REF
Input range = ±3 × V_REF
Input range = ±2.5 × V_REF
Input range = ±1.5 × V_REF
Input range = ±1.25 × V_REF
Input range = ±0.625 × V_REF
Input range = 3 × V_REF
Input range = 2.5 × V_REF
Input range = 1.5 × V_REF
Input range = 1.25 × V_REF
All input ranges
–12.288
–10.24
–6.144
–5.12
–2.56
0
0
0
0
–12.288
–10.24
–6.144
–5.12
–2.56
0
0
0
0
–0.1
12.288
10.24
6.144
5.12
2.56
V
12.288
10.24
6.144
5.12
12.288
10.24
6.144
5.12
2.56
V
12.288
10.24
6.144
5.12
0
0.1
V
R_IN
Input impedance
Input impedance drift
At T_A = 25°C
Input range = ±3 × V_REF
Input range = ±1.5 × V_REF
Input range = 3 × V_REF
Input range = 1.5 × V_REF
Input range = ±2.5 × V_REF
Input range = ±1.25 × V_REF
Input range = ±0.625 × V_REF
Input range = 2.5 × V_REF
Input range = 1.25 × V_REF
1.02
1.2
1.38
1.02
1.2
1.38
1.02
1.2
1.38
1.02
1.2
1.38
0.85
1
1.15 MΩ
0.85
1
1.15
0.85
1
1.15
0.85
1
1.15
0.85
1
1.15
7
25 ppm/°C
I_IN
Input current
INPUT OVERVOLTAGE PROTECTION CIRCUIT
With voltage
at the AIN_P
pin = V_IN
Input range = ±3 × V_REF
Input range = ±2.5 × V_REF
Input range = ±1.5 × V_REF
Input range = ±1.25 × V_REF
Input range = ±0.625 × V_REF
Input range = 3 × V_REF
Input range = 2.5 × V_REF
Input range = 1.5 × V_REF
Input range = 1.25 × V_REF
(V_IN – 2.5) / R_IN
(V_IN – 2.2) / R_IN
(V_IN – 2.0) / R_IN
(V_IN – 2.0) / R_IN
(V_IN – 1.6) / R_IN
µA
(V_IN – 2.6) / R_IN
(V_IN – 2.5) / R_IN
(V_IN – 2.7) / R_IN
(V_IN – 2.5) / R_IN
V_OVP
All input ranges
AVDD = 5 V or offers low impedance < 30 kΩ,
all input ranges
–20
AVDD = floating with impedance > 30 kΩ,
all input ranges
–11
20
V
11
INPUT BANDWIDTH
f_{–3 dB}
f_{–0.1 dB}
Small-signal Input
bandwidth
–3 dB
–0.1 dB
All input ranges
All input ranges
15
kHz
2.5
(1) Ideal input span, does not include gain or offset error.
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